USART HAL module driver. This file provides firmware functions to manage the following functionalities of the Universal Synchronous/Asynchronous Receiver Transmitter Peripheral (USART). More...

#include "stm32h7xx_hal.h"

Detailed Description

USART HAL module driver. This file provides firmware functions to manage the following functionalities of the Universal Synchronous/Asynchronous Receiver Transmitter Peripheral (USART).

Author

MCD Application Team

Initialization and de-initialization functions
IO operation functions
Peripheral Control functions
Peripheral State and Error functions

Attention

This software is licensed under terms that can be found in the LICENSE file in the root directory of this software component. If no LICENSE file comes with this software, it is provided AS-IS.

===============================================================================
                       ##### How to use this driver #####
===============================================================================
   [..]
     The USART HAL driver can be used as follows:

     (#) Declare a USART_HandleTypeDef handle structure (eg. USART_HandleTypeDef husart).
     (#) Initialize the USART low level resources by implementing the HAL_USART_MspInit() API:
         (++) Enable the USARTx interface clock.
         (++) USART pins configuration:
           (+++) Enable the clock for the USART GPIOs.
           (+++) Configure these USART pins as alternate function pull-up.
         (++) NVIC configuration if you need to use interrupt process (HAL_USART_Transmit_IT(),
               HAL_USART_Receive_IT() and HAL_USART_TransmitReceive_IT() APIs):
           (+++) Configure the USARTx interrupt priority.
           (+++) Enable the NVIC USART IRQ handle.
           (++) USART interrupts handling:
             -@@-   The specific USART interrupts (Transmission complete interrupt,
                 RXNE interrupt and Error Interrupts) will be managed using the macros
                 __HAL_USART_ENABLE_IT() and __HAL_USART_DISABLE_IT() inside the transmit and receive process.
         (++) DMA Configuration if you need to use DMA process (HAL_USART_Transmit_DMA()
              HAL_USART_Receive_DMA() and HAL_USART_TransmitReceive_DMA() APIs):
           (+++) Declare a DMA handle structure for the Tx/Rx channel.
           (+++) Enable the DMAx interface clock.
           (+++) Configure the declared DMA handle structure with the required Tx/Rx parameters.
           (+++) Configure the DMA Tx/Rx channel.
           (+++) Associate the initialized DMA handle to the USART DMA Tx/Rx handle.
           (+++) Configure the priority and enable the NVIC for the transfer
                 complete interrupt on the DMA Tx/Rx channel.

     (#) Program the Baud Rate, Word Length, Stop Bit, Parity, and Mode
         (Receiver/Transmitter) in the husart handle Init structure.

     (#) Initialize the USART registers by calling the HAL_USART_Init() API:
         (++) This API configures also the low level Hardware GPIO, CLOCK, CORTEX...etc)
              by calling the customized HAL_USART_MspInit(&husart) API.

   [..]
    (@) To configure and enable/disable the USART to wake up the MCU from stop mode, resort to UART API's
       HAL_UARTEx_StopModeWakeUpSourceConfig(), HAL_UARTEx_EnableStopMode() and
       HAL_UARTEx_DisableStopMode() in casting the USART handle to UART type UART_HandleTypeDef.

   ##### Callback registration #####
   ==================================

   [..]
   The compilation define USE_HAL_USART_REGISTER_CALLBACKS when set to 1
   allows the user to configure dynamically the driver callbacks.

   [..]
   Use Function HAL_USART_RegisterCallback() to register a user callback.
   Function HAL_USART_RegisterCallback() allows to register following callbacks:
   (+) TxHalfCpltCallback        : Tx Half Complete Callback.
   (+) TxCpltCallback            : Tx Complete Callback.
   (+) RxHalfCpltCallback        : Rx Half Complete Callback.
   (+) RxCpltCallback            : Rx Complete Callback.
   (+) TxRxCpltCallback          : Tx Rx Complete Callback.
   (+) ErrorCallback             : Error Callback.
   (+) AbortCpltCallback         : Abort Complete Callback.
   (+) RxFifoFullCallback        : Rx Fifo Full Callback.
   (+) TxFifoEmptyCallback       : Tx Fifo Empty Callback.
   (+) MspInitCallback           : USART MspInit.
   (+) MspDeInitCallback         : USART MspDeInit.
   This function takes as parameters the HAL peripheral handle, the Callback ID
   and a pointer to the user callback function.

   [..]
   Use function HAL_USART_UnRegisterCallback() to reset a callback to the default
   weak (surcharged) function.
   HAL_USART_UnRegisterCallback() takes as parameters the HAL peripheral handle,
   and the Callback ID.
   This function allows to reset following callbacks:
   (+) TxHalfCpltCallback        : Tx Half Complete Callback.
   (+) TxCpltCallback            : Tx Complete Callback.
   (+) RxHalfCpltCallback        : Rx Half Complete Callback.
   (+) RxCpltCallback            : Rx Complete Callback.
   (+) TxRxCpltCallback          : Tx Rx Complete Callback.
   (+) ErrorCallback             : Error Callback.
   (+) AbortCpltCallback         : Abort Complete Callback.
   (+) RxFifoFullCallback        : Rx Fifo Full Callback.
   (+) TxFifoEmptyCallback       : Tx Fifo Empty Callback.
   (+) MspInitCallback           : USART MspInit.
   (+) MspDeInitCallback         : USART MspDeInit.

   [..]
   By default, after the HAL_USART_Init() and when the state is HAL_USART_STATE_RESET
   all callbacks are set to the corresponding weak (surcharged) functions:
   examples HAL_USART_TxCpltCallback(), HAL_USART_RxHalfCpltCallback().
   Exception done for MspInit and MspDeInit functions that are respectively
   reset to the legacy weak (surcharged) functions in the HAL_USART_Init()
   and HAL_USART_DeInit() only when these callbacks are null (not registered beforehand).
   If not, MspInit or MspDeInit are not null, the HAL_USART_Init() and HAL_USART_DeInit()
   keep and use the user MspInit/MspDeInit callbacks (registered beforehand).

   [..]
   Callbacks can be registered/unregistered in HAL_USART_STATE_READY state only.
   Exception done MspInit/MspDeInit that can be registered/unregistered
   in HAL_USART_STATE_READY or HAL_USART_STATE_RESET state, thus registered (user)
   MspInit/DeInit callbacks can be used during the Init/DeInit.
   In that case first register the MspInit/MspDeInit user callbacks
   using HAL_USART_RegisterCallback() before calling HAL_USART_DeInit()
   or HAL_USART_Init() function.

   [..]
   When The compilation define USE_HAL_USART_REGISTER_CALLBACKS is set to 0 or
   not defined, the callback registration feature is not available
   and weak (surcharged) callbacks are used.