298 lines
12 KiB
C
298 lines
12 KiB
C
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/**
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******************************************************************************
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* @file stm32l4xx_ll_lpuart.c
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* @author MCD Application Team
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* @brief LPUART LL module driver.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#if defined(USE_FULL_LL_DRIVER)
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l4xx_ll_lpuart.h"
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#include "stm32l4xx_ll_rcc.h"
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#include "stm32l4xx_ll_bus.h"
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#ifdef USE_FULL_ASSERT
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#include "stm32_assert.h"
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#else
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#define assert_param(expr) ((void)0U)
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#endif /* USE_FULL_ASSERT */
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/** @addtogroup STM32L4xx_LL_Driver
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* @{
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*/
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#if defined (LPUART1)
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/** @addtogroup LPUART_LL
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* @{
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*/
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/* Private types -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private constants ---------------------------------------------------------*/
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/** @addtogroup LPUART_LL_Private_Constants
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* @{
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*/
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/* Definition of default baudrate value used for LPUART initialisation */
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#define LPUART_DEFAULT_BAUDRATE (9600U)
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/**
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* @}
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*/
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/* Private macros ------------------------------------------------------------*/
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/** @addtogroup LPUART_LL_Private_Macros
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* @{
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*/
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/* Check of parameters for configuration of LPUART registers */
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#if defined(USART_PRESC_PRESCALER)
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#define IS_LL_LPUART_PRESCALER(__VALUE__) (((__VALUE__) == LL_LPUART_PRESCALER_DIV1) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV2) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV4) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV6) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV8) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV10) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV12) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV16) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV32) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV64) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV128) \
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|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV256))
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#endif /* USART_PRESC_PRESCALER */
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/* __BAUDRATE__ Depending on constraints applicable for LPUART BRR register */
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/* value : */
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/* - fck must be in the range [3 x baudrate, 4096 x baudrate] */
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/* - LPUART_BRR register value should be >= 0x300 */
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/* - LPUART_BRR register value should be <= 0xFFFFF (20 bits) */
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/* Baudrate specified by the user should belong to [8, 40000000].*/
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#define IS_LL_LPUART_BAUDRATE(__BAUDRATE__) (((__BAUDRATE__) <= 40000000U) && ((__BAUDRATE__) >= 8U))
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/* __VALUE__ BRR content must be greater than or equal to 0x300. */
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#define IS_LL_LPUART_BRR_MIN(__VALUE__) ((__VALUE__) >= 0x300U)
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/* __VALUE__ BRR content must be lower than or equal to 0xFFFFF. */
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#define IS_LL_LPUART_BRR_MAX(__VALUE__) ((__VALUE__) <= 0x000FFFFFU)
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#define IS_LL_LPUART_DIRECTION(__VALUE__) (((__VALUE__) == LL_LPUART_DIRECTION_NONE) \
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|| ((__VALUE__) == LL_LPUART_DIRECTION_RX) \
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|| ((__VALUE__) == LL_LPUART_DIRECTION_TX) \
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|| ((__VALUE__) == LL_LPUART_DIRECTION_TX_RX))
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#define IS_LL_LPUART_PARITY(__VALUE__) (((__VALUE__) == LL_LPUART_PARITY_NONE) \
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|| ((__VALUE__) == LL_LPUART_PARITY_EVEN) \
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|| ((__VALUE__) == LL_LPUART_PARITY_ODD))
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#define IS_LL_LPUART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_LPUART_DATAWIDTH_7B) \
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|| ((__VALUE__) == LL_LPUART_DATAWIDTH_8B) \
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|| ((__VALUE__) == LL_LPUART_DATAWIDTH_9B))
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#define IS_LL_LPUART_STOPBITS(__VALUE__) (((__VALUE__) == LL_LPUART_STOPBITS_1) \
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|| ((__VALUE__) == LL_LPUART_STOPBITS_2))
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#define IS_LL_LPUART_HWCONTROL(__VALUE__) (((__VALUE__) == LL_LPUART_HWCONTROL_NONE) \
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|| ((__VALUE__) == LL_LPUART_HWCONTROL_RTS) \
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|| ((__VALUE__) == LL_LPUART_HWCONTROL_CTS) \
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|| ((__VALUE__) == LL_LPUART_HWCONTROL_RTS_CTS))
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/**
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* @}
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*/
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/* Private function prototypes -----------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup LPUART_LL_Exported_Functions
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* @{
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*/
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/** @addtogroup LPUART_LL_EF_Init
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* @{
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*/
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/**
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* @brief De-initialize LPUART registers (Registers restored to their default values).
