|
|
- #include <reg52.h>
- #include <intrins.h>
- typedef unsigned char uchar;
- typedef unsigned int uint;
- uchar flag, a;
- uchar code table[]=" I get ";
- //串口初始化
- void Serial_Init()
- {
- TMOD = 0x20; //設(shè)定T1定時(shí)器工作方式2
- TH1 = 0xfd; //T1定時(shí)器裝初值 9600
- TL1 = 0xfd; //T1定時(shí)器裝初值
- TR1 = 1; //啟動(dòng)T1定時(shí)器
- REN = 1; //允許串口接收
- SM0 = 0; //設(shè)定串口工作方式1
- SM1 = 1; //同上
- EA = 1; //開(kāi)總中斷
- ES = 1; //開(kāi)串口中斷
- }
- void main()
- {
- Serial_Init();
- while(1)
- {
- if(flag)
- {
- uchar i;
- ES = 0;//先關(guān)閉串口中斷防止干擾
- for(i=0; i<7; i++)
- {
- SBUF = table[i];
- while(!TI);//即等待發(fā)送完成,因?yàn)榘l(fā)送完成后TI由硬件置位
- TI = 0;//清零以進(jìn)行下一次發(fā)送
- }
- SBUF = a;//串行發(fā)送時(shí)，CPU向SBUF寫(xiě)入數(shù)據(jù)，sbuf的容量很大
- while(!TI);
- TI = 0;
- ES = 1;
- flag=0;
- }
- }
- }
- void ser() interrupt 4 //串口中斷,接收,a相當(dāng)于接收緩存
- {
- RI = 0;//接收完成后RI由硬件置1,中斷里面清零以進(jìn)行下一次接收
- a = SBUF;//串行接收時(shí)，CPU從SBUF讀出數(shù)據(jù)
- flag = 1;
- }
|
|
