Here is my main file that sets up DMA for the DAC (my DAC is routed internally to an OPAMP because I have a G474 device).
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_DAC3_Init();
MX_OPAMP3_Init();
MX_TIM3_Init();
MX_TIM6_Init();
/* USER CODE BEGIN 2 */
// 1 10 12
int16_t pData[]={100,200,300,400,500,600,700,800,900,800,700,600,500,400,300,200,0};
int i;
i = HAL_TIM_Base_Start(&htim3);
i = HAL_TIM_Base_Start(&htim6);
i = HAL_DAC_Start(&hdac3, DAC_CHANNEL_2);
// really required ??? //
i = HAL_DMA_Init(&hdma_dac3_ch2);
i = HAL_OPAMP_Start(&hopamp3);
i = HAL_DAC_SetValue(&hdac3, DAC_CHANNEL_2, DAC_ALIGN_12B_R, 0); // see this on scope output
//i = HAL_DAC_SetValue(&hdac3, DAC_CHANNEL_2, DAC_ALIGN_12B_R, 4095); // see this on scope output
//HAL_StatusTypeDef HAL_DAC_Start_DMA(DAC_HandleTypeDef *hdac, uint32_t Channel, uint32_t *pData, uint32_t Length,
// uint32_t Alignment)
i = HAL_DAC_Start_DMA(&hdac3, DAC_CHANNEL_2, (uint32_t *)pData, 16, DAC_ALIGN_12B_R); // gives HAL_OK does nothing
// causes error unsuprisinigly : i = HAL_DAC_Start_DMA(&hdma_dac3_ch2, DAC_CHANNEL_2, (uint32_t *)pData, 10, DAC_ALIGN_12B_R); // gives HAL_OK does nothing
if ( i != HAL_OK ) {
Error_Handler();
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
pData[5]++; // make the 6th in sequence wobbly so as to distingish it from the triangle auto wave generator
if ( pData[5] > 650)
pData[5] = 550;
asm (" nop");
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
