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stm32f0xx_hal_usart.c
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/**
******************************************************************************
* @file stm32f0xx_hal_usart.c
* @author MCD Application Team
* @brief USART HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of the Universal Synchronous Asynchronous Receiver Transmitter
* Peripheral (USART).
* + Initialization and de-initialization functions
* + IO operation functions
* + Peripheral Control functions
* + Peripheral State and Error functions
*
@verbatim
===============================================================================
##### 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, Hardware
flow control 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.
(#) Three operation modes are available within this driver :
*** Polling mode IO operation ***
=================================
[..]
(+) Send an amount of data in blocking mode using HAL_USART_Transmit()
(+) Receive an amount of data in blocking mode using HAL_USART_Receive()
*** Interrupt mode IO operation ***
===================================
[..]
(+) Send an amount of data in non blocking mode using HAL_USART_Transmit_IT()
(+) At transmission end of half transfer HAL_USART_TxHalfCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_TxHalfCpltCallback
(+) At transmission end of transfer HAL_USART_TxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_TxCpltCallback
(+) Receive an amount of data in non blocking mode using HAL_USART_Receive_IT()
(+) At reception end of half transfer HAL_USART_RxHalfCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxHalfCpltCallback
(+) At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxCpltCallback
(+) In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user can
add his own code by customization of function pointer HAL_USART_ErrorCallback
*** DMA mode IO operation ***
==============================
[..]
(+) Send an amount of data in non blocking mode (DMA) using HAL_USART_Transmit_DMA()
(+) At transmission end of half transfer HAL_USART_TxHalfCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_TxHalfCpltCallback
(+) At transmission end of transfer HAL_USART_TxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_TxCpltCallback
(+) Receive an amount of data in non blocking mode (DMA) using HAL_USART_Receive_DMA()
(+) At reception end of half transfer HAL_USART_RxHalfCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxHalfCpltCallback
(+) At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxCpltCallback
(+) In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user can
add his own code by customization of function pointer HAL_USART_ErrorCallback
(+) Pause the DMA Transfer using HAL_USART_DMAPause()
(+) Resume the DMA Transfer using HAL_USART_DMAResume()
(+) Stop the DMA Transfer using HAL_USART_DMAStop()
*** USART HAL driver macros list ***
=============================================
[..]
Below the list of most used macros in USART HAL driver.
(+) __HAL_USART_ENABLE: Enable the USART peripheral
(+) __HAL_USART_DISABLE: Disable the USART peripheral
(+) __HAL_USART_GET_FLAG : Check whether the specified USART flag is set or not
(+) __HAL_USART_CLEAR_FLAG : Clear the specified USART pending flag
(+) __HAL_USART_ENABLE_IT: Enable the specified USART interrupt
(+) __HAL_USART_DISABLE_IT: Disable the specified USART interrupt
[..]
(@) You can refer to the USART HAL driver header file for more useful macros
[..]
(@) 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.
