mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/stm32f10x_usart.c
- Revision:
- 52:a51c77007319
- Child:
- 70:c1fbde68b492
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F103RB/stm32f10x_usart.c Mon Dec 02 11:30:05 2013 +0000 @@ -0,0 +1,1058 @@ +/** + ****************************************************************************** + * @file stm32f10x_usart.c + * @author MCD Application Team + * @version V3.5.0 + * @date 11-March-2011 + * @brief This file provides all the USART firmware functions. + ****************************************************************************** + * @attention + * + * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS + * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE + * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY + * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING + * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE + * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. + * + * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2> + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "stm32f10x_usart.h" +#include "stm32f10x_rcc.h" + +/** @addtogroup STM32F10x_StdPeriph_Driver + * @{ + */ + +/** @defgroup USART + * @brief USART driver modules + * @{ + */ + +/** @defgroup USART_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @defgroup USART_Private_Defines + * @{ + */ + +#define CR1_UE_Set ((uint16_t)0x2000) /*!< USART Enable Mask */ +#define CR1_UE_Reset ((uint16_t)0xDFFF) /*!< USART Disable Mask */ + +#define CR1_WAKE_Mask ((uint16_t)0xF7FF) /*!< USART WakeUp Method Mask */ + +#define CR1_RWU_Set ((uint16_t)0x0002) /*!< USART mute mode Enable Mask */ +#define CR1_RWU_Reset ((uint16_t)0xFFFD) /*!< USART mute mode Enable Mask */ +#define CR1_SBK_Set ((uint16_t)0x0001) /*!< USART Break Character send Mask */ +#define CR1_CLEAR_Mask ((uint16_t)0xE9F3) /*!< USART CR1 Mask */ +#define CR2_Address_Mask ((uint16_t)0xFFF0) /*!< USART address Mask */ + +#define CR2_LINEN_Set ((uint16_t)0x4000) /*!< USART LIN Enable Mask */ +#define CR2_LINEN_Reset ((uint16_t)0xBFFF) /*!< USART LIN Disable Mask */ + +#define CR2_LBDL_Mask ((uint16_t)0xFFDF) /*!< USART LIN Break detection Mask */ +#define CR2_STOP_CLEAR_Mask ((uint16_t)0xCFFF) /*!< USART CR2 STOP Bits Mask */ +#define CR2_CLOCK_CLEAR_Mask ((uint16_t)0xF0FF) /*!< USART CR2 Clock Mask */ + +#define CR3_SCEN_Set ((uint16_t)0x0020) /*!< USART SC Enable Mask */ +#define CR3_SCEN_Reset ((uint16_t)0xFFDF) /*!< USART SC Disable Mask */ + +#define CR3_NACK_Set ((uint16_t)0x0010) /*!< USART SC NACK Enable Mask */ +#define CR3_NACK_Reset ((uint16_t)0xFFEF) /*!< USART SC NACK Disable Mask */ + +#define CR3_HDSEL_Set ((uint16_t)0x0008) /*!< USART Half-Duplex Enable Mask */ +#define CR3_HDSEL_Reset ((uint16_t)0xFFF7) /*!< USART Half-Duplex Disable Mask */ + +#define CR3_IRLP_Mask ((uint16_t)0xFFFB) /*!< USART IrDA LowPower mode Mask */ +#define CR3_CLEAR_Mask ((uint16_t)0xFCFF) /*!< USART CR3 Mask */ + +#define CR3_IREN_Set ((uint16_t)0x0002) /*!< USART IrDA Enable Mask */ +#define CR3_IREN_Reset ((uint16_t)0xFFFD) /*!< USART IrDA Disable Mask */ +#define GTPR_LSB_Mask ((uint16_t)0x00FF) /*!< Guard Time Register LSB Mask */ +#define GTPR_MSB_Mask ((uint16_t)0xFF00) /*!< Guard Time Register MSB Mask */ +#define IT_Mask ((uint16_t)0x001F) /*!< USART Interrupt Mask */ + +/* USART OverSampling-8 Mask */ +#define CR1_OVER8_Set ((u16)0x8000) /* USART OVER8 mode Enable Mask */ +#define CR1_OVER8_Reset ((u16)0x7FFF) /* USART OVER8 mode Disable Mask */ + +/* USART One Bit Sampling Mask */ +#define CR3_ONEBITE_Set ((u16)0x0800) /* USART ONEBITE mode Enable Mask */ +#define CR3_ONEBITE_Reset ((u16)0xF7FF) /* USART ONEBITE mode Disable Mask */ + +/** + * @} + */ + +/** @defgroup USART_Private_Macros + * @{ + */ + +/** + * @} + */ + +/** @defgroup USART_Private_Variables + * @{ + */ + +/** + * @} + */ + +/** @defgroup USART_Private_FunctionPrototypes + * @{ + */ + +/** + * @} + */ + +/** @defgroup USART_Private_Functions + * @{ + */ + +/** + * @brief Deinitializes the USARTx peripheral registers to their default reset values. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @retval None + */ +void USART_DeInit(USART_TypeDef* USARTx) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + + if (USARTx == USART1) + { + RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE); + RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE); + } + else if (USARTx == USART2) + { + RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE); + RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE); + } + else if (USARTx == USART3) + { + RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE); + RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE); + } + else if (USARTx == UART4) + { + RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE); + RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE); + } + else + { + if (USARTx == UART5) + { + RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE); + RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE); + } + } +} + +/** + * @brief Initializes the USARTx peripheral according to the specified + * parameters in the USART_InitStruct . + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_InitStruct: pointer to a USART_InitTypeDef structure + * that contains the configuration information for the specified USART + * peripheral. + * @retval None + */ +void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct) +{ + uint32_t tmpreg = 0x00, apbclock = 0x00; + uint32_t integerdivider = 0x00; + uint32_t fractionaldivider = 0x00; + uint32_t usartxbase = 0; + RCC_ClocksTypeDef RCC_ClocksStatus; + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate)); + assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength)); + assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits)); + assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity)); + assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode)); + assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl)); + /* The hardware flow control is available only for USART1, USART2 and USART3 */ + if (USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + usartxbase = (uint32_t)USARTx; + +/*---------------------------- USART CR2 Configuration -----------------------*/ + tmpreg = USARTx->CR2; + /* Clear STOP[13:12] bits */ + tmpreg &= CR2_STOP_CLEAR_Mask; + /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/ + /* Set STOP[13:12] bits according to USART_StopBits value */ + tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits; + + /* Write to USART CR2 */ + USARTx->CR2 = (uint16_t)tmpreg; + +/*---------------------------- USART CR1 Configuration -----------------------*/ + tmpreg = USARTx->CR1; + /* Clear M, PCE, PS, TE and RE bits */ + tmpreg &= CR1_CLEAR_Mask; + /* Configure the USART Word Length, Parity and mode ----------------------- */ + /* Set the M bits according to USART_WordLength value */ + /* Set PCE and PS bits according to USART_Parity value */ + /* Set TE and RE bits according to USART_Mode value */ + tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity | + USART_InitStruct->USART_Mode; + /* Write to USART CR1 */ + USARTx->CR1 = (uint16_t)tmpreg; + +/*---------------------------- USART CR3 Configuration -----------------------*/ + tmpreg = USARTx->CR3; + /* Clear CTSE and RTSE bits */ + tmpreg &= CR3_CLEAR_Mask; + /* Configure the USART HFC -------------------------------------------------*/ + /* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */ + tmpreg |= USART_InitStruct->USART_HardwareFlowControl; + /* Write to USART CR3 */ + USARTx->CR3 = (uint16_t)tmpreg; + +/*---------------------------- USART BRR Configuration -----------------------*/ + /* Configure the USART Baud Rate -------------------------------------------*/ + RCC_GetClocksFreq(&RCC_ClocksStatus); + if (usartxbase == USART1_BASE) + { + apbclock = RCC_ClocksStatus.PCLK2_Frequency; + } + else + { + apbclock = RCC_ClocksStatus.PCLK1_Frequency; + } + + /* Determine the integer part */ + if ((USARTx->CR1 & CR1_OVER8_Set) != 0) + { + /* Integer part computing in case Oversampling mode is 8 Samples */ + integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate))); + } + else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */ + { + /* Integer part computing in case Oversampling mode is 16 Samples */ + integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate))); + } + tmpreg = (integerdivider / 100) << 4; + + /* Determine the fractional part */ + fractionaldivider = integerdivider - (100 * (tmpreg >> 4)); + + /* Implement the fractional part in the register */ + if ((USARTx->CR1 & CR1_OVER8_Set) != 0) + { + tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07); + } + else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */ + { + tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F); + } + + /* Write to USART BRR */ + USARTx->BRR = (uint16_t)tmpreg; +} + +/** + * @brief Fills each USART_InitStruct member with its default value. + * @param USART_InitStruct: pointer to a USART_InitTypeDef structure + * which will be initialized. + * @retval None + */ +void USART_StructInit(USART_InitTypeDef* USART_InitStruct) +{ + /* USART_InitStruct members default value */ + USART_InitStruct->USART_BaudRate = 9600; + USART_InitStruct->USART_WordLength = USART_WordLength_8b; + USART_InitStruct->USART_StopBits = USART_StopBits_1; + USART_InitStruct->USART_Parity = USART_Parity_No ; + USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx; + USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None; +} + +/** + * @brief Initializes the USARTx peripheral Clock according to the + * specified parameters in the USART_ClockInitStruct . + * @param USARTx: where x can