基于PIC16f877的USART端口的多机通信

#include <pic.h> void delay(void); void send(char adr,char data); int zhang=0; main() { int a=0; TRISB=0XFF; TRISD=0; TRISC6=0; BRGH=1; SPBRG=129; TXEN=1; TX9=1; TX9D=1; SYNC=0; SPEN=1; CREN=1; RX9=0; RCIE=1; PEIE=1; GIE=1; while(1) { zhang=0xfa; /*a=PORTB; PORTD=a; switch(a) { case 0x01: zhang=0xfa; case 0x02: zhang=0xfb; case 0x04: zhang=0xfc; case 0x08: zhang=0xfe; }*/ } } void send(char adr,char data) { TX9D=1; TXREG=adr; TX9D=0; while(TRMT==0); /*char temp,x,y; x='a'; if(data-'a'<14) { temp=data+1; } else if(data-'a'>=14|data-'a'<20) { temp=data+2; } else if(data-'a'>=20) { temp=data+3; } temp=data; temp=~temp; temp=temp+1;*/ TXREG=data; } void interrupt dddd(void) { if(RCIF==1) { send(zhang,RCREG); RCIF=0; } }