I am trying USART communication with using DMA. Code written with HAL library is working on STM32F0 but it doesn't work on L0. I am getting irrelevant data at terminal.
Also HAL_UARTEx_RxEventCallback function can called on F0 but not on L0.
Here is the some of my code.
Where I am wrong ?
/* USER CODE BEGIN PV */
#define RxBuf_SIZE 10
#define MainBuf_SIZE 10
char TxBuffer[4]={0x12,0x34,0x56,0x78};
uint8_t RxBuffer[RxBuf_SIZE],MainBuf[MainBuf_SIZE];
char str[24];
int sayi=0;
uint16_t oldPos = 0;
uint16_t newPos = 0;
int isOK = 0;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void HAL_UART_TxHalfCpltCallback(UART_HandleTypeDef *huart)
{
__NOP();
}
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
if (huart->Instance == USART1)
{
oldPos = newPos; // Update the last position before copying new data
/* If the data in large and it is about to exceed the buffer size, we have to route it to the start of the buffer
* This is to maintain the circular buffer
* The old data in the main buffer will be overlapped
*/
if (oldPos+Size > MainBuf_SIZE) // If the current position + new data size is greater than the main buffer
{
uint16_t datatocopy = MainBuf_SIZE-oldPos; // find out how much space is left in the main buffer
memcpy ((uint8_t *)MainBuf+oldPos, RxBuffer, datatocopy); // copy data in that remaining space
oldPos = 0; // point to the start of the buffer
memcpy ((uint8_t *)MainBuf, (uint8_t *)RxBuffer+datatocopy, (Size-datatocopy)); // copy the remaining data
newPos = (Size-datatocopy); // update the position
}
/* if the current position + new data size is less than the main buffer
* we will simply copy the data into the buffer and update the position
*/
else
{
memcpy ((uint8_t *)MainBuf+oldPos, RxBuffer, Size);
newPos = Size+oldPos;
}
for(int i=Size;i<RxBuf_SIZE;i++)
RxBuffer[i]=0;
/* start the DMA again */
HAL_UARTEx_ReceiveToIdle_DMA(&huart1, (uint8_t *) RxBuffer, RxBuf_SIZE);
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx, DMA_IT_HT);
}
/* USER CODE BEGIN 2 */
HAL_UART_Transmit_DMA(&huart1,(uint8_t*)TxBuffer,sizeof(TxBuffer));
HAL_UARTEx_ReceiveToIdle_DMA(&huart1, RxBuffer, RxBuf_SIZE);
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx, DMA_IT_HT);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_UART_Transmit_DMA(&huart1,(uint8_t*)TxBuffer,sizeof(TxBuffer));
HAL_Delay(20);
}
/* USER CODE END 3 */
