Posted on April 23, 2015 at 12:22I have an idea how uart reception can be done using the new HAL api without tampering the generated files.
Start by creating a receive buffer in two halfs. The receive interrupt will toggle between the first and the second half.
#define UART_RX_FIFO_SIZE 32
unsigned char Uart1RxFifo[UART_RX_FIFO_SIZE+UART_RX_FIFO_SIZE];
uint16_t Uart1CurrFifo = 0;
Write the uart interrupt callback routines:
/*** Uart call backs ***/
/**
* HAL_UART_RxCpltCallback. Uart receive complete call back
* \param huart Handle/pointer to uart
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef * huart) {
/* Toggle between first and second half of rx fifo */
if (Uart1CurrFifo == 0) {
HAL_UART_Receive_IT(huart,&Uart1RxFifo[UART_RX_FIFO_SIZE],UART_RX_FIFO_SIZE);
Uart1CurrFifo = 1;
}
else {
HAL_UART_Receive_IT(huart,&Uart1RxFifo[0],UART_RX_FIFO_SIZE);
Uart1CurrFifo = 0;
}
}
/**
* HAL_UART_ErrorCallback. Uart error call back
* \param huart Handle/pointer to uart
*/
void HAL_UART_ErrorCallback(UART_HandleTypeDef * huart) {
/* Check errorcode */
if (huart->ErrorCode != HAL_UART_ERROR_NONE) {
/* Clear errorcode */
huart->ErrorCode = HAL_UART_ERROR_NONE;
}
}
In the main loop call a uart receive function that reads the content of the RX fifo:
void UartReceive(void) {
static uint8_t * pRxBuffPtr;
static int UartInit=0;
unsigned char Ch;
if (!UartInit) {
HAL_UART_Receive_IT(&huart1,&Uart1RxFifo[0],UART_RX_FIFO_SIZE);
pRxBuffPtr = &Uart1RxFifo[0];
UartInit = 1;
}
/* Check if new data has arrived */
while (pRxBuffPtr != huart1.pRxBuffPtr) {
Ch = *pRxBuffPtr;
/*** Handle received data here ***/
pRxBuffPtr++;
if (pRxBuffPtr == Uart1RxFifo + sizeof(Uart1RxFifo)) {
pRxBuffPtr = &Uart1RxFifo[0];
}
}
}
main(void) {
...
...
while (1) {
....
....
UartReceive();
....
....
}
}
Rgds,
Niels
