ok.c

c语言写的单片机程序

#define TIME_OVER 100

#include<reg52.h>
#include<stdlib.h>
#include<string.h>


unsigned char *compare=0x0040;
unsigned char *indata=0x0050;
int	wait=0;
int	exam=0;

void serial_init();
void send(char);
void send_string(const char *);
void receive_string();
int compare_string(char *);

void main(){
	int i;
	int test=1;
	wait=0;
	exam=0;
	serial_init();
	for(;;){
		receive_string();
		if(wait!=0) exam++;
		if(exam>=TIME_OVER){
			*compare=NULL;
		  	compare=0x0040;
		  	test=compare_string(compare);
			switch(test){
				case 0:{
					send_string("error");
					break;
				}
				case 1:{
					send_string("ccc1500cccc1000000ccc");
/*					*indata='$';
					indata++;
					*indata=0x50;
					indata++;
					*indata=0x51;
					indata++;
					*indata='$';
					indata++;
					*indata=0x52;
					indata++;
					*indata=0x80;
					indata++;
					*indata='$';
					indata++;
					*indata=NULL;
					indata=0x0050;	
				  	send_string(indata);
					indata=0x0050;
*/					break;
				}
				case 2:{
					send_string("write ram");
					break;
				}
				case 3:{
					send_string("ram format");
					break;
				}
				case 4:{
					send_string("hello");
					break;
				}
				case 5:{
					for(i=0;i<100;i++)
					send_string("go go go ");
					break;
				}
				default:{
					break;
				}						
			}
			wait=0;
			exam=0;
			compare=0x0040;
			test=5;
		  }
	}
	return;
} 

void send_string(char *string){
	char *read_string=string;
	char *buffer=string;
	int COUNT=strlen(read_string);
    for(;COUNT!=0;COUNT--){
		send(*buffer);
		buffer++;
	}
}

void send(char a){
	SBUF=a;
		while(TI!=1);TI=0;
}

void serial_init()
{
 	SCON=0x50;
	PCON=0;
	TMOD=0X20;
	TH1=0xfd;
	TL1=0xfd;
	TR1=1;
	ET1=1;
    return;
}

void receive_string(){
	unsigned char temp;
	if(RI==1) { 
 		wait++;
        exam=0;
  		RI=0;
  	    temp=SBUF;
  	    *compare=temp;
        compare++;
		return;
	}
	return;	
}

int compare_string(char *test){
	char *comp=test;
	char *temp="1";
	if(strcmp(temp,comp)==0){return 1;}
	temp="2";
	if(strcmp(temp,comp)==0){return 2;}
	temp="3";
	if(strcmp(temp,comp)==0){return 3;}
	temp="4";
	if(strcmp(temp,comp)==0){return 4;}
	temp="5";
	if(strcmp(temp,comp)==0){return 5;}
	return 0;			
}