i2c test and display

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "fw/ch32fun"]
+	path = fw/ch32fun
+	url = https://github.com/cnlohr/ch32fun
+[submodule "fw/u8g2"]
+	path = fw/u8g2
+	url = https://github.com/olikraus/u8g2

README.md

@@ -2,4 +2,14 @@
 
 Repo for a cool usb-c soldering iron that uses C245 cartridges and power up to 130W.
 
-Read the [project report](doc/report/README.md) (in italian).
+Read the [project report](doc/report/README.md) (in italian).
+
+# IDEAS
+
+* USB-C connector on the edge of the PCB like the [alientek T90B](https://youtu.be/Xl0IKpvlF3Y?si=ecKIGLwI0vSPZbJ4&t=7) (clamping plate)
+* OLED Screen on a separate PCB, same project with a V-Cut
+* More compact tip recess, stabilized by a, aluminium ring, maybe bought at the hardware store
+* Single screw disassembly
+* 13mm grip dimensions and 18mm otherwise
+* 1mm walls in PETG
+* Add a ~small~ button to the bootsel line

fw/.gitignore

@@ -0,0 +1,10 @@
+.zen
+.vscode
+.ccls-cache
+.cache
+*.bin
+*.lst
+*.map
+*.elf
+*.hex
+compile_commands.json

fw/Makefile

@@ -0,0 +1,26 @@
+all : build
+
+TARGET := main
+TARGET_MCU := CH32X035
+TARGET_MCU_PACKAGE := CH32X035F8U6
+
+# include u8g2
+U8G2_DIR:=u8g2/csrc
+# U8G2_SRC:=u8g2/csrc/u8x8_d_ssd1312.c $(filter-out $(U8G2_DIR)/u8x8_d_%.c, $(wildcard $(U8G2_DIR)/*.c))
+U8G2_SRC:=u8g2/csrc/u8x8_d_ssd1306_128x32.c $(filter-out $(U8G2_DIR)/u8x8_d_%.c, $(wildcard $(U8G2_DIR)/*.c))
+
+EXTRA_CFLAGS += -I$(U8G2_DIR)
+
+ADDITIONAL_C_FILES += $(U8G2_SRC)
+ADDITIONAL_C_FILES += lib_i2c.c
+ADDITIONAL_C_FILES += display.c
+
+include ch32fun/ch32fun/ch32fun.mk
+
+FLASH_COMMAND=$(MINICHLINK)/minichlink -C isp -w $< $(WRITE_SECTION) -b
+
+flash : cv_flash
+clean : cv_clean
+
+monitor :
+	picocom --imap lfcrlf /dev/ttyACM0

fw/ch32fun

@@ -0,0 +1 @@
+Subproject commit cfffff6d6bd9bd97d7348d044a1de145f4548072

fw/display.c

@@ -0,0 +1,174 @@
+#include <u8g2.h>
+#include <ch32fun.h>
+#include <stdio.h>
+
+#include "display.h"
+#include "lib_i2c.h"
+
+
+/*
+ * GPIO and delay callback for u8g2/u8x8 display driver
+ */
+
+
+static u8g2_t u8g2;
+
+
+uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
+{
+	switch(msg) {
+	case U8X8_MSG_GPIO_AND_DELAY_INIT:
+		// called once during init phase of u8g2/u8x8
+		// can be used to setup pins
+		printf("TODO: U8X8_MSG_GPIO_AND_DELAY_INIT\n");
+		break;
+	case U8X8_MSG_DELAY_NANO:
+		// delay arg_int * 1 nano second
+		// at 48MHz 1 cycle = 20ns, 1 nop = 1 cycle
+		// the for lopp takes about 2 cycles per iteration
+		for (int i = 0; i < (arg_int/(20*3)); i++) {
+			asm("nop");
+		}
+		break;
+	case U8X8_MSG_DELAY_100NANO:
+		// delay arg_int * 100 nano seconds
+		// at 48MHz 1 cycle = 20ns, 1 nop = 1 cycle
+		// the for lopp takes about 2 cycles per iteration
+		for (int i = 0; i < ((arg_int*100)/(20*3)); i++) {
+			asm("nop");
+		}
+		break;
+	case U8X8_MSG_DELAY_10MICRO:
+		// delay arg_int * 10 micro seconds
+		Delay_Us(arg_int*10);
+		break;
+	case U8X8_MSG_DELAY_MILLI:
+		// delay arg_int * 1 milli second
+		Delay_Ms(arg_int);
+		break;
+	case U8X8_MSG_DELAY_I2C:
+		// arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
+		// arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
+		printf("TODO: U8X8_MSG_DELAY_I2C\n");
+		break;
+	case U8X8_MSG_GPIO_D0:
+		// D0 or SPI clock pin: Output level in arg_int
+	//case U8X8_MSG_GPIO_SPI_CLOCK:
+		break;
+	case U8X8_MSG_GPIO_D1:
+		// D1 or SPI data pin: Output level in arg_int
+	//case U8X8_MSG_GPIO_SPI_DATA:
+		break;
+	case U8X8_MSG_GPIO_D2:
+		// D2 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_D3:
+		// D3 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_D4:
+		// D4 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_D5:
+		// D5 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_D6:
+		// D6 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_D7:
+		// D7 pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_E:
+		// E/WR pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_CS:
+		// CS (chip select) pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_DC:
+		// DC (data/cmd, A0, register select) pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_RESET:
+		funDigitalWrite(PIN_DISP_RST, arg_int);
+		// Reset pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_CS1:
+		// CS1 (chip select) pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_CS2:
+		// CS2 (chip select) pin: Output level in arg_int
+		break;
+	case U8X8_MSG_GPIO_I2C_CLOCK:
+		// arg_int=0: Output low at I2C clock pin
+		// arg_int=1: Input dir with pullup high for I2C clock pin
+		break;
+	case U8X8_MSG_GPIO_I2C_DATA:
+		// arg_int=0: Output low at I2C data pin
+		// arg_int=1: Input dir with pullup high for I2C data pin
+		break;
+	case U8X8_MSG_GPIO_MENU_SELECT:
+		// get menu select pin state
+		u8x8_SetGPIOResult(u8x8, 0);
+		break;
+	case U8X8_MSG_GPIO_MENU_NEXT:
+		// get menu next pin state
+		u8x8_SetGPIOResult(u8x8, 0);
+		break;
+	case U8X8_MSG_GPIO_MENU_PREV:
+		// get menu prev pin state
+		u8x8_SetGPIOResult(u8x8, 0);
+		break;
+	case U8X8_MSG_GPIO_MENU_HOME:
+		// get menu home pin state
+		u8x8_SetGPIOResult(u8x8, 0);
+		break;
+	default:
+		// default return value
+		u8x8_SetGPIOResult(u8x8, 1);
+		break;
+	}
+	return 1;
+}
+
+
+uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
+{
+	static uint8_t buffer[32];
+	static uint8_t buffer_idx;
+	uint8_t *data;
+
+	switch(msg) {
+	case U8X8_MSG_BYTE_INIT:
+		break;
+	case U8X8_MSG_BYTE_SEND:
+		data = (uint8_t*)arg_ptr;
+		while (arg_int > 0) {
+			buffer[buffer_idx++] = *data;
+			data++;
+			arg_int--;
+		}
+		break;
+	case U8X8_MSG_BYTE_START_TRANSFER:
+		buffer_idx = 0;
+		break;
+	case U8X8_MSG_BYTE_END_TRANSFER:
+		i2c_sendBytes(I2C_TARGET, u8x8_GetI2CAddress(u8x8) >> 1, buffer, buffer_idx);
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+
+u8g2_t* display_init(void)
+{
+#if SSD1306_128X32 && SSD1306_128X32 == 1
+ 	u8g2_Setup_ssd1306_i2c_128x32_univision_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay);
+#elif SSD1312_96X16 && SSD1312_96X16 == 1
+	// NOTE: display size is wrong, hardware is 96x16, but driver is configured for 120x28
+	u8g2_Setup_ssd1312_i2c_120x28_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay);
+#endif
+	// TODO: log errors and return NULL on failure
+    u8g2_InitDisplay(&u8g2);
+    u8g2_SetPowerSave(&u8g2, 0);
+    return &u8g2;
+}

fw/display.h

@@ -0,0 +1,12 @@
+#ifndef _DISPLAY_H
+#define _DISPLAY_H
+
+#include <u8g2.h>
+
+#define SSD1306_128X32 1
+// #define SSD1312_96X16 1
+#define PIN_DISP_RST PA7  // display reset
+
+u8g2_t* display_init(void);
+
+#endif // _DISPLAY_H

fw/funconfig.h

@@ -0,0 +1,11 @@
+#ifndef _FUNCONFIG_H
+#define _FUNCONFIG_H
+
+#define FUNCONF_USE_DEBUGPRINTF     0 // can only have one printf
+#define FUNCONF_USE_USBPRINTF       1
+#define FUNCONF_DEBUG_HARDFAULT     0
+#define CH32X035                    1
+#define I2C_TARGET                  I2C1
+
+
+#endif // _FUNCONFIG_H

