text: /******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
  * File Name          : uart.c
  * Author             : MCD Application Team
  * Date First Issued  : 06/08/2003
  * Description        : This file provides all the UART software functions
  ********************************************************************************
  * History:
  *  13/01/2006 : V3.1
  *  24/05/2005 : V3.0
  *  30/11/2004 : V2.0
  *  14/07/2004 : V1.3
  *  01/01/2004 : V1.2
  *******************************************************************************
   THE PRESENT SOFTWARE 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 SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
   CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *******************************************************************************/
  
  #include "uart.h"
  
  /*******************************************************************************
  * Function Name  : UART_Init
  * Description    : This function initializes the selected UART registers to 
  *                  their reset values
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_Init(UART_TypeDef *UARTx)
  { 
    UARTx->CR = 0x0000;
    UARTx->IER = 0x0000;
    (void)UARTx->RxBUFR;
    UARTx->RxRSTR = 0xFFFF;
    UARTx->TxRSTR = 0xFFFF;
    UARTx->TOR = 0x0000;
    UARTx->GTR = 0x0000;
  }
  
  /*******************************************************************************
  * Function Name  : UART_BaudRateConfig
  * Description    : This function configures the baud rate of the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : u32 The baudrate value
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_BaudRateConfig(UART_TypeDef *UARTx, u32 BaudRate)
  {
    UARTx->BR = (u16)(RCCU_FrequencyValue(RCCU_FCLK)/(16*BaudRate));
  }
  
  /*******************************************************************************
  * Function Name  : UART_Config
  * Description    : This function configures the baudrate, the mode, the data
  *                  parity and the number of stop bits of the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : u32 The baudrate value
  * Input 3        : The parity type, it can be UART_EVEN_PARITY, UART_ODD_PARITY
  *		   or UART_NO_PARITY
  * Input 4        : The number of stop bits UART_0_5_StopBits, UART_1_StopBits, 
  *                  UART_1_5_StopBits or UART_2_StopBits
  * Input 5        : The UART mode, it can be
  *                  UARTM_8D 	for 8-bit data format
  *                  UARTM_7D_P 	for 7-bit data + parity format
  *                  UART_9D 	for 9-bit data format
  *                  UART_8D_W	for 8-bit data + wake-up bit format
  *                  UART_8D_P	for 8-bit data + parity bit format   
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_Config(UART_TypeDef *UARTx, u32 BaudRate, UARTParity_TypeDef Parity,
                   UARTStopBits_TypeDef StopBits, UARTMode_TypeDef Mode)
  {
    UART_ModeConfig(UARTx, Mode);
    UART_BaudRateConfig(UARTx, BaudRate);
    UART_ParityConfig(UARTx, Parity);
    UART_StopBitsConfig(UARTx, StopBits);
  }
  
  /*******************************************************************************
  * Function Name  : UART_ItConfig
  * Description    : This function enables or disables one or several interrupt
  *                  sources of the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : The new interrupt flag or flags    
  * Input 3        : ENABLE or DISABLE
  * Output         : None
  * Return         : None
  * Note           : The UART interrupt flags are listed in the file uart.h
  *******************************************************************************/
  void UART_ItConfig(UART_TypeDef *UARTx, u16 UART_Flag, FunctionalState NewState)
  {
    if (NewState==ENABLE) UARTx->IER|=UART_Flag; else UARTx->IER&=~UART_Flag;
  }
  
  /*******************************************************************************
  * Function Name  : UART_FifoConfig
  * Description    : This function enables or disables the Rx and Tx FIFOs of
  *                  the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : ENABLE or DISABLE
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_FifoConfig(UART_TypeDef *UARTx, FunctionalState NewState)
  {
    if (NewState==ENABLE) UARTx->CR|=0x0400; else UARTx->CR&=~0x0400;
  }
  
  /*******************************************************************************
  * Function Name  : UART_FifoReset
  * Description    : This function resets the Rx and the Tx FIFOs of the
  *                  selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : UART_RxFIFO or UART_TxFIFO
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_FifoReset(UART_TypeDef *UARTx, UARTFIFO_TypeDef FIFO)
  {
    if (FIFO==UART_RxFIFO) UARTx->RxRSTR=0xFFFF; else UARTx->TxRSTR=0xFFFF;
  }
  
