stm32f30x_usart.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f30x_usart.h"
#include "stm32f30x_rcc.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/

#define CR1_CLEAR_MASK            ((uint32_t)(USART_CR1_M | USART_CR1_PCE | \
                                              USART_CR1_PS | USART_CR1_TE | \
                                              USART_CR1_RE))

#define CR2_CLOCK_CLEAR_MASK      ((uint32_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
                                              USART_CR2_CPHA | USART_CR2_LBCL))

#define CR3_CLEAR_MASK            ((uint32_t)(USART_CR3_RTSE | USART_CR3_CTSE))

#define IT_MASK                   ((uint32_t)0x000000FF)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

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);
    }
  }
}

void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
{
  uint32_t divider = 0, apbclock = 0, tmpreg = 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));
  
  /* Disable USART */
  USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_UE);
  
  /*---------------------------- 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 = 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 = 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 = tmpreg;
  
  /*---------------------------- USART BRR Configuration -----------------------*/
  /* Configure the USART Baud Rate -------------------------------------------*/
  RCC_GetClocksFreq(&RCC_ClocksStatus);
  
  if (USARTx == USART1)
  {
    apbclock = RCC_ClocksStatus.USART1CLK_Frequency;
  }
  else if (USARTx == USART2)
  {
    apbclock = RCC_ClocksStatus.USART2CLK_Frequency;
  }
  else if (USARTx == USART3)
  {
    apbclock = RCC_ClocksStatus.USART3CLK_Frequency;
  }
  else if (USARTx == UART4)
  {
    apbclock = RCC_ClocksStatus.UART4CLK_Frequency;
  }
  else 
  {
    apbclock = RCC_ClocksStatus.UART5CLK_Frequency;
  }  
  
  /* Determine the integer part */
  if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
  {
    /* (divider * 10) computing in case Oversampling mode is 8 Samples */
    divider = (uint32_t)((2 * apbclock) / (USART_InitStruct->USART_BaudRate));
    tmpreg  = (uint32_t)((2 * apbclock) % (USART_InitStruct->USART_BaudRate));
  }
  else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
  {
    /* (divider * 10) computing in case Oversampling mode is 16 Samples */
    divider = (uint32_t)((apbclock) / (USART_InitStruct->USART_BaudRate));
    tmpreg  = (uint32_t)((apbclock) % (USART_InitStruct->USART_BaudRate));
  }
  
  /* round the divider : if fractional part i greater than 0.5 increment divider */
  if (tmpreg >=  (USART_InitStruct->USART_BaudRate) / 2)
  {
    divider++;
  } 
  
  /* Implement the divider in case Oversampling mode is 8 Samples */
  if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
  {
    /* get the LSB of divider and shift it to the right by 1 bit */
    tmpreg = (divider & (uint16_t)0x000F) >> 1;
    
    /* update the divider value */
    divider = (divider & (uint16_t)0xFFF0) | tmpreg;
  }
  
  /* Write to USART BRR */
  USARTx->BRR = (uint16_t)divider;
}

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;
}

void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
{
  uint32_t tmpreg = 0;
  /* 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, LBCL and SSM bits */
  tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
  /* Configure the USART Clock, CPOL, CPHA, LastBit and SSM ------------*/
  /* 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 = tmpreg;
}

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;
}

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 &= (uint32_t)~((uint32_t)USART_CR1_UE);
  }
}

void USART_DirectionModeCmd(USART_TypeDef* USARTx, uint32_t USART_DirectionMode, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_MODE(USART_DirectionMode));
  assert_param(IS_FUNCTIONAL_STATE(NewState)); 

  if (NewState != DISABLE)
  {
    /* Enable the USART's transfer interface by setting the TE and/or RE bits 
       in the USART CR1 register */
    USARTx->CR1 |= USART_DirectionMode;
  }
  else
  {
    /* Disable the USART's transfer interface by clearing the TE and/or RE bits
       in the USART CR3 register */
    USARTx->CR1 &= (uint32_t)~USART_DirectionMode;
  }
}

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 &= (uint32_t)~((uint32_t)USART_CR1_OVER8);
  }
}