fw/lib_i2c.c

@@ -0,0 +1,232 @@
+// MIT License
+// Copyright (c) 2025 UniTheCat
+// Tested with Ch32X03x and CH32V30x
+
+#include "lib_i2c.h"
+
+#define I2C_DEFAULT_TIMEOUT 100000
+
+//! ####################################
+//! I2C INIT FUNCTIONS
+//! ####################################
+
+void i2c_init(I2C_TypeDef* I2Cx, u32 PCLK, u32 i2cSpeed_Hz) {
+	// Enable I2C clock
+	if (I2Cx == I2C1) {
+		RCC->APB1PCENR |= RCC_APB1Periph_I2C1;
+	}
+	#ifdef I2C2
+	else if (I2Cx == I2C2) {
+		RCC->APB1PCENR |= RCC_APB1Periph_I2C2;
+	}
+	#endif
+
+	// Disable I2C before configuration
+	I2Cx->CTLR1 &= ~I2C_CTLR1_PE;
+
+	// configure I2C clock
+	I2Cx->CTLR2 = (PCLK / 1000000);
+	I2Cx->CKCFGR = PCLK / (i2cSpeed_Hz << 1);	// PeripheralClock / (100KHz * 2)
+
+	// Enable I2C
+	I2Cx->CTLR1 |= I2C_CTLR1_PE;
+
+	// Enable ACK
+	I2Cx->CTLR1 |= I2C_CTLR1_ACK;
+}
+
+u8 i2c_start(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 isRead) {
+	//# Wait while BUSY, when BUSY is set to 0 then continue
+	u32 timeout = I2C_DEFAULT_TIMEOUT;
+	while((I2Cx->STAR2 & I2C_STAR2_BUSY) && --timeout);
+	// if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x11; }
+
+	//# Generate START condition
+	I2Cx->CTLR1 |= I2C_CTLR1_START;
+
+	//# Wait while SB is 0, when SB is set to 1 then continue
+	timeout = I2C_DEFAULT_TIMEOUT;
+	while(!(I2Cx->STAR1 & I2C_STAR1_SB) && --timeout);
+	if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x12; }
+	// printf("timeoutB: %d\n", I2C_DEFAULT_TIMEOUT - timeout);
+
+	//# Send address + read/write. Write = 0, Read = 1
+	I2Cx->DATAR = (i2cAddress << 1) | isRead;
+
+	//# Wait while ADDR is 0, if ADDR is set to 1 then continue
+	timeout = I2C_DEFAULT_TIMEOUT;
+	while(!(I2Cx->STAR1 & I2C_STAR1_ADDR) && --timeout);
+	if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x13; }
+	// printf("timeoutC: %d\n", I2C_DEFAULT_TIMEOUT - timeout);
+
+	//! REQUIRED. Clear ADDR by reading STAR1 then STAR2
+	(void)I2Cx->STAR1;
+	(void)I2Cx->STAR2;
+	return 0;
+}
+
+void i2c_stop(I2C_TypeDef* I2Cx)
+{
+	//# Generate STOP condition
+	I2Cx->CTLR1 |= I2C_CTLR1_STOP;
+}
+
+void i2c_scan(I2C_TypeDef* I2Cx, void (*onPingFound)(u8 address)) {
+	// mininum 0x08 to 0x77 (0b1110111)
+	for (int i = 0x08; i < 0x77; i++) {
+		u8 ping = i2c_start(I2Cx, i, 1);
+
+		//# Generate STOP condition
+		I2Cx->CTLR1 |= I2C_CTLR1_STOP;
+		if (ping == 0) onPingFound(i);
+	}
+}
+
+//! ####################################
+//! I2C SEND FUNCTION
+//! ####################################
+
+u8 i2c_sendBytes_noStop(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len) {
+	u8 err = i2c_start(I2Cx, i2cAddress, 0); // Write mode
+	if (err) return err;
+	u32 timeout;
+
+	for(u8 i = 0; i < len; i++) {
+		//# Wait for register empty
+		timeout = I2C_DEFAULT_TIMEOUT;
+		while(!(I2Cx->STAR1 & I2C_STAR1_TXE) && --timeout);
+		if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x21; }
+		I2Cx->DATAR = buffer[i];		// Send data
+	}
+
+	//# Wait for transmission complete. Wait while BTF is 0, when set to 1 continue
+	timeout = I2C_DEFAULT_TIMEOUT;
+	while(!(I2Cx->STAR1 & I2C_STAR1_BTF) && --timeout);
+	if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x22; }
+
+	return 0;
+}
+
+u8 i2c_sendBytes(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len) {
+	u8 err = i2c_sendBytes_noStop(I2Cx, i2cAddress, buffer, len);
+	//# Generate STOP condition
+	I2Cx->CTLR1 |= I2C_CTLR1_STOP;
+	return err;
+}
+
+u8 i2c_sendByte(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 data) {
+	return i2c_sendBytes(I2Cx, i2cAddress, &data, 1);
+}
+
+
+//! ####################################
+//! I2C RECEIVE FUNCTIONS
+//! ####################################
+
+u8 i2c_readBytes(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len) {
+	u8 err = i2c_start(I2Cx, i2cAddress, 1); // Read mode
+	if (err) return err;
+
+	//# Enable ACK at the beginning
+	I2Cx->CTLR1 |= I2C_CTLR1_ACK;
+
+	for(u8 i = 0; i < len; i++) {
+		//# Before reading the last bytes, disable ACK to signal the slave to stop sending
+		if(i == len-1) I2Cx->CTLR1 &= ~I2C_CTLR1_ACK;
+
+		//# Wait for data. Wait while RxNE is 0, when set to 1 continue
+		u32 timeout = I2C_DEFAULT_TIMEOUT;
+		while(!(I2Cx->STAR1 & I2C_STAR1_RXNE) && --timeout);
+		if (timeout == 0) { I2Cx->CTLR1 |= I2C_CTLR1_STOP; return 0x31; }
+
+		//# Read data
+		buffer[i] = I2Cx->DATAR;
+	}
+
+	//# Generate STOP condition
+	I2Cx->CTLR1 |= I2C_CTLR1_STOP;
+	return 0;
+}
+
+// Write to register and then do read data, no stop inbetween
+u8 i2c_readRegTx_buffer(I2C_TypeDef* I2Cx, u8 i2cAddress,
+						u8 *tx_buf, u8 tx_len, u8 *rx_buf, u8 rx_len
+) {
+	u8 err = i2c_sendBytes_noStop(I2Cx, i2cAddress, tx_buf, tx_len);	// Send register address
+	if (err) return err;
+	err = i2c_readBytes(I2Cx, i2cAddress, rx_buf, rx_len); 	// Read data
+	return err;
+}
+
+
+//! ####################################
+//! I2C SLAVE FUNCTIONS
+//! ####################################
+
+void i2c_slave_init(I2C_TypeDef* I2Cx, u16 self_addr, u32 PCLK, u32 i2cSpeed_Hz) {
+	i2c_init(I2Cx, PCLK, i2cSpeed_Hz);
+
+	// Configure the CH32 I2C slave address to make it an I2C slave
+	I2Cx->OADDR1  = (self_addr << 1);
+	I2Cx->OADDR2 = 0;
+
+	I2Cx->CTLR2 |= I2C_CTLR2_ITEVTEN | I2C_CTLR2_ITERREN | I2C_CTLR2_ITBUFEN;
+
+	// Enable Event and Error Interrupts
+	if (I2Cx == I2C1) {
+		NVIC_EnableIRQ(I2C1_EV_IRQn); // I2C Event interrupt
+		NVIC_EnableIRQ(I2C1_ER_IRQn); // I2C Error interrupt
+	}
+
+	#ifdef I2C2
+		else if (I2Cx == I2C2) {
+			NVIC_EnableIRQ(I2C2_EV_IRQn); // I2C Event interrupt
+			NVIC_EnableIRQ(I2C2_ER_IRQn); // I2C Error interrupt
+		}
+	#endif
+}
+
+void I2C1_ER_IRQHandler(void) __attribute__((interrupt));
+void I2C1_ER_IRQHandler(void) {
+	// get I2C status
+	uint16_t STAR1 = I2C1->STAR1;
+
+	// Obtain and clear Bus error
+	if (STAR1 & I2C_STAR1_BERR) {
+		I2C1->STAR1 &= ~(I2C_STAR1_BERR);
+	}
+
+	// Obtain and clear Arbitration lost error
+	if (STAR1 & I2C_STAR1_ARLO) {
+		I2C1->STAR1 &= ~(I2C_STAR1_ARLO);
+	}
+
+	// Obtain and clear Acknowledge failure error
+	if (STAR1 & I2C_STAR1_AF) {
+		I2C1->STAR1 &= ~(I2C_STAR1_AF);
+	}
+}
+
+
+#ifdef I2C2
+	void I2C2_ER_IRQHandler(void) __attribute__((interrupt));
+	void I2C2_ER_IRQHandler(void) {
+		// get I2C status
+		uint16_t STAR1 = I2C2->STAR1;
+
+		// Obtain and clear Bus error
+		if (STAR1 & I2C_STAR1_BERR) {
+			I2C2->STAR1 &= ~(I2C_STAR1_BERR);
+		}
+
+		// Obtain and clear Arbitration lost error
+		if (STAR1 & I2C_STAR1_ARLO) {
+			I2C2->STAR1 &= ~(I2C_STAR1_ARLO);
+		}
+
+		// Obtain and clear Acknowledge failure error
+		if (STAR1 & I2C_STAR1_AF) {
+			I2C2->STAR1 &= ~(I2C_STAR1_AF);
+		}
+	}
+#endif

fw/lib_i2c.h

@@ -0,0 +1,53 @@
+#ifndef _LIB_I2C_H
+#define _LIB_I2C_H
+
+// MIT License
+// Copyright (c) 2025 UniTheCat
+// Tested with Ch32X03x and CH32V30x
+
+#include <ch32fun.h>
+
+
+#define I2C_DEFAULT_TIMEOUT 100000
+
+//! ####################################
+//! I2C INIT FUNCTIONS
+//! ####################################
+
+void i2c_init(I2C_TypeDef* I2Cx, u32 PCLK, u32 i2cSpeed_Hz);
+u8 i2c_start(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 isRead);
+void i2c_stop(I2C_TypeDef* I2Cx);
+u8 i2c_write(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 reg, u8 data);
+u8 i2c_read(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 reg, u8* buffer, u8 len);
+void i2c_scan(I2C_TypeDef* I2Cx, void (*onPingFound)(u8 address));
+
+//! ####################################
+//! I2C SEND FUNCTION
+//! ####################################
+
+u8 i2c_sendBytes_noStop(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len);
+u8 i2c_sendBytes(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len);
+u8 i2c_sendByte(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 data);
+
+//! ####################################
+//! I2C RECEIVE FUNCTIONS
+//! ####################################
+
+u8 i2c_readBytes(I2C_TypeDef* I2Cx, u8 i2cAddress, u8* buffer, u8 len);
+u8 i2c_readByte(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 reg, u8* buffer);
+
+// Write to register and then do read data, no stop inbetween
+u8 i2c_readRegTx_buffer(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 *tx_buf, u8 tx_len, u8 *rx_buf, u8 rx_len);
+inline u8 i2c_readReg_buffer(I2C_TypeDef* I2Cx, u8 i2cAddress, u8 reg, u8 *rx_buf, u8 rx_len)
+{
+	return i2c_readRegTx_buffer(I2Cx, i2cAddress, &reg, 1, rx_buf, rx_len);
+}
+
+//! ####################################
+//! I2C SLAVE FUNCTIONS
+//! ####################################
+
+void i2c_slave_init(I2C_TypeDef* I2Cx, u16 self_addr, u32 PCLK, u32 i2cSpeed_Hz);
+
+
+#endif // _LIB_I2C_H