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* @param LPUARTx LPUART Instance
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* @retval An ErrorStatus enumeration value:
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* - SUCCESS: LPUART registers are de-initialized
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* - ERROR: not applicable
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*/
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ErrorStatus LL_LPUART_DeInit(const USART_TypeDef *LPUARTx)
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{
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ErrorStatus status = SUCCESS;
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/* Check the parameters */
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assert_param(IS_LPUART_INSTANCE(LPUARTx));
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if (LPUARTx == LPUART1)
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{
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/* Force reset of LPUART peripheral */
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LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_LPUART1);
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/* Release reset of LPUART peripheral */
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LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_LPUART1);
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}
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else
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{
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status = ERROR;
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}
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return (status);
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}
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/**
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* @brief Initialize LPUART registers according to the specified
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* parameters in LPUART_InitStruct.
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* @note As some bits in LPUART configuration registers can only be written when
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* the LPUART is disabled (USART_CR1_UE bit =0),
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* LPUART Peripheral should be in disabled state prior calling this function.
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* Otherwise, ERROR result will be returned.
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* @note Baud rate value stored in LPUART_InitStruct BaudRate field, should be valid (different from 0).
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* @param LPUARTx LPUART Instance
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* @param LPUART_InitStruct pointer to a @ref LL_LPUART_InitTypeDef structure
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* that contains the configuration information for the specified LPUART peripheral.
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* @retval An ErrorStatus enumeration value:
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* - SUCCESS: LPUART registers are initialized according to LPUART_InitStruct content
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* - ERROR: Problem occurred during LPUART Registers initialization
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*/
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ErrorStatus LL_LPUART_Init(USART_TypeDef *LPUARTx, const LL_LPUART_InitTypeDef *LPUART_InitStruct)
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{
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ErrorStatus status = ERROR;
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uint32_t periphclk;
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/* Check the parameters */
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assert_param(IS_LPUART_INSTANCE(LPUARTx));
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#if defined(USART_PRESC_PRESCALER)
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assert_param(IS_LL_LPUART_PRESCALER(LPUART_InitStruct->PrescalerValue));
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#endif /* USART_PRESC_PRESCALER */
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assert_param(IS_LL_LPUART_BAUDRATE(LPUART_InitStruct->BaudRate));
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assert_param(IS_LL_LPUART_DATAWIDTH(LPUART_InitStruct->DataWidth));
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assert_param(IS_LL_LPUART_STOPBITS(LPUART_InitStruct->StopBits));
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assert_param(IS_LL_LPUART_PARITY(LPUART_InitStruct->Parity));
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assert_param(IS_LL_LPUART_DIRECTION(LPUART_InitStruct->TransferDirection));
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assert_param(IS_LL_LPUART_HWCONTROL(LPUART_InitStruct->HardwareFlowControl));
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/* LPUART needs to be in disabled state, in order to be able to configure some bits in
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CRx registers. Otherwise (LPUART not in Disabled state) => return ERROR */
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if (LL_LPUART_IsEnabled(LPUARTx) == 0U)
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{
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/*---------------------------- LPUART CR1 Configuration -----------------------
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* Configure LPUARTx CR1 (LPUART Word Length, Parity and Transfer Direction bits) with parameters:
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* - DataWidth: USART_CR1_M bits according to LPUART_InitStruct->DataWidth value
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* - Parity: USART_CR1_PCE, USART_CR1_PS bits according to LPUART_InitStruct->Parity value
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* - TransferDirection: USART_CR1_TE, USART_CR1_RE bits according to LPUART_InitStruct->TransferDirection value
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*/
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MODIFY_REG(LPUARTx->CR1,
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(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | USART_CR1_TE | USART_CR1_RE),
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(LPUART_InitStruct->DataWidth | LPUART_InitStruct->Parity | LPUART_InitStruct->TransferDirection));
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/*---------------------------- LPUART CR2 Configuration -----------------------
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* Configure LPUARTx CR2 (Stop bits) with parameters:
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* - Stop Bits: USART_CR2_STOP bits according to LPUART_InitStruct->StopBits value.
