alema/usbc_soldering_iron
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read some adcs

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This commit is contained in:
Alessandro Mauri 2026-04-10 00:58:53 +02:00
parent a75570e67b
commit e1528385c2
2 changed files with 48 additions and 3 deletions
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3
fw/Makefile
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@ -10,3 +10,6 @@ FLASH_COMMAND=$(MINICHLINK)/minichlink -C isp -w $< $(WRITE_SECTION) -b
flash : cv_flash
clean : cv_clean
monitor :
picocom --imap lfcrlf /dev/ttyACM0

48
fw/main.c
View File

@ -4,9 +4,42 @@
#include <string.h>
#include <fsusb.h>
#define PIN_LED PA4
// Pin definitions
#define PIN_LED PA4
#define PIN_VBUS PA0
#define PIN_CURRENT PA1
#define PIN_NTC PA2
// Analog channel definitions
#define VBUS_ADC_CHANNEL ANALOG_0
#define CURRENT_ADC_CHANNEL ANALOG_1
#define NTC_ADC_CHANNEL ANALOG_2
// constants
// LUT for converting NTC readings to degrees kelvin
// Nominal: 1kOhm, Beta: 3380, Step: 64
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
};
uint8_t pin = 0;
int get_temp_k(int adc_reading)
{
if (adc_reading < 0 || 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;
}
// this callback is mandatory when FUNCONF_USE_USBPRINTF is defined,
// can be empty though
void handle_usbfs_input(int numbytes, uint8_t *data)
@ -28,8 +61,14 @@ __attribute__((noreturn)) int main(void)
{
SystemInit();
funGpioInitAll();
funPinMode(PIN_LED, GPIO_CFGLR_OUT_10Mhz_PP);
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_LED, GPIO_CFGLR_OUT_10Mhz_PP);
Delay_Ms(500);
unsigned int count = 0;
@ -37,7 +76,10 @@ __attribute__((noreturn)) int main(void)
for (uint32_t x = 0; true ; x++) {
poll_input(); // usb
if ((x % 100) == 0) {
printf("[%d]: Hello From CH32X035\n", count++);
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);
funDigitalWrite(PIN_LED, pin);
pin = !pin;
}