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 ONEBIT bit in the CR3 register */
    USARTx->CR3 |= USART_CR3_ONEBIT;
  }
  else
  {
    /* Disable the one bit method by clearing the ONEBIT bit in the CR3 register */
    USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_ONEBIT);
  }
}

void USART_MSBFirstCmd(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 most significant bit first transmitted/received following the
       start bit by setting the MSBFIRST bit in the CR2 register */
    USARTx->CR2 |= USART_CR2_MSBFIRST;
  }
  else
  {
    /* Disable the most significant bit first transmitted/received following the
       start bit by clearing the MSBFIRST bit in the CR2 register */
    USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_MSBFIRST);
  }
}

void USART_DataInvCmd(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 binary data inversion feature by setting the DATAINV bit in
       the CR2 register */
    USARTx->CR2 |= USART_CR2_DATAINV;
  }
  else
  {
    /* Disable the binary data inversion feature by clearing the DATAINV bit in
       the CR2 register */
    USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_DATAINV);
  }
}

void USART_InvPinCmd(USART_TypeDef* USARTx, uint32_t USART_InvPin, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_INVERSTION_PIN(USART_InvPin));
  assert_param(IS_FUNCTIONAL_STATE(NewState)); 

  if (NewState != DISABLE)
  {
    /* Enable the active level inversion for selected pins by setting the TXINV 
       and/or RXINV bits in the USART CR2 register */
    USARTx->CR2 |= USART_InvPin;
  }
  else
  {
    /* Disable the active level inversion for selected requests by clearing the 
       TXINV and/or RXINV bits in the USART CR2 register */
    USARTx->CR2 &= (uint32_t)~USART_InvPin;
  }
}

void USART_SWAPPinCmd(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 SWAP feature by setting the SWAP bit in the CR2 register */
    USARTx->CR2 |= USART_CR2_SWAP;
  }
  else
  {
    /* Disable the SWAP feature by clearing the SWAP bit in the CR2 register */
    USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_SWAP);
  }
}

void USART_ReceiverTimeOutCmd(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 receiver time out feature by setting the RTOEN bit in the CR2 
       register */
    USARTx->CR2 |= USART_CR2_RTOEN;
  }
  else
  {
    /* Disable the receiver time out feature by clearing the RTOEN bit in the CR2 
       register */
    USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_RTOEN);
  }
}

void USART_SetReceiverTimeOut(USART_TypeDef* USARTx, uint32_t USART_ReceiverTimeOut)
{    
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_TIMEOUT(USART_ReceiverTimeOut));

  /* Clear the receiver Time Out value by clearing the RTO[23:0] bits in the RTOR
     register  */
  USARTx->RTOR &= (uint32_t)~((uint32_t)USART_RTOR_RTO);
  /* Set the receiver Time Out value by setting the RTO[23:0] bits in the RTOR
     register  */
  USARTx->RTOR |= USART_ReceiverTimeOut;
}

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;
}

void USART_STOPModeCmd(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 in STOP mode by setting the UESM bit in the CR1
       register */
    USARTx->CR1 |= USART_CR1_UESM;
  }
  else
  {
    /* Disable the selected USART in STOP mode by clearing the UE bit in the CR1
       register */
    USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_UESM);
  }
}

void USART_StopModeWakeUpSourceConfig(USART_TypeDef* USARTx, uint32_t USART_WakeUpSource)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_STOPMODE_WAKEUPSOURCE(USART_WakeUpSource));

  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_WUS);
  USARTx->CR3 |= USART_WakeUpSource;
}

void USART_AutoBaudRateCmd(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 auto baud rate feature by setting the ABREN bit in the CR2 
       register */
    USARTx->CR2 |= USART_CR2_ABREN;
  }
  else
  {
    /* Disable the auto baud rate feature by clearing the ABREN bit in the CR2 
       register */
    USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ABREN);
  }
}

void USART_AutoBaudRateConfig(USART_TypeDef* USARTx, uint32_t USART_AutoBaudRate)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_AUTOBAUDRATE_MODE(USART_AutoBaudRate));

  USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ABRMODE);
  USARTx->CR2 |= USART_AutoBaudRate;
}

