stm32g4xx_hal_uart_ex.c

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/**
  ******************************************************************************
  * @file    stm32g4xx_hal_uart_ex.c
  * @author  MCD Application Team
  * @brief   Extended UART HAL module driver.
  *          This file provides firmware functions to manage the following extended
  *          functionalities of the Universal Asynchronous Receiver Transmitter Peripheral (UART).
  *           + Initialization and de-initialization functions
  *           + Peripheral Control functions
  *
  *
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2019 STMicroelectronics.
  * All rights reserved.
  *
  * 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.
  *
  ******************************************************************************
  @verbatim
  ==============================================================================
               ##### UART peripheral extended features  #####
  ==============================================================================
  [..]
    (#) Declare a UART_HandleTypeDef handle structure.

    (#) For the UART RS485 Driver Enable mode, initialize the UART registers
        by calling the HAL_RS485Ex_Init() API.

    (#) FIFO mode enabling/disabling and RX/TX FIFO threshold programming.

        -@- When UART operates in FIFO mode, FIFO mode must be enabled prior
            starting RX/TX transfers. Also RX/TX FIFO thresholds must be
            configured prior starting RX/TX transfers.

  @endverbatim
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32g4xx_hal.h"

/** @addtogroup STM32G4xx_HAL_Driver
  * @{
  */

/** @defgroup UARTEx UARTEx
  * @brief UART Extended HAL module driver
  * @{
  */

#ifdef HAL_UART_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup UARTEX_Private_Constants UARTEx Private Constants
  * @{
  */
/* UART RX FIFO depth */
#define RX_FIFO_DEPTH 8U

/* UART TX FIFO depth */
#define TX_FIFO_DEPTH 8U
/**
  * @}
  */

/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup UARTEx_Private_Functions UARTEx Private Functions
  * @{
  */
static void UARTEx_Wakeup_AddressConfig(UART_HandleTypeDef *huart, UART_WakeUpTypeDef WakeUpSelection);
static void UARTEx_SetNbDataToProcess(UART_HandleTypeDef *huart);
/**
  * @}
  */

/* Exported functions --------------------------------------------------------*/

/** @defgroup UARTEx_Exported_Functions  UARTEx Exported Functions
  * @{
  */

/** @defgroup UARTEx_Exported_Functions_Group1 Initialization and de-initialization functions
  * @brief    Extended Initialization and Configuration Functions
  *
@verbatim
===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..]
    This subsection provides a set of functions allowing to initialize the USARTx or the UARTy
    in asynchronous mode.
      (+) For the asynchronous mode the parameters below can be configured:
        (++) Baud Rate
        (++) Word Length
        (++) Stop Bit
        (++) Parity: If the parity is enabled, then the MSB bit of the data written
             in the data register is transmitted but is changed by the parity bit.
        (++) Hardware flow control
        (++) Receiver/transmitter modes
        (++) Over Sampling Method
        (++) One-Bit Sampling Method
      (+) For the asynchronous mode, the following advanced features can be configured as well:
        (++) TX and/or RX pin level inversion
        (++) data logical level inversion
        (++) RX and TX pins swap
        (++) RX overrun detection disabling
        (++) DMA disabling on RX error
        (++) MSB first on communication line
        (++) auto Baud rate detection
    [..]
    The HAL_RS485Ex_Init() API follows the UART RS485 mode configuration
     procedures (details for the procedures are available in reference manual).

@endverbatim

  Depending on the frame length defined by the M1 and M0 bits (7-bit,
  8-bit or 9-bit), the possible UART formats are listed in the
  following table.

    Table 1. UART frame format.
    +-----------------------------------------------------------------------+
    |  M1 bit |  M0 bit |  PCE bit  |             UART frame                |
    |---------|---------|-----------|---------------------------------------|
    |    0    |    0    |    0      |    | SB |    8 bit data   | STB |     |
    |---------|---------|-----------|---------------------------------------|
    |    0    |    0    |    1      |    | SB | 7 bit data | PB | STB |     |
    |---------|---------|-----------|---------------------------------------|
    |    0    |    1    |    0      |    | SB |    9 bit data   | STB |     |
    |---------|---------|-----------|---------------------------------------|
    |    0    |    1    |    1      |    | SB | 8 bit data | PB | STB |     |
    |---------|---------|-----------|---------------------------------------|
    |    1    |    0    |    0      |    | SB |    7 bit data   | STB |     |
    |---------|---------|-----------|---------------------------------------|
    |    1    |    0    |    1      |    | SB | 6 bit data | PB | STB |     |
    +-----------------------------------------------------------------------+

  * @{
  */

/**
  * @brief Initialize the RS485 Driver enable feature according to the specified
  *         parameters in the UART_InitTypeDef and creates the associated handle.
  * @param huart            UART handle.
  * @param Polarity         Select the driver enable polarity.
  *          This parameter can be one of the following values:
  *          @arg @ref UART_DE_POLARITY_HIGH DE signal is active high
  *          @arg @ref UART_DE_POLARITY_LOW  DE signal is active low
  * @param AssertionTime    Driver Enable assertion time:
  *       5-bit value defining the time between the activation of the DE (Driver Enable)
  *       signal and the beginning of the start bit. It is expressed in sample time
  *       units (1/8 or 1/16 bit time, depending on the oversampling rate)
  * @param DeassertionTime  Driver Enable deassertion time:
  *       5-bit value defining the time between the end of the last stop bit, in a
  *       transmitted message, and the de-activation of the DE (Driver Enable) signal.
  *       It is expressed in sample time units (1/8 or 1/16 bit time, depending on the
  *       oversampling rate).
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RS485Ex_Init(UART_HandleTypeDef *huart, uint32_t Polarity, uint32_t AssertionTime,
                                   uint32_t DeassertionTime)
{
  uint32_t temp;

  /* Check the UART handle allocation */
  if (huart == NULL)
  {
    return HAL_ERROR;
  }
  /* Check the Driver Enable UART instance */
  assert_param(IS_UART_DRIVER_ENABLE_INSTANCE(huart->Instance));

  /* Check the Driver Enable polarity */
  assert_param(IS_UART_DE_POLARITY(Polarity));

  /* Check the Driver Enable assertion time */
  assert_param(IS_UART_ASSERTIONTIME(AssertionTime));

  /* Check the Driver Enable deassertion time */
  assert_param(IS_UART_DEASSERTIONTIME(DeassertionTime));

  if (huart->gState == HAL_UART_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    huart->Lock = HAL_UNLOCKED;

#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
    UART_InitCallbacksToDefault(huart);

    if (huart->MspInitCallback == NULL)
    {
      huart->MspInitCallback = HAL_UART_MspInit;
    }

    /* Init the low level hardware */
    huart->MspInitCallback(huart);
#else
    /* Init the low level hardware : GPIO, CLOCK, CORTEX */
    HAL_UART_MspInit(huart);
#endif /* (USE_HAL_UART_REGISTER_CALLBACKS) */
  }

  huart->gState = HAL_UART_STATE_BUSY;

  /* Disable the Peripheral */