單片機(jī)RS-485通信源程序.doc

附錄一、主機(jī)源程序#include unsigned char xdata table5;unsigned char code tab=0x03,0x9f,0x25,0x0d, 0x99,0x49,0x41,0x1f, 0x01,0x09,0x05,0xc1, 0x63,0x85,0x61,0x71,0xff;sbit ctrl=P12;sbit DATA=P10;sbit CLK=P11;void show(unsigned char m)/LED顯示子程序unsigned char i,d;d=tabm;for(i=0;i1; void interrupt0(void) interrupt 0 using 0/串行中斷程序 unsigned char cm0,cm1,sum0,sum1,i; lab: sum0=0; ctrl=1;/將MAX485設(shè)置為發(fā)送方式 SBUF=0xFF;/發(fā)送數(shù)據(jù)申請(qǐng) while(TI!=1); ctrl=0; /將MAX485設(shè)置為接收方式 TI=0; while(RI!=1); cm0=SBUF;/接收申請(qǐng)確認(rèn)信號(hào) RI=0; if(cm0=0xff) i=0; ctrl=0; while(RI!=1); cm1=SBUF; /接收第一個(gè)數(shù)據(jù) RI=0; while(cm1!=0xf0) tablei=cm1; while(RI!=1); cm1=SBUF;/接收后續(xù)的數(shù)據(jù) RI=0; i+; for(i=0;i4;i+) sum0=sum0+tablei;/計(jì)算校驗(yàn)和 sum1=table4;/獲取收到的校驗(yàn)和 if(sum0=sum1) ctrl=1; SBUF=0xf0; /發(fā)送數(shù)據(jù)確認(rèn)信號(hào) while(TI!=1); TI=0; for(i=0;i4;i+) show(tablei); else goto lab; else goto lab; ctrl=1;/將MAX485設(shè)置為發(fā)送方式 return ;void main(void) SCON = 0x50; /串口方式1,允許接收 TMOD = 0x20; /定時(shí)器1 定時(shí)方式2 PCON=0x80; /設(shè)SMOD=1； TH1 = 0xFA; /11.0592MHz 9600 波特率 TL1 = 0xFA; TR1 = 1; /啟動(dòng)定時(shí)器 EX0=1; /開外部中斷0 IT0=0; EA=1; /開總中斷 ctrl=1;/將MAX485設(shè)置為發(fā)送方式 while(1); /等待中斷附錄二、從機(jī)源程序#include unsigned char xdata table=0,0,0,0;sbit replay=P10;sbit warn0=P11;sbit CTRL=P12;sbit DATA=P13;sbit CLK=P14;unsigned char code tab=0x03,0x9f,0x25,0x0d, /顯示用的碼表 0x99,0x49,0x41,0x1f, 0x01,0x09,0x05,0xc1, 0x63,0x85,0x61,0x71,0xff;void delay(void) /鍵盤掃描延時(shí)10ms程序 unsigned char i,j; for(i=20;i0;i-) for(j=248;j0;j-);void show(unsigned char m)/LED顯示子程序 unsigned char i,d; d=tabm; for(i=0;i1; void ser(void) interrupt 4 using 0/串行中斷程序 unsigned char cm,sum,i; sum=0; replay=1; warn0=1; cm=SBUF; RI=0;if(cm=0xf0)/判斷是否為主機(jī)返回的確認(rèn)信號(hào) replay=0; /表示已正確發(fā)送完一組數(shù)據(jù) goto end; else if(cm!=0xff)/判斷是否為主機(jī)的數(shù)據(jù)申請(qǐng) warn0=0; /通信命令錯(cuò)誤提示 goto end;else CTRL=1; /置MAX485為發(fā)送方式 SBUF=0xff;/發(fā)送申請(qǐng)確認(rèn)信號(hào) while(TI!=1); TI=0;for(i=0;i4;i+) SBUF=tablei; /發(fā)送數(shù)據(jù) while(TI!=1); TI=0; sum=sum+tablei;/計(jì)算校驗(yàn)和 SBUF=sum; /發(fā)送校驗(yàn)和while(TI!=1);TI=0;SBUF=0xf0;/發(fā)送結(jié)束標(biāo)志while(TI!=1);TI=0; end: CTRL=0; /置MAX485為接收方式 return;void main(void) unsigned char key,X,Y,temp; SCON = 0x50; /串口方式1,允許接收 TMOD = 0x20; /定時(shí)器1 定時(shí)方式2 PCON=0x80; /設(shè)SMOD=1； TH1 = 0xFA; /11.0592MHz 9600 波特率 TL1 = 0xFA; TR1 = 1; /啟動(dòng)定時(shí)器 ES=1; /開串行中斷 EA=1; /開總中斷 CTRL=0; /置MAX485為接收方式 replay=1; warn0=1; while(1) /鍵盤掃描 P2=0xff; /鍵盤初始化 P2=0xf0; if (P2!=0xf0) delay(); /延時(shí)去抖 if (P2!=0xf0) X=P2; /讀鍵盤P2=0x0f;Y=P2; P2=X|Y; temp=P2;switch(temp) case 0xee:key=0;break; case 0xde:key=1;break; case 0xbe:key=2;break; case 0x7e:key=3;break; case 0xed:key=4;break; case 0xdd:key=5;break; case 0xbd:key=6;break; case 0x7d:key=7;break; case 0xeb:key=8;break; case 0xdb:key=9;break; case 0xbb:key=10;break; case 0x7b:key=11;break; case 0xe7:key=12;break; case 0xd7:key=13;break; case 0xb7:key=14;break; case 0x77:key=15;break; for(X=0;X4;X+) /存儲(chǔ)最近讀的按鍵碼 tab