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->TDR = (Data & (uint16_t)0x01FF);
}

uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));

  /* Receive Data */
  return (uint16_t)(USARTx->RDR & (uint16_t)0x01FF);
}

void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));

  /* Clear the USART address */
  USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ADD);
  /* Set the USART address node */
  USARTx->CR2 |=((uint32_t)USART_Address << (uint32_t)0x18);
}

void USART_MuteModeCmd(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 MME bit in the CR1 register */
    USARTx->CR1 |= USART_CR1_MME;
  }
  else
  {
    /* Disable the USART mute mode by clearing the MME bit in the CR1 register */
    USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_MME);
  }
}

void USART_MuteModeWakeUpConfig(USART_TypeDef* USARTx, uint32_t USART_WakeUp)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_MUTEMODE_WAKEUP(USART_WakeUp));

  USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_WAKE);
  USARTx->CR1 |= USART_WakeUp;
}

void USART_AddressDetectionConfig(USART_TypeDef* USARTx, uint32_t USART_AddressLength)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_ADDRESS_DETECTION(USART_AddressLength));

  USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ADDM7);
  USARTx->CR2 |= USART_AddressLength;
}

void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint32_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 &= (uint32_t)~((uint32_t)USART_CR2_LBDL);
  USARTx->CR2 |= USART_LINBreakDetectLength;  
}

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 &= (uint32_t)~((uint32_t)USART_CR2_LINEN);
  }
}

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 &= (uint32_t)~((uint32_t)USART_CR3_HDSEL);
  }
}

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 &= USART_GTPR_PSC;
  /* Set the USART guard time */
  USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
}

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 |= USART_CR3_SCEN;
  }
  else
  {
    /* Disable the SC mode by clearing the SCEN bit in the CR3 register */
    USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_SCEN);
  }
}

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 |= USART_CR3_NACK;
  }
  else
  {
    /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
    USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_NACK);
  }
}

void USART_SetAutoRetryCount(USART_TypeDef* USARTx, uint8_t USART_AutoCount)
{    
  /* Check the parameters */
  assert_param(IS_USART_123_PERIPH(USARTx));
  assert_param(IS_USART_AUTO_RETRY_COUNTER(USART_AutoCount));
  /* Clear the USART auto retry count */
  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_SCARCNT);
  /* Set the USART auto retry count*/
  USARTx->CR3 |= (uint32_t)((uint32_t)USART_AutoCount << 0x11);
}

void USART_SetBlockLength(USART_TypeDef* USARTx, uint8_t USART_BlockLength)
{    
  /* Check the parameters */
  assert_param(IS_USART_123_PERIPH(USARTx));

  /* Clear the Smart card block length */
  USARTx->RTOR &= (uint32_t)~((uint32_t)USART_RTOR_BLEN);
  /* Set the Smart Card block length */
  USARTx->RTOR |= (uint32_t)((uint32_t)USART_BlockLength << 0x18);
}

void USART_IrDAConfig(USART_TypeDef* USARTx, uint32_t USART_IrDAMode)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));

  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_IRLP);
  USARTx->CR3 |= USART_IrDAMode;
}

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 &= (uint32_t)~((uint32_t)USART_CR3_IREN);
  }
}
void USART_DECmd(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 DE functionality by setting the DEM bit in the CR3 register */
    USARTx->CR3 |= USART_CR3_DEM;
  }
  else
  {
    /* Disable the DE functionality by clearing the DEM bit in the CR3 register */
    USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DEM);
  }
}

void USART_DEPolarityConfig(USART_TypeDef* USARTx, uint32_t USART_DEPolarity)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_DE_POLARITY(USART_DEPolarity));

  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DEP);
  USARTx->CR3 |= USART_DEPolarity;
}

void USART_SetDEAssertionTime(USART_TypeDef* USARTx, uint32_t USART_DEAssertionTime)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_DE_ASSERTION_DEASSERTION_TIME(USART_DEAssertionTime)); 