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f0xx_hal.h"
/** @addtogroup STM32F0xx_HAL_Driver
* @{
*/
/** @defgroup USART USART
* @brief HAL USART Synchronous module driver
* @{
*/
#ifdef HAL_USART_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup USART_Private_Constants USART Private Constants
* @{
*/
#define USART_DUMMY_DATA ((uint16_t) 0xFFFFU) /*!< USART transmitted dummy data */
#define USART_TEACK_REACK_TIMEOUT ( 1000U) /*!< USART TX or RX enable acknowledge time-out value */
#define USART_CR1_FIELDS ((uint32_t)(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | \
USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8)) /*!< USART CR1 fields of parameters set by USART_SetConfig API */
#define USART_CR2_FIELDS ((uint32_t)(USART_CR2_CPHA | USART_CR2_CPOL | \
USART_CR2_CLKEN | USART_CR2_LBCL | USART_CR2_STOP)) /*!< USART CR2 fields of parameters set by USART_SetConfig API */
/**
* @}
*/
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @addtogroup USART_Private_Functions
* @{
*/
static void USART_EndTransfer(USART_HandleTypeDef *husart);
static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma);
static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma);
static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma);
static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma);
static void USART_DMAError(DMA_HandleTypeDef *hdma);
static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma);
static void USART_DMATxAbortCallback(DMA_HandleTypeDef *hdma);
static void USART_DMARxAbortCallback(DMA_HandleTypeDef *hdma);
static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status, uint32_t Tickstart, uint32_t Timeout);
static HAL_StatusTypeDef USART_SetConfig(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_CheckIdleState(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_Transmit_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_EndTransmit_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_Receive_IT(USART_HandleTypeDef *husart);
static HAL_StatusTypeDef USART_TransmitReceive_IT(USART_HandleTypeDef *husart);
/**
* @}
*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup USART_Exported_Functions USART Exported Functions
* @{
*/
/** @defgroup USART_Exported_Functions_Group1 Initialization and de-initialization functions
* @brief Initialization and Configuration functions
*
@verbatim
===============================================================================
##### Initialization and Configuration functions #####
===============================================================================
[..]
This subsection provides a set of functions allowing to initialize the USART
in asynchronous and in synchronous modes.
(+) For the asynchronous mode only these parameters can be configured:
(++) Baud Rate
(++) Word Length
(++) Stop Bit
(++) Parity
(++) USART polarity
(++) USART phase
(++) USART LastBit
(++) Receiver/transmitter modes
[..]
The HAL_USART_Init() function follows the USART synchronous configuration
procedure (details for the procedure are available in reference manual).
@endverbatim
* @{
*/
/*
Additional Table: 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.
According to device capability (support or not of 7-bit word length),
frame length is either defined by the M bit (8-bits or 9-bits)
or by the M1 and M0 bits (7-bit, 8-bit or 9-bit).
Possible USART frame formats are as listed in the following table:
Table 1. USART frame format.
+-----------------------------------------------------------------------+
| M bit | PCE bit | USART frame |
|-------------------|-----------|---------------------------------------|
| 0 | 0 | | SB | 8-bit data | STB | |
|-------------------|-----------|---------------------------------------|
| 0 | 1 | | SB | 7-bit data | PB | STB | |
|-------------------|-----------|---------------------------------------|
| 1 | 0 | | SB | 9-bit data | STB | |
|-------------------|-----------|---------------------------------------|
| 1 | 1 | | SB | 8-bit data | PB | STB | |
+-----------------------------------------------------------------------+
| M1 bit | M0 bit | PCE bit | USART 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 USART mode according to the specified
* parameters in the USART_InitTypeDef and initialize the associated handle.
* @param husart USART handle.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Init(USART_HandleTypeDef *husart)
{
/* Check the USART handle allocation */
if(husart == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_USART_INSTANCE(husart->Instance));
if(husart->State == HAL_USART_STATE_RESET)
{
/* Allocate lock resource and initialize it */
husart->Lock = HAL_UNLOCKED;
/* Init the low level hardware : GPIO, CLOCK */
HAL_USART_MspInit(husart);
}
husart->State = HAL_USART_STATE_BUSY;
/* Disable the Peripheral */
__HAL_USART_DISABLE(husart);
/* Set the Usart Communication parameters */
if (USART_SetConfig(husart) == HAL_ERROR)
{
return HAL_ERROR;
}
/* In Synchronous mode, the following bits must be kept cleared:
- LINEN bit (if LIN is supported) in the USART_CR2 register
- SCEN (if Smartcard is supported), HDSEL and IREN (if IrDA is supported) bits in the USART_CR3 register. */
#if defined (USART_CR2_LINEN)
husart->Instance->CR2 &= ~USART_CR2_LINEN;
#endif
#if defined (USART_CR3_SCEN)
#if defined (USART_CR3_IREN)
husart->Instance->CR3 &= ~(USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN);
#else
husart->Instance->CR3 &= ~(USART_CR3_SCEN | USART_CR3_HDSEL);
#endif
#else
#if defined (USART_CR3_IREN)
husart->Instance->CR3 &= ~(USART_CR3_HDSEL | USART_CR3_IREN);
#else
husart->Instance->CR3 &= ~(USART_CR3_HDSEL);
#endif
#endif
/* Enable the Peripheral */
__HAL_USART_ENABLE(husart);
/* TEACK and/or REACK to check before moving husart->State to Ready */
return (USART_CheckIdleState(husart));
}
/**
* @brief DeInitialize the USART peripheral.
