Solved
STM32 dual channel ADC
I am trying to read ADC from two channels without using DMA. For that I use this code:
/* USER CODE BEGIN 0 */
uint16_t ADC_VAL[2];
void ADC_Select_CH1(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
void ADC_Select_CH2(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_ADC1_Init();
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//1st channel ADC conversion
ADC_Select_CH1();
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 1000);
ADC_VAL[0] = HAL_ADC_GetValue(&hadc1);
HAL_ADC_Stop(&hadc1);
//2nd channel ADC conversion
ADC_Select_CH2();
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 1000);
ADC_VAL[1] = HAL_ADC_GetValue(&hadc1);
HAL_ADC_Stop(&hadc1);
}
/* USER CODE END 3 */
}
This code works perfectly for NUCLEO-L433RC-P and NUCLEO-L476RG, but it doesn't work on NUCLEO-F103RB. I would like to know why is that. On F103RB board first ADC channel shows correct readings and second channel just shows the same value as first channel.