16F877单片机与PC机通讯的源程序

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;*?????? 单片机与PC机通讯的源程序?????? *
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;单片机与PC机通讯的源程序（详细）??

;单片机的程序
LIST????? P=16F876
#INCLUDE??? P16F876.INC
CBLOCK 0X24
COUNT??
TEMP
ENDC
????? ORG?? 0X0000
????? NOP
START?? GOTO?? MAIN
????? ORG????? 0X020
MAIN?? MOVLW?? 0X30??????????? ；将RAM单元初始化
????? MOVWF?? FSR
????? BCF????? STATUS，RP0
????? MOVLW?? 0X22
????? MOVWF?? COUNT
INTRAM?? MOVF?? COUNT，0
????? MOVWF?? INDF
????? INCF????? COUNT，1
????? INCF????? FSR，1
????? BTFSS?? FSR，7
????? GOTO?? INTRAM
????? BANKSEL?? TXSTA???????? ；波特率设置为9 600 bps
????? MOVLW?? 0X19
????? MOVWF?? SPBRG???????? ；异步高速方式
????? MOVLW?? 0X04
????? MOVWF?? TXSTA
????? BCF?? STATUS，RP0
????? MOVLW?? 0X80??????????? ；串行口使能
????? MOVWF?? RCSTA
????? MOVLW?? 0X30
????? MOVWF?? FSR
????? BSF????? RCSTA，CREN????? ；接收允许
????? BSF????? STATUS，RP0
????? BSF????? TXSTA，TXEN????? ；发送允许
????? BCF????? STATUS，RP0
WAIT?? BTFSS?? PIR1，RCIF????? ；接收PC机命令
????? GOTO?? WAIT
????? MOVF?? RCREG，0
????? MOVWF?? TEMP
????? MOVWF?? INDF
????? INCF?? FSR
????? DECFSZ?? TEMP???????? ；接收到的数据为1，则接收
????? GOTO?? TXW??????????? ；否则发送数据
????? MOVLW?? 0X06
????? MOVWF?? TEMP
WAIT1?? BTFSS?? PIR1，RCIF????? ；接收一个数据
????? GOTO?? WAIT1
????? MOVF?? RCREG，0
????? MOVWF?? COUNT
????? MOVWF?? TXREG
LOOPTX?? BTFSS?? PIR1，TXIF????? ；将接收到的数据送回PC机
????? GOTO?? LOOPTX
????? MOVF?? COUNT，0
????? MOVWF?? INDF??
????? INCF????? FSR
????? DECFSZ?? TEMP
????? GOTO?? WAIT1
????? GOTO?? OVER???????? ；处理完毕
TXW????? MOVLW?? 0X09??????????? ；向PC机发送9个数据
????? MOVWF?? TEMP
????? MOVLW?? 0X30
????? MOVWF?? FSR
TXW0?? MOVF?? INDF，0
????? MOVWF?? TXREG
????? INCF????? FSR
TXW1?? BTFSS?? PIR1，TXIF
????? GOTO?? TXW1
????? DECFSZ?? TEMP
????? GOTO?? TXW0??
OVER?? BCF????? RCSTA，CREN????? ；通信任务完成，关接受和发送允许
????? BSF????? STATUS，RP0
????? BCF????? TXSTA，TXEN
????? BCF????? STATUS，RP0
????? CALL?? LED??????????? ；调用显示子程序，将发送（或接收）的数据显示出来
????? END????????????????? ；程序完

P C 机 程 序
PC采用Toubr C 进行编写。程序如下：
#include
#define? port??? 0x3f8?????????????? /*利用串口1进行通信*/
int ch[15];
main ()
{
?int a;
?int i,j;
?int b[6]={88,15,38,26,20,0};
?char c;
?clrscr();
?outportb(port+3,0x80);?????????????? /*准备设置波特率*/
?outportb(port,0x0C);?????????????? /*波特率设置为9 600 bps*/
?outportb(port+1,0x00);
?outportb(port+3,0x03);?????????????? /*8位数据位，奇偶检验，1位停止位*/
?outportb(port+1,0x00);?????????????? /*关中断*/
?inportb(port+5);????????????????? /*读一次线路状态寄存器，使其复位*/
?{
? printf("\t\tsend data or receive data: (s or r?)\n\n\n");
? c=getchar();
?? switch(c)
?? {
?? case 's':
?? case 'S':
?? {
?? while(!(inportb(port+5)&0x20));???????? /*发送保持器满则等待*/
??? outportb(port,0x01);??????????? /*否则发送数据01通知单片机准备接收*/
??? for(i=0;i<6;i++)?????????????? /*共发送6个数据*/
?? {
??? a=b[i];
??? while(!(inportb(port+5)&0x20))
??? delay(100);????????????????? /*发送保持器满，等待*/
??? outportb(port,a);?????????????? /*发送a*/
??? printf("%d\n",a);?????????????? /*显示a*/
??? while(!(inport(port+5)&1));???????? /*接收单片机送回的数据*/
??? ch[i]=inport(port);?????????????? /*保存*/
??? }
??? delay(10);
??? for(j=0;j<8;j++)?????????????? /*显示接收的回送数据*/
??? printf("\n%d\n",ch[j]);
??? getch();
??? break;
??? }
??? case'r':???????????????????? /*接收数据*/
??? case'R':
??? {
???? while(!(inportb(port+5)&0x20));?????
???? outportb(port,0x02);??????????? /*发送数据02通知单片机发送数据*/
???? for(j=0;j<9;j++)?????????????? /*共接收9个数据*/
???? {
????? while(!(inportb(port+5)&1));
???? ch[j]=inportb(port);
???? }
???? for(j=0;j<9;j++)
???? printf("\n %d\n",ch[j]);
???? getch();
???? break;
???? }
??? }
? }
}