* @param husart USART handle.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_DeInit(USART_HandleTypeDef *husart)
{
/* Check the USART handle allocation */
if(husart == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_USART_INSTANCE(husart->Instance));
husart->State = HAL_USART_STATE_BUSY;
husart->Instance->CR1 = 0x0U;
husart->Instance->CR2 = 0x0U;
husart->Instance->CR3 = 0x0U;
/* DeInit the low level hardware */
HAL_USART_MspDeInit(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_RESET;
/* Process Unlock */
__HAL_UNLOCK(husart);
return HAL_OK;
}
/**
* @brief Initialize the USART MSP.
* @param husart USART handle.
* @retval None
*/
__weak void HAL_USART_MspInit(USART_HandleTypeDef *husart)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(husart);
/* NOTE : This function should not be modified, when the callback is needed,
the HAL_USART_MspInit can be implemented in the user file
*/
}
/**
* @brief DeInitialize the USART MSP.
* @param husart USART handle.
* @retval None
*/
__weak void HAL_USART_MspDeInit(USART_HandleTypeDef *husart)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(husart);
/* NOTE : This function should not be modified, when the callback is needed,
the HAL_USART_MspDeInit can be implemented in the user file
*/
}
/**
* @}
*/
/** @defgroup USART_Exported_Functions_Group2 IO operation functions
* @brief USART Transmit and Receive functions
*
@verbatim
===============================================================================
##### IO operation functions #####
===============================================================================
[..] This subsection provides a set of functions allowing to manage the USART synchronous
data transfers.
[..] The USART supports master mode only: it cannot receive or send data related to an input
clock (SCLK is always an output).
(#) There are two modes of transfer:
(++) Blocking mode: The communication is performed in polling mode.
The HAL status of all data processing is returned by the same function
after finishing transfer.
(++) No-Blocking mode: The communication is performed using Interrupts
or DMA, These APIs return the HAL status.
The end of the data processing will be indicated through the
dedicated USART IRQ when using Interrupt mode or the DMA IRQ when
using DMA mode.
The HAL_USART_TxCpltCallback(), HAL_USART_RxCpltCallback() and HAL_USART_TxRxCpltCallback() user callbacks
will be executed respectively at the end of the transmit or Receive process
The HAL_USART_ErrorCallback()user callback will be executed when a communication error is detected
(#) Blocking mode APIs are :
(++) HAL_USART_Transmit()in simplex mode
(++) HAL_USART_Receive() in full duplex receive only
(++) HAL_USART_TransmitReceive() in full duplex mode
(#) No-Blocking mode APIs with Interrupt are :
(++) HAL_USART_Transmit_IT()in simplex mode
(++) HAL_USART_Receive_IT() in full duplex receive only
(++) HAL_USART_TransmitReceive_IT()in full duplex mode
(++) HAL_USART_IRQHandler()
(#) No-Blocking mode APIs with DMA are :
(++) HAL_USART_Transmit_DMA()in simplex mode
(++) HAL_USART_Receive_DMA() in full duplex receive only
(++) HAL_USART_TransmitReceive_DMA() in full duplex mode
(++) HAL_USART_DMAPause()
(++) HAL_USART_DMAResume()
(++) HAL_USART_DMAStop()
(#) A set of Transfer Complete Callbacks are provided in Non-Blocking mode:
(++) HAL_USART_TxCpltCallback()
(++) HAL_USART_RxCpltCallback()
(++) HAL_USART_TxHalfCpltCallback()
(++) HAL_USART_RxHalfCpltCallback()
(++) HAL_USART_ErrorCallback()
(++) HAL_USART_TxRxCpltCallback()
(#) Non-Blocking mode transfers could be aborted using Abort API's :
(++) HAL_USART_Abort()
(++) HAL_USART_Abort_IT()
(#) For Abort services based on interrupts (HAL_USART_Abort_IT), a Abort Complete Callbacks is provided:
(++) HAL_USART_AbortCpltCallback()
(#) In Non-Blocking mode transfers, possible errors are split into 2 categories.
