Hello,
For my project Im checking on a data request by using DMA and UART Idle interrupt. After a few minutes my while loop just stops executing. The code keeps executing the USART1_IRQHandler and doesn't return to the main code anymore. If Im not using DMA this doesn't happen. Does anyone know how this happens and if it can be fixed?
Here a few code snippets:
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 230400;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_RS485Ex_Init(&huart1, UART_DE_POLARITY_HIGH, 10, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE);
HAL_UART_Receive_DMA(&huart1, uart_rx_buffer, 50);
/* USER CODE END USART1_Init 2 */
}
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel2_3_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
}
void USART1_IRQHandler(void) {
if (__HAL_UART_GET_FLAG(&huart1, UART_FLAG_IDLE)) {
__HAL_UART_CLEAR_FLAG(&huart1, UART_FLAG_IDLE);
HAL_GPIO_WritePin(GPIOA,LEDR_Pin,GPIO_PIN_RESET);
HAL_UART_DMAStop(&huart1);
for (uint8_t i = 0; i < 50 - 1; i++) {
if (uart_rx_buffer[i] == 0xAA && uart_rx_buffer[i + 1] == ID) {
TransmitDistance();
uart_rx_buffer[i]=0;
uart_rx_buffer[i+1]=0;
break;
}
}
HAL_UART_Receive_DMA(&huart1, uart_rx_buffer, 50);
}
}
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_I2C1_Init();
MX_USART1_UART_Init();
MX_TIM2_Init();
/* USER CODE BEGIN 2 */
HAL_TIM_Base_Start(&htim2);
uint16_t last=0;
int32_t distance=0;
int32_t distancemm=0;
//uint32_t meter=0;
//uint16_t decimaal=0;
uint16_t startwaarde=0;
//uint32_t i=0;
//Status();
startwaarde = Init();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
CalculateDistance(&distance, &distancemm, &last, startwaarde);
HAL_GPIO_WritePin(GPIOA,LEDR_Pin,GPIO_PIN_SET);
/*if(RequestData()){
//i++;
//DelayUS(150);
//if(i>20)
TransmitDistance(meter, decimaal);
}*/
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
