Question
How to setup STM32F373 SDADC with multiple channels over DMA
I am struggling with the SDADC of the STM32F373
My goal is to read 3 different channels of the SDADC3 using DMA. I was able to get a single channel working, but as soon as I add the other channels, the data seems not to be ok.
I used the following code to initialise SDADC3:
static uint32_t sadc3_buf[3];
void HAL_SDADC_MspInit(SDADC_HandleTypeDef* sdadcHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(sdadcHandle->Instance==SDADC3)
{
/* USER CODE BEGIN SDADC3_MspInit 0 */
/* USER CODE END SDADC3_MspInit 0 */
/* SDADC3 clock enable */
__HAL_RCC_SDADC3_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
/**SDADC3 GPIO Configuration
PB14 ------> SDADC3_AIN8P
PB15 ------> SDADC3_AIN7P
PD8 ------> SDADC3_AIN6P
*/
GPIO_InitStruct.Pin = UI3_1_Pin|UI2_1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_InitStruct.Pin = UI1_1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(UI1_1_GPIO_Port, &GPIO_InitStruct);
/* SDADC3 DMA Init */
/* SDADC3 Init */
hdma_sdadc3.Instance = DMA2_Channel5;
hdma_sdadc3.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sdadc3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdadc3.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdadc3.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_sdadc3.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_sdadc3.Init.Mode = DMA_NORMAL;
hdma_sdadc3.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_sdadc3) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(sdadcHandle,hdma,hdma_sdadc3);
/* USER CODE BEGIN SDADC3_MspInit 1 */
/* USER CODE END SDADC3_MspInit 1 */
}
}
void MX_SDADC3_Init(void)
{
/* USER CODE BEGIN SDADC3_Init 0 */
// MX_SDADC3_Init_Celsius();
// return;
/* USER CODE END SDADC3_Init 0 */
SDADC_ConfParamTypeDef ConfParamStruct = {0};
/* USER CODE BEGIN SDADC3_Init 1 */
/* USER CODE END SDADC3_Init 1 */
/** Configure the SDADC low power mode, fast conversion mode,
slow clock mode and SDADC1 reference voltage
*/
hsdadc3.Instance = SDADC3;
hsdadc3.Init.IdleLowPowerMode = SDADC_LOWPOWER_NONE;
hsdadc3.Init.FastConversionMode = SDADC_FAST_CONV_DISABLE;
hsdadc3.Init.SlowClockMode = SDADC_SLOW_CLOCK_DISABLE;
hsdadc3.Init.ReferenceVoltage = SDADC_VREF_VREFINT1;
if (HAL_SDADC_Init(&hsdadc3) != HAL_OK)
{
Error_Handler();
}
/** Configure The Regular Mode
*/
if (HAL_SDADC_SelectRegularTrigger(&hsdadc3, SDADC_SOFTWARE_TRIGGER) != HAL_OK)
{
Error_Handler();
}
/** Set parameters for SDADC configuration 0 Register
*/
ConfParamStruct.InputMode = SDADC_INPUT_MODE_SE_OFFSET;
ConfParamStruct.Gain = SDADC_GAIN_1;
ConfParamStruct.CommonMode = SDADC_COMMON_MODE_VDDA;
ConfParamStruct.Offset = 0;
if (HAL_SDADC_PrepareChannelConfig(&hsdadc3, SDADC_CONF_INDEX_0, &ConfParamStruct) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SDADC3_Init 2 */
if (HAL_SDADC_AssociateChannelConfig(&hsdadc3, SDADC_CHANNEL_6, SDADC_CONF_INDEX_0) != HAL_OK)
{
Error_Handler();
}
if (HAL_SDADC_ConfigChannel(&hsdadc3, SDADC_CHANNEL_6, SDADC_CONTINUOUS_CONV_ON) != HAL_OK)
{
Error_Handler();
}
if (HAL_SDADC_AssociateChannelConfig(&hsdadc3, SDADC_CHANNEL_7, SDADC_CONF_INDEX_0) != HAL_OK)
{
Error_Handler();
}
if (HAL_SDADC_ConfigChannel(&hsdadc3, SDADC_CHANNEL_7, SDADC_CONTINUOUS_CONV_ON) != HAL_OK)
{
Error_Handler();
}
if (HAL_SDADC_AssociateChannelConfig(&hsdadc3, SDADC_CHANNEL_8, SDADC_CONF_INDEX_0) != HAL_OK)
{
Error_Handler();
}
if (HAL_SDADC_ConfigChannel(&hsdadc3, SDADC_CHANNEL_8, SDADC_CONTINUOUS_CONV_ON) != HAL_OK)
{
Error_Handler();
}
/* USER CODE END SDADC3_Init 2 */
}
HAL_StatusTypeDef start_ad_conversion(uint8_t number)
{
HAL_StatusTypeDef result = 0;
result = HAL_SDADC_Start_DMA(&hsdadc3, &sadc3_buf[0],3);
return result;
}