fw/main.c

@@ -0,0 +1,216 @@
+#include <ch32fun.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <fsusb.h>
+
+#include "lib_i2c.h"
+#include "display.h"
+
+
+// Pin definitions
+#define PIN_LED      PA4  // debug led
+#define PIN_VBUS     PA0  // vbus voltage feedback
+#define PIN_CURRENT  PA1  // current feedback
+#define PIN_NTC      PA2  // ntc temperature sensor
+#define PIN_TEMP     PA3  // thermocouple amplifier
+#define PIN_12V      PA5  // 12V regulator enable
+#define PIN_HEATER   PA6  // power mosfet gate control
+#define PIN_ENC_A    PB3  // rotary encoder A
+#define PIN_ENC_B    PB11 // rotary encoder B
+#define PIN_BTN      PB1  // rotary encoder button
+
+// Analog channel definitions
+#define VBUS_ADC_CHANNEL    ANALOG_0 // PA0
+#define CURRENT_ADC_CHANNEL ANALOG_1 // PA1
+#define NTC_ADC_CHANNEL     ANALOG_2 // PA2
+#define TEMP_ADC_CHANNEL    ANALOG_3 // PA3
+
+// constants
+// LUT for converting NTC readings to degrees kelvin
+// Nominal: 1kOhm, Beta: 3380, Step: 64
+// TODO: Since the board temperature is almost always in the 300-200K range add
+// more steps in order to better represent that interval
+const uint8_t ntc_step_size = 64;
+const int16_t ntc_table[64] = {
+    1180, 197, 155, 133, 119, 108, 100, 93, 87, 82, 77, 73, 69, 66, 63, 60, 57, 54, 52, 50, 47, 45, 43, 41, 39, 37, 35, 34, 32, 30, 28, 27, 25, 23, 22, 20, 19, 17, 15, 14, 12, 11, 9, 7, 6, 4, 2, 0, -1, -3, -5, -7, -9, -11, -14, -16, -19, -22, -25, -28, -33, -38, -44, -55
+};
+
+
+u8g2_t *u8g2;
+uint8_t pin = 0;
+int16_t encoder = 0; // rotary encoder counter
+uint32_t last_interrupt = 0; // last time the encoder interrupt was triggered
+#define ENCODER_DEBOUNCE 6000
+
+
+// Convert the raw adc reading to a temperature in kelvin with the ntc lut,
+// linearly interpolating between positions
+static inline int16_t get_temp_k(uint16_t adc_reading)
+{
+	if (adc_reading > 4095) return 0;
+	uint8_t index = adc_reading / ntc_step_size;
+	uint8_t remainder = adc_reading % ntc_step_size;
+	int16_t temp_base = index < 64 ? ntc_table[index] : 0;
+    int16_t temp_next = index < 63 ? ntc_table[index + 1] : temp_base;
+    return temp_base + ((temp_next - temp_base) * remainder)/ntc_step_size;
+}
+
+
+// convert the raw tip reading from the adc to a temperature in kelvin
+static inline int16_t get_tip_temp_k(uint16_t adc_reading, int16_t cold_temp_k)
+{
+	return 0;
+}
+
+
+void print_i2c_device(uint8_t addr)
+{
+	printf("Device found at 0x%02X\n", addr);
+}
+
+
+// this callback is mandatory when FUNCONF_USE_USBPRINTF is defined,
+// can be empty though
+void handle_usbfs_input(int numbytes, uint8_t *data)
+{
+	// handle single character commands
+	// TODO:
+	//     - 'c' to calibrate the tip temperature
+	//     - 't' to test tip presence
+	if(numbytes == 1) {
+		switch(data[0]) {
+		case 'r': // toggle the 12V regulator
+			if (funDigitalRead(PIN_12V)) {
+				funDigitalWrite(PIN_12V, 0);
+				printf("Disabled 12V Regulator\n");
+			} else {
+				funDigitalWrite(PIN_12V, 1);
+				printf("Enabled 12V Regulator\n");
+			}
+			break;
+		case 'h':
+			printf(
+				"Available commands:\n"
+				"\tr : toggle the 12V regulator\n"
+				"\td : init display\n"
+				"\ts : scan I2C bus\n"
+			);
+			break;
+		case 'd':
+			printf("Initializing display...\n");
+			u8g2 = display_init();
+		    u8g2_ClearBuffer(u8g2);
+			u8g2_DrawBox(u8g2, 0, 0, 20, 10);
+			u8g2_SendBuffer(u8g2);
+			break;
+		case 's':
+			printf("Scanning I2C bus...\n");
+			i2c_scan(I2C1, print_i2c_device);
+			break;
+		default:
+			printf("Unknown command '%c'\n", data[0]);
+			break;
+		}
+	}
+	else {
+		// echo
+		// _write(0, (const char*)data, numbytes);
+	}
+}
+
+
+// triggered on the falling edge of the rotary encoder PIN_A
+void EXTI15_8_IRQHandler(void) __attribute__((interrupt));
+void EXTI15_8_IRQHandler(void)
+{
+	uint32_t now = funSysTick32();
+	if (now - last_interrupt > ENCODER_DEBOUNCE) {
+		last_interrupt = now;
+		if (funDigitalRead(PIN_ENC_A)) {
+			encoder++;
+		} else {
+			encoder--;
+		}
+	}
+	EXTI->INTFR = EXTI_Line11;
+}
+
+
+__attribute__((noreturn)) int main(void)
+{
+	SystemInit();
+	funGpioInitAll();
+	funAnalogInit();
+	USBFSSetup();
+
+	funPinMode(PIN_VBUS, GPIO_CFGLR_IN_ANALOG);
+	funPinMode(PIN_CURRENT, GPIO_CFGLR_IN_ANALOG);
+	funPinMode(PIN_NTC, GPIO_CFGLR_IN_ANALOG);
+	funPinMode(PIN_TEMP, GPIO_CFGLR_IN_ANALOG);
+
+	funPinMode(PIN_LED, GPIO_CFGLR_OUT_10Mhz_PP);
+	funPinMode(PIN_12V, GPIO_CFGLR_OUT_10Mhz_PP);
+	funDigitalWrite(PIN_12V, 0);
+	funPinMode(PIN_HEATER, GPIO_CFGLR_OUT_10Mhz_PP);
+	funDigitalWrite(PIN_HEATER, 0);
+	funPinMode(PIN_DISP_RST, GPIO_CFGLR_OUT_10Mhz_PP);
+	funDigitalWrite(PIN_DISP_RST, 1); // start with display disabled
+
+	funPinMode(PIN_ENC_A, GPIO_CFGLR_IN_PUPD); // enable pull-up/down
+	funDigitalWrite(PIN_ENC_A, 1); // specify pull-up
+	funPinMode(PIN_ENC_B, GPIO_CFGLR_IN_PUPD); // enable pull-up/down
+	funDigitalWrite(PIN_ENC_B, 1); // specify pull-up
+	funPinMode(PIN_BTN, GPIO_CFGLR_IN_FLOAT);
+
+	Delay_Ms(5000);
+
+	/* -------- Code to get hardware I2C working on the CH32X035F8U6 -------- */
+	// Order here matters, first initialize the AFIO and I2C subsystems then
+	// change register values, do that the other way around and the configuration
+	// wont take effect
+	// Enable AFIO (Alternate Function IO)
+	RCC->APB2PCENR |= RCC_AFIOEN;
+	// Init I2C
+    i2c_init(I2C_TARGET, FUNCONF_SYSTEM_CORE_CLOCK, 100000);
+
+    // To utilize the I2C bus we need to disable SWD first, since the pins overlap
+	AFIO->PCFR1 &= ~(0b0111 << 24);
+	AFIO->PCFR1 |=   0b0100 << 24;
+
+	// Map SCL to PC18 and SDA to PC19
+	AFIO->PCFR1 |= 0b0101 << 2;
+	// Manually set the I2C pins to Alternate Function IO,  CNF=10b, MODE=10b
+	GPIOC->CFGXR &= ~((0xF << 8) | (0xF << 12)); // first clear the bits
+	// then set them
+	GPIOC->CFGXR |= 0b1010 << 8; // PC18
+	GPIOC->CFGXR |= 0b1010 << 12; // PC19
+
+
+ 	// Configure the IO as an interrupt.
+ 	// PIN_ENC_B is on port B, channel 11
+    AFIO->EXTICR1 = AFIO_EXTICR1_EXTI11_PB; // Port B channel (pin) 11
+    EXTI->INTENR = EXTI_INTENR_MR11; // Enable EXT11
+    EXTI->FTENR = EXTI_FTENR_TR11;  // Falling edge trigger
+    // enable interrupt
+    NVIC_EnableIRQ(EXTI15_8_IRQn);
+
+	Delay_Ms(500);
+
+	unsigned int count = 0;
+
+	for (uint32_t x = 0; true ; x++) {
+		poll_input(); // usb
+		if ((x % 100) == 0) {
+			uint16_t vbus_mv = (funAnalogRead(VBUS_ADC_CHANNEL)*3300*11)/4095;
+			uint16_t current_ma = ((uint32_t)funAnalogRead(CURRENT_ADC_CHANNEL) * 4125 + 1024) / 2048;
+			int16_t temp_k = get_temp_k(funAnalogRead(NTC_ADC_CHANNEL));
+			uint16_t temp_tip_k = funAnalogRead(TEMP_ADC_CHANNEL);
+
+			printf("[%d]: VBUS=%d, CURRENT=%d, TEMP=%d, TIP=%d, COUNTER=%d\n", count++, vbus_mv, current_ma, temp_k, temp_tip_k, encoder);
+
+			funDigitalWrite(PIN_LED, pin);
+			pin = !pin;
+		}
+		Delay_Ms(1);
+	}
+}

fw/programmer/.gitignore

@@ -0,0 +1,5 @@
+.pio
+.zed
+.vscode
+.cache
+compile_commands.json

fw/programmer/platformio.ini

@@ -0,0 +1,14 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:default]
+platform = https://github.com/maxgerhardt/platform-raspberrypi
+framework = arduino
+board = rpipico

fw/programmer/src/bitbang_rvswdio_pico.h

@@ -0,0 +1,197 @@
+#include <hardware/gpio.h>
+#include <pico/time.h>
+
+#include "bitbang_rvswdio.h"
+#include "hardware/timer.h"
+#include "lwipopts.h"
+#include "pico.h"
+
+
+#define PIN_SWDIO 10
+#define PIN_SWCLK 11
+
+
+// wait time between line transitions
+#define SWD_DELAY() busy_wait_us(2);
+
+// microseconds between each register read/write
+#define STOP_WAIT 8
+
+// Single wire debug (SWDIO and SWCLK)
+static inline void ConfigureIOForRVSWD(void)
+{
+    // SWCLK forced, starts at 1
+	gpio_init(PIN_SWCLK);
+    gpio_set_pulls(PIN_SWCLK, false, false);
+    gpio_put(PIN_SWCLK, 1);
+    gpio_set_dir(PIN_SWCLK, GPIO_OUT);
+
+    // SWDIO, open drain (emulated) with pull-up
+	gpio_init(PIN_SWDIO);
+    gpio_set_pulls(PIN_SWDIO, true, false);
+    gpio_put(PIN_SWDIO, 1);
+    gpio_set_dir(PIN_SWDIO, GPIO_IN);
+}
+
+
+// Single wire input-output SDI (just SWDIO)
+static inline void ConfigureIOForRVSWIO(void)
+{
+	//BB_PRINTF_DEBUG( "TODO: add support for SWIO\n" );
+}
+
+
+void rvswd_write_bit(bool value)
+{
+    gpio_put(PIN_SWCLK, 0);
+    gpio_put(PIN_SWDIO, value);
+    gpio_set_dir(PIN_SWDIO, GPIO_OUT);
+    gpio_set_dir(PIN_SWDIO, GPIO_IN);
+    SWD_DELAY();
+    gpio_put(PIN_SWCLK, 1);  // Data is sampled on rising edge of clock
+    SWD_DELAY();
+}
+
+
+bool rvswd_read_bit(void)
+{
+	gpio_put(PIN_SWDIO, 1);
+	gpio_set_dir(PIN_SWDIO, GPIO_IN);
+    gpio_put(PIN_SWCLK, 0);
+    SWD_DELAY();
+    bool bit = gpio_get(PIN_SWDIO);
+    gpio_put(PIN_SWCLK, 1);  // Data is output on rising edge of clock
+    SWD_DELAY();
+    return bit;
+}
+
+
+static inline void rvswd_stop(void)
+{
+    gpio_put(PIN_SWCLK, 0);
+    SWD_DELAY();
+    gpio_put(PIN_SWDIO, 0);
+    gpio_set_dir(PIN_SWDIO, GPIO_OUT);
+    SWD_DELAY();
+    gpio_put(PIN_SWCLK, 1);
+    SWD_DELAY();
+    gpio_put(PIN_SWDIO, 1);
+    gpio_set_dir(PIN_SWDIO, GPIO_IN);
+}
+
+
+static void MCFWriteReg32( struct SWIOState * state, uint8_t command, uint32_t value )
+{
+	// only supported mode is SWD
+	if (state->opmode != 2) {
+		//BB_PRINTF_DEBUG( "TODO: add support for SWIO\n" );
+		return;
+	}
+
+	noInterrupts();
+
+	// start transaction
+	gpio_put(PIN_SWDIO, 0);
+	gpio_set_dir(PIN_SWDIO, GPIO_OUT);
+	SWD_DELAY();
+
+    // ADDR HOST
+    bool parity = true;
+    for (uint32_t mask = 1<<6; mask; mask >>= 1) {
+        bool bit = !!(command & mask);
+        parity ^= bit;
+        rvswd_write_bit(bit);
+    }
+
+    rvswd_write_bit(1); // Operation: write
+    rvswd_write_bit(parity);
+    rvswd_read_bit(); // ???
+	rvswd_read_bit(); // Seems only need to be set for first transaction (We are ignoring that though)
+	rvswd_read_bit(); // ???
+	rvswd_write_bit(0); // 0 for register, 1 for value.
+	rvswd_write_bit(0); // ???  Seems to have something to do with halting.
+
+    // DATA
+    parity = false;  // This time it's even parity?
+    for (uint32_t mask = 1<<31; mask; mask >>= 1) {
+        bool bit = !!(value & mask);
+        parity ^= bit;
+        rvswd_write_bit(bit);
+    }
+
+    // Parity bit
+    rvswd_write_bit(parity);
+
+    rvswd_read_bit(); // ???
+	rvswd_read_bit(); // ???
+	rvswd_read_bit(); // ???
+	rvswd_write_bit(1); // 0 for register, 1 for value
+	rvswd_write_bit(0); // ??? Seems to have something to do with halting?
+
+    rvswd_stop();
+    interrupts();
+    sleep_us(STOP_WAIT);
+}
+
+
+static int MCFReadReg32( struct SWIOState * state, uint8_t command, uint32_t * value )
+{
+	// only supported mode is SWD
+	if (state->opmode != 2) {
+		//BB_PRINTF_DEBUG( "TODO: add support for SWIO\n" );
+		return -1;
+	}
+
+	noInterrupts();
+
+	// start transaction
+	gpio_put(PIN_SWDIO, 0);
+	gpio_set_dir(PIN_SWDIO, GPIO_OUT);
+	SWD_DELAY();
+
+    // ADDR HOST
+    bool parity = false;
+    for (uint8_t mask = 1<<6; mask; mask >>= 1) {
+        bool bit = !!(command & mask);
+        parity ^= bit;
+        rvswd_write_bit(bit);
+    }
+
+    rvswd_write_bit(0); // Operation: read
+    rvswd_write_bit(parity);
+    rvswd_read_bit(); // ??
+    rvswd_read_bit(); // ??
+    rvswd_read_bit(); // ??
+    rvswd_write_bit(0); // 0 for register, 1 for value
+    rvswd_write_bit(0); // ??? Seems to have something to do with halting?
+
+    // DATA
+    *value = 0;
+    parity = false;
+    uint32_t rval = 0;
+    for (uint8_t position = 0; position < 32; position++) {
+        bool bit = rvswd_read_bit();
+        rval <<= 1;
+       	rval |= bit;
+       	parity ^= bit;
+    }
+    *value = rval;
+
+    // Parity bit
+    bool parity_read = rvswd_read_bit();
+    if (parity_read != parity) goto read_end;
+
+    rvswd_read_bit(); // ??
+    rvswd_read_bit(); // ??
+    rvswd_read_bit(); // ??
+    rvswd_write_bit(1); // 0 for register, 1 for value
+	rvswd_write_bit(0); // ??? Seems to have something to do with halting?
+
+    rvswd_stop();
+
+read_end:
+    interrupts();
+    sleep_us(STOP_WAIT);
+    BB_PRINTF_DEBUG("wrong parity: %d\n", parity_read);
+    return (parity == parity_read) ? 0 : -1;
+}

