137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
#include <ch32fun.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <fsusb.h>
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// Pin definitions
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#define PIN_LED PA4 // debug led
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#define PIN_VBUS PA0 // vbus voltage feedback
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#define PIN_CURRENT PA1 // current feedback
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#define PIN_NTC PA2 // ntc temperature sensor
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#define PIN_TEMP PA3 // thermocouple amplifier
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#define PIN_12V PA5 // 12V regulator enable
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#define PIN_HEATER PA6 // power mosfet gate control
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#define PIN_ENC_A PB3 // rotary encoder A
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#define PIN_ENC_B PB11 // rotary encoder B
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#define PIN_BTN PB1 // rotary encoder button
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// Analog channel definitions
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#define VBUS_ADC_CHANNEL ANALOG_0 // PA0
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#define CURRENT_ADC_CHANNEL ANALOG_1 // PA1
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#define NTC_ADC_CHANNEL ANALOG_2 // PA2
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#define TEMP_ADC_CHANNEL ANALOG_3 // PA3
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// constants
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// LUT for converting NTC readings to degrees kelvin
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// Nominal: 1kOhm, Beta: 3380, Step: 64
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// TODO: Since the board temperature is almost always in the 300-200K range add
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// more steps in order to better represent that interval
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const uint8_t ntc_step_size = 64;
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const int16_t ntc_table[64] = {
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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
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};
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uint8_t pin = 0;
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// Convert the raw adc reading to a temperature in kelvin with the ntc lut,
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// linearly interpolating between positions
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static inline int16_t get_temp_k(uint16_t adc_reading)
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{
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if (adc_reading > 4095) return 0;
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uint8_t index = adc_reading / ntc_step_size;
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uint8_t remainder = adc_reading % ntc_step_size;
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int16_t temp_base = index < 64 ? ntc_table[index] : 0;
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int16_t temp_next = index < 63 ? ntc_table[index + 1] : temp_base;
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return temp_base + ((temp_next - temp_base) * remainder)/ntc_step_size;
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}
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// convert the raw tip reading from the adc to a temperature in kelvin
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static inline int16_t get_tip_temp_k(uint16_t adc_reading, int16_t cold_temp_k)
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{
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return 0;
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}
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// this callback is mandatory when FUNCONF_USE_USBPRINTF is defined,
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// can be empty though
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void handle_usbfs_input(int numbytes, uint8_t *data)
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{
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// handle single character commands
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// TODO:
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// - 'c' to calibrate the tip temperature
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// - 't' to test tip presence
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if(numbytes == 1) {
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switch(data[0]) {
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case 'r': // toggle the 12V regulator
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if (funDigitalRead(PIN_12V)) {
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funDigitalWrite(PIN_12V, 0);
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printf("Disabled 12V Regulator\n");
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} else {
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funDigitalWrite(PIN_12V, 1);
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printf("Enabled 12V Regulator\n");
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}
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break;
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case 'h':
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printf(
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"Available commands:\n"
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"\tr : toggle the 12V regulator\n"
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);
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break;
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default:
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printf("Unknown command '%c'\n", data[0]);
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break;
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}
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}
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else {
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// echo
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// _write(0, (const char*)data, numbytes);
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}
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}
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__attribute__((noreturn)) int main(void)
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{
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SystemInit();
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funGpioInitAll();
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funAnalogInit();
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USBFSSetup();
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funPinMode(PIN_VBUS, GPIO_CFGLR_IN_ANALOG);
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funPinMode(PIN_CURRENT, GPIO_CFGLR_IN_ANALOG);
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funPinMode(PIN_NTC, GPIO_CFGLR_IN_ANALOG);
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funPinMode(PIN_TEMP, GPIO_CFGLR_IN_ANALOG);
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funPinMode(PIN_LED, GPIO_CFGLR_OUT_10Mhz_PP);
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funPinMode(PIN_12V, GPIO_CFGLR_OUT_10Mhz_PP);
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funDigitalWrite(PIN_12V, 0);
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funPinMode(PIN_HEATER, GPIO_CFGLR_OUT_10Mhz_PP);
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funDigitalWrite(PIN_HEATER, 0);
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funPinMode(PIN_ENC_A, GPIO_CFGLR_IN_PUPD);
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funPinMode(PIN_ENC_B, GPIO_CFGLR_IN_PUPD);
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funPinMode(PIN_BTN, GPIO_CFGLR_IN_FLOAT);
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Delay_Ms(500);
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unsigned int count = 0;
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for (uint32_t x = 0; true ; x++) {
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poll_input(); // usb
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if ((x % 100) == 0) {
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uint16_t vbus_mv = (funAnalogRead(VBUS_ADC_CHANNEL)*3300*11)/4095;
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uint16_t current_ma = ((uint32_t)funAnalogRead(CURRENT_ADC_CHANNEL) * 4125 + 1024) / 2048;
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int16_t temp_k = get_temp_k(funAnalogRead(NTC_ADC_CHANNEL));
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uint16_t temp_tip_k = funAnalogRead(TEMP_ADC_CHANNEL);
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printf("[%d]: VBUS=%d, CURRENT=%d, TEMP=%d, TIP=%d\n", count++, vbus_mv, current_ma, temp_k, temp_tip_k);
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funDigitalWrite(PIN_LED, pin);
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pin = !pin;
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}
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Delay_Ms(1);
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}
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}
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