HAL库记录--关于库逻辑的一些理解

STM32_HAL库四种外设处理方式,直接,中断,DMA,等待事件

例如:串口,HAL库函数有如下

/* IO operation functions *******************************************************/
HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size, uint32_t Timeout);
HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);
HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_DMAPause(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_DMAResume(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_DMAStop(UART_HandleTypeDef *huart);

HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint16_t *RxLen,
                                           uint32_t Timeout);
HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);

/* Transfer Abort functions */
HAL_StatusTypeDef HAL_UART_Abort(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_AbortTransmit(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_AbortReceive(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_Abort_IT(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_AbortTransmit_IT(UART_HandleTypeDef *huart);
HAL_StatusTypeDef HAL_UART_AbortReceive_IT(UART_HandleTypeDef *huart);

void HAL_UART_IRQHandler(UART_HandleTypeDef *huart);
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_TxHalfCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxHalfCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart);
void HAL_UART_AbortCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_AbortTransmitCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_AbortReceiveCpltCallback(UART_HandleTypeDef *huart);

void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size);

1.直接的方式

HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size, uint32_t Timeout);
HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);

2.中断的方式

HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);

IT函数在启动数据传输后会立即返回,而数据的实际传输操作是在中断处理函数中完成的。在数据传输完成之后,HAL库将会调用用户定义的回调函数(Callback Function)来通知传输已经完成

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_TxHalfCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxHalfCpltCallback(UART_HandleTypeDef *huart);

3.DMA的方式

HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);

DMA函数在启动数据传输后会立即返回,而数据的实际传输操作是启动DMA传输的。在数据传输完成之后,HAL库将会调用用户定义的回调函数(Callback Function)来通知传输已经完成

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_TxHalfCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);
void HAL_UART_RxHalfCpltCallback(UART_HandleTypeDef *huart);

4.其他方式,事件回调

例如,接受数据 等待 空闲中断事件

HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint16_t *RxLen,
                                           uint32_t Timeout);
HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
HAL_StatusTypeDef HAL_UARTEx_ReceiveToIdle_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);

他的回调函数是

void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size);

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