Errors are handled as follows :
(++) Error is considered as Recoverable and non blocking : Transfer could go till end, but error severity is
to be evaluated by user : this concerns Frame Error, Parity Error or Noise Error in Interrupt mode reception .
Received character is then retrieved and stored in Rx buffer, Error code is set to allow user to identify error type,
and HAL_USART_ErrorCallback() user callback is executed. Transfer is kept ongoing on USART side.
If user wants to abort it, Abort services should be called by user.
(++) Error is considered as Blocking : Transfer could not be completed properly and is aborted.
This concerns Overrun Error In Interrupt mode reception and all errors in DMA mode.
Error code is set to allow user to identify error type, and HAL_USART_ErrorCallback() user callback is executed.
@endverbatim
* @{
*/
/**
* @brief Simplex send an amount of data in blocking mode.
* @param husart USART handle.
* @param pTxData Pointer to data buffer.
* @param Size Amount of data to be sent.
* @param Timeout Timeout duration.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffer containing data to be sent, should be aligned on a half word frontier (16 bits)
* (as sent data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pTxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Transmit(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size, uint32_t Timeout)
{
uint16_t* tmp=0U;
uint32_t tickstart = 0U;
if(husart->State == HAL_USART_STATE_READY)
{
if((pTxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pTxData buffer provided as input paramter
should be aligned on a u16 frontier, as data to be filled into TDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if((((uint32_t)pTxData)&1U) != 0U)
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_TX;
/* Init tickstart for timeout managment*/
tickstart = HAL_GetTick();
husart->TxXferSize = Size;
husart->TxXferCount = Size;
/* Check the remaining data to be sent */
while(husart->TxXferCount > 0)
{
husart->TxXferCount--;
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
tmp = (uint16_t*) pTxData;
husart->Instance->TDR = (*tmp & (uint16_t)0x01FFU);
pTxData += 2U;
}
else
{
husart->Instance->TDR = (*pTxData++ & (uint8_t)0xFFU);
}
}
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* At end of Tx process, restore husart->State to Ready */
husart->State = HAL_USART_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(husart);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Receive an amount of data in blocking mode.
* @note To receive synchronous data, dummy data are simultaneously transmitted.
* @param husart USART handle.
* @param pRxData Pointer to data buffer.
* @param Size Amount of data to be received.
* @param Timeout Timeout duration.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffer for storing data to be received, should be aligned on a half word frontier (16 bits)
* (as received data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pRxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Receive(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
uint16_t* tmp=0U;
uint16_t uhMask;
uint32_t tickstart = 0U;
if(husart->State == HAL_USART_STATE_READY)
{
if((pRxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pRxData buffer provided as input paramter
should be aligned on a u16 frontier, as data to be received from RDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if((((uint32_t)pRxData)&1U) != 0U)
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_RX;
/* Init tickstart for timeout managment*/
tickstart = HAL_GetTick();
husart->RxXferSize = Size;
husart->RxXferCount = Size;
/* Computation of USART mask to apply to RDR register */
USART_MASK_COMPUTATION(husart);
uhMask = husart->Mask;
/* as long as data have to be received */
while(husart->RxXferCount > 0U)
{
husart->RxXferCount--;
/* Wait until TC flag is set to send dummy byte in order to generate the
* clock for the slave to send data.
