uart.c

FreeRTOSV4.1.0 安裝文件 FreeRTOS 是一个源码公开的免费的嵌入式实时操作系统

/******************** (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"

/*******************************************************************************
* 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.