基于單片機(jī)通過(guò)串口與電腦連接通信

本實(shí)驗(yàn)實(shí)現(xiàn)串口中斷實(shí)驗(yàn)，通過(guò)中斷和計(jì)算機(jī)進(jìn)行通信????????? ???*
?首先接受聯(lián)機(jī)信號(hào)，然后接受計(jì)算機(jī)的相關(guān)控制信號(hào)??????????? *
?本實(shí)驗(yàn)中，采用發(fā)送不同的字符給計(jì)算機(jī)來(lái)模擬接收到的不同的計(jì)算機(jī)控制命令????? *
?通過(guò)擴(kuò)展，可以實(shí)現(xiàn)不同的功能 ??????????????? *
?????????????????????????????????? ?????*??????????????????????????????????????? ?*
?????????? ??????????????????????? ??????????*
?????????????????????????????? *??????????????????????????????????????????? ?*
********************************************************************************/
?

#include
#define uchar? unsigned char

uchar time,b_break,b_break_3;
uchar buf;

void waitsend()
{
???? while(!TI)
???? {
???? };
???? TI = 0;
}
//串行中斷程序
void int_s(void) interrupt 4 {
?ES = 0;??? //關(guān)閉串行中斷
?RI = 0;??? //清除串行接受標(biāo)志位
?buf = SBUF;? //從串口緩沖區(qū)取得數(shù)據(jù)
?P1 = buf;??? //數(shù)據(jù)送往p1口顯示出來(lái)
?if(buf == 255) SBUF = 255; //發(fā)送聯(lián)絡(luò)信號(hào)
?else{
???? switch(buf)
???? {
???????? case 1: SBUF = 'M',waitsend();break;?? //如果接受到1，發(fā)送字符'M'給計(jì)算機(jī)
???????? case 2: SBUF = 'C',waitsend();break;?? //如果接受到2，發(fā)送字符'C'給計(jì)算機(jī)
???????? case 3: SBUF = 'S',waitsend();break;?? //如果接受到3，發(fā)送字符'S'給計(jì)算機(jī)
???????? case 4: SBUF = '5',waitsend();break;?? //如果接受到4，發(fā)送字符'5'給計(jì)算機(jī)
???????? case 5: SBUF = '1',waitsend();break;?? //如果接受到5，發(fā)送字符'1'給計(jì)算機(jī)???
???????? ????????????????
???????? default: SBUF = 'n',waitsend();break;? //如果接受到其它數(shù)據(jù)，發(fā)送n給計(jì)算機(jī)
????????
???? }
?}
?ES = 1;??? //允許串口中斷
?
}

void main(void) {

??? P0 = 0;
??? P2 = 255;??? //關(guān)閉數(shù)碼管顯示
???
?EA=1;
?SCON=0x50;PCON=0X80;
?TMOD=0x20;ES = 1;
?TL1=TH1=0xf3;TR1=1;?? //串口工作在模1，波特率4800@12Mhz)
?
??? while(1);
??????????????????? //無(wú)限循環(huán)等待串行中斷
}