* Whatever the frame length (7, 8 or 9-bit long), the same dummy value
* can be written for all the cases. */
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
husart->Instance->TDR = (USART_DUMMY_DATA & (uint16_t)0x0FFU);
/* Wait for RXNE Flag */
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
tmp = (uint16_t*) pRxData ;
*tmp = (uint16_t)(husart->Instance->RDR & uhMask);
pRxData +=2;
}
else
{
*pRxData++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
}
}
/* At end of Rx process, restore husart->State to Ready */
husart->State = HAL_USART_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(husart);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Full-Duplex Send and Receive an amount of data in blocking mode.
* @param husart USART handle.
* @param pTxData pointer to TX data buffer.
* @param pRxData pointer to RX data buffer.
* @param Size amount of data to be sent (same amount to be received).
* @param Timeout Timeout duration.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffers containing data to be sent/received, should be aligned on a half word frontier (16 bits)
* (as sent/received data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pTxData and pRxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_TransmitReceive(USART_HandleTypeDef *husart, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
uint16_t* tmp=0U;
uint16_t uhMask;
uint32_t tickstart = 0U;
if(husart->State == HAL_USART_STATE_READY)
{
if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pTxData and pRxData buffers provided as input paramter
should be aligned on a u16 frontier, as data to be filled into TDR/retrieved from RDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if(((((uint32_t)pTxData)&1U) != 0U) || ((((uint32_t)pRxData)&1U) != 0U))
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_RX;
/* Init tickstart for timeout managment*/
tickstart = HAL_GetTick();
husart->RxXferSize = Size;
husart->TxXferSize = Size;
husart->TxXferCount = Size;
husart->RxXferCount = Size;
/* Computation of USART mask to apply to RDR register */
USART_MASK_COMPUTATION(husart);
uhMask = husart->Mask;
/* Check the remain data to be sent */
while(husart->TxXferCount > 0U)
{
husart->TxXferCount--;
husart->RxXferCount--;
/* Wait until TC flag is set to send data */
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
tmp = (uint16_t*) pTxData;
husart->Instance->TDR = (*tmp & uhMask);
pTxData += 2U;
}
else
{
husart->Instance->TDR = (*pTxData++ & (uint8_t)uhMask);
}
/* Wait for RXNE Flag */
if(USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
if((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
tmp = (uint16_t*) pRxData ;
*tmp = (uint16_t)(husart->Instance->RDR & uhMask);
pRxData +=2U;
}
else
{
*pRxData++ = (uint8_t)(husart->Instance->RDR & (uint8_t)uhMask);
}
}
/* At end of TxRx process, restore husart->State to Ready */
husart->State = HAL_USART_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(husart);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Send an amount of data in interrupt mode.
* @param husart USART handle.
* @param pTxData pointer to data buffer.
* @param Size amount of data to be sent.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffer containing data to be sent, should be aligned on a half word frontier (16 bits)
* (as sent data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pTxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Transmit_IT(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size)
{
if(husart->State == HAL_USART_STATE_READY)
{
if((pTxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pTxData buffer provided as input paramter
should be aligned on a u16 frontier, as data to be filled into TDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if((((uint32_t)pTxData)&1U) != 0U)
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->pTxBuffPtr = pTxData;
husart->TxXferSize = Size;
husart->TxXferCount = Size;
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_TX;
/* The USART Error Interrupts: (Frame error, noise error, overrun error)
are not managed by the USART Transmit Process to avoid the overrun interrupt
when the usart mode is configured for transmit and receive "USART_MODE_TX_RX"
to benefit for the frame error and noise interrupts the usart mode should be
configured only for transmit "USART_MODE_TX" */
/* Process Unlocked */
__HAL_UNLOCK(husart);
/* Enable the USART Transmit Data Register Empty Interrupt */
__HAL_USART_ENABLE_IT(husart, USART_IT_TXE);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Receive an amount of data in interrupt mode.
* @note To receive synchronous data, dummy data are simultaneously transmitted.
* @param husart USART handle.