  /*******************************************************************************
  * Function Name  : UART_LoopBackConfig
  * Description    : This function enables or disables the loop back mode of
  *                  the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : ENABLE or DISABLE
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_LoopBackConfig(UART_TypeDef *UARTx, FunctionalState NewState)
  {
    if (NewState==ENABLE) UARTx->CR|=0x0040; else UARTx->CR&=~0x0040;
  }
  
  /*******************************************************************************
  * Function Name  : UART_RxConfig
  * Description    : This function enables or disables the UART data reception.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : ENABLE or DISABLE
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_RxConfig(UART_TypeDef *UARTx, FunctionalState NewState)
  {
    if (NewState==ENABLE) UARTx->CR|=0x0100; else UARTx->CR&=~0x0100;
  }
  
  /*******************************************************************************
  * Function Name  : UART_OnOffConfig
  * Description    : This function sets On/Off the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : ENABLE or DISABLE
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_OnOffConfig(UART_TypeDef *UARTx, FunctionalState NewState)
  {
    if (NewState==ENABLE) UARTx->CR|=0x0080; else UARTx->CR&=~0x0080;
  }
  
  /*******************************************************************************
  * Function Name  : UART_ByteSend
  * Description    : This function sends a data byte to the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the data byte to send
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_ByteSend(UART_TypeDef *UARTx, u8 *Data)
  {
   /* if FIFO ENABLED */  
   if (UARTx->CR & 0x0400)
  
      /* Wait until the TxFIFO contains at least 1 free place */
      while((UARTx->SR & UART_TxFull));
  
   /* if FIFO DISABLED */  
   else 
  
      /* Wait until the transmit shift register is empty */
      while (!(UARTx->SR & UART_TxEmpty));
  
    UARTx->TxBUFR = *Data;
  }
  
  /*******************************************************************************
  * Function Name  : UART_9BitByteSend
  * Description    : This function sends a 9-bit data to the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the 9-bit data to send
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_9BitByteSend(UART_TypeDef *UARTx, u16 *Data)
  {
   /* if FIFO ENABLED */  
   if(UARTx->CR & 0x0400)
  
      /* Wait until the TxFIFO contains at least 1 free place */    
      while((UARTx->SR & UART_TxFull));
  
   /* if FIFO DISABLED */  
   else
  
      /* Wait until the transmit shift register is empty */
      while (!(UARTx->SR & UART_TxEmpty)); 
  
    UARTx->TxBUFR = ((*Data) & 0x01FF);
  }
  
  /*******************************************************************************
  * Function Name  : UART_DataSend
  * Description    : This function sends several data bytes to the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the data to send
  * Input 3        : The data length in bytes
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_DataSend(UART_TypeDef *UARTx, u8 *Data, u8 DataLength)
  {
    
   while(DataLength--)
    {
      UART_ByteSend(UARTx,Data);
      Data++;
    }
  }
  
  /*******************************************************************************
  * Function Name  : UART_9BitDataSend
  * Description    : This function sends several 9-bit data to the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer to the data to send
  * Input 3        : The data length 
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_9BitDataSend(UART_TypeDef *UARTx, u16 *Data, u8 DataLength)
  {
     while(DataLength--)
    {
      UART_9BitByteSend(UARTx,Data);
      Data++;
    }
  }
  
  /*******************************************************************************
  * Function Name  : UART_StringSend
  * Description    : This function sends a string to the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the string to send
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void UART_StringSend(UART_TypeDef *UARTx, u8 *String)
  {
    u8 *Data=String;
    while(*Data != '\0')
      UART_ByteSend(UARTx, Data++);
     *Data='\0';
    UART_ByteSend(UARTx, Data);
  }
  
  /*******************************************************************************
  * Function Name  : UART_ByteReceive
  * Description    : This function gets a data byte from the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the data where the data will be stored
  * Input 3        : The time-out period
  * Output         : The received 8-bit data
  * Return         : The UARTx.SR register content
  *******************************************************************************/
  u16 UART_ByteReceive(UART_TypeDef *UARTx, u8 *Data, u8 TimeOut)
  {
     u16 wStatus = 0;
  
  /* reload the Timeout counter */
     UARTx->TOR=TimeOut;
  
  /* while the UART_RxFIFO is empty and no Timeoutidle */
     while (!((wStatus=UARTx->SR) & (UART_TimeOutIdle|UART_RxHalfFull|UART_RxBufFull)));
  
