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XS128串口收发程序

热3已有 2539 次阅读 2010-01-07 18:06 标签: 收发程序

#include <hidef.h> /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */

uchar data[] = "flyreally";
uchar result = 0;

/*串口初始化*/
void SCI_Init(void)
{
    SCI0BD = 52;          //波特率9600bps
    SCI0CR1 = 0;          //正常8位模式，无奇偶效验
    SCI0CR2 = 0x2C;       //接收中断允许
}

/*串口发送函数*/
void SCI_TXD(uchar data)
{
    byte tmp;

    while (!(SCI0SR1 & 0x80));       //等待清空缓冲区

    SCI0DRH = 0x00;                 //发送一个字节，高位置零
    SCI0DRL = data;                 //发送数据

    tmp = SCI0SR1;                  //清除标志
}

/*串口接收函数*/
char SCI_RXD(void)
{
    uchar ch;

    while (!(SCI0SR1 & 0x20));       //等待接收数据完毕

    SCI0SR1_RDRF = 1;

    ch = SCI0DRL;

    return ch;
}

/*接收触发中断*/
interrupt 20 void SCI0_ISR(void)
{
    byte tmp;
    DisableInterrupts;
    tmp = SCI0SR1;                   //清除标志

    result = SCI_RXD();
    SCI_TXD(result);
    EnableInterrupts;
}

void main(void)
{
    DisableInterrupts;
    SCI_Init();
    EnableInterrupts;

    DDRB = 0xFF;
    PORTB = 0x00;

while (1);
}

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