mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_usart.c
- Revision:
- 156:95d6b41a828b
- Child:
- 180:96ed750bd169
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_usart.c Mon Jan 16 15:03:32 2017 +0000 @@ -0,0 +1,519 @@ +/** + ****************************************************************************** + * @file stm32f0xx_ll_usart.c + * @author MCD Application Team + * @version V1.4.0 + * @date 27-May-2016 + * @brief USART 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 "stm32f0xx_ll_usart.h" +#include "stm32f0xx_ll_rcc.h" +#include "stm32f0xx_ll_bus.h" +#ifdef USE_FULL_ASSERT +#include "stm32_assert.h" +#else +#define assert_param(expr) ((void)0U) +#endif + +/** @addtogroup STM32F0xx_LL_Driver + * @{ + */ + +#if defined (USART1) || defined (USART2) || defined (USART3) || defined (USART4) || defined (USART5) || defined (USART6) || defined (USART7) || defined (USART8) + +/** @addtogroup USART_LL + * @{ + */ + +/* Private types -------------------------------------------------------------*/ +/* Private variables ---------------------------------------------------------*/ +/* Private constants ---------------------------------------------------------*/ +/** @addtogroup USART_LL_Private_Constants + * @{ + */ + +/** + * @} + */ + + +/* Private macros ------------------------------------------------------------*/ +/** @addtogroup USART_LL_Private_Macros + * @{ + */ + +/* __BAUDRATE__ The maximum Baud Rate is derived from the maximum clock available + * divided by the smallest oversampling used on the USART (i.e. 8) */ +#define IS_LL_USART_BAUDRATE(__BAUDRATE__) ((__BAUDRATE__) <= 6000000U) + +#define IS_LL_USART_DIRECTION(__VALUE__) (((__VALUE__) == LL_USART_DIRECTION_NONE) \ + || ((__VALUE__) == LL_USART_DIRECTION_RX) \ + || ((__VALUE__) == LL_USART_DIRECTION_TX) \ + || ((__VALUE__) == LL_USART_DIRECTION_TX_RX)) + +#define IS_LL_USART_PARITY(__VALUE__) (((__VALUE__) == LL_USART_PARITY_NONE) \ + || ((__VALUE__) == LL_USART_PARITY_EVEN) \ + || ((__VALUE__) == LL_USART_PARITY_ODD)) + +#if defined(USART_7BITS_SUPPORT) +#define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_7B) \ + || ((__VALUE__) == LL_USART_DATAWIDTH_8B) \ + || ((__VALUE__) == LL_USART_DATAWIDTH_9B)) +#else +#define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_8B) \ + || ((__VALUE__) == LL_USART_DATAWIDTH_9B)) +#endif + +#define IS_LL_USART_OVERSAMPLING(__VALUE__) (((__VALUE__) == LL_USART_OVERSAMPLING_16) \ + || ((__VALUE__) == LL_USART_OVERSAMPLING_8)) + +#define IS_LL_USART_LASTBITCLKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_LASTCLKPULSE_NO_OUTPUT) \ + || ((__VALUE__) == LL_USART_LASTCLKPULSE_OUTPUT)) + +#define IS_LL_USART_CLOCKPHASE(__VALUE__) (((__VALUE__) == LL_USART_PHASE_1EDGE) \ + || ((__VALUE__) == LL_USART_PHASE_2EDGE)) + +#define IS_LL_USART_CLOCKPOLARITY(__VALUE__) (((__VALUE__) == LL_USART_POLARITY_LOW) \ + || ((__VALUE__) == LL_USART_POLARITY_HIGH)) + +#define IS_LL_USART_CLOCKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_CLOCK_DISABLE) \ + || ((__VALUE__) == LL_USART_CLOCK_ENABLE)) + +#if defined(USART_SMARTCARD_SUPPORT) +#define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_0_5) \ + || ((__VALUE__) == LL_USART_STOPBITS_1) \ + || ((__VALUE__) == LL_USART_STOPBITS_1_5) \ + || ((__VALUE__) == LL_USART_STOPBITS_2)) +#else +#define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_1) \ + || ((__VALUE__) == LL_USART_STOPBITS_2)) +#endif + +#define IS_LL_USART_HWCONTROL(__VALUE__) (((__VALUE__) == LL_USART_HWCONTROL_NONE) \ + || ((__VALUE__) == LL_USART_HWCONTROL_RTS) \ + || ((__VALUE__) == LL_USART_HWCONTROL_CTS) \ + || ((__VALUE__) == LL_USART_HWCONTROL_RTS_CTS)) + +/** + * @} + */ + +/* Private function prototypes -----------------------------------------------*/ + +/* Exported functions --------------------------------------------------------*/ +/** @addtogroup USART_LL_Exported_Functions + * @{ + */ + +/** @addtogroup USART_LL_EF_Init + * @{ + */ + +/** + * @brief De-initialize USART registers (Registers restored to their default values). + * @param USARTx USART Instance + * @retval An ErrorStatus enumeration value: + * - SUCCESS: USART registers are de-initialized + * - ERROR: