S3C2440——使用URAT0查询方式发送和接收字符串

UART初始化函数

void Uart_Init(int pclk,int baud)

{

    int i;

    rGPHCON|=0xa0; //GPH2,GPH3 as TXD0,RXD0

    rGPHUP = 0x0;    //GPH2,GPH3内部上拉

    if(pclk == 0)

    pclk = PCLK;

    rUFCON0 = 0x0; //禁止3个通道的FIFO控制寄存器

    rUFCON1 = 0x0;

    rUFCON2 = 0x0;

    rUMCON0 = 0x0;

    rUMCON1 = 0x0;

    rUMCON2 = 0x0;    //初始化3个通道的MODEM控制寄存器，禁止AFC

    //Line control register 0: Normal,No parity,1 stop,8 bits.

    rULCON0=0x3;

    // Control register 0

    rUCON0  = 0x5;

    //Baud rate divisior register 0

    rUBRDIV0=( (int)(pclk/16./baud+0.5) -1 );

}

接收1字节数据

//接收一字节数据

char Uart_Getch(void)

{

    while(!(rUTRSTAT0 & 0x1)); //等待就绪

    //读错误状态寄存器UERSTATn

    if ((rUERSTAT0 & 0x1)|| (rUERSTAT0 & 0x4))

        return -1;

    return RdURXH0;  //0x50000027

}

接收1个字符串

//接收一个字符串

void Uart_GetString(char *string)

{

    char *string2 = string;

    char c;

    while((c = Uart_Getch())!=‘r’)   //回车符

        *string++ = c;

}

接收1个字符串，转换为数字

int Uart_GetIntNum(void)

{

    char str[30];

    char *string = str;

    int base     = 10;  //进制

    int minus    = 0;   //是否负数

    int result   = 0;    //转换的结果

    int lastIndex;       //字符串长度

    int i;

    Uart_GetString(string);

    if(string[0]=='-')

    {

        minus = 1;

        string++;

    }

    if(string[0]=='0' && (string[1]=='x' || string[1]=='X'))

    {

        base    = 16;

        string += 2;

    }

    lastIndex = strlen(string) - 1;

    if(lastIndex<0)

            return -1;

    if(string[lastIndex]=='h' || string[lastIndex]=='H' )

    {

        base = 16;

        string[lastIndex] = 0;

        lastIndex--;

    }

    if(base==10)

    {

        result = atoi(string);

        result = minus ? (-1*result):result;

    }

    else {

        for(i=0;i<=lastIndex;i++) {

            if(isalpha(string[i]))

            {

                if(isupper(string[i]))

                    result = (result<<4) + string[i] - ‘A’ + 10;//之前的结果乘16，再加当前数字

                else

                    result = (result<<4) + string[i] - 'a' + 10;

            }

            else

            {

                result = (result<<4) + string[i] - '0';

            }

            result = minus ? (-1*result):result;

    }

    return result;

}

发送一字节

//发送一字节

//#define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000023)=(unsigned char)(ch)

void Uart_SendByte(int data)

{

    while(!(rUTRSTAT0 & 0x4));

    Delay(10);  //because the slow response of hyper_terminal

    WrUTXH0(data);

}

送一个字符串

//发送一个字符串

void Uart_SendString(char *pt)

{

    while(*pt)

        Uart_SendByte(*pt++);

}

2410addr.h 定义UART各个寄存器的头文件

//2410addr.h  定义UART各个寄存器的头文件

#define rULCON0 ( * (volatile unsigned * )0x50000000)  //UART 0 Line control

#define rUCON0 ( * (volatile unsigned * )0x50000004)  //UART 0 control

#define rUFCON0 ( * (volatile unsigned * )0x50000008)  //UART 0 FIFO control

#define rUMCON0 ( * (volatile unsigned * )0x5000000c)  //UART 0 Modem control

#define rUTRSTAT0 ( * (volatile unsigned * )0x50000010)  //UART 0 Tx/Rx status

#define rUERSTAT0 ( * (volatile unsigned * )0x50000014)  //UART 0 Rx error status

#define rUFSTAT0 ( * (volatile unsigned * )0x50000018)  //UART 0 FIFO status

#define rUMSTAT0 ( * (volatile unsigned * )0x5000001c)  //UART 0 Modem status

#define rUBRDIV0 ( * (volatile unsigned * )0x50000028)  //UART 0 Baud rate diviaor