fw/programmer/src/main.cpp

@@ -0,0 +1,59 @@
+#include "pico/time.h"
+#include <Arduino.h>
+#include <SerialUSB.h>
+
+#define BB_PRINTF_DEBUG(...) Serial.printf(__VA_ARGS__)
+//#define BB_PRINTF_DEBUG(...)
+#include "bitbang_rvswdio.h"
+#include "bitbang_rvswdio_pico.h"
+
+SWIOState state = {.opmode = 2};
+
+void setup() {
+    Serial.begin(115200);
+	Serial.setTimeout(100);
+}
+
+
+void setup1()
+{
+	pinMode(LED_BUILTIN, OUTPUT);
+}
+
+
+void loop() {
+    if (Serial.available() > 0) {
+        char cmd = Serial.read();
+        int ret = 0;
+        uint8_t reg;
+
+        switch (cmd) {
+        case '!':
+        	state = {};
+        	ret = InitializeSWDSWIO(&state);
+         	if (ret != 0) {
+          		Serial.printf("error initializing SWD: %d\n", ret);
+            	break;
+          	}
+          	ret = DetermineChipTypeAndSectorInfo(&state, NULL);
+            if (ret != 0) {
+          		Serial.printf("failed to determine chip type: %d\n", ret);
+            	break;
+            }
+            Serial.printf("chip type is %x\n", state.target_chip_type);
+        	break;
+        default:
+        	Serial.printf("unknown command '%c'\n", cmd);
+         	break;
+        }
+    }
+}
+
+
+void loop1()
+{
+	digitalWrite(LED_BUILTIN, 1);
+	delay(200);
+	digitalWrite(LED_BUILTIN, 0);
+	delay(200);
+}

fw/programmer/test/rvswd.c

@@ -0,0 +1,199 @@
+#include "rvswd.h"
+#include <inttypes.h>
+#include <stdint.h>
+#include <hardware/gpio.h>
+#include <pico/time.h>
+
+
+// adapted from https://github.com/Nicolai-Electronics/esp32-component-rvswd
+
+rvswd_result_t rvswd_init(rvswd_handle_t* handle) {
+    //gpio_config_t swio_cfg = {
+    //    .pin_bit_mask = BIT64(handle->swdio),
+    //    .mode = GPIO_MODE_INPUT_OUTPUT_OD,
+    //    .pull_up_en = true,
+    //    .pull_down_en = false,
+    //    .intr_type = GPIO_INTR_DISABLE,
+    //};
+    gpio_init(handle->swdio);
+    gpio_set_pulls(handle->swdio, true, false);
+    gpio_put(handle->swdio, 0);
+    gpio_set_dir(handle->swdio, GPIO_IN);
+
+    //gpio_config_t swck_cfg = {
+    //    .pin_bit_mask = BIT64(handle->swclk),
+    //    .mode = GPIO_MODE_OUTPUT,
+    //    .pull_up_en = false,
+    //    .pull_down_en = false,
+    //    .intr_type = GPIO_INTR_DISABLE,
+    //};
+    gpio_init(handle->swclk);
+    gpio_set_pulls(handle->swclk, false, false);
+    gpio_put(handle->swclk, 0);
+    gpio_set_dir(handle->swclk, GPIO_OUT);
+
+    return RVSWD_OK;
+}
+
+rvswd_result_t rvswd_start(rvswd_handle_t* handle) {
+    // Start with both lines high
+    // open drain emulation, input for high (pulled up) and out for low (forced)
+    gpio_set_dir(handle->swdio, GPIO_IN); // high
+    gpio_put(handle->swclk, 1);
+    sleep_us(2);
+
+    // Pull data low
+    gpio_set_dir(handle->swdio, GPIO_OUT); // low
+    gpio_put(handle->swclk, 1);
+    sleep_us(1);
+
+    // Pull clock low
+    gpio_set_dir(handle->swdio, GPIO_OUT); // low
+    gpio_put(handle->swclk, 0);
+    sleep_us(1);
+
+    return RVSWD_OK;
+}
+
+rvswd_result_t rvswd_stop(rvswd_handle_t* handle) {
+    // Pull data low
+    gpio_set_dir(handle->swdio, GPIO_OUT);
+    sleep_us(1);
+    gpio_put(handle->swclk, 1);
+    sleep_us(2);
+
+    // Let data float high
+    gpio_set_dir(handle->swdio, GPIO_IN);
+    sleep_us(1);
+    return RVSWD_OK;
+}
+
+rvswd_result_t rvswd_reset(rvswd_handle_t* handle) {
+    // set data floating high
+	gpio_set_dir(handle->swdio, GPIO_IN);
+    sleep_us(1);
+    // let clock go brrr
+    for (uint8_t i = 0; i < 100; i++) {
+        gpio_put(handle->swclk, 0);
+        sleep_us(1);
+        gpio_put(handle->swclk, 1);
+        sleep_us(1);
+    }
+    return rvswd_stop(handle);
+}
+
+#define OD_PULL(pin, value) gpio_set_dir((pin), (value) ? GPIO_IN : GPIO_OUT)
+
+void rvswd_write_bit(rvswd_handle_t* handle, bool value) {
+    OD_PULL(handle->swdio, value);
+    gpio_put(handle->swclk, 0);
+    // FIXME: does this need a delay?
+    gpio_put(handle->swclk, 1);  // Data is sampled on rising edge of clock
+}
+
+bool rvswd_read_bit(rvswd_handle_t* handle) {
+	// let data float high
+    gpio_set_dir(handle->swdio, GPIO_IN);
+    // pulse clock
+    gpio_put(handle->swclk, 0);
+    gpio_put(handle->swclk, 1);  // Data is output on rising edge of clock
+    // FIXME: does this need a delay?
+    return gpio_get(handle->swdio);
+}
+
+rvswd_result_t rvswd_write(rvswd_handle_t* handle, uint8_t reg, uint32_t value) {
+    rvswd_start(handle);
+
+    // ADDR HOST
+    bool parity = false;  // This time it's odd parity?
+    for (uint8_t position = 0; position < 7; position++) {
+        bool bit = (reg >> (6 - position)) & 1;
+        rvswd_write_bit(handle, bit);
+        if (bit) parity = !parity;
+    }
+
+    // Operation: write
+    rvswd_write_bit(handle, true);
+    parity = !parity;
+
+    // Parity bit (even)
+    rvswd_write_bit(handle, parity);
+
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+
+    // Data
+    parity = false;  // This time it's even parity?
+    for (uint8_t position = 0; position < 32; position++) {
+        bool bit = (value >> (31 - position)) & 1;
+        rvswd_write_bit(handle, bit);
+        if (bit) parity = !parity;
+    }
+
+    // Parity bit
+    rvswd_write_bit(handle, parity);
+
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 1);
+
+    rvswd_stop(handle);
+
+    return RVSWD_OK;
+}
+
+rvswd_result_t rvswd_read(rvswd_handle_t* handle, uint8_t reg, uint32_t* value) {
+    bool parity;
+
+    rvswd_start(handle);
+
+    // ADDR HOST
+    parity = false;
+    for (uint8_t position = 0; position < 7; position++) {
+        bool bit = (reg >> (6 - position)) & 1;
+        rvswd_write_bit(handle, bit);
+        if (bit) parity = !parity;
+    }
+
+    // Operation: read
+    rvswd_write_bit(handle, false);
+
+    // Parity bit (even)
+    rvswd_write_bit(handle, parity);
+
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+
+    *value = 0;
+
+    // Data
+    parity = false;
+    for (uint8_t position = 0; position < 32; position++) {
+        bool bit = rvswd_read_bit(handle);
+        if (bit) {
+            *value |= 1 << (31 - position);
+        }
+        if (bit) parity = !parity;
+    }
+
+    // Parity bit
+    bool parity_read = rvswd_read_bit(handle);
+
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 0);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 1);
+    rvswd_write_bit(handle, 1);
+
+    rvswd_stop(handle);
+
+    return (parity == parity_read) ? RVSWD_OK : RVSWD_FAIL;
+}

fw/programmer/test/rvswd.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef struct rvswd_handle {
+    int swdio;
+    int swclk;
+} rvswd_handle_t;
+
+typedef enum rvswd_result {
+    RVSWD_OK = 0,
+    RVSWD_FAIL = 1,
+    RVSWD_INVALID_ARGS = 2,
+    RVSWD_PARITY_ERROR = 3,
+} rvswd_result_t;
+
+rvswd_result_t rvswd_init(rvswd_handle_t* handle);
+rvswd_result_t rvswd_reset(rvswd_handle_t* handle);
+rvswd_result_t rvswd_write(rvswd_handle_t* handle, uint8_t reg, uint32_t value);
+rvswd_result_t rvswd_read(rvswd_handle_t* handle, uint8_t reg, uint32_t* value);

