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interrupt-based encoder

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This commit is contained in:
Alessandro Mauri 2026-04-11 21:40:33 +02:00
parent 90a94a533b
commit 9e254e0fb1
2 changed files with 34 additions and 3 deletions
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1
fw/funconfig.h
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@ -4,5 +4,6 @@
#define FUNCONF_USE_DEBUGPRINTF 0 // can only have one printf
#define FUNCONF_USE_USBPRINTF 1
#define FUNCONF_DEBUG_HARDFAULT 0
#define CH32X035 1
#endif

36
fw/main.c
View File

@ -33,6 +33,9 @@ const int16_t ntc_table[64] = {
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,
@ -92,6 +95,23 @@ void handle_usbfs_input(int numbytes, uint8_t *data)
}
// 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();
@ -110,10 +130,20 @@ __attribute__((noreturn)) int main(void)
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_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);
// 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;
@ -126,7 +156,7 @@ __attribute__((noreturn)) int main(void)
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);
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;