例程（库中自带的）
/*
Example sketch for interfacing with the DS1302 timekeeping chip.
Copyright (c) 2009, Matt Sparks
All rights reserved.
http://quadpoint.org/projects/arduino-ds1302
*/
#include <stdio.h>
#include <string.h>
#include <DS1302.h>
/* Set the appropriate digital I/O pin connections */
unsigned int CE_PIN = 3;
unsigned int IO_PIN = 4;
unsigned int SCLK_PIN = 5;
/* Create buffers */
char buf[50];
char day[10];
/* Create a DS1302 object */
DS1302 rtc(CE_PIN, IO_PIN, SCLK_PIN);
void print_time()
{
/* Get the current time and date from the chip */
Time t = rtc.time();
/* Name the day of the week */
memset(day, 0, sizeof(day)); /* clear day buffer */
switch (t.day) {
case 1:
strcpy(day, "Sunday");
break;
case 2:
strcpy(day, "Monday");
break;
case 3:
strcpy(day, "Tuesday");
break;
case 4:
strcpy(day, "Wednesday");
break;
case 5:
strcpy(day, "Thursday");
break;
case 6:
strcpy(day, "Friday");
break;
case 7:
strcpy(day, "Saturday");
break;
}
/* Format the time and date and insert into the temporary buffer */
snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
day,
t.yr, t.mon, t.date,
t.hr, t.min, t.sec);
/* Print the formatted string to serial so we can see the time */
SerialUSB.println(buf);
}
void setup()
{
/* Initialize a new chip by turning off write protection and clearing the
clock halt flag. These methods needn't always be called. See the DS1302
datasheet for details. */
rtc.write_protect(false);
rtc.halt(false);
/* Make a new time object to set the date and time */
/* Tuesday, May 19, 2009 at 21:16:37. */
Time t(2009, 5, 19, 21, 16, 37, 3);
/* Set the time and date on the chip */
rtc.time(t);
}
/* Loop and print the time every second */
void loop()
{
print_time();
delay(1000);
}
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