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more work on basic functions

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This commit is contained in:
Alessandro Mauri 2026-04-10 17:10:30 +02:00
parent e1528385c2
commit 90a94a533b
1 changed files with 71 additions and 23 deletions
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94
fw/main.c
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@ -1,23 +1,31 @@
#include <ch32fun.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <fsusb.h>
// Pin definitions
#define PIN_LED PA4
#define PIN_VBUS PA0
#define PIN_CURRENT PA1
#define PIN_NTC PA2
#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
#define CURRENT_ADC_CHANNEL ANALOG_1
#define NTC_ADC_CHANNEL ANALOG_2
#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
@ -27,32 +35,59 @@ const int16_t ntc_table[64] = {
uint8_t pin = 0;
int get_temp_k(int adc_reading)
// 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 < 0 || adc_reading > 4095) return 0;
if (adc_reading > 4095) return 0;
uint8_t index = adc_reading / ntc_step_size;
uint8_t remainder = adc_reading % ntc_step_size;
if (index > 64) return 0;
int16_t temp_base = ntc_table[index];
int16_t temp_next = ntc_table[index + 1];
int16_t temp_diff = temp_next - temp_base;
int16_t offset = (temp_diff * remainder) / ntc_step_size;
return temp_base + offset;
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;
}
// 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 'b':
printf("HAHAHA\n");
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"
);
break;
default:
printf("Unknown command '%c'\n", data[0]);
break;
}
}
else {
_write(0, (const char*)data, numbytes);
// echo
// _write(0, (const char*)data, numbytes);
}
}
@ -67,7 +102,17 @@ __attribute__((noreturn)) int main(void)
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_ENC_A, GPIO_CFGLR_IN_PUPD);
funPinMode(PIN_ENC_B, GPIO_CFGLR_IN_PUPD);
funPinMode(PIN_BTN, GPIO_CFGLR_IN_FLOAT);
Delay_Ms(500);
@ -76,10 +121,13 @@ __attribute__((noreturn)) int main(void)
for (uint32_t x = 0; true ; x++) {
poll_input(); // usb
if ((x % 100) == 0) {
int vbus_mv = (funAnalogRead(VBUS_ADC_CHANNEL)*3300*11)/4095;
int current_ma = (funAnalogRead(CURRENT_ADC_CHANNEL)*3300)/4095;
int temp_k = get_temp_k(funAnalogRead(NTC_ADC_CHANNEL));
printf("[%d]: Hello From CH32X035, VBUS=%d, CURRENT=%d, TEMP=%d\n", count++, vbus_mv, current_ma, temp_k);
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\n", count++, vbus_mv, current_ma, temp_k, temp_tip_k);
funDigitalWrite(PIN_LED, pin);
pin = !pin;
}