keil代码

1万 · 2019-5-9 22:29

STC开发板上的一段程序一直出错，正常情况下是P1口的第一个LED亮，但是执行时什么都不亮。
代码如下：#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit sda=P2^0;
sbit scl=P2^1;

uchar a;

//define 函数
void delay();
void start();
void response();
uchar read_byte();
void write_byte(uchar dat);
void init();
void stop();
void delay1(uint z);

void delay()
{
      uint i,j;
      for(i=0;i<1;i++)
  for(j=0;j<1;j++);
}

void start()
{
      sda=1;
      delay();
      scl=1;
      delay();
      sda=0;
      delay();

}

void stop()
{
      sda=0;
      delay();
      scl=1;
      delay();
      sda=1;
      delay();
}

void response()
{
      uchar i;
      scl=1;
      delay();
      while((sda==1)&&(i<255))i++;
      scl=0;//destroy the condition of response, to avoid response.
      delay();

}

uchar read_byte()
{
      uchar i,j,k;
      scl=0;
      delay();
      sda=1;
      delay();
      for(i=0;i<8;i++)
      {
            scl=1;delay();
            k=((k<<1)|sda);
            scl=0;delay();
      }
      return k;
}

void write_byte(uchar date)
{
      uchar i,temp;
      temp=date;
      for(i=0;i<8;i++)
      {
            temp=temp<<1;
            scl=0;//写byte时把时钟拉低
            delay();
            sda=CY;// spill registor
            delay();
            scl=1;
            delay();

      }
      scl=0;
      delay();
      sda=1;
      delay();
}

void init()//bus initation
{
      scl=1;
      delay();
      sda=1;
      delay();
}

void main()
{
init();
start();
write_byte(0xa0);
response();
write_byte(3);
response();
write_byte(0xfe);
response();
stop();

delay1(100);

start();
write_byte(0xa0);
response();
write_byte(3);
response();
start();
write_byte(0xa1);
response();
a=read_byte();
P1=a;
response();
stop();
while(1);

}

void delay1(uint z){
uint i,j;
for(i=0;i<z;i++)
for(j=0;j<100;j++);
}