fw/u8g2

@@ -0,0 +1 @@
+Subproject commit 3b8939cd015d6aca6a19f761df84859916f1f7d9

fw/usb_config.h

@@ -0,0 +1,182 @@
+#ifndef _USB_CONFIG_H
+#define _USB_CONFIG_H
+
+#include "funconfig.h"
+#include "ch32fun.h"
+
+// Endpoint numbers, at least one (EP0)
+#define FUSB_CONFIG_EPS       4
+// Endpoint configuration for CDC TTY
+#define FUSB_EP1_MODE         1 // TX (IN), CDC Interrupt Endpoint
+#define FUSB_EP2_MODE        -1 // RX (OUT), CDC Data OUT
+#define FUSB_EP3_MODE         1 // TX (IN), CDC Data IN
+// Other hardware configuration
+#define FUSB_SUPPORTS_SLEEP   0
+#define FUSB_HID_INTERFACES   0
+#define FUSB_CURSED_TURBO_DMA 0 // Hacky, but seems fine, shaves 2.5us off filling 64-byte buffers.
+#define FUSB_HID_USER_REPORTS 0
+#define FUSB_IO_PROFILE       0
+#define FUSB_USE_HPE          FUNCONF_ENABLE_HPE
+#define FUSB_USER_HANDLERS    1
+#define FUSB_USE_DMA7_COPY    0
+#define FUSB_VDD_5V           0 // 3.3V
+
+#include "usb_defines.h"
+
+#define FUSB_USB_VID 0x1209
+#define FUSB_USB_PID 0xd035
+#define FUSB_USB_REV 0x0007
+#define FUSB_STR_MANUFACTURER u"ch32fun"
+#define FUSB_STR_PRODUCT      u"USB TTY"
+#define FUSB_STR_SERIAL       u"007"
+
+//Taken from http://www.usbmadesimple.co.uk/ums_ms_desc_dev.htm
+static const uint8_t device_descriptor[] = {
+	18, //bLength - Length of this descriptor
+	1,  //bDescriptorType - Type (Device)
+	0x10, 0x01, //bcdUSB - The highest USB spec version this device supports (USB1.1)
+	0x02, //bDeviceClass - Device Class
+	0x0, //bDeviceSubClass - Device Subclass
+	0x0, //bDeviceProtocol - Device Protocol  (000 = use config descriptor)
+	64, //bMaxPacketSize - Max packet size for EP0
+	(uint8_t)(FUSB_USB_VID), (uint8_t)(FUSB_USB_VID >> 8), //idVendor - ID Vendor
+	(uint8_t)(FUSB_USB_PID), (uint8_t)(FUSB_USB_PID >> 8), //idProduct - ID Product
+	(uint8_t)(FUSB_USB_REV), (uint8_t)(FUSB_USB_REV >> 8), //bcdDevice - Device Release Number
+	1, //iManufacturer - Index of Manufacturer string
+	2, //iProduct - Index of Product string
+	3, //iSerialNumber - Index of Serial string
+	1, //bNumConfigurations - Max number of configurations (if more then 1, you can switch between them)
+};
+
+/* Configuration Descriptor Set */
+static const uint8_t config_descriptor[ ] =
+{
+  0x09,        // bLength
+  0x02,        // bDescriptorType (Configuration)
+  0x43, 0x00,  // wTotalLength 67
+  0x02,        // bNumInterfaces 2
+  0x01,        // bConfigurationValue
+  0x00,        // iConfiguration (String Index)
+  0x80,        // bmAttributes
+  0x32,        // bMaxPower 100mA
+
+  0x09,        // bLength
+  0x04,        // bDescriptorType - Interface
+  0x00,        // bInterfaceNumber - 0
+  0x00,        // bAlternateSetting
+  0x01,        // bNumEndpoints - 1
+  0x02,        // bInterfaceClass - CDC
+  0x02,        // bInterfaceSubClass - Abstract Control Model (Table 4 in CDC120.pdf)
+  0x01,        // bInterfaceProtocol - AT Commands: V.250 etc (Table 5)
+  0x00,        // iInterface (String Index)
+
+  // Setting up CDC interface (Table 18)
+  0x05,        // bLength
+  0x24,        // bDescriptorType - CS_INTERFACE (Table 12)
+  0x00,        // bDescriptorSubType - Header Functional Descriptor (Table 13)
+  0x10, 0x01,  // bcdCDC - USB version - USB1.1
+  // Call Management Functional Descriptor
+  0x05,        // bLength
+  0x24,        // bDescriptorType - CS_INTERFACE
+  0x01,        // bDescriptorSubType - Call Management Functional Descriptor (Table 13)
+  0x00,        // bmCapabilities: (Table 3 in PSTN120.pdf)
+  // Bit 0 — Device handles call management itself:
+  //  1 = device handles call management (e.g. call setup, termination, etc.)
+  //  0 = host handles it
+  // Bit 1 — Device can send/receive call management information over a Data Class interface:
+  //  1 = can use the Data Class interface for call management
+  //  0 = must use the Communication Class interface
+  0x01,        // bDataInterface - Indicates that multiplexed commands are handled via data interface 01h (same value as used in the UNION Functional Descriptor)
+  // Abstract Control Management Functional Descriptor
+  0x04,        // bLength
+  0x24,        // bDescriptorType - CS_INTERFACE
+  0x02,        // bDescriptorSubType - Abstract Control Management Functional Descriptor (Table 13)
+  0x02,        // bmCapabilities - Device supports the request combination of Set_Line_Coding, Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State (Table 4 in PSTN120.pdf)
+  // Union Descriptor Functional Descriptor
+  0x05,        // bLength
+  0x24,        // bDescriptorType - CS_INTERFACE
+  0x06,        // bDescriptorSubType - Union Descriptor Functional Descriptor (Table 13)
+  0x00,        // bControlInterface (Interface number of the control (Communications Class) interface)
+  0x01,        // bSubordinateInterface0 (Interface number of the subordinate (Data Class) interface)
+  // Setting up EP1 for CDC config interface
+  0x07,        // bLength
+  0x05,        // bDescriptorType (Endpoint)
+  0x81,        // bEndpointAddress (IN/D2H)
+  0x03,        // bmAttributes (Interrupt)
+  0x40, 0x00,  // wMaxPacketSize 64
+  0x01,        // bInterval 1 (unit depends on device speed)
+
+  // Transmission interface with two bulk endpoints
+  0x09,        // bLength
+  0x04,        // bDescriptorType (Interface)
+  0x01,        // bInterfaceNumber 1
+  0x00,        // bAlternateSetting
+  0x02,        // bNumEndpoints 2
+  0x0A,        // bInterfaceClass
+  0x00,        // bInterfaceSubClass
+  0x00,        // bInterfaceProtocol - Transparent
+  0x00,        // iInterface (String Index)
+  // EP2 - device to host
+  0x07,        // bLength
+  0x05,        // bDescriptorType (Endpoint)
+  0x02,        // bEndpointAddress (OUT/H2D)
+  0x02,        // bmAttributes (Bulk)
+  0x40, 0x00,  // wMaxPacketSize 64
+  0x00,        // bInterval 0 (unit depends on device speed)
+  // EP3 - host to device
+  0x07,        // bLength
+  0x05,        // bDescriptorType (Endpoint)
+  0x83,        // bEndpointAddress (IN/D2H)
+  0x02,        // bmAttributes (Bulk)
+  0x40, 0x00,  // wMaxPacketSize 64
+  0x00,        // bInterval 0 (unit depends on device speed)
+
+  // 67 bytes
+};
+
+struct usb_string_descriptor_struct {
+	uint8_t bLength;
+	uint8_t bDescriptorType;
+	uint16_t wString[];
+};
+const static struct usb_string_descriptor_struct language __attribute__((section(".rodata"))) = {
+	4,
+	3,
+	{0x0409}  // Language ID - English US (look in USB_LANGIDs)
+};
+const static struct usb_string_descriptor_struct string1 __attribute__((section(".rodata")))  = {
+	sizeof(FUSB_STR_MANUFACTURER),
+	3,  // bDescriptorType - String Descriptor (0x03)
+	FUSB_STR_MANUFACTURER
+};
+const static struct usb_string_descriptor_struct string2 __attribute__((section(".rodata")))  = {
+	sizeof(FUSB_STR_PRODUCT),
+	3,
+	FUSB_STR_PRODUCT
+};
+const static struct usb_string_descriptor_struct string3 __attribute__((section(".rodata")))  = {
+	sizeof(FUSB_STR_SERIAL),
+	3,
+	FUSB_STR_SERIAL
+};
+
+// This table defines which descriptor data is sent for each specific
+// request from the host (in wValue and wIndex).
+const static struct descriptor_list_struct {
+	uint32_t	lIndexValue;  // (uint16_t)Index of a descriptor in config or Language ID for string descriptors | (uint8_t)Descriptor type | (uint8_t)Type of string descriptor
+	const uint8_t	*addr;
+	uint8_t		length;
+} descriptor_list[] = {
+	{0x00000100, device_descriptor, sizeof(device_descriptor)},
+	{0x00000200, config_descriptor, sizeof(config_descriptor)},
+	// {0x00002100, config_descriptor + 18, 9 }, // Not sure why, this seems to be useful for Windows + Android.
+
+	{0x00000300, (const uint8_t *)&language, 4},
+	{0x04090301, (const uint8_t *)&string1, string1.bLength},
+	{0x04090302, (const uint8_t *)&string2, string2.bLength},
+	{0x04090303, (const uint8_t *)&string3, string3.bLength}
+};
+#define DESCRIPTOR_LIST_ENTRIES ((sizeof(descriptor_list))/(sizeof(struct descriptor_list_struct)) )
+
+
+#endif

