如何画这段单片机代码的流程框图 -

标题: 如何画这段单片机代码的流程框图 [打印本页]

作者: 15200yoxi 时间: 2022-12-15 16:41
标题: 如何画这段单片机代码的流程框图
#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit sda=P1^1;
sbit scl=P1^0;
void delay();
void delay1();
void start();
void stop();
uchar read(uchar address0,uchar wordaddress,uchar address1);
uchar year=0,month=0,date=0,hour=0,minute=0,second=0;
void main()
{
         while(1)
         {       second=read(0xd0,0x00,0xd1);
                  minute=read(0xd0,0x01,0xd1);
                  hour=read(0xd0,0x02,0xd1);
                  date=read(0xd0,0x04,0xd1);
                  month=read(0xd0,0x05,0xd1);
                  year=read(0xd0,0x06,0xd1);
                        P0=hour;
                        P2=minute;
                        P3=second;
            delay1();
                        P0=year;
                        P2=month;
                        P3=date;
            delay1();
}
}
void delay1()
{
         uint i,j;
         for(i=0;i<1000;i++)
         for(j=0;j<125;j++);
         }
void start()
{
         scl=1;
         delay();
         sda=1;
         delay();
         sda=0;
         delay();
}
void delay()
{       uchar i=125;
         while(i>0)
         i--;
}
void stop()
{
         scl=1;
         delay();
         sda=0;
         delay();
         sda=1;
         delay();
}
uchar read(uchar address0,uchar wordaddress,uchar address1)
{
         uchar a,a0,i,n,data1;
         start();
         for(n=0;n<3;n++)
         {
                  if(n==0)a0=address0;
         else if(n==1)a0=wordaddress;
         else if(n==2)
                  {
                  start();
                  a0=address1;
                  }
         for(i=0;i<8;i++)
                  {
                  scl=0;
                  delay();
                  a=a0;
                  a=a&0x80;
                  if(a==0x80)
                        sda=1;
                  else
                        sda=0;
                  delay();
                  scl=1;
                  delay();
                  scl=0;
                  delay();
                  a0=a0<<1;
                  }
         sda=1;
         delay();
         scl=1;
         delay();
         scl=0;
         }
         for(i=0;i<8;i++)
         {
                  data1=data1<<1;
                  sda=1;
                  delay();
                  scl=0;
                  delay();
                  scl=1;
                  delay();
                  if(sda==1)
                        data1|=0x01;
         }
         scl=0;
         delay();
         sda=1;
         delay();
         stop();
         return data1;
}

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