STM32H753 ADC with DMA

[HugoSTM32]

Hi,

Im new to STM and trying to use ADC with DMA in circular mode but the value of my ADC remains at 0. I also tested it with Polling, which works.

ICache and DCache : Enable

void menu_adc(void)

uint32_t adc_buffer[1];
uint16_t adc0;
uint8_t flag_adc;

void menu_adc(void)
{

	    char buf[30];
    	HAL_ADC_Start_DMA(&hadc1, adc_buffer, 1);
	    while(1){

	    	if (flag_adc == 1)
	    	{
	    		flag_adc =0;
				int len = snprintf(buf, sizeof(buf), "ADC0: %u\r\n", adc0);
				HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, HAL_MAX_DELAY);
				HAL_Delay(200);
	    	}
	        if (HAL_ADC_PollForConversion(&hadc1, 100) == HAL_OK)
	        {
	            uint32_t adc_value = HAL_ADC_GetValue(&hadc1);
	            int len = snprintf(buf, sizeof(buf), "ADC0: %lu\r\n", adc_value);
	            HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, HAL_MAX_DELAY);
	        }

	    }
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
    if(hadc->Instance == ADC1)
    {
        adc0 = adc_buffer[0]; // ADC1_INP0
        flag_adc = 1;
    }
}

Results: 

I am also attaching the IOC so that you can look at the configuration of the ADC and DMA.

thank you

[AScha.3]

Hi,

at first try without D-cache, I-cache ON .  And D-cache OFF.

To see if this is just a problem with the D-cache.

[HugoSTM32]

I disable DCache, that blocked in HAL_ADC_Start_DMA(), it was a problem i found that why i enable ICache and DCache :

I will sent you the whole main.c and its the 

void adc_dma(void) function

[Saket_Om · Accepted solution]

Hello @HugoSTM32,

Please try to invalidate the DCache in HAL_ADC_ConvCpltCallback and HAL_ADC_ConvHalfCpltCallback like in the example below.

STM32CubeH7/Projects/NUCLEO-H743ZI/Examples/ADC/ADC_DMA_Transfer/Src/main.c at master · STMicroelectronics/STM32CubeH7

[HugoSTM32]

Ok thank you, that worked, here my new Callback :

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
    if(hadc->Instance == ADC1)
    {
        SCB_InvalidateDCache_by_Addr((uint32_t*)adc_buffer, sizeof(adc_buffer));
        adc0_dma = adc_buffer[0]; // ADC1_INP0
        flag_adc = 1;

    }
    if(hadc->Instance == ADC2)
    {
    	adc0_it = HAL_ADC_GetValue(hadc);
    	flag_adc = 1;
    }
}

void adc_dma(void)
{
    char buf[30];
	HAL_ADC_Start_DMA(&hadc1, adc_buffer, 1);
    while(1){

    	if (flag_adc == 1)
    	{
    		flag_adc =0;
			int len = snprintf(buf, sizeof(buf), "ADC0: %u\r\n", adc0_dma);
			HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, HAL_MAX_DELAY);
    	}
    }
}

Result :

Have a good day