/**
******************************************************************************
* @file stm32h7xx_ll_lpuart.c
* @author MCD Application Team
* @brief LPUART LL module driver.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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.
*
******************************************************************************
*/
#if defined(USE_FULL_LL_DRIVER)
/* Includes ------------------------------------------------------------------*/
#include "stm32h7xx_ll_lpuart.h"
#include "stm32h7xx_ll_rcc.h"
#include "stm32h7xx_ll_bus.h"
#ifdef USE_FULL_ASSERT
#include "stm32_assert.h"
#else
#define assert_param(expr) ((void)0U)
#endif /* USE_FULL_ASSERT */
/** @addtogroup STM32H7xx_LL_Driver
* @{
*/
#if defined (LPUART1)
/** @addtogroup LPUART_LL
* @{
*/
/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/** @addtogroup LPUART_LL_Private_Constants
* @{
*/
/* Definition of default baudrate value used for LPUART initialisation */
#define LPUART_DEFAULT_BAUDRATE (9600U)
/**
* @}
*/
/* Private macros ------------------------------------------------------------*/
/** @addtogroup LPUART_LL_Private_Macros
* @{
*/
/* Check of parameters for configuration of LPUART registers */
#define IS_LL_LPUART_PRESCALER(__VALUE__) (((__VALUE__) == LL_LPUART_PRESCALER_DIV1) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV2) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV4) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV6) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV8) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV10) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV12) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV16) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV32) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV64) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV128) \
|| ((__VALUE__) == LL_LPUART_PRESCALER_DIV256))
/* __BAUDRATE__ Depending on constraints applicable for LPUART BRR register */
/* value : */
/* - fck must be in the range [3 x baudrate, 4096 x baudrate] */
/* - LPUART_BRR register value should be >= 0x300 */
/* - LPUART_BRR register value should be <= 0xFFFFF (20 bits) */
/* Baudrate specified by the user should belong to [8, 33000000].*/
#define IS_LL_LPUART_BAUDRATE(__BAUDRATE__) (((__BAUDRATE__) <= 33000000U) && ((__BAUDRATE__) >= 8U))
/* __VALUE__ BRR content must be greater than or equal to 0x300. */
#define IS_LL_LPUART_BRR_MIN(__VALUE__) ((__VALUE__) >= 0x300U)
/* __VALUE__ BRR content must be lower than or equal to 0xFFFFF. */
#define IS_LL_LPUART_BRR_MAX(__VALUE__) ((__VALUE__) <= 0x000FFFFFU)
#define IS_LL_LPUART_DIRECTION(__VALUE__) (((__VALUE__) == LL_LPUART_DIRECTION_NONE) \
|| ((__VALUE__) == LL_LPUART_DIRECTION_RX) \
|| ((__VALUE__) == LL_LPUART_DIRECTION_TX) \
|| ((__VALUE__) == LL_LPUART_DIRECTION_TX_RX))
#define IS_LL_LPUART_PARITY(__VALUE__) (((__VALUE__) == LL_LPUART_PARITY_NONE) \
|| ((__VALUE__) == LL_LPUART_PARITY_EVEN) \
|| ((__VALUE__) == LL_LPUART_PARITY_ODD))
#define IS_LL_LPUART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_LPUART_DATAWIDTH_7B) \
|| ((__VALUE__) == LL_LPUART_DATAWIDTH_8B) \
|| ((__VALUE__) == LL_LPUART_DATAWIDTH_9B))
#define IS_LL_LPUART_STOPBITS(__VALUE__) (((__VALUE__) == LL_LPUART_STOPBITS_1) \
|| ((__VALUE__) == LL_LPUART_STOPBITS_2))
#define IS_LL_LPUART_HWCONTROL(__VALUE__) (((__VALUE__) == LL_LPUART_HWCONTROL_NONE) \
|| ((__VALUE__) == LL_LPUART_HWCONTROL_RTS) \
|| ((__VALUE__) == LL_LPUART_HWCONTROL_CTS) \
|| ((__VALUE__) == LL_LPUART_HWCONTROL_RTS_CTS))
/**
* @}
*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @addtogroup LPUART_LL_Exported_Functions
* @{
*/
/** @addtogroup LPUART_LL_EF_Init
* @{
*/
/**
* @brief De-initialize LPUART registers (Registers restored to their default values).
* @param LPUARTx LPUART Instance
* @retval An ErrorStatus enumeration value:
* - SUCCESS: LPUART registers are de-initialized
* - ERROR: not applicable
*/
ErrorStatus LL_LPUART_DeInit(const USART_TypeDef *LPUARTx)
{
ErrorStatus status = SUCCESS;
/* Check the parameters */
assert_param(IS_LPUART_INSTANCE(LPUARTx));
if (LPUARTx == LPUART1)
{
/* Force reset of LPUART peripheral */
LL_APB4_GRP1_ForceReset(LL_APB4_GRP1_PERIPH_LPUART1);
/* Release reset of LPUART peripheral */
LL_APB4_GRP1_ReleaseReset(LL_APB4_GRP1_PERIPH_LPUART1);
}
else
{
status = ERROR;
}
return (status);
}
/**
* @brief Initialize LPUART registers according to the specified
* parameters in LPUART_InitStruct.
* @note As some bits in LPUART configuration registers can only be written when
* the LPUART is disabled (USART_CR1_UE bit =0),
* LPUART Peripheral should be in disabled state prior calling this function.
* Otherwise, ERROR result will be returned.
* @note Baud rate value stored in LPUART_InitStruct BaudRate field, should be valid (different from 0).
