Arduino for STM32

Code: Select all

interrupt routine {
  I1 = read_adc1 result;
  I2 = read_adc2 result;
  start adc1;  // for reading in next interrupt
  start adc2;  
  process results I1, I2;  // processing is significant, decoding position/speed of a stepper motor. 
}

Code: Select all

// stm32duino core API here https://github.com/stm32duino/wiki/wiki/API

#include <Arduino.h>

ADC_HandleTypeDef hadc1;

HardwareTimer *AdcTimer = new HardwareTimer(TIM1);

//  Updated by an interrupt routine. Protect as needed.
static int counter = 0;

void adc_setup(ADC_HandleTypeDef* adc_handle, ADC_TypeDef *adc) {
  adc_handle->Instance = adc;
  adc_handle->Init.DataAlign = ADC_DATAALIGN_RIGHT;
  adc_handle->Init.ScanConvMode = ADC_SCAN_DISABLE;
  adc_handle->Init.ContinuousConvMode = DISABLE;
  adc_handle->Init.NbrOfConversion = 1;
  adc_handle->Init.DiscontinuousConvMode = DISABLE;
  adc_handle->Init.NbrOfDiscConversion = 1;
  adc_handle->Init.ExternalTrigConv = ADC_SOFTWARE_START;
  HAL_StatusTypeDef status = HAL_ADC_Init(adc_handle);
  if (status != HAL_OK ) {
    for(;;) {
      Serial.printf("ADC setup error: %d", status);
      delay(1000);
    }
  }
}

void adc_loop() {
  auto start = micros();
  HAL_ADC_Start(&hadc1);
  HAL_StatusTypeDef status = HAL_ADC_PollForConversion(&hadc1, 100);
  if (status != HAL_OK ) {
    for(;;) {
      Serial.printf("ADC read error: %d", status);
      delay(1000);
    }
  }
  int value = HAL_ADC_GetValue(&hadc1);
  auto end = micros();
  Serial.printf("Adc: %d (%d usec)\n", value, end - start);
}

// Timer interrupt routing. 
void Timer_callback(void) { counter++; }

// Arduino's one time setup.
void setup() {
  // Should be done first, to print setup errors.
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
  adc_setup(&hadc1, ADC1);

  AdcTimer->pause();
  AdcTimer->setOverflow(100000, HERTZ_FORMAT);  // 10 Hz
  AdcTimer->attachInterrupt(Timer_callback);
  AdcTimer->resume();
}

// Arduino's main loop handler.
void loop() {
  adc_loop();
  digitalWrite(LED_BUILTIN, LOW); // LED on
  delay(50); 
  digitalWrite(LED_BUILTIN, HIGH);  // LED off.
  delay(950); 
}