UAV2101~2105串行通信训练

#include <reg52.h>

bit busy;

void SendData(unsigned char dat)
{
    while(busy);//判断是否忙
    busy =1;
    SBUF = dat;

}
void SendString(char *s)
{
    while (*s)    //Check the end of the string
    {
        SendData(*s++); //Send current char and increment string ptr
    }
}
void main()
{
    SCON = 0x40;  //配置工作方式1，禁止接收
    PCON |= 0x80; //SMOD=1，波特率加倍
    TMOD = 0x20;  //T1工作于方式2，定时方式
    TH1 = 0xfa;   //定时器装初值
    TL1 = 0xfa;
    TR1 = 1; //开定时器1
    ES = 1;  //开串口中断
    EA = 1;  //开总中断
    SendString("STC89C52RC\r\nUart Test !\r\n");
    while(1);
}

void uart() interrupt 4
{
    if(TI)
    {
        TI = 0;
        busy = 0;        
    }
}

#include <reg52.h>

unsigned char Tab[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,
0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E}; //共阳极8段

//#define FOSC 11059200L      //System frequency
//#define BAUD 9600           //UART baudrate
//TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule
char uart_data;

void main (void)
{
    SCON = 0x50; /* uart in mode 1 (8 bit), REN=1 */
    TMOD = TMOD | 0x20 ; /* Timer 1 in mode 2 */
    TH1 = 0xFD; /* 9600 Bds at 11.059MHz */
    TL1 = 0xFD; /* 9600 Bds at 11.059MHz */
    ES = 1; /* Enable serial interrupt*/
    EA = 1; /* Enable global interrupt */
    TR1 = 1; /* Timer 1 run */
    while(1); /* endless */
}

void serial_IT(void) interrupt 4
{
    if (RI == 1)
    {    /* if reception occur */
         RI = 0; /* clear reception flag for next reception */
         uart_data = SBUF; /* Read receive data */
         P2 = Tab[uart_data];
         SBUF = uart_data; /* Send back same data on uart*/
    }
    else TI = 0; /* if emission occur */
} /* clear emission flag for next emission*/

#include <reg52.h>
unsigned char Tab[]={'1','2','3','4','5','o','k'};//定义了向PC机发送的数组
unsigned char i;
void main()
{
    SCON = 0x40;  //配置工作方式1，禁止接收
    PCON |= 0x80; //SMOD=1，波特率加倍
    TMOD = 0x20;  //T1工作于方式2，定时方式
    TH1 = 0xfa;   //定时器装初值
    TL1 = 0xfa;
    TR1 = 1; //开定时器1

    while(1)
    {
        for(i=0;i<7;i++)
        {
            SBUF = Tab[i];
            while(!TI);//等待发送完
            TI=0;      //清除发送结束标志  
        }
        SBUF= '\r' ;   //回车
        while(!TI);    //等待发送完
        TI=0;          //清除发送结束标志 
//        SBUF= '\n' ;   //换行
//        while(!TI);  //等待发送完
//        TI=0;          //清除发送结束标志          
    }        
}