* @param LPUARTx LPUART Instance
* @param LPUART_InitStruct pointer to a @ref LL_LPUART_InitTypeDef structure
* that contains the configuration information for the specified LPUART peripheral.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: LPUART registers are initialized according to LPUART_InitStruct content
* - ERROR: Problem occurred during LPUART Registers initialization
*/
ErrorStatus LL_LPUART_Init(USART_TypeDef *LPUARTx, const LL_LPUART_InitTypeDef *LPUART_InitStruct)
{
ErrorStatus status = ERROR;
uint32_t periphclk;
/* Check the parameters */
assert_param(IS_LPUART_INSTANCE(LPUARTx));
assert_param(IS_LL_LPUART_PRESCALER(LPUART_InitStruct->PrescalerValue));
assert_param(IS_LL_LPUART_BAUDRATE(LPUART_InitStruct->BaudRate));
assert_param(IS_LL_LPUART_DATAWIDTH(LPUART_InitStruct->DataWidth));
assert_param(IS_LL_LPUART_STOPBITS(LPUART_InitStruct->StopBits));
assert_param(IS_LL_LPUART_PARITY(LPUART_InitStruct->Parity));
assert_param(IS_LL_LPUART_DIRECTION(LPUART_InitStruct->TransferDirection));
assert_param(IS_LL_LPUART_HWCONTROL(LPUART_InitStruct->HardwareFlowControl));
/* LPUART needs to be in disabled state, in order to be able to configure some bits in
CRx registers. Otherwise (LPUART not in Disabled state) => return ERROR */
if (LL_LPUART_IsEnabled(LPUARTx) == 0U)
{
/*---------------------------- LPUART CR1 Configuration -----------------------
* Configure LPUARTx CR1 (LPUART Word Length, Parity and Transfer Direction bits) with parameters:
* - DataWidth: USART_CR1_M bits according to LPUART_InitStruct->DataWidth value
* - Parity: USART_CR1_PCE, USART_CR1_PS bits according to LPUART_InitStruct->Parity value
* - TransferDirection: USART_CR1_TE, USART_CR1_RE bits according to LPUART_InitStruct->TransferDirection value
*/
MODIFY_REG(LPUARTx->CR1,
(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | USART_CR1_TE | USART_CR1_RE),
(LPUART_InitStruct->DataWidth | LPUART_InitStruct->Parity | LPUART_InitStruct->TransferDirection));
/*---------------------------- LPUART CR2 Configuration -----------------------
* Configure LPUARTx CR2 (Stop bits) with parameters:
* - Stop Bits: USART_CR2_STOP bits according to LPUART_InitStruct->StopBits value.
*/
LL_LPUART_SetStopBitsLength(LPUARTx, LPUART_InitStruct->StopBits);
/*---------------------------- LPUART CR3 Configuration -----------------------
* Configure LPUARTx CR3 (Hardware Flow Control) with parameters:
* - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according
* to LPUART_InitStruct->HardwareFlowControl value.
*/
LL_LPUART_SetHWFlowCtrl(LPUARTx, LPUART_InitStruct->HardwareFlowControl);
/*---------------------------- LPUART BRR Configuration -----------------------
* Retrieve Clock frequency used for LPUART Peripheral
*/
periphclk = LL_RCC_GetLPUARTClockFreq(LL_RCC_LPUART1_CLKSOURCE);
/* Configure the LPUART Baud Rate :
- prescaler value is required
- valid baud rate value (different from 0) is required
- Peripheral clock as returned by RCC service, should be valid (different from 0).
*/
if ((periphclk != LL_RCC_PERIPH_FREQUENCY_NO)
&& (LPUART_InitStruct->BaudRate != 0U))
{
status = SUCCESS;
LL_LPUART_SetBaudRate(LPUARTx,
periphclk,
LPUART_InitStruct->PrescalerValue,
LPUART_InitStruct->BaudRate);
/* Check BRR is greater than or equal to 0x300 */
assert_param(IS_LL_LPUART_BRR_MIN(LPUARTx->BRR));
/* Check BRR is lower than or equal to 0xFFFFF */
assert_param(IS_LL_LPUART_BRR_MAX(LPUARTx->BRR));
}
/*---------------------------- LPUART PRESC Configuration -----------------------
* Configure LPUARTx PRESC (Prescaler) with parameters:
* - PrescalerValue: LPUART_PRESC_PRESCALER bits according to LPUART_InitStruct->PrescalerValue value.
*/
LL_LPUART_SetPrescaler(LPUARTx, LPUART_InitStruct->PrescalerValue);
}
return (status);
}
/**
* @brief Set each @ref LL_LPUART_InitTypeDef field to default value.
* @param LPUART_InitStruct pointer to a @ref LL_LPUART_InitTypeDef structure
* whose fields will be set to default values.
* @retval None
*/
void LL_LPUART_StructInit(LL_LPUART_InitTypeDef *LPUART_InitStruct)
{
/* Set LPUART_InitStruct fields to default values */
LPUART_InitStruct->PrescalerValue = LL_LPUART_PRESCALER_DIV1;
LPUART_InitStruct->BaudRate = LPUART_DEFAULT_BAUDRATE;
LPUART_InitStruct->DataWidth = LL_LPUART_DATAWIDTH_8B;
LPUART_InitStruct->StopBits = LL_LPUART_STOPBITS_1;
LPUART_InitStruct->Parity = LL_LPUART_PARITY_NONE ;
LPUART_InitStruct->TransferDirection = LL_LPUART_DIRECTION_TX_RX;
LPUART_InitStruct->HardwareFlowControl = LL_LPUART_HWCONTROL_NONE;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
#endif /* LPUART1 */
/**
* @}
*/
#endif /* USE_FULL_LL_DRIVER */
