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nest-open-source / nest-detect / 1.0.2 / freertos / refs/heads/master / . / FreeRTOS / Demo / CORTEX_STM32L152_IAR / system_and_ST_code / STM32L1xx_StdPeriph_Driver / src / stm32l1xx_usart.c
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/**
******************************************************************************
* @file stm32l1xx_usart.c
* @author MCD Application Team
* @version V1.0.0RC1
* @date 07/02/2010
* @brief This file provides all the USART firmware functions.
******************************************************************************
* @copy
*
* 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>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx_usart.h"
#include "stm32l1xx_rcc.h"
/** @addtogroup STM32L1xx_StdPeriph_Driver
* @{
*/
/** @defgroup USART
* @brief USART driver modules
* @{
*/
/** @defgroup USART_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup USART_Private_Defines
* @{
*/
/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */
#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \
USART_CR1_PS | USART_CR1_TE | \
USART_CR1_RE))
/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */
#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
USART_CR2_CPHA | USART_CR2_LBCL))
/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */
#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))
/*!< USART Interrupts mask */
#define IT_MASK ((uint16_t)0x001F)
/**
* @}
*/
/** @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 peripheral.
* This parameter can be one of the following values: USART1, USART2 or USART3.
* @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);
}
}
}
/**
* @brief Initializes the USARTx peripheral according to the specified
* parameters in the USART_InitStruct .
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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;
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));
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear STOP[13:12] bits */
tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
/* 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 &= (uint32_t)~((uint32_t)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 &= (uint32_t)~((uint32_t)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 (USARTx == USART1)
{
apbclock = RCC_ClocksStatus.PCLK2_Frequency;
}
else
{
apbclock = RCC_ClocksStatus.PCLK1_Frequency;
}
/* Determine the integer part */
if ((USARTx->CR1 & USART_CR1_OVER8) != 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 & USART_CR1_OVER8) != 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.
* @retval None
*/
void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
{
uint32_t tmpreg = 0x00;
/* Check the parameters */
assert_param(IS_USART_ALL_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 &= (uint32_t)~((uint32_t)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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 |= USART_CR1_UE;
}
else
{
/* Disable the selected USART by clearing the UE bit in the CR1 register */
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);
}
}
/**
* @brief Enables or disables the specified USART interrupts.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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: 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_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));
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 USART’s DMA interface.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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.
* @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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 &= (uint16_t)~((uint16_t)USART_CR2_ADD);
/* Set the USART address node */
USARTx->CR2 |= USART_Address;
}
/**
* @brief Selects the USART WakeUp method.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);
USARTx->CR1 |= USART_WakeUp;
}
/**
* @brief Determines if the USART is in mute mode or not.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 |= USART_CR1_RWU;
}
else
{
/* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);
}
}
/**
* @brief Sets the USART LIN Break detection length.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);
USARTx->CR2 |= USART_LINBreakDetectLength;
}
/**
* @brief Enables or disables the USART’s LIN mode.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 |= USART_CR2_LINEN;
}
else
{
/* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);
}
}
/**
* @brief Transmits single data through the USARTx peripheral.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @retval None
*/
void USART_SendBreak(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Send break characters */
USARTx->CR1 |= USART_CR1_SBK;
}
/**
* @brief Sets the specified USART guard time.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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_ALL_PERIPH(USARTx));
/* Clear the USART Guard time */
USARTx->GTPR &= USART_GTPR_PSC;
/* 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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 &= USART_GTPR_GT;
/* Set the USART prescaler */
USARTx->GTPR |= USART_Prescaler;
}
/**
* @brief Enables or disables the USART’s Smart Card mode.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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_ALL_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 |= USART_CR3_SCEN;
}
else
{
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);
}
}
/**
* @brief Enables or disables NACK transmission.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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_ALL_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 |= USART_CR3_NACK;
}
else
{
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);
}
}
/**
* @brief Enables or disables the USART’s Half Duplex communication.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 |= USART_CR3_HDSEL;
}
else
{
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);
}
}
/**
* @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.
* @param NewState: new state of the USART 8x oversampling mode.
* 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 |= USART_CR1_OVER8;
}
else
{
/* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);
}
}
/**
* @brief Enables or disables the USART's one bit sampling methode.
* @param USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* USART1, USART2, USART3.
* @param NewState: new state of the USART one bit sampling methode.
* 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 |= USART_CR3_ONEBIT;
}
else
{
/* Disable tthe one bit method by clearing the ONEBITE bit in the CR3 register */
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);
}
}
/**
* @brief Configures the USART’s IrDA interface.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);
USARTx->CR3 |= USART_IrDAMode;
}
/**
* @brief Enables or disables the USART’s IrDA interface.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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 |= USART_CR3_IREN;
}
else
{
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);
}
}
/**
* @brief Checks whether the specified USART flag is set or not.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @param USART_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* @arg USART_FLAG_CTS: CTS Change flag
* @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));
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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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.
* @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));
USARTx->SR = (uint16_t)~USART_FLAG;
}
/**
* @brief Checks whether the specified USART interrupt has occurred or not.
* @param USARTx: Select the USART peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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
* @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));
/* 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 peripheral.
* This parameter can be one of the following values:
* USART1, USART2 or USART3.
* @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
* @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));
bitpos = USART_IT >> 0x08;
itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
USARTx->SR = (uint16_t)~itmask;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/