hw/.gitignore

@@ -39,3 +39,7 @@ fp-info-cache
 
 # Local project settings
 *.kicad_prl
+.history
+
+# fabrication toolkit output
+production

hw/bom/bom_preliminary_lcsc.csv

@@ -1,29 +1,28 @@
 Index,LCSC#,MPN,Manufacturer,Package,Customer #,Description,RoHS,Quantity,MOQ,Multiple,Unit Price(€),Extended Price(€),Product Link
-1,C473369,TLV333IDBVR,TI,SOT-23-5,,"2uV Rail-to-Rail Input, Rail-to-Rail Output 70pA 0.16V/us 102dB 17uA 350kHz 1 SOT-23-5 Amplifiers RoHS",yes,5,5,5,0.2047,1.02,https://www.lcsc.com/product-detail/C473369.html
-2,C2827931,SS24L,Guangdong Hottech,SOD-123FL,,Diode Independent 40V 2A Surface Mount SOD-123FL,yes,20,20,20,0.0214,0.43,https://www.lcsc.com/product-detail/C2827931.html
+1,C473369,TLV333IDBVR,TI,SOT-23-5,,"2uV Rail-to-Rail Input, Rail-to-Rail Output 70pA 0.16V/us 102dB 17uA 350kHz 1 SOT-23-5 Amplifiers RoHS",yes,5,5,5,0.2121,1.06,https://www.lcsc.com/product-detail/C473369.html
+2,C2827931,SS24L,Guangdong Hottech,SOD-123FL,,Diode Independent 40V 2A Surface Mount SOD-123FL,yes,20,20,20,0.0204,0.41,https://www.lcsc.com/product-detail/C2827931.html
 3,C2931472,U263-163N-4OS1735,XKB Connection,SMD,,USB-C (USB TYPE-C) Receptacle Connector 16 Position Surface Mount,yes,5,5,5,0.2518,1.26,https://www.lcsc.com/product-detail/C2931472.html
 4,C2999960,MM5Z3V3,Slkor,SOD-523,,Zener Diode Independent 3.3V 200mW Surface Mount SOD-523,yes,20,20,20,0.0180,0.36,https://www.lcsc.com/product-detail/C2999960.html
-5,C52754543,RB521S30T1G-HXY,HXY MOSFET,SOD-523,,1A 1 Independent 30V 350mV@10mA 200mA SOD-523 Single Diodes RoHS,yes,20,20,20,0.0212,0.42,https://www.lcsc.com/product-detail/C52754543.html
+5,C52754543,RB521S30T1G-HXY,HXY MOSFET,SOD-523,,1A 1 Independent 30V 350mV@10mA 200mA SOD-523 Single Diodes RoHS,yes,20,20,20,0.0202,0.40,https://www.lcsc.com/product-detail/C52754543.html
 6,C42442062,CH32X035F8U6,WCH,QFN-20-EP(3x3),,QFN-20-EP(3x3) Microcontrollers RoHS,yes,5,1,1,0.4460,2.23,https://www.lcsc.com/product-detail/C42442062.html
-7,C780769,AP63203WU-7,DIODES,TSOT-23-6,,1.1MHz Buck Fixed 2A 3.3V TSOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,yes,5,1,1,0.3955,1.98,https://www.lcsc.com/product-detail/C780769.html
-8,C7466527,AGM403AP,AGMSEMI,PDFN3.3x3.3-8,,N-Channel 40V 65A 69W Surface Mount PDFN3.3x3.3,yes,5,5,5,0.2575,1.29,https://www.lcsc.com/product-detail/C7466527.html
+7,C780769,AP63203WU-7,DIODES,TSOT-23-6,,1.1MHz Buck Fixed 2A 3.3V 3.8V~32V TSOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,yes,5,1,1,0.3766,1.88,https://www.lcsc.com/product-detail/C780769.html
+8,C7466527,AGM403AP,AGMSEMI,PDFN3.3x3.3-8,,N-Channel 40V 65A 69W Surface Mount PDFN3.3x3.3,yes,5,5,5,0.2447,1.22,https://www.lcsc.com/product-detail/C7466527.html
 9,C2906999,FRC0603F1803TS,FOJAN,0603,,180kΩ ±1% 100mW 0603 Thick Film Resistor,yes,100,100,100,0.0010,0.10,https://www.lcsc.com/product-detail/C2906999.html
 10,C4169844,RS73F1JTTD2703B,KOA,0603,,200mW 270kΩ Thick Film Resistor ±25ppm/℃ ±0.1% 0603 Chip Resistor - Surface Mount RoHS,yes,5,5,5,0.0638,0.32,https://www.lcsc.com/product-detail/C4169844.html
-11,C2932326,MT3608L,XI'AN Aerosemi Tech,SOT-23-6,,1.2MHz Boost Adjustable 2.5A SOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,yes,10,10,10,0.0373,0.37,https://www.lcsc.com/product-detail/C2932326.html
-12,C138714,TPD4E05U06DQAR,TI,USON-10(1x2.5),,14VC Clamp 2.5A@8/20us Ipp TVS DIODE USON-10(1x2.5),yes,5,5,5,0.0629,0.31,https://www.lcsc.com/product-detail/C138714.html
+11,C2932326,MT3608L,XI'AN Aerosemi Tech,SOT-23-6,,1.2MHz Boost Adjustable 2.2V~16V 2.5A SOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,yes,10,10,10,0.0373,0.37,https://www.lcsc.com/product-detail/C2932326.html
+12,C138714,TPD4E05U06DQAR,TI,USON-10(1x2.5),,14VC Clamp 2.5A@8/20us Ipp TVS DIODE USON-10(1x2.5),yes,5,5,5,0.0679,0.34,https://www.lcsc.com/product-detail/C138714.html
 13,C19274408,SC7A20HTR,Hangzhou Silan Microelectronics,LGA-12(2x2),,LGA-12(2x2) Accelerometers RoHS,yes,5,1,1,0.2417,1.21,https://www.lcsc.com/product-detail/C19274408.html
 14,C52741377,CPN201610H6R8MT,Magnetsyc,0806,,820mA 6.8uH 1.1A 545mΩ ±20% 0806 Fixed Inductors RoHS,yes,20,20,20,0.0277,0.55,https://www.lcsc.com/product-detail/C52741377.html
-15,C18723015,X087-2832TSWIG02-H14,Wisevision,-,,"0.87 128x32 SSD1312 chip I2C LCD, OLED, Graphic RoHS",yes,5,1,1,1.6435,8.22,https://www.lcsc.com/product-detail/C18723015.html
-16,C110776,RT0603BRD071KL,YAGEO,0603,,100mW 1kΩ 75V Thin Film Resistor ±25ppm/℃ ±0.1% 0603 Chip Resistor - Surface Mount RoHS,yes,20,20,20,0.0187,0.37,https://www.lcsc.com/product-detail/C110776.html
-17,C162670,NCU18XH103F6SRB,muRata,0603,,NTC Thermistor 10kΩ Surface Mount 0603,yes,10,10,10,0.0533,0.53,https://www.lcsc.com/product-detail/C162670.html
-18,C46818248,SIQ-02FVS3,LZG,-,,Encoders - Industrial RoHS,yes,5,1,1,0.9816,4.91,https://www.lcsc.com/product-detail/C46818248.html
-19,C41414522,NSG10752,WXNSIC,SOT-23-6,,High Side Gate Driver IC MOSFET IGBT SOT-23-6,yes,5,1,1,0.4842,2.42,https://www.lcsc.com/product-detail/C41414522.html
-20,C76799,MLZ1608M4R7WT000,TDK,0603,,350mA 4.7uH 120mA 500mΩ Multilayer inductor ±20% 0603 Fixed Inductors RoHS,yes,10,10,10,0.0341,0.34,https://www.lcsc.com/product-detail/C76799.html
-21,C98192,CL21A475KBQNNNE,Samsung Electro-Mechanics,0805,,4.7uF ±10% 50V Ceramic Capacitor X5R 0805,yes,10,10,10,0.0179,0.18,https://www.lcsc.com/product-detail/C98192.html
-22,C29936,CL10B105KA8NNNC,Samsung Electro-Mechanics,0603,,1uF ±10% 25V Ceramic Capacitor X7R 0603,yes,50,50,50,0.0056,0.28,https://www.lcsc.com/product-detail/C29936.html
-23,C1590,CL10B104KA8NNNC,Samsung Electro-Mechanics,0603,,100nF ±10% 25V Ceramic Capacitor X7R 0603,yes,100,100,100,0.0032,0.32,https://www.lcsc.com/product-detail/C1590.html
-24,C2997487,MPD220M1VD19040R,Ymin,"SMD,7.3x4.3mm",,"35V 22uF 3.2A@100kHz 40mΩ@100kHz ±20% SMD,7.3x4.3mm Aluminum - Polymer Capacitors RoHS",yes,5,1,1,0.7063,3.53,https://www.lcsc.com/product-detail/C2997487.html
-25,C5796173,MCASU32MAB7106KPNA01,Taiyo Yuden,1210,,10uF ±10% 50V Ceramic Capacitor X7R 1210,yes,25,5,5,0.0982,2.46,https://www.lcsc.com/product-detail/C5796173.html
-26,C5370906,FC-ALX 4030D-2R2MT,FANGCHENG,"SMD,4.2x4.2mm",,"8.1A 2.2uH 8.1A 10.7mΩ Molded Inductor ±20% SMD,4.2x4.2mm Fixed Inductors RoHS",yes,5,1,1,0.4781,2.39,https://www.lcsc.com/product-detail/C5370906.html
-27,C49851,INA226AIDGSR,TI,MSOP-10,,300mV~40V 2.5uV 10nA MSOP-10 Current Regulation/Management RoHS,yes,5,1,1,0.5765,2.88,https://www.lcsc.com/product-detail/C49851.html
-28,C49164932,JER1206F1R002,JIERR,1206,,1W 2mΩ ±50ppm/℃ Current Sense Resistor ±1% 1206 Current Sense Resistors RoHS,yes,10,10,10,0.0371,0.37,https://www.lcsc.com/product-detail/C49164932.html
+15,C110776,RT0603BRD071KL,YAGEO,0603,,100mW 1kΩ 75V Thin Film Resistor ±25ppm/℃ ±0.1% 0603 Chip Resistor - Surface Mount RoHS,yes,20,20,20,0.0187,0.37,https://www.lcsc.com/product-detail/C110776.html
+16,C162670,NCU18XH103F6SRB,muRata,0603,,NTC Thermistor 10kΩ Surface Mount 0603,yes,10,10,10,0.0533,0.53,https://www.lcsc.com/product-detail/C162670.html
+17,C46818248,SIQ-02FVS3,LZG,-,,Encoders - Industrial RoHS,yes,5,1,1,0.9816,4.91,https://www.lcsc.com/product-detail/C46818248.html
+18,C41414522,NSG10752,WXNSIC,SOT-23-6,,High Side Gate Driver IC MOSFET IGBT SOT-23-6,yes,5,1,1,0.4600,2.30,https://www.lcsc.com/product-detail/C41414522.html
+19,C76799,MLZ1608M4R7WT000,TDK,0603,,350mA 4.7uH 120mA 500mΩ Multilayer inductor ±20% 0603 Fixed Inductors RoHS,yes,10,10,10,0.0341,0.34,https://www.lcsc.com/product-detail/C76799.html
+20,C98192,CL21A475KBQNNNE,Samsung Electro-Mechanics,0805,,4.7uF ±10% 50V Ceramic Capacitor X5R 0805,yes,10,10,10,0.0179,0.18,https://www.lcsc.com/product-detail/C98192.html
+21,C29936,CL10B105KA8NNNC,Samsung Electro-Mechanics,0603,,1uF ±10% 25V Ceramic Capacitor X7R 0603,yes,50,50,50,0.0056,0.28,https://www.lcsc.com/product-detail/C29936.html
+22,C2997487,MPD220M1VD19040R,Ymin,"SMD,7.3x4.3mm",,"35V 22uF 3.2A@100kHz 40mΩ@100kHz ±20% SMD,7.3x4.3mm Aluminum - Polymer Capacitors RoHS",yes,5,1,1,0.7063,3.53,https://www.lcsc.com/product-detail/C2997487.html
+23,C5370906,FC-ALX 4030D-2R2MT,FANGCHENG,"SMD,4.2x4.2mm",,"8.1A 2.2uH 8.1A 10.7mΩ Molded Inductor ±20% SMD,4.2x4.2mm Fixed Inductors RoHS",yes,5,1,1,0.4781,2.39,https://www.lcsc.com/product-detail/C5370906.html
+24,C18723014,X069-9616TSWIG02-H14,Wisevision,-,,"0.69 96x16 SSD1312 chip I2C LCD, OLED, Graphic RoHS",yes,2,1,1,1.3337,2.67,https://www.lcsc.com/product-detail/C18723014.html
+25,C386166,UMK325AB7106KMHP,Taiyo Yuden,1210,,10uF ±10% 50V Ceramic Capacitor X7R 1210 AEC-Q200,yes,25,5,5,0.0854,2.14,https://www.lcsc.com/product-detail/C386166.html
+26,C38582720,TPA191A4-SC6R,3PEAK,SOT-363,,50uV -300mV~+36V 22uA 2.5V/us 120dB 30kHz 80uA 100V/V SOT-363 Amplifiers RoHS,yes,5,5,5,0.5300,2.65,https://www.lcsc.com/product-detail/C38582720.html
+27,C5185587,CUM1206-15FR004,FORT,1206,,1W 4mΩ SMD ±50ppm/℃ Current Sense Resistor ±1% 1206 Current Sense Resistors RoHS,yes,5,1,1,0.0157,0.08,https://www.lcsc.com/product-detail/C5185587.html