  /* Clear the DE assertion time */
  USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_DEAT);
  /* Set the new value for the DE assertion time */
  USARTx->CR1 |=((uint32_t)USART_DEAssertionTime << (uint32_t)0x15);
}

void USART_SetDEDeassertionTime(USART_TypeDef* USARTx, uint32_t USART_DEDeassertionTime)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_DE_ASSERTION_DEASSERTION_TIME(USART_DEDeassertionTime)); 

  /* Clear the DE deassertion time */
  USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_DEDT);
  /* Set the new value for the DE deassertion time */
  USARTx->CR1 |=((uint32_t)USART_DEDeassertionTime << (uint32_t)0x10);
}

void USART_DMACmd(USART_TypeDef* USARTx, uint32_t USART_DMAReq, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_1234_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 &= (uint32_t)~USART_DMAReq;
  }
}

void USART_DMAReceptionErrorConfig(USART_TypeDef* USARTx, uint32_t USART_DMAOnError)
{
  /* Check the parameters */
  assert_param(IS_USART_1234_PERIPH(USARTx));
  assert_param(IS_USART_DMAONERROR(USART_DMAOnError)); 
  
  /* Clear the DMA Reception error detection bit */
  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DDRE);
  /* Set the new value for the DMA Reception error detection bit */
  USARTx->CR3 |= USART_DMAOnError;
}

void USART_ITConfig(USART_TypeDef* USARTx, uint32_t USART_IT, FunctionalState NewState)
{
  uint32_t usartreg = 0, itpos = 0, itmask = 0;
  uint32_t usartxbase = 0;
  /* 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 = (((uint16_t)USART_IT) >> 0x08);

  /* Get the interrupt position */
  itpos = USART_IT & IT_MASK;
  itmask = (((uint32_t)0x01) << itpos);

  if (usartreg == 0x02) /* The IT is in CR2 register */
  {
    usartxbase += 0x04;
  }
  else if (usartreg == 0x03) /* The IT is in CR3 register */
  {
    usartxbase += 0x08;
  }
  else /* The IT is in CR1 register */
  {
  }
  if (NewState != DISABLE)
  {
    *(__IO uint32_t*)usartxbase  |= itmask;
  }
  else
  {
    *(__IO uint32_t*)usartxbase &= ~itmask;
  }
}

void USART_RequestCmd(USART_TypeDef* USARTx, uint32_t USART_Request, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_REQUEST(USART_Request));
  assert_param(IS_FUNCTIONAL_STATE(NewState)); 

  if (NewState != DISABLE)
  {
    /* Enable the USART ReQuest by setting the dedicated request bit in the RQR
       register.*/
    USARTx->RQR |= USART_Request;
  }
  else
  {
    /* Disable the USART ReQuest by clearing the dedicated request bit in the RQR
       register.*/
    USARTx->RQR &= (uint32_t)~USART_Request;
  }
}

void USART_OverrunDetectionConfig(USART_TypeDef* USARTx, uint32_t USART_OVRDetection)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_OVRDETECTION(USART_OVRDetection));
  
  /* Clear the OVR detection bit */
  USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_OVRDIS);
  /* Set the new value for the OVR detection bit */
  USARTx->CR3 |= USART_OVRDetection;
}

FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint32_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->ISR & USART_FLAG) != (uint16_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

void USART_ClearFlag(USART_TypeDef* USARTx, uint32_t USART_FLAG)
{
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
     
  USARTx->ICR = USART_FLAG;
}

ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint32_t USART_IT)
{
  uint32_t bitpos = 0, itmask = 0, usartreg = 0;
  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 = (((uint16_t)USART_IT) >> 0x08);
  /* 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 >> 0x10;
  bitpos = (uint32_t)0x01 << bitpos;
  bitpos &= USARTx->ISR;
  if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  
  return bitstatus;  
}

void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint32_t USART_IT)
{
  uint32_t bitpos = 0, itmask = 0;
  /* Check the parameters */
  assert_param(IS_USART_ALL_PERIPH(USARTx));
  assert_param(IS_USART_CLEAR_IT(USART_IT)); 
  
  bitpos = USART_IT >> 0x10;
  itmask = ((uint32_t)0x01 << (uint32_t)bitpos);
  USARTx->ICR = (uint32_t)itmask;
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/