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*/
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LL_LPUART_SetStopBitsLength(LPUARTx, LPUART_InitStruct->StopBits);
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/*---------------------------- LPUART CR3 Configuration -----------------------
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* Configure LPUARTx CR3 (Hardware Flow Control) with parameters:
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* - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according
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* to LPUART_InitStruct->HardwareFlowControl value.
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*/
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LL_LPUART_SetHWFlowCtrl(LPUARTx, LPUART_InitStruct->HardwareFlowControl);
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/*---------------------------- LPUART BRR Configuration -----------------------
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* Retrieve Clock frequency used for LPUART Peripheral
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*/
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periphclk = LL_RCC_GetLPUARTClockFreq(LL_RCC_LPUART1_CLKSOURCE);
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/* Configure the LPUART Baud Rate :
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#if defined(USART_PRESC_PRESCALER)
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- prescaler value is required
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#endif
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- valid baud rate value (different from 0) is required
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- Peripheral clock as returned by RCC service, should be valid (different from 0).
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*/
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if ((periphclk != LL_RCC_PERIPH_FREQUENCY_NO)
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&& (LPUART_InitStruct->BaudRate != 0U))
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{
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status = SUCCESS;
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LL_LPUART_SetBaudRate(LPUARTx,
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periphclk,
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#if defined(USART_PRESC_PRESCALER)
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LPUART_InitStruct->PrescalerValue,
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#endif /* USART_PRESC_PRESCALER */
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LPUART_InitStruct->BaudRate);
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/* Check BRR is greater than or equal to 0x300 */
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assert_param(IS_LL_LPUART_BRR_MIN(LPUARTx->BRR));
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/* Check BRR is lower than or equal to 0xFFFFF */
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assert_param(IS_LL_LPUART_BRR_MAX(LPUARTx->BRR));
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}
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#if defined(USART_PRESC_PRESCALER)
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/*---------------------------- LPUART PRESC Configuration -----------------------
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* Configure LPUARTx PRESC (Prescaler) with parameters:
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* - PrescalerValue: LPUART_PRESC_PRESCALER bits according to LPUART_InitStruct->PrescalerValue value.
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*/
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LL_LPUART_SetPrescaler(LPUARTx, LPUART_InitStruct->PrescalerValue);
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#endif /* USART_PRESC_PRESCALER */
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}
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return (status);
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}
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/**
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* @brief Set each @ref LL_LPUART_InitTypeDef field to default value.
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* @param LPUART_InitStruct pointer to a @ref LL_LPUART_InitTypeDef structure
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* whose fields will be set to default values.
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* @retval None
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*/
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void LL_LPUART_StructInit(LL_LPUART_InitTypeDef *LPUART_InitStruct)
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{
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/* Set LPUART_InitStruct fields to default values */
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#if defined(USART_PRESC_PRESCALER)
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LPUART_InitStruct->PrescalerValue = LL_LPUART_PRESCALER_DIV1;
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#endif /* USART_PRESC_PRESCALER */
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LPUART_InitStruct->BaudRate = LPUART_DEFAULT_BAUDRATE;
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LPUART_InitStruct->DataWidth = LL_LPUART_DATAWIDTH_8B;
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LPUART_InitStruct->StopBits = LL_LPUART_STOPBITS_1;
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LPUART_InitStruct->Parity = LL_LPUART_PARITY_NONE ;
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LPUART_InitStruct->TransferDirection = LL_LPUART_DIRECTION_TX_RX;
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LPUART_InitStruct->HardwareFlowControl = LL_LPUART_HWCONTROL_NONE;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* LPUART1 */
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/**
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* @}
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*/
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#endif /* USE_FULL_LL_DRIVER */
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