Posted on November 02, 2015 at 12:53STM32CubeMX V4.11
STM32Cube FW_F4 V1.9.0
/**
******************************************************************************
* @file stm32f4xx_hal_uart.c
* @author MCD Application Team
* @version V1.4.1
* @date 09-October-2015
* @brief UART HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of the Universal Asynchronous Receiver Transmitter (UART) peripheral:
* + Initialization and de-initialization functions
* + IO operation functions
* + Peripheral Control functions
* + Peripheral State and Errors functions
*
@verbatim
.......
/**
* @brief DMA UART transmit process complete callback.
* @param hdma: DMA handle
* @retval None
*/
static void UART_DMATransmitCplt(DMA_HandleTypeDef *hdma)
{
UART_HandleTypeDef* huart = ( UART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
/* DMA Normal mode*/
if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0)
{
huart->TxXferCount = 0;
/* Disable the DMA transfer for transmit request by setting the DMAT bit
in the UART CR3 register */
huart->Instance->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DMAT);
/* Enable the UART Transmit Complete Interrupt */
__HAL_UART_ENABLE_IT(huart, UART_IT_TC);
}
/* DMA Circular mode */
else
{
HAL_UART_TxCpltCallback(huart);
}
}
very similar to that lacks the following code fragment:
if(huart->State == HAL_UART_STATE_BUSY_TX_RX)
{
huart->State = HAL_UART_STATE_BUSY_RX;
}
else
{
huart->State = HAL_UART_STATE_READY;
}
as in
/**
* @brief DMA UART receive process complete callback.
* @param hdma: DMA handle
* @retval None
*/
static void UART_DMAReceiveCplt(DMA_HandleTypeDef *hdma)
{
UART_HandleTypeDef* huart = ( UART_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
/* DMA Normal mode*/
if((hdma->Instance->CR & DMA_SxCR_CIRC) == 0)
{
huart->RxXferCount = 0;
/* Disable the DMA transfer for the receiver request by setting the DMAR bit
in the UART CR3 register */
huart->Instance->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DMAR);
/* Check if a transmit process is ongoing or not */
if(huart->State == HAL_UART_STATE_BUSY_TX_RX)
{
huart->State = HAL_UART_STATE_BUSY_TX;
}
else
{
huart->State = HAL_UART_STATE_READY;
}
}
HAL_UART_RxCpltCallback(huart);
}
