STM32 HAL

// Reads the logical level on a specific GPIO.
GPIO_PinState read_GPIO(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin){
  return HAL_GPIO_ReadPin(GPIOx, GPIO_Pin);
}

// Exemple de détection d’une commande haute sur un joystick
GPIO_PinState sw_up() {
  return read_GPIO(GPIOA, GPIO_PIN_4);
}

extern TIM_HandleTypeDef htim2;
extern TIM_HandleTypeDef htim3;

// Configures PWM with frequency (Hz) and duty cycle (%).
void set_pwm_device (TIM_HandleTypeDef *htim, uint32_t channel, uint32_t freq_hz, uint8_t duty_percent, PWM_SetMode mode){
  switch (mode){
    case PWM_SET_FREQ:
      if (freq_hz == 0)
        return;
      {
        uint32_t timer_clk = HAL_RCC_GetPCLK1Freq () * 2;
        uint32_t arr = (timer_clk / freq_hz) - 1;
        __HAL_TIM_SET_AUTORELOAD (htim, arr);
        htim->Init.Period = arr;

        // Duty fixed at 50
        uint32_t pulse = (arr + 1) / 2;
        __HAL_TIM_SET_COMPARE (htim, channel, pulse);
        HAL_TIM_PWM_Start (htim, channel);
      }
      break;

    case PWM_SET_DUTY:
      {
        uint32_t pulse = (100 - brightness) * (htim->Init.Period + 1) / 100;

        HAL_TIM_PWM_Start (htim, channel);

        switch (brightness){
          case 0:
            __HAL_TIM_SET_COMPARE (htim, channel, htim->Init.Period);
            break;
          case 100:
            __HAL_TIM_SET_COMPARE (htim, channel, 0);
            break;
          default:
            __HAL_TIM_SET_COMPARE (htim, channel, pulse);
            break;
          }
      }
      break;
    }
}
// Example of a red LED setting
void red_led (int8_t brightness){
	set_pwm_device (&htim3, TIM_CHANNEL_1, 0, brightness, PWM_SET_DUTY);
}

// Example of a sound wave emitted by a loudspeaker
void speaker_tone(uint32_t frequency_hz) {
  set_pwm_device(&htim2, TIM_CHANNEL_3, frequency_hz, 0, PWM_SET_FREQ);
}

// To stop the sound
void speaker_off(void) {
  __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_3, 0);
}

extern ADC_HandleTypeDef hadc1;

// Reads the analogue value of a given ADC channel and stores the result in *value.
static void read_adc(uint32_t *value, uint32_t channel)
{
    ADC_ChannelConfTypeDef s_config = {0};

    s_config.Channel = channel;
    s_config.Rank = 1;
    s_config.SamplingTime = ADC_SAMPLETIME_3CYCLES; /* Défini par CubeMX */

    if (HAL_ADC_ConfigChannel(&hadc1, &s_config) != HAL_OK) {
        Error_Handler(); // Error handling if configuration fails
    }

    HAL_ADC_Start(&hadc1); // Starts ADC conversion
    if (HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY) == HAL_OK) {
        *value = HAL_ADC_GetValue(&hadc1); // Récupère la valeur convertie
    }
    HAL_ADC_Stop(&hadc1); // Stops ADC conversion
}

// Example: reading the value of a potentiometer connected to channel ADC_CHANNEL_0.
void pot_1(uint32_t *value_pot)
{
    read_adc(value_pot, ADC_CHANNEL_0);
}