DS1302是DALLAS公司推出的一种高性能、低功耗、带ＲＡＭ的实时时钟芯片，它可以对年、月、日、周、时、分、秒进行计时，具有闰年补偿功能，最大有效年分可达２１００年。
本例运行时，每隔0.5s读取DS1302实时是钏芯片时间数据，通过格式转换后显示在1602LCD上
Proteus运行时截图：
Atmel Studio6.2编译通过的截图：
程序清单：
主程序：
- /*
- * GccApplication27.c
- *
- * Created: 2014-12-4 18:47:28
- * Author: Administrator
- */
- #define F_CPU 1000000UL
- #include <avr/io.h>
- #include <util/delay.h>
- #include <string.h>
- #include <stdio.h>
- #include <stdint.h>
- extern void Initialize_LCD();
- extern void LCD_ShowString(uint8_t x,uint8_t y,char *str);
- extern void GetDateTime();
- extern uint8_t DateTime[];
- extern char *WEEK[];
- char LCD_DSY_BUFFER[17];
- int main()
- {
- DDRA = 0xFF;
- DDRC = 0xFF;
- DDRD = 0xFF;
- Initialize_LCD();
- while(1)
- {
- GetDateTime();
- //按格式：“DATA 00 - 00 - 00XX”显示年月日与星期
- sprintf(LCD_DSY_BUFFER,"DATE %02d - %02d - %02d%3s ",DateTime[6],DateTime[4],DateTime[3],WEEK[DateTime[5]-1]);
- LCD_ShowString(0,0,LCD_DSY_BUFFER);
- sprintf(LCD_DSY_BUFFER,"TIME %02d:% 02d:% 02d",DateTime[2],DateTime[1],DateTime[0]);
- LCD_ShowString(0,1,LCD_DSY_BUFFER);
- _delay_ms(100);
- }
- }
时钟程序：
- #define F_CPU 1000000UL
- #include <avr/io.h>
- #include <util/delay.h>
- #include <stdint.h>
- //DS1302引脚定义
- #define IO PA0
- #define SCLK PA1
- #define RST PA2
- //DS1302 端口定义
- #define DS_PORT PORTA
- #define DS_DDR DDRA
- #define DS_PIN PINA
- //DS1302端口数据读/写(方向)
- #define DDR_IO_RD() DS_DDR &= ~_BV(IO)
- #define DDR_IO_WR() DS_DDR |= _BV(IO)
- //DS1302 控制引脚操作定义
- #define WR_IO_0() DS_PORT &= ~_BV(IO)
- #define WR_IO_1() DS_PORT |= _BV(IO)
- #define RD_IO() (DS_PIN & _BV(IO))
- #define SCLK_1() DS_PORT |= _BV(SCLK)
- #define SCLK_0() DS_PORT &=~_BV(SCLK)
- #define RST_1() DS_PORT |= _BV(RST)
- #define RST_0() DS_PORT&=~_BV(RST)
- char * WEEK[] = {"SUN","MON","TUS","WEN","THU","FRI","SAT"};
-
- uint8_t DateTime[7];
- void Write_Byte_TO_DS1302(uint8_t x)
- {
- uint8_t i;
- DDR_IO_WR();
- for(i=0x01;i !=0x00;i<<=1)
- {
- if(x & i)WR_IO_1();else WR_IO_0();SCLK_0();SCLK_1();
- }
- }
- uint8_t Get_Byte_FROM_DS1302()
- {
- uint8_t i,dat = 0x00;
- DDR_IO_RD();
- for(i=0;i<8;i++)
- {
- SCLK_1();SCLK_0();if (RD_IO()) dat |= _BV(i);
- }
- return dat/16*10 + dat % 16;
- }
- uint8_t Read_Data(uint8_t addr)
- {
- uint8_t dat;
- RST_1();
- Write_Byte_TO_DS1302(addr);
- dat = Get_Byte_FROM_DS1302();
- RST_0();
- return dat;
- }
- void GetDateTime()
- {
- uint8_t i,addr = 0x81;
- for(i = 0;i<7;i++)
- {
- DateTime[i] = Read_Data(addr);
- addr + = 2;
- }
- }
ＬＣＤ显示程序：
- /*
- * GccApplication26.c
- *
- * Created: 2014-12-2 20:34:45
- * Author: Administrator
- */
- #define F_CPU 1000000UL
- #include <avr/io.h>
- #include <util/delay.h>
- #include <stdint.h>
- #define RS PD0
- #define RW PD1
- #define E PD2
- #define LCD_CRTL_PORT PORTD
- #define LCD_PORT PORTC
- #define LCD_PIN PINC
- #define LCD_DDR DDRC
- #define RS_1() LCD_CRTL_PORT|=_BV(RS)
- #define RS_0() LCD_CRTL_PORT&=~_BV(RS)
- #define RW_1() LCD_CRTL_PORT|=_BV(RW)
- #define RW_0() LCD_CRTL_PORT&=~_BV(RW)
- #define EN_1() LCD_CRTL_PORT|=_BV(E)
- #define EN_0() LCD_CRTL_PORT&=~_BV(E)
- void LCD_BUSY_WAIT()
- {
- RS_0(); RW_1();
- LCD_DDR = 0x00;
- EN_1(); _delay_us(20);
- //loop_until_bit_is_clear(LCD_PIN,7);
- EN_0();
- LCD_DDR = 0xFF;
- }
- void Write_LCD_Command(uint8_t cmd)
- {
- LCD_BUSY_WAIT();
- RS_0(); RW_0();
- LCD_PORT = cmd;
- EN_1(); EN_0();
- }
- void Write_LCD_Data(uint8_t dat)
- {
- LCD_BUSY_WAIT();
- RS_1(); RW_0();
- LCD_PORT = dat;
- EN_1(); EN_0();
- }
- void Initialize_LCD()
- {
- Write_LCD_Command(0x38);_delay_ms(15);
- Write_LCD_Command(0x01);_delay_ms(15);
- Write_LCD_Command(0x06);_delay_ms(15);
- Write_LCD_Command(0x0c);_delay_ms(15);
-
- }
- void LCD_ShowString(uint8_t x,uint8_t y,char *str)
- {
- uint8_t i = 0;
- if(y == 0)Write_LCD_Command(0x80 | x);
- else if(y == 1)Write_LCD_Command(0xC0 | x);
- for(i = 0; i<16 && str[i]!='\0';i++)
- Write_LCD_Data(str[i]);
- }
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