hw/bom/order_1.csv

@@ -0,0 +1,28 @@
+LCSC Part Number,Manufacture Part Number,Manufacturer,Customer NO.,Package,Description,RoHS,Quantity,Unit Price(€),Ext.Price(€),Estimated lead time (business days),Date Code / Lot No.
+C473369,TLV333IDBVR,TI,,SOT-23-5,"2uV Rail-to-Rail Input, Rail-to-Rail Output 70pA 0.16V/us 102dB 17uA 350kHz 1 SOT-23-5 Amplifiers RoHS",YES,5,0.2121,1.06,,
+C2827931,SS24L,Guangdong Hottech,,SOD-123FL,Diode Independent 40V 2A Surface Mount SOD-123FL,YES,20,0.0214,0.43,,
+C2931472,U263-163N-4OS1735,XKB Connection,,SMD,USB-C (USB TYPE-C) Receptacle Connector 16 Position Surface Mount,YES,5,0.2518,1.26,,
+C2999960,MM5Z3V3,Slkor,,SOD-523,Zener Diode Independent 3.3V 200mW Surface Mount SOD-523,YES,20,0.0181,0.36,,
+C52754543,RB521S30T1G-HXY,HXY MOSFET,,SOD-523,1A 1 Independent 30V 350mV@10mA 200mA SOD-523 Single Diodes RoHS,YES,20,0.0212,0.42,,
+C42442062,CH32X035F8U6,WCH,,QFN-20-EP(3x3),QFN-20-EP(3x3) Microcontrollers RoHS,YES,5,0.446,2.23,,
+C780769,AP63203WU-7,DIODES,,TSOT-23-6,1.1MHz Buck Fixed 2A 3.3V 3.8V~32V TSOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,YES,5,0.3766,1.88,,
+C7466527,AGM403AP,AGMSEMI,,PDFN3.3x3.3-8,N-Channel 40V 65A 69W Surface Mount PDFN3.3x3.3,YES,5,0.2575,1.29,,
+C2906999,FRC0603F1803TS,FOJAN,,0603,180kΩ ±1% 100mW 0603 Thick Film Resistor,YES,100,0.001,0.10,,
+C4169844,RS73F1JTTD2703B,KOA,,0603,200mW 270kΩ Thick Film Resistor ±25ppm/℃ ±0.1% 0603 Chip Resistor - Surface Mount RoHS,YES,5,0.0638,0.32,,
+C2932326,MT3608L,XI'AN Aerosemi Tech,,SOT-23-6,1.2MHz Boost Adjustable 2.2V~16V 2.5A SOT-23-6 Voltage Regulators - DC DC Switching Regulators RoHS,YES,10,0.0373,0.37,,
+C138714,TPD4E05U06DQAR,TI,,USON-10(1x2.5),14VC Clamp 2.5A@8/20us Ipp TVS DIODE USON-10(1x2.5),YES,5,0.0682,0.34,,
+C19274408,SC7A20HTR,Hangzhou Silan Microelectronics,,LGA-12(2x2),LGA-12(2x2) Accelerometers RoHS,YES,5,0.2417,1.21,,
+C52741377,CPN201610H6R8MT,Magnetsyc,,0806,820mA 6.8uH 1.1A 545mΩ ±20% 0806 Fixed Inductors RoHS,YES,20,0.0277,0.55,,
+C110776,RT0603BRD071KL,YAGEO,,0603,100mW 1kΩ 75V Thin Film Resistor ±25ppm/℃ ±0.1% 0603 Chip Resistor - Surface Mount RoHS,YES,20,0.0187,0.37,,
+C162670,NCU18XH103F6SRB,muRata,,0603,NTC Thermistor 10kΩ Surface Mount 0603,YES,10,0.0533,0.53,,
+C46818248,SIQ-02FVS3,LZG,,-,Encoders - Industrial RoHS,YES,5,0.9816,4.91,,
+C41414522,NSG10752,WXNSIC,,SOT-23-6,High Side Gate Driver IC MOSFET IGBT SOT-23-6,YES,5,0.4842,2.42,,
+C76799,MLZ1608M4R7WT000,TDK,,0603,350mA 4.7uH 120mA 500mΩ Multilayer inductor ±20% 0603 Fixed Inductors RoHS,YES,10,0.0351,0.35,,
+C98192,CL21A475KBQNNNE,Samsung Electro-Mechanics,,0805,4.7uF ±10% 50V Ceramic Capacitor X5R 0805,YES,10,0.0179,0.18,,
+C29936,CL10B105KA8NNNC,Samsung Electro-Mechanics,,0603,1uF ±10% 25V Ceramic Capacitor X7R 0603,YES,50,0.0056,0.28,,
+C2997487,MPD220M1VD19040R,Ymin,,"SMD,7.3x4.3mm","35V 22uF 3.2A@100kHz 40mΩ@100kHz ±20% SMD,7.3x4.3mm Aluminum - Polymer Capacitors RoHS",YES,5,0.7063,3.53,,
+C5370906,FC-ALX 4030D-2R2MT,FANGCHENG,,"SMD,4.2x4.2mm","8.1A 2.2uH 8.1A 10.7mΩ Molded Inductor ±20% SMD,4.2x4.2mm Fixed Inductors RoHS",YES,5,0.4781,2.39,,
+C18723014,X069-9616TSWIG02-H14,Wisevision,,-,"0.69 96x16 SSD1312 chip I2C LCD, OLED, Graphic RoHS",YES,2,1.3337,2.67,,
+C386166,UMK325AB7106KMHP,Taiyo Yuden,,1210,10uF ±10% 50V Ceramic Capacitor X7R 1210 AEC-Q200,YES,25,0.0854,2.14,,
+C38582720,TPA191A4-SC6R,3PEAK,,SOT-363,50uV -300mV~+36V 22uA 2.5V/us 120dB 30kHz 80uA 100V/V SOT-363 Amplifiers RoHS,YES,5,0.53,2.65,,
+C5185587,CUM1206-15FR004,FORT,,1206,1W 4mΩ SMD ±50ppm/℃ Current Sense Resistor ±1% 1206 Current Sense Resistors RoHS,YES,5,0.0522,0.26,,

hw/fabrication-toolkit-options.json

@@ -0,0 +1 @@
+{"ARCHIVE_NAME": "", "EXTRA_LAYERS": "", "ALL_ACTIVE_LAYERS": false, "EXTEND_EDGE_CUT": false, "ALTERNATIVE_EDGE_CUT": false, "AUTO TRANSLATE": true, "AUTO FILL": true, "EXCLUDE DNP": false, "OPEN BROWSER": true, "NO_BACKUP_OPT": false}

hw/footprints/Custom.pretty/USB-C-SMD_U263-163N-4GS1735.kicad_mod

@@ -434,6 +434,12 @@
 			)
 		)
 	)
+	(pad "A1" smd rect
+		(at -3.2 -2.4775)
+		(size 0.5 1.15)
+		(layers "F.Cu" "F.Mask" "F.Paste")
+		(uuid "ea8dadf2-8afa-4fe2-9e30-22206c244069")
+	)
 	(pad "A4" smd rect
 		(at -2.4 -2.4775)
 		(size 0.5 1.15)
@@ -464,6 +470,12 @@
 		(layers "F.Cu" "F.Mask" "F.Paste")
 		(uuid "a621d7b8-8475-4012-bb80-22970594526c")
 	)
+	(pad "B1" smd rect
+		(at 3.2185 -2.4775)
+		(size 0.5 1.15)
+		(layers "F.Cu" "F.Mask" "F.Paste")
+		(uuid "b6f3c56c-8cda-4c18-83e9-de8afa037a13")
+	)
 	(pad "B4" smd rect
 		(at 2.4 -2.4775)
 		(size 0.5 1.15)
@@ -494,18 +506,6 @@
 		(layers "F.Cu" "F.Mask" "F.Paste")
 		(uuid "b669d7b8-13ce-4926-b0fa-a776cf6d1e07")
 	)
-	(pad "GND" smd rect
-		(at -3.2 -2.4775)
-		(size 0.5 1.15)
-		(layers "F.Cu" "F.Mask" "F.Paste")
-		(uuid "ea8dadf2-8afa-4fe2-9e30-22206c244069")
-	)
-	(pad "GND" smd rect
-		(at 3.2185 -2.4775)
-		(size 0.5 1.15)
-		(layers "F.Cu" "F.Mask" "F.Paste")
-		(uuid "b6f3c56c-8cda-4c18-83e9-de8afa037a13")
-	)
 	(pad "S1" thru_hole oval
 		(at -4.32 -1.8025)
 		(size 1.2 2.2)

hw/usbc_soldering_iron.kicad_pro

@@ -3,6 +3,8 @@
     "3dviewports": [],
     "design_settings": {
       "defaults": {
+        "apply_defaults_to_fp_barcodes": false,
+        "apply_defaults_to_fp_dimensions": false,
         "apply_defaults_to_fp_fields": false,
         "apply_defaults_to_fp_shapes": false,
         "apply_defaults_to_fp_text": false,
@@ -48,7 +50,7 @@
         "silk_text_thickness": 0.1,
         "silk_text_upright": false,
         "zones": {
-          "min_clearance": 0.25
+          "min_clearance": 0.2
         }
       },
       "diff_pair_dimensions": [
@@ -77,6 +79,7 @@
         "extra_footprint": "warning",
         "footprint": "error",
         "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_field_mismatch": "warning",
         "footprint_symbol_mismatch": "warning",
         "footprint_type_mismatch": "ignore",
         "hole_clearance": "error",
@@ -94,6 +97,7 @@
         "mirrored_text_on_front_layer": "warning",
         "missing_courtyard": "ignore",
         "missing_footprint": "warning",
+        "missing_tuning_profile": "warning",
         "net_conflict": "warning",
         "nonmirrored_text_on_back_layer": "warning",
         "npth_inside_courtyard": "ignore",
@@ -113,9 +117,12 @@
         "too_many_vias": "error",
         "track_angle": "error",
         "track_dangling": "warning",
+        "track_not_centered_on_via": "ignore",
+        "track_on_post_machined_layer": "error",
         "track_segment_length": "error",
         "track_width": "error",
         "tracks_crossing": "error",
+        "tuning_profile_track_geometries": "ignore",
         "unconnected_items": "error",
         "unresolved_variable": "error",
         "via_dangling": "warning",
@@ -123,7 +130,7 @@
       },
       "rules": {
         "max_error": 0.005,
-        "min_clearance": 0.16,
+        "min_clearance": 0.15,
         "min_connection": 0.16,
         "min_copper_edge_clearance": 0.2,
         "min_groove_width": 0.0,
@@ -131,15 +138,15 @@
         "min_hole_to_hole": 0.25,
         "min_microvia_diameter": 0.2,
         "min_microvia_drill": 0.1,
-        "min_resolved_spokes": 2,
+        "min_resolved_spokes": 1,
         "min_silk_clearance": 0.0,
         "min_text_height": 0.8,
         "min_text_thickness": 0.08,
-        "min_through_hole_diameter": 0.3,
+        "min_through_hole_diameter": 0.2,
         "min_track_width": 0.16,
         "min_via_annular_width": 0.15,
         "min_via_diameter": 0.25,
-        "solder_mask_to_copper_clearance": 0.0,
+        "solder_mask_to_copper_clearance": 0.005,
         "use_height_for_length_calcs": true
       },
       "teardrop_options": [
@@ -229,17 +236,28 @@
       "zones_allow_external_fillets": false
     },
     "ipc2581": {
+      "bom_rev": "",
       "dist": "",
       "distpn": "",
       "internal_id": "",
       "mfg": "",
-      "mpn": ""
+      "mpn": "",
+      "sch_revision": ""
     },
     "layer_pairs": [],
     "layer_presets": [],
     "viewports": []
   },
   "boards": [],
+  "component_class_settings": {
+    "assignments": [],
+    "meta": {
+      "version": 0
+    },
+    "sheet_component_classes": {
+      "enabled": false
+    }
+  },
   "cvpcb": {
     "equivalence_files": []
   },
@@ -429,11 +447,14 @@
       "duplicate_sheet_names": "error",
       "endpoint_off_grid": "warning",
       "extra_units": "error",
+      "field_name_whitespace": "warning",
       "footprint_filter": "ignore",
       "footprint_link_issues": "warning",
       "four_way_junction": "ignore",
       "global_label_dangling": "warning",
+      "ground_pin_not_ground": "warning",
       "hier_label_mismatch": "error",
+      "isolated_pin_label": "warning",
       "label_dangling": "error",
       "label_multiple_wires": "warning",
       "lib_symbol_issues": "warning",
@@ -456,6 +477,7 @@
       "similar_power": "warning",
       "simulation_model_issue": "ignore",
       "single_global_label": "ignore",
+      "stacked_pin_name": "warning",
       "unannotated": "error",
       "unconnected_wire_endpoint": "warning",
       "undefined_netclass": "error",
@@ -476,7 +498,7 @@
     "classes": [
       {
         "bus_width": 12,
-        "clearance": 0.16,
+        "clearance": 0.15,
         "diff_pair_gap": 0.16,
         "diff_pair_via_gap": 0.25,
         "diff_pair_width": 0.2,
@@ -488,13 +510,14 @@
         "priority": 2147483647,
         "schematic_color": "rgba(0, 0, 0, 0.000)",
         "track_width": 0.2,
+        "tuning_profile": "",
         "via_diameter": 0.5,
         "via_drill": 0.2,
         "wire_width": 6
       }
     ],
     "meta": {
-      "version": 4
+      "version": 5
     },
     "net_colors": null,
     "netclass_assignments": null,
@@ -516,6 +539,10 @@
   },
   "schematic": {
     "annotate_start_num": 0,
+    "annotation": {
+      "method": 0,
+      "sort_order": 0
+    },
     "bom_export_filename": "${PROJECTNAME}.csv",
     "bom_fmt_presets": [],
     "bom_fmt_settings": {
@@ -587,6 +614,7 @@
       "sort_asc": true,
       "sort_field": "Reference"
     },
+    "bus_aliases": {},
     "connection_grid_size": 50.0,
     "drawing": {
       "dashed_lines_dash_length_ratio": 12.0,
@@ -594,6 +622,7 @@
       "default_line_thickness": 6.0,
       "default_text_size": 50.0,
       "field_names": [],
+      "hop_over_size_choice": 0,
       "intersheets_ref_own_page": false,
       "intersheets_ref_prefix": "",
       "intersheets_ref_short": false,
@@ -617,6 +646,7 @@
     "net_format_name": "",
     "page_layout_descr_file": "",
     "plot_directory": "",
+    "reuse_designators": true,
     "space_save_all_events": true,
     "spice_current_sheet_as_root": false,
     "spice_external_command": "spice \"%I\"",
@@ -625,13 +655,28 @@
     "spice_save_all_dissipations": false,
     "spice_save_all_voltages": false,
     "subpart_first_id": 65,
-    "subpart_id_separator": 0
+    "subpart_id_separator": 0,
+    "top_level_sheets": [
+      {
+        "filename": "usbc_soldering_iron.kicad_sch",
+        "name": "usbc_soldering_iron",
+        "uuid": "7095b018-eac3-4b01-b374-28e3216c4fd8"
+      }
+    ],
+    "used_designators": "",
+    "variants": []
   },
   "sheets": [
     [
       "7095b018-eac3-4b01-b374-28e3216c4fd8",
-      "Root"
+      "usbc_soldering_iron"
     ]
   ],
-  "text_variables": {}
+  "text_variables": {},
+  "tuning_profiles": {
+    "meta": {
+      "version": 0
+    },
+    "tuning_profiles_impedance_geometric": []
+  }
 }

