/** | |
****************************************************************************** | |
* @file stm32l0xx_ll_lpuart.c | |
* @author MCD Application Team | |
* @brief LPUART LL module driver. | |
****************************************************************************** | |
* @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. | |
* | |
****************************************************************************** | |
*/ | |
#if defined(USE_FULL_LL_DRIVER) | |
/* Includes ------------------------------------------------------------------*/ | |
#include "stm32l0xx_ll_lpuart.h" | |
#include "stm32l0xx_ll_rcc.h" | |
#include "stm32l0xx_ll_bus.h" | |
#ifdef USE_FULL_ASSERT | |
#include "stm32_assert.h" | |
#else | |
#define assert_param(expr) ((void)0U) | |
#endif | |
/** @addtogroup STM32L0xx_LL_Driver | |
* @{ | |
*/ | |
#if defined (LPUART1) | |
/** @addtogroup LPUART_LL | |
* @{ | |
*/ | |
/* Private types -------------------------------------------------------------*/ | |
/* Private variables ---------------------------------------------------------*/ | |
/* Private constants ---------------------------------------------------------*/ | |
/** @addtogroup LPUART_LL_Private_Constants | |
* @{ | |
*/ | |
/** | |
* @} | |
*/ | |
/* Private macros ------------------------------------------------------------*/ | |
/** @addtogroup LPUART_LL_Private_Macros | |
* @{ | |
*/ | |
/* Check of parameters for configuration of LPUART registers */ | |
/* __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, 10600000].*/ | |
#define IS_LL_LPUART_BAUDRATE(__BAUDRATE__) (((__BAUDRATE__) <= 10600000U) && ((__BAUDRATE__) >= 8U)) | |
#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(USART_TypeDef *LPUARTx) | |
{ | |
ErrorStatus status = SUCCESS; | |
/* Check the parameters */ | |
assert_param(IS_LPUART_INSTANCE(LPUARTx)); | |
/* Force reset of LPUART peripheral */ | |
LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_LPUART1); | |
/* Release reset of LPUART peripheral */ | |
LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_LPUART1); | |
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 IP 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, LL_LPUART_InitTypeDef *LPUART_InitStruct) | |
{ | |
ErrorStatus status = ERROR; | |
uint32_t periphclk = LL_RCC_PERIPH_FREQUENCY_NO; | |
/* Check the parameters */ | |
assert_param(IS_LPUART_INSTANCE(LPUARTx)); | |
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 : | |
- 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->BaudRate); | |
} | |
} | |
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->BaudRate = 9600U; | |
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 /* defined (LPUART1) */ | |
/** | |
* @} | |
*/ | |
#endif /* USE_FULL_LL_DRIVER */ | |
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ | |