STM32L4 UART DMA TX Callback not called Posted on June 15, 2017 at 13:00
Dear community,
I used CubeMX to setup a project for UART DMA transfers RX and TX. Apart from my protocol logic, I added two callbacks:
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
rx_cplt=true;
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *UartHandle)
{
tx_cplt=true;
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?
and start transfers with calls to
HAL_UART_Receive_DMA(&huart2, (uint8_t *)buf, len);
HAL_UART_Transmit_DMA(&huart2, (uint8_t *)x, len)�?�?�?�?
Both work fine in the sense that the data is transmitted, as I can see from logic analyzer and host side. But the problem is, that only the Rx Callback is called after transfer has finished.
I walked through the source code with debugger and found that the interrupt for TX complete is actually triggered, but the callback function is never called from HAL implementation. I checked the file 'stm32l4xx_hal_uart.c' and found the following function, which is called aft