#define rULCON1 ( * (volatile unsigned * )0x50004000)  //UART 1 Line control

#define rUCON1 ( * (volatile unsigned * )0x50004004)  //UART 1 Control

#define rUFCON1 ( * (volatile unsigned * )0x50004008)  //UART 1 FIFO control

#define rUMCON1 ( * (volatile unsigned * )0x5000400c)  //UART 1 Modem control

#define rUTRSTAT1  ( * (volatile unsigned * )0x50004010)  //UART 1 Tx/Rx status

#define rUERSTAT1  ( * (volatile unsigned * )0x50004014)  //UART 1 Rx error status

#define rUFSTAT1 ( * (volatile unsigned * )0x50004018)  //UART 1 FIFO status

#define rUMSTAT1  ( * (volatile unsigned * )0x5000401c)  //UART 1 Modem status

#define rUBRDIV1  ( * (volatile unsigned * )0x50004028)  //UART 1 Baud rate divisor

#define rULCON2  ( * (volatile unsigned * )0x50008000)  //UART 2 Line control

#define rUCON2 ( * (volatile unsigned * )0x50008004)  //UART 2 Control

#define rUFCON2 ( * (volatile unsigned * )0x50008008)  //UART 2 FIFO control

#define rUMCON2 ( * (volatile unsigned * )0x5000800c)   //UART 2 Modem control

#define rUTRSTAT2  ( * (volatile unsigned * )0x50008010)  //UART 2 Tx/Rx status

#define rUERSTAT2  ( * (volatile unsigned * )0x50008014)  //UART 2 Rx error status

#define rUFSTAT2 ( * (volatile unsigned * )0x50008018)  //UART 2 FIFO status

#define rUMSTAT2  ( * (volatile unsigned * )0x5000801c)  //UART 2 Modem status

#define rUBRDIV2  ( * (volatile unsigned * )0x50008028)  //UART 2 Baud rate divisor

#if def_BIG_ENDIAN

#define rUTXH0  ( * (volatile unsigned char * )0x50000023)  //UART 0 Transmission Hold

#define rURXH0  ( * (volatile unsigned char * )0x50000027)  //UART 0 Receive buffer

#define rUTXH1  ( * (volatile unsigned char * )0x50004023)  //UART 1 Transmission Hold

#define rURXH1  ( * (volatile unsigned char * )0x50004027)  //UART 1 Receive buffer

#define rUTXH2  ( * (volatile unsigned char * )0x50008023)  //UART 2 Transmission Hold

#define rURXH2  ( * (volatile unsigned char * )0x50008027)  //UART 2 Receive buffer

#define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000023)=(unsigned char)(ch)

#define RdURXH0  ( * (volatile unsigned char * )0x50000027)

#define WrUTXH1(ch)  ( * (volatile unsigned char * )0x50004023)=(unsigned char)(ch)

#define RdURXH1()  ( * (volatile unsigned char * )0x50004027)

#define WrUTXH20(ch)  ( * (volatile unsigned char * )0x50008023)=(unsigned char)(ch)

#define RdURXH2()  ( * (volatile unsigned char * )0x50008027)

#define UTXH0     (0x50000020+3)  //Byte_access address by DMA

#define URXH0     (0x50000024+3)

#define UTXH1     (0x50004020+3)

#define URXH1     (0x50004024+3)

#define UTXH2     (0x50008020+3 )

#define URXH2     (0x50008024+3)

#else//Little Endian

#define rUTXH0  ( * (volatile unsigned char * )0x50000020)//UART 0 Transmission Hold

#define rURXH0  ( * (volatile unsigned char * )0x50000024)//UART 0 Receive buffer

#define rUTXH1  ( * (volatile unsigned char * )0x50004020)//UART 1 Transmission Hold

#define rURXH1  ( * (volatile unsigned char * )0x50004024)//UART 1 Receive buffer

#define rUTXH2  ( * (volatile unsigned char * )0x50000820)//UART 2 Transmission Hold

#define rURXH2  ( * (volatile unsigned char * )0x50008024)//UART 2 Receive buffer

#define WrUTXH0(ch)  ( * (volatile unsigned char * )0x50000020)=(unsigned char)(ch)

#define RdURXH0  ( * (volatile unsigned char * )0x50000024)

#define WrUTXH1(ch)  ( * (volatile unsigned char * )0x50004020)=(unsigned char)(ch)

#define RdURXH1()  ( * (volatile unsigned char * )0x50004024)

#define WrUTXH2(ch)  ( * (volatile unsigned char * )0x50008020)=(unsigned char)(ch)

#define RdURXH2()  ( * (volatile unsigned char * )0x50008024)

#define UTXH0     (0x50000020+3)  //Byte_access address by DMA

#define URXH0     (0x50000024+3)

#define UTXH1     (0x50004020+3)

#define URXH1     (0x50004024+3)

#define UTXH2     (0x50008020+3 )

#define URXH2     (0x50008024+3)

#endif