USART registers are not de-initialized + */ +ErrorStatus LL_USART_DeInit(USART_TypeDef *USARTx) +{ + ErrorStatus status = SUCCESS; + + /* Check the parameters */ + assert_param(IS_UART_INSTANCE(USARTx)); + + if (USARTx == USART1) + { + /* Force reset of USART clock */ + LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART1); + + /* Release reset of USART clock */ + LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART1); + } +#if defined(USART2) + else if (USARTx == USART2) + { + /* Force reset of USART clock */ + LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART2); + + /* Release reset of USART clock */ + LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART2); + } +#endif /* USART2 */ +#if defined(USART3) + else if (USARTx == USART3) + { + /* Force reset of USART clock */ + LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART3); + + /* Release reset of USART clock */ + LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART3); + } +#endif /* USART3 */ +#if defined(USART4) + else if (USARTx == USART4) + { + /* Force reset of USART clock */ + LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART4); + + /* Release reset of USART clock */ + LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART4); + } +#endif /* USART4 */ +#if defined(USART5) + else if (USARTx == USART5) + { + /* Force reset of USART clock */ + LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART5); + + /* Release reset of USART clock */ + LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART5); + } +#endif /* USART5 */ +#if defined(USART6) + else if (USARTx == USART6) + { + /* Force reset of USART clock */ + LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART6); + + /* Release reset of USART clock */ + LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART6); + } +#endif /* USART6 */ +#if defined(USART7) + else if (USARTx == USART7) + { + /* Force reset of USART clock */ + LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART7); + + /* Release reset of USART clock */ + LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART7); + } +#endif /* USART7 */ +#if defined(USART8) + else if (USARTx == USART8) + { + /* Force reset of USART clock */ + LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART8); + + /* Release reset of USART clock */ + LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART8); + } +#endif /* USART8 */ + else + { + status = ERROR; + } + + return (status); +} + +/** + * @brief Initialize USART registers according to the specified + * parameters in USART_InitStruct. + * @note As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0), + * USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned. + * @note Baud rate value stored in USART_InitStruct BaudRate field, should be valid (different from 0). + * @param USARTx USART Instance + * @param USART_InitStruct: pointer to a LL_USART_InitTypeDef structure + * that contains the configuration information for the specified USART peripheral. + * @retval An ErrorStatus enumeration value: + * - SUCCESS: USART registers are initialized according to USART_InitStruct content + * - ERROR: Problem occurred during USART Registers initialization + */ +ErrorStatus LL_USART_Init(USART_TypeDef *USARTx, LL_USART_InitTypeDef *USART_InitStruct) +{ + ErrorStatus status = ERROR; + uint32_t periphclk = LL_RCC_PERIPH_FREQUENCY_NO; +#if defined(STM32F030x8) || defined(STM32F030xC) || defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F051x8) || defined(STM32F058xx) || defined(STM32F070x6) || defined(STM32F070xB) || defined(STM32F071xB) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx) + LL_RCC_ClocksTypeDef RCC_Clocks; +#endif + + /* Check the parameters */ + assert_param(IS_UART_INSTANCE(USARTx)); + assert_param(IS_LL_USART_BAUDRATE(USART_InitStruct->BaudRate)); + assert_param(IS_LL_USART_DATAWIDTH(USART_InitStruct->DataWidth)); + assert_param(IS_LL_USART_STOPBITS(USART_InitStruct->StopBits)); + assert_param(IS_LL_USART_PARITY(USART_InitStruct->Parity)); + assert_param(IS_LL_USART_DIRECTION(USART_InitStruct->TransferDirection)); + assert_param(IS_LL_USART_HWCONTROL(USART_InitStruct->HardwareFlowControl)); + assert_param(IS_LL_USART_OVERSAMPLING(USART_InitStruct->OverSampling)); + + /* USART