兩單片機通訊

1、 兩個單片機之間的通訊矩陣鍵盤4*4 P1位矩陣鍵盤接的端口，接收端和發(fā)射端數(shù)碼管對比顯示 發(fā)射程序#include<reg52.h>#define uchar unsigned char#define uint unsigned intunsigned char const SMG=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71;/0-Fvoid delay(uint i) /延時函數(shù)while(i-);void send(uchar key_num) SBUF=ke

2、y_num; while(TI) TI=0;void keyscan() /鍵盤掃描函數(shù)，使用行列反轉(zhuǎn)掃描法 uchar key,num; uchar hen,lie ; /行列值中間變量 P1=0x0f; /行線輸出全為0 hen=P1&0x0f; /讀入列線值 if(hen!=0x0f) /先檢測有無按鍵按下 delay(100); /去抖 if(hen!=0x0f) hen=P1&0x0f; /讀入列線值 P1=hen|0xf0; /輸出當前列線值 lie=P1&0xf0; /讀入行線值 num=hen+lie; /鍵盤最后組合碼值switch(num) case

3、 0x7e:key=0; P0=SMG0; break;/0 按下相應的鍵顯示相對應的碼值 case 0x7d:key=1; P0=SMG1; break;/1 case 0x7b:key=2; P0=SMG2; break;/2 case 0x77:key=3; P0=SMG3; break;/3 case 0xbe:key=4; P0=SMG4; break;/4 case 0xbd:key=5; P0=SMG5; break;/5 case 0xbb:key=6; P0=SMG6; break;/6 case 0xb7:key=7; P0=SMG7; break;/7 case 0xde

4、:key=8; P0=SMG8; break;/8 case 0xdd:key=9; P0=SMG9; break;/9 case 0xdb:key=10; P0=SMG10; break;/a case 0xd7:key=11; P0=SMG11; break;/b case 0xee:key=12; P0=SMG12; break;/c case 0xed:key=13; P0=SMG13; break;/d case 0xeb:key=14; P0=SMG14; break;/e case 0xe7:key=15; P0=SMG15; break;/f send(key); void m

5、ain() TMOD =0x20; TH1=0xf3; TL1=0xf3; TR1=1; SM0=0; SM1=1; EA=1; ES=1; while(1) keyscan(); 接收程序#include<reg52.h>#define uchar unsigned char#define uint unsigned intuchar code tab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;uchar LIU=0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfe;/流水燈的顯示void display(uchar num) P2=0x00; P0=tabnum;void main() TMOD =0x20; TH1=0xf3; TL1=0xf3; TR1=1; REN=1; / REN用于控制數(shù)據(jù)接收的允許和禁止 SM0=0; SM1=1;/串口工作方式1 E