* @param pRxData pointer to data buffer.
* @param Size amount of data to be received.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffer for storing data to be received, should be aligned on a half word frontier (16 bits)
* (as received data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pRxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Receive_IT(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size)
{
if(husart->State == HAL_USART_STATE_READY)
{
if((pRxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pRxData buffer provided as input paramter
should be aligned on a u16 frontier, as data to be received from RDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if((((uint32_t)pRxData)&1U) != 0U)
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->pRxBuffPtr = pRxData;
husart->RxXferSize = Size;
husart->RxXferCount = Size;
USART_MASK_COMPUTATION(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_RX;
/* Process Unlocked */
__HAL_UNLOCK(husart);
/* Enable the USART Parity Error and Data Register not empty Interrupts */
SET_BIT(husart->Instance->CR1, USART_CR1_PEIE | USART_CR1_RXNEIE);
/* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
/* Send dummy byte in order to generate the clock for the Slave to send the next data */
if(husart->Init.WordLength == USART_WORDLENGTH_9B)
{
husart->Instance->TDR = (USART_DUMMY_DATA & (uint16_t)0x01FFU);
}
else
{
husart->Instance->TDR = (USART_DUMMY_DATA & (uint16_t)0x00FFU);
}
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Full-Duplex Send and Receive an amount of data in interrupt mode.
* @param husart USART handle.
* @param pTxData pointer to TX data buffer.
* @param pRxData pointer to RX data buffer.
* @param Size amount of data to be sent (same amount to be received).
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffers containing data to be sent/received, should be aligned on a half word frontier (16 bits)
* (as sent/received data will be handled using u16 pointer cast). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pTxData and pRxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_TransmitReceive_IT(USART_HandleTypeDef *husart, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size)
{
if(husart->State == HAL_USART_STATE_READY)
{
if((pTxData == NULL) || (pRxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pTxData and pRxData buffers provided as input paramter
should be aligned on a u16 frontier, as data to be filled into TDR/retrieved from RDR will be
handled through a u16 cast. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if(((((uint32_t)pTxData)&1U) != 0U) || ((((uint32_t)pRxData)&1U) != 0U))
{
return HAL_ERROR;
}
}
/* Process Locked */
__HAL_LOCK(husart);
husart->pRxBuffPtr = pRxData;
husart->RxXferSize = Size;
husart->RxXferCount = Size;
husart->pTxBuffPtr = pTxData;
husart->TxXferSize = Size;
husart->TxXferCount = Size;
/* Computation of USART mask to apply to RDR register */
USART_MASK_COMPUTATION(husart);
husart->ErrorCode = HAL_USART_ERROR_NONE;
husart->State = HAL_USART_STATE_BUSY_TX_RX;
/* Process Unlocked */
__HAL_UNLOCK(husart);
/* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
/* Enable the USART Parity Error and USART Data Register not empty Interrupts */
SET_BIT(husart->Instance->CR1, USART_CR1_PEIE | USART_CR1_RXNEIE);
/* Enable the USART Transmit Data Register Empty Interrupt */
SET_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Send an amount of data in DMA mode.
* @param husart USART handle.
* @param pTxData pointer to data buffer.
* @param Size amount of data to be sent.
* @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
* address of user data buffer containing data to be sent, should be aligned on a half word frontier (16 bits)
* (as sent data will be handled by DMA from halfword frontier). Depending on compilation chain,
* use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pTxData.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_USART_Transmit_DMA(USART_HandleTypeDef *husart, uint8_t *pTxData, uint16_t Size)
{
uint32_t *tmp=0U;
if(husart->State == HAL_USART_STATE_READY)
{
if((pTxData == NULL) || (Size == 0U))
{
return HAL_ERROR;
}
/* In case of 9bits/No Parity transfer, pTxData buffer provided as input paramter
should be aligned on a u16 frontier, as data copy into TDR will be
handled by DMA from a u16 frontier. */
if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
{
if((((uint32_t)pTxData)&1U) != 0U)