be 1, 2, 3 to select the USART peripheral. + * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef + * structure that contains the configuration information for the specified + * USART peripheral. + * @note The Smart Card and Synchronous modes are not available for UART4 and UART5. + * @retval None + */ +void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct) +{ + uint32_t tmpreg = 0x00; + /* Check the parameters */ + assert_param(IS_USART_123_PERIPH(USARTx)); + assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock)); + assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL)); + assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA)); + assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit)); + +/*---------------------------- USART CR2 Configuration -----------------------*/ + tmpreg = USARTx->CR2; + /* Clear CLKEN, CPOL, CPHA and LBCL bits */ + tmpreg &= CR2_CLOCK_CLEAR_Mask; + /* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/ + /* Set CLKEN bit according to USART_Clock value */ + /* Set CPOL bit according to USART_CPOL value */ + /* Set CPHA bit according to USART_CPHA value */ + /* Set LBCL bit according to USART_LastBit value */ + tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL | + USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit; + /* Write to USART CR2 */ + USARTx->CR2 = (uint16_t)tmpreg; +} + +/** + * @brief Fills each USART_ClockInitStruct member with its default value. + * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef + * structure which will be initialized. + * @retval None + */ +void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct) +{ + /* USART_ClockInitStruct members default value */ + USART_ClockInitStruct->USART_Clock = USART_Clock_Disable; + USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low; + USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge; + USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable; +} + +/** + * @brief Enables or disables the specified USART peripheral. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USARTx peripheral. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the selected USART by setting the UE bit in the CR1 register */ + USARTx->CR1 |= CR1_UE_Set; + } + else + { + /* Disable the selected USART by clearing the UE bit in the CR1 register */ + USARTx->CR1 &= CR1_UE_Reset; + } +} + +/** + * @brief Enables or disables the specified USART interrupts. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled. + * This parameter can be one of the following values: + * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) + * @arg USART_IT_LBD: LIN Break detection interrupt + * @arg USART_IT_TXE: Transmit Data Register empty interrupt + * @arg USART_IT_TC: Transmission complete interrupt + * @arg USART_IT_RXNE: Receive Data register not empty interrupt + * @arg USART_IT_IDLE: Idle line detection interrupt + * @arg USART_IT_PE: Parity Error interrupt + * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error) + * @param NewState: new state of the specified USARTx interrupts. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState) +{ + uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00; + uint32_t usartxbase = 0x00; + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_CONFIG_IT(USART_IT)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + /* The CTS interrupt is not available for UART4 and UART5 */ + if (USART_IT == USART_IT_CTS) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + usartxbase = (uint32_t)USARTx; + + /* Get the USART register index */ + usartreg = (((uint8_t)USART_IT) >> 0x05); + + /* Get the interrupt position */ + itpos = USART_IT & IT_Mask; + itmask = (((uint32_t)0x01) << itpos); + + if (usartreg == 0x01) /* The IT is in CR1 register */ + { + usartxbase += 0x0C; + } + else if (usartreg == 0x02) /* The IT is in CR2 register */ + { + usartxbase += 0x10; + } + else /* The IT is in CR3 register */ + { + usartxbase += 0x14; + } + if (NewState != DISABLE) + { + *(__IO uint32_t*)usartxbase |= itmask; + } + else + { + *(__IO uint32_t*)usartxbase &= ~itmask; + } +} + +/** + * @brief Enables or disables the USARTs DMA interface. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_DMAReq: specifies the DMA request. + * This parameter can be any combination of the following values: + * @arg USART_DMAReq_Tx: USART DMA transmit request + * @arg USART_DMAReq_Rx: USART DMA receive request + * @param NewState: new state of the DMA Request sources. + * This parameter can be: ENABLE or DISABLE. + * @note The DMA mode is not available for UART5 except in the STM32 + * High density value line devices(STM32F10X_HD_VL). + * @retval None + */ +void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_DMAREQ(USART_DMAReq)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the DMA transfer for selected requests by setting the DMAT and/or + DMAR bits in the USART CR3 register */ + USARTx->CR3 |= USART_DMAReq; + } + else + { + /* Disable the DMA transfer for selected requests by clearing the DMAT and/or + DMAR bits in the USART CR3 register */ + USARTx->CR3 &= (uint16_t)~USART_DMAReq; + } +} + +/** + * @brief Sets the address of the USART node. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_Address: Indicates the address of the USART node. + * @retval None + */ +void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_ADDRESS(USART_Address)); + + /* Clear the USART address */ + USARTx->CR2 &= CR2_Address_Mask; + /* Set the USART address node */ + USARTx->CR2 |= USART_Address; +} + +/** + * @brief Selects the USART WakeUp method. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_WakeUp: specifies the USART wakeup method. + * This parameter can be one of the following values: + * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection + * @arg USART_WakeUp_AddressMark: WakeUp by an address mark + * @retval None + */ +void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_WAKEUP(USART_WakeUp)); + + USARTx->CR1 &= CR1_WAKE_Mask; + USARTx->CR1 |= USART_WakeUp; +} + +/** + * @brief Determines if the USART is in mute mode or not. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USART mute mode. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the USART mute mode by setting the RWU bit in the CR1 register */ + USARTx->CR1 |= CR1_RWU_Set; + } + else + { + /* Disable the USART mute mode by clearing the RWU bit in the CR1 register */ + USARTx->CR1 &= CR1_RWU_Reset; + } +} + +/** + * @brief Sets the USART LIN Break detection length. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_LINBreakDetectLength: specifies the LIN break detection length. + * This parameter can be one of the following values: + * @arg USART_LINBreakDetectLength_10b: 10-bit break detection + * @arg USART_LINBreakDetectLength_11b: 11-bit break detection + * @retval None + */ +void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength)); + + USARTx->CR2 &= CR2_LBDL_Mask; + USARTx->CR2 |= USART_LINBreakDetectLength; +} + +/** + * @brief Enables or disables the USARTs LIN mode. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USART LIN mode. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the LIN mode by setting the LINEN bit in the CR2 register */ + USARTx->CR2 |= CR2_LINEN_Set; + } + else + { + /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */ + USARTx->CR2 &= CR2_LINEN_Reset; + } +} + +/** + * @brief Transmits single data through the USARTx peripheral. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param Data: the data to transmit. + * @retval None + */ +void USART_SendData(USART_TypeDef* USARTx, uint16_t Data) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_DATA(Data)); + + /* Transmit Data */ + USARTx->DR = (Data & (uint16_t)0x01FF); +} + +/** + * @brief Returns the most recent received data by the USARTx peripheral. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @retval The received data. + */ +uint16_t USART_ReceiveData(USART_TypeDef* USARTx) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + + /* Receive Data */ + return (uint16_t)(USARTx->DR & (uint16_t)0x01FF); +} + +/** + * @brief Transmits break characters. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @retval None + */ +void USART_SendBreak(USART_TypeDef* USARTx) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + + /* Send break characters */ + USARTx->CR1 |= CR1_SBK_Set; +} + +/** + * @brief Sets the specified USART guard time. + * @param USARTx: where x can be 1, 2 or 3 to select the USART peripheral. + * @param USART_GuardTime: specifies the guard time. + * @note The guard time bits are not available for UART4 and UART5. + * @retval None + */ +void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime) +{ + /* Check the parameters */ + assert_param(IS_USART_123_PERIPH(USARTx)); + + /* Clear the USART Guard time */ + USARTx->GTPR &= GTPR_LSB_Mask; + /* Set the USART guard time */ + USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08); +} + +/** + * @brief Sets the system clock prescaler. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_Prescaler: specifies the prescaler clock. + * @note The function is used for IrDA mode with UART4 and UART5. + * @retval None + */ +void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + + /* Clear the USART prescaler */ + USARTx->GTPR &= GTPR_MSB_Mask; + /* Set the USART prescaler */ + USARTx->GTPR |= USART_Prescaler; +} + +/** + * @brief Enables or disables the USARTs Smart Card mode. + * @param USARTx: where x can be 1, 2 or 3 to select the USART peripheral. + * @param NewState: new state of the Smart Card mode. + * This parameter can be: ENABLE or DISABLE. + * @note The Smart Card mode is not available for UART4 and UART5. + * @retval None + */ +void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_123_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the SC mode by setting the SCEN bit in the CR3 register */ + USARTx->CR3 |= CR3_SCEN_Set; + } + else + { + /* Disable the SC mode by clearing the SCEN bit in the CR3 register */ + USARTx->CR3 &= CR3_SCEN_Reset; + } +} + +/** + * @brief Enables or disables NACK transmission. + * @param USARTx: where x can be 1, 2 or 3 to select the USART peripheral. + * @param NewState: new state of the NACK transmission. + * This parameter can be: ENABLE or DISABLE. + * @note The Smart Card mode is not available for UART4 and UART5. + * @retval None + */ +void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_123_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + if (NewState != DISABLE) + { + /* Enable the NACK transmission by setting the NACK bit in the CR3 register */ + USARTx->CR3 |= CR3_NACK_Set; + } + else + { + /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */ + USARTx->CR3 &= CR3_NACK_Reset; + } +} + +/** + * @brief Enables or disables the USARTs Half Duplex communication. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USART Communication. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */ + USARTx->CR3 |= CR3_HDSEL_Set; + } + else + { + /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */ + USARTx->CR3 &= CR3_HDSEL_Reset; + } +} + + +/** + * @brief Enables or disables the USART's 8x oversampling mode. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USART one bit sampling method. + * This parameter can be: ENABLE or DISABLE. + * @note + * This function has to be called before calling USART_Init() + * function in order to have correct baudrate Divider value. + * @retval None + */ +void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */ + USARTx->CR1 |= CR1_OVER8_Set; + } + else + { + /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */ + USARTx->CR1 &= CR1_OVER8_Reset; + } +} + +/** + * @brief Enables or disables the USART's one bit sampling method. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the USART one bit sampling method. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */ + USARTx->CR3 |= CR3_ONEBITE_Set; + } + else + { + /* Disable tthe one bit method by clearing the ONEBITE bit in the CR3 register */ + USARTx->CR3 &= CR3_ONEBITE_Reset; + } +} + +/** + * @brief Configures the USART's IrDA interface. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_IrDAMode: specifies the IrDA mode. + * This parameter can be one of the following values: + * @arg USART_IrDAMode_LowPower + * @arg USART_IrDAMode_Normal + * @retval None + */ +void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_IRDA_MODE(USART_IrDAMode)); + + USARTx->CR3 &= CR3_IRLP_Mask; + USARTx->CR3 |= USART_IrDAMode; +} + +/** + * @brief Enables or disables the USART's IrDA interface. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param NewState: new state of the IrDA mode. + * This parameter can be: ENABLE or DISABLE. + * @retval None + */ +void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_FUNCTIONAL_STATE(NewState)); + + if (NewState != DISABLE) + { + /* Enable the IrDA mode by setting the IREN bit in the CR3 register */ + USARTx->CR3 |= CR3_IREN_Set; + } + else + { + /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */ + USARTx->CR3 &= CR3_IREN_Reset; + } +} + +/** + * @brief Checks whether the specified USART flag is set or not. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_FLAG: specifies the flag to check. + * This parameter can be one of the following values: + * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5) + * @arg USART_FLAG_LBD: LIN Break detection flag + * @arg USART_FLAG_TXE: Transmit data register empty flag + * @arg USART_FLAG_TC: Transmission Complete flag + * @arg USART_FLAG_RXNE: Receive data register not empty flag + * @arg USART_FLAG_IDLE: Idle Line detection flag + * @arg USART_FLAG_ORE: OverRun Error flag + * @arg USART_FLAG_NE: Noise Error flag + * @arg USART_FLAG_FE: Framing Error flag + * @arg USART_FLAG_PE: Parity Error flag + * @retval The new state of USART_FLAG (SET or RESET). + */ +FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG) +{ + FlagStatus bitstatus = RESET; + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_FLAG(USART_FLAG)); + /* The CTS flag is not available for UART4 and UART5 */ + if (USART_FLAG == USART_FLAG_CTS) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET) + { + bitstatus = SET; + } + else + { + bitstatus = RESET; + } + return bitstatus; +} + +/** + * @brief Clears the USARTx's pending flags. