数码管显示ds1302时间，显示的结果很怪异，求指点迷津

2019-07-15 20:48发布

#include<reg51.h>
#include<intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit sck=P1^0;
sbit io=P1^1;
sbit rst=P3^6;

sbit smgen=P2^3;

unsigned char code smg_du[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00,0x10};
unsigned char code smg_we[]={0x08,0x18,0x28,0x38,0x48,0x58,0x68,0x78};

uchar time_data[7]={10,6,4,17,11,58,30};
uchar time_add[7]={0x8c,0x8a,0x88,0x86,0x84,0x82,0x80};
uchar read_add[7]={0x8d,0x8b,0x89,0x87,0x85,0x83,0x81};
uchar disp[8];

void write_ds1302_byte(uchar dat);
void write_ds1302(uchar add,uchar dat);
uchar read_ds1302(uchar add);
void set_rtc(void);
void read_rtc(void);
void time_pros(void);

void delay_50ms(uint t)
{
uint j;
for(;t>0;t--)
  for(j=6245;j>0;j--);
}

void write_ds1302_byte(uchar dat)
{
  uchar i;
  for(i=0;i<8;i++)
  {
sck=0;
io=dat&0x01;
dat=dat>>1;
sck=1;
  }
}

void write_ds1302(uchar add,uchar dat)
{
  rst=0;
  _nop_();
  sck=0;
  _nop_();
  rst=1;
  _nop_();
  write_ds1302_byte(add);
  write_ds1302_byte(dat);
  rst=0;
  _nop_();
  io=1;
  sck=1;
}

uchar read_ds1302(uchar add)
{
  uchar i;             uchar value;
  rst=0;
  _nop_();
  sck=0;
  _nop_();
  rst=1;
  _nop_();
  write_ds1302_byte(add);
  for(i=0;i<8;i++)
  {
value=value>>1;
sck=0;
if(io)
value=value|0x80;
sck=1;
}

  rst=0;
  _nop_();
  sck=0;
_nop_();
sck=1;
io=1;
return value;
}

void set_rtc(void)
{
  uchar i,j;
  for(i=0;i<7;i++)
  {
j=time_data[i]/10;
time_data[i]=time_data[i]%10;
time_data[i]=time_data[i]+j*16;
  }

  write_ds1302(0x8e,0x00);

  for(i=0;i<7;i++)
  {
write_ds1302(time_add[i],time_data[i]);
  }
write_ds1302(0x8e,0x80);
}

void read_rtc(void)
{
uchar i;
for(i=0;i<7;i++)
{
  time_data[i]=read_ds1302(read_add[i]);
}

}

void time_pros(void)
{
disp[0]=time_data[6]%16;
disp[1]=time_data[6]/16;
disp[2]=17;

disp[3]=time_data[5]%16;
disp[4]=time_data[5]/16;
disp[5]=17;

disp[6]=time_data[4]%16;
disp[7]=time_data[4]/16;
}

void display(void)
{
  uchar i;
  for(i=0;i<8;i++)
  {
P1=smg_du[disp[i]];
P2=smg_we[i];
  delay_50ms(20);
  }

}

void main(void)
{
set_rtc();
while(1)
{
  smgen=0;
  read_rtc();
  smgen=1;
  time_pros();
  display();

}

}