2.8_void lcdshowstr(unsigned char x, unsigned char y, -优快云博客

本文介绍了一个基于51单片机的实时钟显示程序，利用LCD1602显示器显示时间，并通过外部EEPROM存储时间数据。程序实现了时间的自动更新和显示，包括小时、分钟和秒数。

#include<reg52.h>

extern void InitLcd1602();
extern void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str);
void ShowBcdByte(unsigned char x,unsigned char y,unsigned char bcd);
extern void E2Read(unsigned char *buf,unsigned char addr,unsigned char len);
extern void E2Write(unsigned char *buf,unsigned char addr,unsigned char len);

unsigned char sec=0;
unsigned char min=0;
unsigned char hour=12 ;
bit flag = 0;

void main()
{
unsigned char buf[4];

EA = 1;
TMOD = 0x01;
TH0 = 0xFC;
TL0 = 0x67;
ET0 = 1;
TR0 = 1;

InitLcd1602();
LcdShowStr(4,1," : : ");

while(1)
{
E2Read(buf,0x20,sizeof(buf));
MemToStr(str,buf,sizeof(buf));
if(flag == 1)
{
flag = 0;
sec++;
if(sec >= 60)
{
sec = 0;
min++;
if(min >= 60)
{
min = 0;
hour++;
if(hour >= 24)
{
hour = 0;
}
}
}
buf[0] = sec;
buf[1] = min;
buf[2] = hour;
E2Write(buf,0x20,sizeof(buf));
}
ShowBcdByte(4,1,hour);
ShowBcdByte(7,1,min);
ShowBcdByte(10,1,sec);
}
}

void MemToStr(unsigned char *str,unsigned char *src,unsigned char len)
{
unsigned char tmp;

while(len--)
{
tmp = *src>>4;
if(tmp <= 9)
*str++ = tmp + '0';
else
*str++ = tmp - 10 + 'A';

tmp = *src&0x0F;
if(tmp <= 9)
*str++ = tmp + '0';
else
*str++ = tmp - 10 + 'A';
*str++ = ' ';
src++;

}
}

void ShowBcdByte(unsigned char x,unsigned char y,unsigned char bcd)
{
unsigned char str[3];

str[0] = (bcd/10)+'0';
str[1] = (bcd%10)+'0';
str[2] = '\0';
LcdShowStr(x,y,str);
}

void InterruptTimer0() interrupt 1
{
static unsigned int cnt = 0;

TH0 = 0xFC;
TL0 = 0x67;
cnt++;
if(cnt >= 1000)
{
cnt = 0;
flag = 1;
}
}