/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ----------------------------------------------------------------------------
 */

//------------------------------------------------------------------------------
//      Headers
//------------------------------------------------------------------------------

#include "dbgu.h"
//#include <stdarg.h>
#include <board.h>
            
//*-----------------------------------------------------------------------------
//*                     Exported functions
//*-----------------------------------------------------------------------------
//*-----------------------------------------------------------------------------
//* 函數(shù)名稱(chēng):  DBGU_Configure
//* 函數(shù)功能:  配制調(diào)試串口
//* 入口參數(shù):  1. mode      : 串口模式
//*            2. baudrate  : 波特率
//*            3. mck       : 系統(tǒng)主頻
//* 返回值　:  無(wú)
//*-----------------------------------------------------------------------------
void DBGU_Configure(unsigned int mode,
                    unsigned int baudrate,
                    unsigned int mck)
{   
    //* Reset & disable receiver and transmitter, disable interrupts
    //* 復(fù)位并禁止調(diào)試串口接收與發(fā)送，禁止中斷
    AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
    AT91C_BASE_DBGU->DBGU_IDR = 0xFFFFFFFF;
    
    //* Configure baud rate
    //* 配制串口波特率
    AT91C_BASE_DBGU->DBGU_BRGR = mck / (baudrate * 16);
    
    //* Configure mode register
    //* 配制串口模式
    AT91C_BASE_DBGU->DBGU_MR = mode;
    
    //* Disable DMA channel
    //* 禁止 DMA
    AT91C_BASE_DBGU->DBGU_PTCR = AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS;

    //* Enable receiver and transmitter
    //* 使能串口接收與發(fā)送
    AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RXEN | AT91C_US_TXEN;
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_US_TxReady
//* \brief Return 1 if a character can be written in US_THR
//*----------------------------------------------------------------------------
unsigned int AT91F_US_TxReady (AT91PS_USART pUSART)     // \arg pointer to a USART controller
{
    return (pUSART->US_CSR & AT91C_US_TXRDY);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_US_PutChar
//* \brief Send a character,does not check if ready to send
//*----------------------------------------------------------------------------
void AT91F_US_PutChar (AT91PS_USART pUSART, int character )
{
    pUSART->US_THR = (character & 0x1FF);
}


//**********************************************************************
//*函數(shù)名稱(chēng) : DBGU_Printk
//*函數(shù)功能 : 向串口輸出字符串
//*入口參數(shù) : *buffer: 要輸出的字符串起始地址     
//*返回值   : 無(wú)    
//**********************************************************************
void DBGU_Printk(char *buffer) 		// \arg pointer to a string ending by \0
{
    while(*buffer != '\0') 
    {
        while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
        AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, *buffer++);
    }
}


//*-----------------------------------------------------------------------------
//* 函數(shù)名稱(chēng):  DBGU_PutChar
//* 函數(shù)功能:  從串口輸出一個(gè)字符
//* 入口參數(shù):  c: 待輸出的字符
//* 返回值　:  無(wú)
//*-----------------------------------------------------------------------------
static void DBGU_PutChar(unsigned char c)
{
    //* Wait for the transmitter to be ready
    //* 等待發(fā)送緩存器空
    while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0);
    
    //* Send character
    //* 發(fā)送字符
    AT91C_BASE_DBGU->DBGU_THR = c;
    
    //* Wait for the transfer to complete
    //* 等待發(fā)送完成
    while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0);
}


//*-----------------------------------------------------------------------------
//* 函數(shù)名稱(chēng):  DBGU_GetChar
//* 函數(shù)功能:  從串獲取一個(gè)字符
//* 入口參數(shù):  無(wú)
//* 返回值　:  獲取的字符
//*-----------------------------------------------------------------------------
unsigned char DBGU_GetChar()
{
    while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY) == 0);
    return AT91C_BASE_DBGU->DBGU_RHR;
}


#ifndef NOFPUT

#include <stdio.h>

//------------------------------------------------------------------------------
/// Implementation of fputc using the DBGU as the standard output. Required
/// for printf().
/// Returns the character written if successful, or -1 if the output stream is
/// not stdout or stderr.
/// \param c  Character to write.
/// \param pStream  Output stream.
//------------------------------------------------------------------------------
signed int fputc(signed int c, FILE *pStream)
{
    if ((pStream == stdout) || (pStream == stderr)) 
    {
        DBGU_PutChar(c);
        return c;
    }
    else 
        return EOF;
}


//------------------------------------------------------------------------------
/// Implementation of fputs using the DBGU as the standard output. Required
/// for printf(). Does NOT currently use the PDC.
/// Returns the number of characters written if successful, or -1 if the output
/// stream is not stdout or stderr.
/// \param pStr  String to write.
/// \param pStream  Output stream.
//------------------------------------------------------------------------------
signed int fputs(const char *pStr, FILE *pStream)
{
    signed int num = 0;

    while (*pStr != 0) 
    {
        if (fputc(*pStr, pStream) == -1) 
            return -1;
        num++;
        pStr++;
    }

    return num;
}

#undef putchar

//------------------------------------------------------------------------------
/// Outputs a character on the DBGU. Returns the character itself.
/// \param c  Character to output.
//------------------------------------------------------------------------------
signed int putchar(signed int c)
{
    return fputc(c, stdout);
}

#endif //#ifndef NOFPUT