HAL_UARTEx_ReceiveToIdle_DMA repeating same data I am currently using HAL_UARTEx_ReceiveToIdle_DMA and getting results that don't make sense to me. My main function is very simple: int main() {
MX_DMA_Init();
MX_UART4_Init();
HAL_UARTEx_ReceiveToIdle_DMA(&huart4, rxDmaBuffer, sizeof(rxDmaBuffer));
__HAL_DMA_DISABLE_IT(&hdma_uart4_rx, DMA_IT_HT);
while (true) {
if (tcpToSendQueue.size() > 0) {
size_t length = tcpToSendQueue.front();
tcpToSendQueue.dequeue();
fwrite(tcpToSendBuffer, length, 1, stdout);
}
ThisThread::sleep_for(5ms);
}
} And my HAL_UARTEx_RxEventCallback is also minimal. void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef* huart, uint16_t size) {
if (huart->Instance == UART4) {
std::memcpy(tcpToSendBuffer, rxDmaBuffer, size);
tcpToSendQueue.enqueue(size);
HAL_UARTEx_ReceiveToIdle_DMA(&huart4, rxDmaBuffer, sizeof(rxDmaBuffer));
__HAL_DMA_DISABLE_IT(&hdma_uart4_rx, DMA_IT_HT);
}
} I am receiving ASCII data at 5Hz to test, and the very first message is coming