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_FLAG: specifies the flag to clear. + * This parameter can be any combination of the following values: + * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5). + * @arg USART_FLAG_LBD: LIN Break detection flag. + * @arg USART_FLAG_TC: Transmission Complete flag. + * @arg USART_FLAG_RXNE: Receive data register not empty flag. + * + * @note + * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun + * error) and IDLE (Idle line detected) flags are cleared by software + * sequence: a read operation to USART_SR register (USART_GetFlagStatus()) + * followed by a read operation to USART_DR register (USART_ReceiveData()). + * - RXNE flag can be also cleared by a read to the USART_DR register + * (USART_ReceiveData()). + * - TC flag can be also cleared by software sequence: a read operation to + * USART_SR register (USART_GetFlagStatus()) followed by a write operation + * to USART_DR register (USART_SendData()). + * - TXE flag is cleared only by a write to the USART_DR register + * (USART_SendData()). + * @retval None + */ +void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG) +{ + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_CLEAR_FLAG(USART_FLAG)); + /* The CTS flag is not available for UART4 and UART5 */ + if ((USART_FLAG & USART_FLAG_CTS) == USART_FLAG_CTS) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + USARTx->SR = (uint16_t)~USART_FLAG; +} + +/** + * @brief Checks whether the specified USART interrupt has occurred or not. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_IT: specifies the USART interrupt source to check. + * This parameter can be one of the following values: + * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) + * @arg USART_IT_LBD: LIN Break detection interrupt + * @arg USART_IT_TXE: Tansmit Data Register empty interrupt + * @arg USART_IT_TC: Transmission complete interrupt + * @arg USART_IT_RXNE: Receive Data register not empty interrupt + * @arg USART_IT_IDLE: Idle line detection interrupt + * @arg USART_IT_ORE: OverRun Error interrupt + * @arg USART_IT_NE: Noise Error interrupt + * @arg USART_IT_FE: Framing Error interrupt + * @arg USART_IT_PE: Parity Error interrupt + * @retval The new state of USART_IT (SET or RESET). + */ +ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT) +{ + uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00; + ITStatus bitstatus = RESET; + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_GET_IT(USART_IT)); + /* The CTS interrupt is not available for UART4 and UART5 */ + if (USART_IT == USART_IT_CTS) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + /* Get the USART register index */ + usartreg = (((uint8_t)USART_IT) >> 0x05); + /* Get the interrupt position */ + itmask = USART_IT & IT_Mask; + itmask = (uint32_t)0x01 << itmask; + + if (usartreg == 0x01) /* The IT is in CR1 register */ + { + itmask &= USARTx->CR1; + } + else if (usartreg == 0x02) /* The IT is in CR2 register */ + { + itmask &= USARTx->CR2; + } + else /* The IT is in CR3 register */ + { + itmask &= USARTx->CR3; + } + + bitpos = USART_IT >> 0x08; + bitpos = (uint32_t)0x01 << bitpos; + bitpos &= USARTx->SR; + if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET)) + { + bitstatus = SET; + } + else + { + bitstatus = RESET; + } + + return bitstatus; +} + +/** + * @brief Clears the USARTx's interrupt pending bits. + * @param USARTx: Select the USART or the UART peripheral. + * This parameter can be one of the following values: + * USART1, USART2, USART3, UART4 or UART5. + * @param USART_IT: specifies the interrupt pending bit to clear. + * This parameter can be one of the following values: + * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) + * @arg USART_IT_LBD: LIN Break detection interrupt + * @arg USART_IT_TC: Transmission complete interrupt. + * @arg USART_IT_RXNE: Receive Data register not empty interrupt. + * + * @note + * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun + * error) and IDLE (Idle line detected) pending bits are cleared by + * software sequence: a read operation to USART_SR register + * (USART_GetITStatus()) followed by a read operation to USART_DR register + * (USART_ReceiveData()). + * - RXNE pending bit can be also cleared by a read to the USART_DR register + * (USART_ReceiveData()). + * - TC pending bit can be also cleared by software sequence: a read + * operation to USART_SR register (USART_GetITStatus()) followed by a write + * operation to USART_DR register (USART_SendData()). + * - TXE pending bit is cleared only by a write to the USART_DR register + * (USART_SendData()). + * @retval None + */ +void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT) +{ + uint16_t bitpos = 0x00, itmask = 0x00; + /* Check the parameters */ + assert_param(IS_USART_ALL_PERIPH(USARTx)); + assert_param(IS_USART_CLEAR_IT(USART_IT)); + /* The CTS interrupt is not available for UART4 and UART5 */ + if (USART_IT == USART_IT_CTS) + { + assert_param(IS_USART_123_PERIPH(USARTx)); + } + + bitpos = USART_IT >> 0x08; + itmask = ((uint16_t)0x01 << (uint16_t)bitpos); + USARTx->SR = (uint16_t)~itmask; +} +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/