单片机与上位机通信系统设计.doc

单片机与上位机通信系统设计
JIU JIANG UNIVERSITY
 
《单片机原理与应用》大作业
 
 
题 目 单片机与上位机通信系统设计
院 系 信息科片机提供复位功能。单片机作为主控制器，根据输入信号对系统进行相应的控制处理。9针接口电路和上位机的接口相连实现上位机和单片机之间的通信。发光二极管是单片机控制的控制对象实际应用中，它连接相应的光电隔离和驱动电路。
五．系统软件设计
程序流程图如图19-3所示，其中初始化主要是对串口工作方式等设置
程序清单：
#include <>
#define uchar unsigned char
#define uint unsigned int
uchar a;
sbit d = P3^7;
//--------------------------------------
say_CR_LF()
{
SBUF = 13; while (TI == 0); TI = 0;
SBUF = 10; while (TI == 0); TI = 0;
}
//--------------------------------------
say_yeah()
{
SBUF = a; while (TI == 0); TI = 0;
SBUF = ','; while (TI == 0); TI = 0;
SBUF = ' '; while (TI == 0); TI = 0;
SBUF = 'y'; while (TI == 0); TI = 0;
SBUF = 'e'; while (TI == 0); TI = 0;
SBUF = 'a'; while (TI == 0); TI = 0;
SBUF = 'h'; while (TI == 0); TI = 0;
SBUF = '!'; while (TI == 0); TI = 0;
say_CR_LF();
}
//--------------------------------------
say_hello()
{
SBUF = 'H'; while (TI == 0); TI = 0;
SBUF = 'e'; while (TI == 0); TI = 0;
SBUF = 'l'; while (TI == 0); TI = 0;
SBUF = 'l'; while (TI == 0); TI = 0;
SBUF = 'o'; while (TI == 0); TI = 0;
SBUF = '!'; while (TI == 0); TI = 0;
say_CR_LF();
}
//--------------------------------------
void init()
{
SCON = 0x50; //设置串口通信方式1, 允许接收
PCON &= 0x7F;
TMOD = 0x20; //设置T1定时方式2
TH1 = 0xfd; //******@
TL1 = 0xfd;
TR1 = 1; //启动T1
ES = 1; //开串口中断.
EA = 1; //开总中断.
say_hello();
}
//--------------------------------------
void delay(uint z)
{
uint x, y;
for(x = z; x > 0; x--) for(y = 110; y > 0; y--);
}
//--------------------------------------
void main()
{
init();
TI = 1;
a = '4';
while(1) {
if(a == '1') {
d = 0; delay(400);
d = 1; delay(400);
}
else if(a == '2') {
d = 0; delay(200);