开关量输入，pc端和单片机相连

ID:215989 · 发表于 2017-6-30 06:35

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit sw_0=P3^3;//开关端口定义  switch
sbit sw_1=P3^4;
sbit sw_2=P3^5;
sbit sw_3=P3^6;
//sbit PS0=P2^4;
//sbit PS1=P2^5;
//sbit PS2=P2^6;
//sbit PS3=P2^7;
sfr P_data=0x80;
sbit P_K_L=P2^2;
uchar code tab[]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6,0xee,0x3e,0x9c,0x7a,0x9e,0x8e};    //字段转换表
uchar rec[50];    //不能超过50
uchar code error[]={0x40,0x30,0x46,0x2a,0x2a,0x37,0x36,0x0d}; //数据不正确
uchar send[]={0x40,0x30,0x46,0x30,0x32,0x00,0x00,0x00,0x00,0x00,0x00,0x0d};    //正确的数据
uchar i;
uchar t;
uint sw_in(void); //开关量输入采集
void display(uint);
void delay(uint);
uint dth(uint);    //16~10
uchar ath(uchar,uchar);    //ASCII~16
uint hta(uchar);    //16~ASCII
void uart(void);
void main(void)
{
uint a,b,c,t;
TMOD=0x20;
TL1=0xfd;
TH1=0xfd;
SCON=0x50;
TR1=1;    //为1是定时器T1开始计数；0时不计数。
IE=0x90;
while(1)
{
   c=sw_in();
   t=dth(c);
   a=hta(t>>8);
   send[5]=a>>8;
   send[6]=(uchar)a;
   a=hta(t);
   send[7]=a>>8;
   send[8]=(uchar)a;
   b=0;
   for(a=1;a<9;a++)
   b^=send[a];
   b=hta(b);
   send[9]=b>>8;
   send[10]=(uchar)b;
   for(a=0;a<100;a++)
      display(c);
}
}
//数码管显示函数没写
uint dth(uint a)
{
uint b,c;
b=a%16;
if(b>9)
   c=b+6;
else
   c=b;
a=a/16;
b=a%16;
if(b>9)
   c+=(b+6)*10;
else
   c=c+b*100;
a=a/16;
b=a%16;
if(b>9)
   c+=(b+6)*1000;
else
   c=c+b*1000;
return c;
}
void delay(uint delay_time)
{
for(delay_time=20;delay_time>0;delay_time--)
{}
}
uchar ath(uchar a,uchar b)
{
if(a<0x40)
   a-=0x30;
else if(a<0x47)
   a-=0x37;
   else if(a<67)
      a-=0x57;
if(b<0x40)
   b=-0x30;
else if(b<0x47)
   b-=0x37;
   else if(b<67)
      b-=0x57;
return((a<<4)+b);
}
uint hta(uchar a)
{
uint b;
b=a>>4;
a&=0x0f;
if(a<0x0a)
   a+=0x30;
else
   a+=0x37;
if(b<0x0a)
   b+=0x30;
else
   b+=0x37;
b=((b<<8)+a);
return b;

}
void uart(void) interrupt 4    //检查过了
{
uchar a,b;
if(RI)
{
   a=SBUF;
   RI=0;
   if(a==0x40)//
      i=0;
   rec[i]=a;
   i++;
   if(a==0x0d)//
   {
      if(ath(rec[1],rec[2])==15)
   {
      b=0;
for(a=1;a<i-3;a++)
b^=rec[a];
if(b==ath(rec[i-3],rec[i-2]))
{
   if((ath(rec[3],rec[4])&0x01)==0)    //
   {
      for(a=0;a<12;a++)    //
   {
      SBUF=send[a];
   while(TI!=1);
   TI=0;
   }
   }
}
else //
{
   for(a=0;a<8;a++)    //
   {
      SBUF=error[a];
   while(TI!=1);
   TI=0;
   }
}
   }
   }
}
else
{
   TI=0;
}
}
开关量输入，pc端和单片机相连

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