uart.c

ST ARM STR7系列在应用编程示例.采用串口下载.可供参考

/******************** (C) COPYRIGHT 2004 STMicroelectronics ********************
* File Name          : uart.c
* Author             : MCD Application Team
* Date First Issued  : 08/06/2003
* Description        : This file provides all the UART software functions
********************************************************************************
* History:
*  08/06/2003 : Created
*  11/24/2004 : IAP Version 1.0
********************************************************************************
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_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->BRR = (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_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 NewStatus)
{
  if (NewStatus==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->RRR=0xFFFF; else UARTx->TRR=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 NewStatus)
{
  if (NewStatus==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 NewStatus)
{
  if (NewStatus==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 NewStatus)
{
  if (NewStatus==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->TBR = *Data;
}


/******************* (C) COPYRIGHT 2004 STMicroelectronics *****END OF FILE****/