sim/MMASU32MAB7106_PNA01.asy

@@ -0,0 +1,18 @@
+Version 4
+SymbolType BLOCK
+LINE Normal 64 0 8 0
+LINE Normal -8 16 -8 -16
+LINE Normal 8 16 8 -16
+LINE Normal -8 0 -64 0
+WINDOW 3 0 33 Center 2
+WINDOW 38 0 -33 Center 2
+SYMATTR Value Temperature=25
+SYMATTR SpiceModel MMASU32MAB7106_PNA01
+SYMATTR Prefix X
+SYMATTR ModelFile MMASU32MAB7106_PNA01_LT.cir
+PIN -64 0 NONE 8
+PINATTR PinName Port1
+PINATTR SpiceOrder 1
+PIN 64 0 NONE 8
+PINATTR PinName Port2
+PINATTR SpiceOrder 2

sim/MMASU32MAB7106_PNA01_LT.cir

@@ -0,0 +1,701 @@
+* LTspice Encrypted File
+* 
+* This encrypted file has been supplied by a 3rd
+* party vendor that does not wish to publicize
+* the technology used to implement this library.
+* 
+* Permission is granted to use this file for
+* simulations but not to reverse engineer its
+* contents.
+* 
+* MMASU32MAB7106_PNA01     LTspice Model  ( Temperature / DC Bias Model )
+*--------------------------------------------------------------------------------------------------------
+* Model Generated by TAIYO YUDEN Corporation (https://www.yuden.co.jp/en/)
+* Version 3.0
+* TAIYO YUDEN Control No. 250905
+* Copyright(c) 2021 TAIYO YUDEN CO.,LTD. All Rights Reserved.
+*--------------------------------------------------------------------------------------------------------
+* Product Description (link to TY-COMPAS)
+* https://ds.yuden.co.jp/TYCOMPAS/or/detail?pn=MMASU32MAB7106KPNA01&u=M
+*--------------------------------------------------------------------------------------------------------
+* 
+* Begin:
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 WIRE 752 48 656 48
 WIRE 976 48 752 48
+WIRE -1600 80 -1600 16
+WIRE -1600 80 -1728 80
+WIRE -1600 96 -1600 80
 WIRE 752 96 752 48
-WIRE -1728 128 -1728 48
+WIRE -1728 128 -1728 80
 WIRE 976 128 976 48
 WIRE 96 144 96 48
+WIRE -1600 192 -1600 176
 WIRE 752 208 752 176
 WIRE 848 208 752 208
 WIRE 752 240 752 208
 WIRE 848 256 848 208
+WIRE -1728 272 -1728 192
 WIRE 752 384 752 320
 WIRE 848 384 848 320
 WIRE 976 384 976 192
 FLAG 752 384 0
-FLAG -1600 128 0
+FLAG -1600 272 0
 FLAG 96 224 0
 FLAG -1600 -560 vbus
 FLAG -992 -560 vmid
 FLAG 848 384 0
 FLAG -1680 -416 0
-FLAG -1600 -112 vdrv
-FLAG -1728 128 0
+FLAG -1600 -208 vdrv
+FLAG -1728 272 0
 FLAG 320 0 0
 FLAG 96 -80 cp
 FLAG 96 0 0
@@ -91,17 +94,19 @@ FLAG 976 384 0
 FLAG -800 -320 0
 FLAG 400 -320 0
 FLAG -880 -320 0
+FLAG -1648 -304 0
+FLAG -1840 -160 0
 SYMBOL nmos 704 -208 R0
 SYMATTR InstName M1
 SYMATTR Value AON7140
 SYMBOL res 736 224 R0
 SYMATTR InstName R1
 SYMATTR Value {rtip}
-SYMBOL voltage -1600 32 R0
+SYMBOL voltage -1600 176 R0
 WINDOW 123 0 0 Left 0
 WINDOW 39 24 44 Left 2
 SYMATTR InstName V1
-SYMATTR Value PWL(0 0 1m 0 1.1m {vbus} 10m {vbus} 10.1m 0)
+SYMATTR Value {vbus}
 SYMBOL voltage 96 128 R0
 WINDOW 123 0 0 Left 0
 WINDOW 39 0 0 Left 0
@@ -118,20 +123,20 @@ SYMATTR Value 5m
 SYMBOL cap 832 256 R0
 SYMATTR InstName C4
 SYMATTR Value 10p
-SYMBOL ind -1616 -416 R0
+SYMBOL ind -1616 -192 R0
 SYMATTR InstName L2
 SYMATTR Value 500n
 SYMATTR SpiceLine Rser=1m
-SYMBOL res -1616 -304 R0
+SYMBOL res -1616 -80 R0
 SYMATTR InstName R8
 SYMATTR Value 120m
 SYMBOL cap -1696 -480 R0
 SYMATTR InstName C5
 SYMATTR Value 1µ
-SYMBOL res -1616 -64 R0
+SYMBOL res -1616 80 R0
 SYMATTR InstName R9
 SYMATTR Value 20m
-SYMBOL cap -1744 -16 R0
+SYMBOL cap -1744 128 R0
 SYMATTR InstName C6
 SYMATTR Value 200µ
 SYMBOL IRS10752L 416 -48 R0
@@ -149,15 +154,6 @@ SYMBOL ind 736 80 R0
 SYMATTR InstName L3
 SYMATTR Value 10n
 SYMATTR SpiceLine Rser=1m
-SYMBOL MCASU32MAB7106_PNA01 80 -384 R90
-SYMATTR Value Temperature=40
-SYMATTR InstName U4
-SYMBOL MCASU32MAB7106_PNA01 192 -384 R90
-SYMATTR Value Temperature=40
-SYMATTR InstName U5
-SYMBOL MCASU32MAB7106_PNA01 288 -384 R90
-SYMATTR Value Temperature=40
-SYMATTR InstName U6
 SYMBOL ind -416 -544 R270
 WINDOW 0 32 56 VTop 2
 WINDOW 3 5 56 VBottom 2
@@ -185,19 +181,36 @@ SYMATTR InstName D1
 SYMATTR Value RB068M-60
 SYMBOL Contrib\\CHEMI-CON\\Capacitors\\Alcap-PolymerHybrid-SMD\\HHXC350ARA220ME61G -816 -432 R0
 SYMATTR InstName C2
-SYMBOL MCASU32MAB7106_PNA01 400 -384 R90
+SYMBOL sw -1600 -336 R0
+SYMATTR InstName S1
+SYMATTR Value SW1
+SYMBOL voltage -1840 -256 R0
+SYMATTR InstName V4
+SYMATTR Value PWL(0 0 1m 0 1.1m 1 6m 1 6.1m 0)
+SYMBOL MMASU32MAB7106_PNA01 -880 -400 R90
+SYMATTR Value Temperature=40
+SYMATTR InstName U3
+SYMBOL MMASU32MAB7106_PNA01 80 -384 R90
 SYMATTR Value Temperature=40
 SYMATTR InstName U1
-SYMBOL MCASU32MAB7106_PNA01 -880 -400 R90
+SYMBOL MMASU32MAB7106_PNA01 192 -384 R90
 SYMATTR Value Temperature=40
-SYMATTR InstName U8
+SYMATTR InstName U4
+SYMBOL MMASU32MAB7106_PNA01 288 -384 R90
+SYMATTR Value Temperature=40
+SYMATTR InstName U5
+SYMBOL MMASU32MAB7106_PNA01 400 -384 R90
+SYMATTR Value Temperature=40
+SYMATTR InstName U6
 TEXT -1656 -1016 Left 2 !.tran 12m
 TEXT -1648 -808 Left 2 !.param fsw=100k
 TEXT -1648 -776 Left 2 !.param d={pout/(vbus*vbus/rtip)}
 TEXT -1648 -904 Left 2 !.param vbus=28
 TEXT -1648 -840 Left 2 !.param pout=130
-TEXT -1648 -872 Left 2 !.param rtip=2.5
+TEXT -576 -40 Left 2 !.param rtip=2.5
 TEXT 352 112 Left 2 !.lib IRS10752L.lib
 TEXT -1648 -936 Left 2 !.param vcc=3.3
 TEXT -1656 -992 Left 2 !.options abstol=10n vntol=10n reltol=0.005 gmin=10p method=gear
 TEXT -480 -632 Left 2 !.param L=2.2u Is=7
+TEXT -584 -64 Left 2 !*.step param rtip list 2.5 3 3.5  4.5 5 100k
+TEXT -1496 -16 Left 2 !.model SW1 SW(Ron=1n  Roff=10Meg Vt=0.5 Vh=0.1)