needs to be in disabled state, in order to be able to configure some bits in + CRx registers */ + if (LL_USART_IsEnabled(USARTx) == 0U) + { + /*---------------------------- USART CR1 Configuration ----------------------- + * Configure USARTx CR1 (USART Word Length, Parity, Mode and Oversampling bits) with parameters: + * - DataWidth: USART_CR1_M bits according to USART_InitStruct->DataWidth value + * - Parity: USART_CR1_PCE, USART_CR1_PS bits according to USART_InitStruct->Parity value + * - TransferDirection: USART_CR1_TE, USART_CR1_RE bits according to USART_InitStruct->TransferDirection value + * - Oversampling: USART_CR1_OVER8 bit according to USART_InitStruct->OverSampling value. + */ + MODIFY_REG(USARTx->CR1, + (USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | + USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8), + (USART_InitStruct->DataWidth | USART_InitStruct->Parity | + USART_InitStruct->TransferDirection | USART_InitStruct->OverSampling)); + + /*---------------------------- USART CR2 Configuration ----------------------- + * Configure USARTx CR2 (Stop bits) with parameters: + * - Stop Bits: USART_CR2_STOP bits according to USART_InitStruct->StopBits value. + * - CLKEN, CPOL, CPHA and LBCL bits are to be configured using LL_USART_ClockInit(). + */ + LL_USART_SetStopBitsLength(USARTx, USART_InitStruct->StopBits); + + /*---------------------------- USART CR3 Configuration ----------------------- + * Configure USARTx CR3 (Hardware Flow Control) with parameters: + * - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according to USART_InitStruct->HardwareFlowControl value. + */ + LL_USART_SetHWFlowCtrl(USARTx, USART_InitStruct->HardwareFlowControl); + + /*---------------------------- USART BRR Configuration ----------------------- + * Retrieve Clock frequency used for USART Peripheral + */ + if (USARTx == USART1) + { + periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE); + } +#if defined(USART2) + else if (USARTx == USART2) + { +#if defined (RCC_CFGR3_USART2SW) + periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART2_CLKSOURCE); +#else + /* USART2 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; +#endif + } +#endif /* USART2 */ +#if defined(USART3) + else if (USARTx == USART3) + { +#if defined (RCC_CFGR3_USART3SW) + periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART3_CLKSOURCE); +#else + /* USART3 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; +#endif + } +#endif /* USART3 */ +#if defined(USART4) + else if (USARTx == USART4) + { + /* USART4 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; + } +#endif /* USART4 */ +#if defined(USART5) + else if (USARTx == USART5) + { + /* USART5 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; + } +#endif /* USART5 */ +#if defined(USART6) + else if (USARTx == USART6) + { + /* USART6 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; + } +#endif /* USART6 */ +#if defined(USART7) + else if (USARTx == USART7) + { + /* USART7 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; + } +#endif /* USART7 */ +#if defined(USART8) + else if (USARTx == USART8) + { + /* USART8 clock is PCLK */ + LL_RCC_GetSystemClocksFreq(&RCC_Clocks); + periphclk = RCC_Clocks.PCLK1_Frequency; + } +#endif /* USART8 */ + else + { + /* Nothing to do, as error code is already assigned to ERROR value */ + } + + /* Configure the USART 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) + && (USART_InitStruct->BaudRate != 0U)) + { + status = SUCCESS; + LL_USART_SetBaudRate(USARTx, + periphclk, + USART_InitStruct->OverSampling, + USART_InitStruct->BaudRate); + } + } + /* Endif (=> USART not in Disabled state => return ERROR) */ + + return (status); +} + +/** + * @brief Set each @ref LL_USART_InitTypeDef field to default value. + * @param USART_InitStruct: pointer to a @ref LL_USART_InitTypeDef structure + * whose fields will be set to default values. + * @retval None + */ + +void LL_USART_StructInit(LL_USART_InitTypeDef *USART_InitStruct) +{ + /* Set USART_InitStruct fields to default values */ + USART_InitStruct->BaudRate = 9600U; + USART_InitStruct->DataWidth = LL_USART_DATAWIDTH_8B; + USART_InitStruct->StopBits = LL_USART_STOPBITS_1; + USART_InitStruct->Parity = LL_USART_PARITY_NONE ; + USART_InitStruct->TransferDirection = LL_USART_DIRECTION_TX_RX; + USART_InitStruct->HardwareFlowControl = LL_USART_HWCONTROL_NONE; + USART_InitStruct->OverSampling = LL_USART_OVERSAMPLING_16; +} + +/** + * @brief Initialize USART Clock related settings according to the + * specified parameters in the USART_ClockInitStruct. + * @note As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0), + * USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned. + * @param USARTx USART Instance + * @param USART_ClockInitStruct: pointer to a @ref LL_USART_ClockInitTypeDef structure + * that contains the Clock configuration information for the specified USART peripheral. + * @retval An ErrorStatus enumeration value: + * - SUCCESS: USART registers related to Clock settings are initialized according to USART_ClockInitStruct content + * - ERROR: Problem occurred during USART Registers initialization + */ +ErrorStatus LL_USART_ClockInit(USART_TypeDef *USARTx, LL_USART_ClockInitTypeDef *USART_ClockInitStruct) +{ + ErrorStatus status = SUCCESS; + + /* Check USART Instance and Clock signal output parameters */ + assert_param(IS_UART_INSTANCE(USARTx)); + assert_param(IS_LL_USART_CLOCKOUTPUT(USART_ClockInitStruct->ClockOutput)); + + /* USART needs to be in disabled state, in order to be able to configure some bits in + CRx registers */ + if (LL_USART_IsEnabled(USARTx) == 0U) + { + /*---------------------------- USART CR2 Configuration -----------------------*/ + /* If Clock signal has to be output */ + if (USART_ClockInitStruct->ClockOutput == LL_USART_CLOCK_DISABLE) + { + /* Deactivate Clock signal delivery : + * - Disable Clock Output: USART_CR2_CLKEN cleared + */ + LL_USART_DisableSCLKOutput(USARTx); + } + else + { + /* Ensure USART instance is USART capable */ + assert_param(IS_USART_INSTANCE(USARTx)); + + /* Check clock related parameters */ + assert_param(IS_LL_USART_CLOCKPOLARITY(USART_ClockInitStruct->ClockPolarity)); + assert_param(IS_LL_USART_CLOCKPHASE(USART_ClockInitStruct->ClockPhase)); + assert_param(IS_LL_USART_LASTBITCLKOUTPUT(USART_ClockInitStruct->LastBitClockPulse)); + + /*---------------------------- USART CR2 Configuration ----------------------- + * Configure USARTx CR2 (Clock signal related bits) with parameters: + * - Enable Clock Output: USART_CR2_CLKEN set + * - Clock Polarity: USART_CR2_CPOL bit according to USART_ClockInitStruct->ClockPolarity value + * - Clock Phase: USART_CR2_CPHA bit according to USART_ClockInitStruct->ClockPhase value + * - Last Bit Clock Pulse Output: USART_CR2_LBCL bit according to USART_ClockInitStruct->LastBitClockPulse value. + */ + MODIFY_REG(USARTx->CR2, + USART_CR2_CLKEN | USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_LBCL, + USART_CR2_CLKEN | USART_ClockInitStruct->ClockPolarity | + USART_ClockInitStruct->ClockPhase | USART_ClockInitStruct->LastBitClockPulse); + } + } + /* Else (USART not in Disabled state => return ERROR */ + else + { + status = ERROR; + } + + return (status); +} + +/** + * @brief Set each field of a @ref LL_USART_ClockInitTypeDef type structure to default value. + * @param USART_ClockInitStruct: pointer to a @ref LL_USART_ClockInitTypeDef structure + * whose fields will be set to default values. + * @retval None + */ +void LL_USART_ClockStructInit(LL_USART_ClockInitTypeDef *USART_ClockInitStruct) +{ + /* Set LL_USART_ClockInitStruct fields with default values */ + USART_ClockInitStruct->ClockOutput = LL_USART_CLOCK_DISABLE; + USART_ClockInitStruct->ClockPolarity = LL_USART_POLARITY_LOW; /* Not relevant when ClockOutput = LL_USART_CLOCK_DISABLE */ + USART_ClockInitStruct->ClockPhase = LL_USART_PHASE_1EDGE; /* Not relevant when ClockOutput = LL_USART_CLOCK_DISABLE */ + USART_ClockInitStruct->LastBitClockPulse = LL_USART_LASTCLKPULSE_NO_OUTPUT; /* Not relevant when ClockOutput = LL_USART_CLOCK_DISABLE */ +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +#endif /* USART1 || USART2|| USART3 || USART4 || USART5 || USART6 || USART7 || USART8 */ + +/** + * @} + */ + +#endif /* USE_FULL_LL_DRIVER */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ +