在LCD1602上面显示DS1302掉电时钟和日期

主函数文件：

#include <reg52.h>#include "./delay/delay.h"#define ds1302_sec_add0x80#define ds1302_min_add0x82#define ds1302_hr_add0x84#define ds1302_date_add0x86#define ds1302_month_add0x88#define ds1302_day_add0x8a#define ds1302_year_add0x8c#define ds1302_charger_add0x90 #define ds1302_control_add0x8e #define ds1302_clkburst_add0xbesbit RST = P1^0;sbit SCK = P1^1;sbit IO = P1^2;sbit RS = P2^4;sbit RW = P2^5;sbit E  = P2^6;#define LCDPORT P0#define LCD_WRITE_DATA 1#define LCD_WRITE_COM  0unsigned char timebuf[7] = {16,48,40,16,8,17,3};unsigned char tempbuf[3];unsigned char writebuf[7];unsigned char readbuf[7];unsigned char disbuf[3];void lcd1602_write(unsigned char byte,unsigned char flag){  if(flag){  RS = 1;}else{  RS = 0; }RW = 0; E = 1; LCDPORT = byte;delay_us(5);E = 0;}void lcd1602_dis_str(unsigned char x, unsigned char y, unsigned char *str){  if((x > 15) || (y > 1)){  return ;}if(0 == y){  lcd1602_write(0x80 + x,LCD_WRITE_COM);}else{  lcd1602_write(0x80 + 0x40 + x,LCD_WRITE_COM);}while(*str != '\0'){  lcd1602_write(*str,LCD_WRITE_DATA);  str++;}}void lcd_init(){  delay_ms(15);  lcd1602_write(0x38,LCD_WRITE_COM);  delay_ms(5);lcd1602_write(0x38,LCD_WRITE_COM);   delay_ms(5);lcd1602_write(0x38,LCD_WRITE_COM);   delay_ms(5);lcd1602_write(0x38,LCD_WRITE_COM);   delay_ms(5);lcd1602_write(0x08,LCD_WRITE_COM);   delay_ms(5);lcd1602_write(0x01,LCD_WRITE_COM);   delay_ms(5);  lcd1602_write(0x06,LCD_WRITE_COM);   delay_ms(5);lcd1602_write(0x0c,LCD_WRITE_COM);   delay_ms(5);}void ds1302_write_byte(unsigned char addr, unsigned char byte){  unsigned char i;  addr = addr & 0xfe;  SCK = 0;  RST = 0;   RST = 1;  for(i = 0; i < 8; i++)  {  IO = addr & 0x01;  SCK = 0;  SCK = 1;addr >>= 1;  }for(i = 0; i < 8; i++)  {  IO = byte & 0x01;  SCK = 0;  SCK = 1;byte >>= 1;  }  SCK = 0;  RST = 0;}unsigned char ds1302_read_byte(unsigned char addr){  unsigned char i;  unsigned char temp;  addr = addr & 0xfe;  SCK = 0;  RST = 0;    RST = 1;  addr = addr + 1;  for(i = 0; i < 8; i++)  {  IO = addr & 0x01;  SCK = 0;  SCK = 1;addr >>= 1;  }for(i = 0; i < 8; i++){  SCK = 1;  SCK = 0;  temp >>= 1;  if(IO){   temp += 0x80;}}RST = 0;return temp;}void ds1302_write_time(){  unsigned char temp;  unsigned char temp1;  unsigned char i;  for(i = 0; i < 7; i++)  {  temp = timebuf[i] / 10;  temp1 = timebuf[i] % 10;  writebuf[i] = (temp << 4) | temp1;}ds1302_write_byte(ds1302_control_add,0x00);ds1302_write_byte(ds1302_hr_add,writebuf[0]);ds1302_write_byte(ds1302_min_add,writebuf[1]);ds1302_write_byte(ds1302_sec_add,writebuf[2]);ds1302_write_byte(ds1302_year_add,writebuf[3]);ds1302_write_byte(ds1302_month_add,writebuf[4]);ds1302_write_byte(ds1302_date_add,writebuf[5]);ds1302_write_byte(ds1302_day_add,writebuf[6]);ds1302_write_byte(ds1302_control_add,0x80);}void ds1302_read_time(){  unsigned char i;unsigned char temp;  unsigned char temp1;    readbuf[0] = ds1302_read_byte(ds1302_hr_add);  readbuf[1] = ds1302_read_byte(ds1302_min_add);  readbuf[2] = ds1302_read_byte(ds1302_sec_add);  readbuf[3] = ds1302_read_byte(ds1302_year_add);  readbuf[4] = ds1302_read_byte(ds1302_month_add);  readbuf[5] = ds1302_read_byte(ds1302_date_add);  for(i = 0; i < 6; i++)  {  temp = (readbuf[i] >> 4);  temp1 = (readbuf[i] & 0x0f);  disbuf[i] = temp * 10 + temp1;}switch(ds1302_read_byte(ds1302_day_add)){  case 1:{  lcd1602_dis_str(12,1,"MON");  break;}case 2:{  lcd1602_dis_str(12,1,"TUE");    break;        }case 3:{  lcd1602_dis_str(12,1,"WED");  break;}case 4:{  lcd1602_dis_str(12,1,"THU");  break;}case 5:{  lcd1602_dis_str(12,1,"FRI");  break;}case 6:{  lcd1602_dis_str(12,1,"SAT");  break;}case 7:{  lcd1602_dis_str(12,1,"SUN");    break;        }}}void lcd_dis_time(){  unsigned char lcddisbuf[9] = {0};    unsigned char daydisbuf[9] = {0};    lcddisbuf[0] = (disbuf[0] / 10) + 0x30;    lcddisbuf[1] = (disbuf[0] % 10) + 0x30;    lcddisbuf[2] = ':';    lcddisbuf[3] = (disbuf[1] / 10) + 0x30;    lcddisbuf[4] = (disbuf[1] % 10) + 0x30;    lcddisbuf[5] = ':';    lcddisbuf[6] = (disbuf[2] / 10) + 0x30;    lcddisbuf[7] = (disbuf[2] % 10) + 0x30;    daydisbuf[0] = (disbuf[3] / 10) + 0x30;    daydisbuf[1] = (disbuf[3] % 10) + 0x30;    daydisbuf[2] = '-';    daydisbuf[3] = (disbuf[4] / 10) + 0x30;    daydisbuf[4] = (disbuf[4] % 10) + 0x30;    daydisbuf[5] = '-';    daydisbuf[6] = (disbuf[5] / 10) + 0x30;    daydisbuf[7] = (disbuf[5] % 10) + 0x30;    lcd1602_dis_str(4,0,lcddisbuf);    lcd1602_dis_str(1,1,daydisbuf);}void main(){  lcd_init();  ds1302_write_time();  while(1){  ds1302_read_time();  lcd_dis_time();}}

延时函数文件：

void delay_us(unsigned char t){    while(--t);}void delay_ms(unsigned char t){    while(t--){        delay_us(245);  delay_us(245);    }}void delay_s(unsigned char t){    while(t--)    {    delay_ms(200);  delay_ms(200);  delay_ms(200);  delay_ms(200);  delay_ms(200);    }}