Subversion Repositories openrisc_2011-10-31

/******************** (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:

*  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"

extern u16 UART_FlagStatus(UART_TypeDef *UARTx);

/*******************************************************************************

* Function Name  : UART_Init

* Description    : This function initializes the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Output         : None

* Return         : None

*******************************************************************************/

void UART_Init(UART_TypeDef *UARTx)

{

  UARTx->IER = 0x00;

  UARTx->CR = 0x00;

  (void)UARTx->RxBUFR;

  UARTx->RxRSTR = 0xFFFF;

  UARTx->TxRSTR = 0xFFFF;

}

/*******************************************************************************

* 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 desired UART

* Input 2        : 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 desired UART

* Input 2        : The baudrate value

* Input 3        : The parity type

* Input 4        : The number of stop bits

* Input 5        : The UART mode

* 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 the interrupts of the

*                  selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Input 2        : The new interrupt flag

* Input 3        : ENABLE or DISABLE

* Output         : None

* Return         : None

*******************************************************************************/

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 desired 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 desired 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 desired 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 desired 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 desired 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 desired UART

* Input 2        : A pointer to the data byte to send

* Output         : None

* Return         : None

*******************************************************************************/

void UART_ByteSend(UART_TypeDef *UARTx, u8 *Data)

{

  if (UARTx->CR & (0x0001<<UART_FIFOEnableBit))// if FIFO ENABLED

    while((UARTx->SR & UART_TxFull)); // while the UART_TxFIFO contain 16 characters.

  else                  // if FIFO DISABLED

    while (!(UARTx->SR & UART_TxEmpty)); // while the transmit shift register not empty

  UARTx->TxBUFR = *Data;

}

/*******************************************************************************

* Function Name  : UART_9BitByteSend

* Description    : This function sends a 9 bits data byte to the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Input 2        : A pointer to the data to send

* Output         : None

* Return         : None

*******************************************************************************/

void UART_9BitByteSend(UART_TypeDef *UARTx, u16 *Data)

{

  if(UARTx->CR & (0x0001<<UART_FIFOEnableBit))// if FIFO ENABLED

    while((UARTx->SR & UART_TxFull)); // while the UART_TxFIFO contain 16 characters.

  else                  // if FIFO DISABLED

    while (!(UARTx->SR & UART_TxEmpty)); // while the transmit shift register not empty

  UARTx->TxBUFR = *Data;

}

/*******************************************************************************

* 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 desired UART

* Input 2        : A pointer to 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 bits data bytes to the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired 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 desired UART

* Input 2        : A pointer to 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 desired UART

* Input 2        : A pointer to the buffer where the data will be stored

* Input 3        : The time-out period

* Output         : The received data

* Return         : The UARTx.SR register contents

*******************************************************************************/

u16 UART_ByteReceive(UART_TypeDef *UARTx, u8 *Data, u8 TimeOut)

{

   u16 wStatus;

   UARTx->TOR=TimeOut;// reload the Timeout counter

   while (!((wStatus=UARTx->SR) & (UART_TimeOutIdle|UART_RxHalfFull|UART_RxBufFull)));// while the UART_RxFIFO is empty and no Timeoutidle

   *Data = (u8)UARTx->RxBUFR; // then read the Receive Buffer Register

   return wStatus;

}

/*******************************************************************************

* Function Name  : UART_9BitByteReceive

* Description    : This function gets a 9 bits data byte from the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Input 2        : A pointer to the buffer where the data will be stored

* Input 3        : The time-out period value

* Output         : The received data

* Return         : The UARTx.SR register contents

*******************************************************************************/

u16 UART_9BitByteReceive(UART_TypeDef *UARTx, u16 *Data, u8 TimeOut)

{

  u16 wStatus;

  UARTx->TOR=TimeOut;// reload the Timeout counter

  while (!((wStatus=UARTx->SR) & (UART_TimeOutIdle|UART_RxHalfFull|UART_RxBufFull)));// while the UART_RxFIFO is empty and no Timeoutidle

  *Data = (u16)UARTx->RxBUFR; // then read the 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 desired UART

* Input 2        : A pointer to the buffer where the data will be stored

* Input 3        : The data length

* Input 4        : The time-out period value

* Output         : The received data

* Return         : The UARTx.SR register contents

*******************************************************************************/

u16 UART_DataReceive(UART_TypeDef *UARTx, u8 *Data, u8 DataLength, u8 TimeOut)

{

  u16 wStatus;

  while(DataLength--)

    wStatus=UART_ByteReceive(UARTx,Data++,TimeOut);

  return wStatus;

}

/*******************************************************************************

* Function Name  : UART_9BitDataReceive

* Description    : This function gets 9 bits data bytes from the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Input 2        : A pointer to the buffer where the data will be stored

* Input 3        : The data length

* Input 4        : The time-out value

* Output         : The received data

* Return         : The UARTx.SR register contents

*******************************************************************************/

u16 UART_9BitDataReceive(UART_TypeDef *UARTx, u16 *Data, u8 DataLength, u8 TimeOut)

{

  u16 wStatus;

  while(DataLength--)

    wStatus=UART_9BitByteReceive(UARTx,Data++,TimeOut);

  return wStatus;

}

/*******************************************************************************

* Function Name  : UART_StringReceive

* Description    : This function gets 8 bits data bytes from the selected UART.

* Input 1        : UARTx (x can be 0,1, 2 or 3) the desired UART

* Input 2        : A pointer to 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;

  do

  {

    while (!((wStatus=UARTx->SR) & (UART_RxHalfFull|UART_RxBufFull)));// while the UART_RxFIFO is empty and no Timeoutidle

    *(pSTRING++) = (u8)UARTx->RxBUFR; // then read the 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 to 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****/