  /* then read the Receive Buffer Register */
     *Data = (u8)UARTx->RxBUFR;
  
     return wStatus;
  }
  
  /*******************************************************************************
  * Function Name  : UART_9BitByteReceive
  * Description    : This function gets a 9-bit data from the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the buffer where the data will be stored
  * Input 3        : The time-out period value
  * Output         : The received 9-bit data
  * Return         : The UARTx.SR register contents
  *******************************************************************************/
  u16 UART_9BitByteReceive(UART_TypeDef *UARTx, u16 *Data, u8 TimeOut)
  {
    u16 wStatus = 0;
  
  /* reload the Timeout counter */
    UARTx->TOR=TimeOut;
  
  /* while the UART_RxFIFO is empty and no Timeoutidle */
    while (!((wStatus=UARTx->SR) & (UART_TimeOutIdle|UART_RxHalfFull|UART_RxBufFull)));
   
  /* then read the RxBUFR*/
    *Data = (u16)UARTx->RxBUFR; 
    return wStatus;
  }
  
  /*******************************************************************************
  * Function Name  : UART_DataReceive
  * Description    : This function gets 8 bits data bytes from the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the buffer where the data will be stored
  * Input 3        : The data length
  * Input 4        : The time-out period value
  * Output         : The received 8-bit data buffer
  * Return         : The UARTx.SR register contents
  *******************************************************************************/
  u16 UART_DataReceive(UART_TypeDef *UARTx, u8 *Data, u8 DataLength, u8 TimeOut)
  {
     u16 wStatus = 0;
    while(DataLength--)
      wStatus=UART_ByteReceive(UARTx,Data++,TimeOut);
    return wStatus;
  }
  
  /*******************************************************************************
  * Function Name  : UART_9BitDataReceive
  * Description    : This function gets several 9-bits data from the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the buffer where the data will be stored
  * Input 3        : The data length
  * Input 4        : The time-out value
  * Output         : The received 9-bit data buffer
  * Return         : The UARTx.SR register contents
  *******************************************************************************/
  u16 UART_9BitDataReceive(UART_TypeDef *UARTx, u16 *Data, u8 DataLength, u8 TimeOut)
  { 
   u16 wStatus = 0;
    
    while(DataLength--)
      wStatus=UART_9BitByteReceive(UARTx,Data++,TimeOut);
    return wStatus;
  }
  
  /*******************************************************************************
  * Function Name  : UART_StringReceive
  * Description    : This function gets 8-bit data bytes from the selected UART.
  * Input 1        : UARTx (x can be 0,1, 2 or 3) the selected UART
  * Input 2        : A pointer on the buffer where the string will be stored
  * Output         : The received string
  * Return         : The UARTx.SR register contents
  *******************************************************************************/
  u16 UART_StringReceive(UART_TypeDef *UARTx, u8 *Data)
  {
    u8 *pSTRING=Data;
    u16 wStatus = 0;
  
    do
    {
   /* while the UART_RxFIFO is empty  */
      while (!((wStatus=UARTx->SR) & (UART_RxHalfFull|UART_RxBufFull)));
  
   /* then read the RxBUFR */
      *(pSTRING++) = (u8)UARTx->RxBUFR;
  
    } while((*(pSTRING - 1)!=0x0D)&(*(pSTRING - 1)!='\0'));
  
    *(pSTRING - 1)='\0';
  
    return wStatus;
  }
  
  #ifdef USE_SERIAL_PORT
  /*******************************************************************************
  * Function Name  : sendchar
  * Description    : This function sends a character to the selected UART.
  * Input 1        : A pointer on the character to send.
  * Output         : None
  * Return         : None
  *******************************************************************************/
  void sendchar( char *ch )
  {
     #ifdef USE_UART0
       #define  UARTx  UART0
     #endif /* Use_UART0 */
  
     #ifdef USE_UART1
       #define  UARTx  UART1
     #endif /* Use_UART1 */
  
     #ifdef USE_UART2
       #define  UARTx  UART2
     #endif /* Use_UART2 */
  
     #ifdef USE_UART3
       #define  UARTx  UART3
     #endif /* Use_UART3 */
  
     UART_ByteSend(UARTx,(u8 *)ch);
  }
  #endif /* USE_SERIAL_PORT */
  
  /******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/
  