Arduino与Proteus仿真实例-DS1302实时时钟驱动仿真

DS1302实时时钟驱动仿真

DS1302 涓流充电计时芯片包含一个实时时钟/日历和 31 字节的静态 RAM。它通过一个简单的串行接口与微处理器通信。实时时钟/日历提供秒、分、小时、日、日、月和年信息。对于少于 31 天的月份，月末日期会自动调整，包括闰年的更正。时钟以 24 小时或 12 小时格式运行，带有 AM/PM 指示器。

在前面的实例中，对DS1302做了详细的介绍，请参考：

8051单片机Proteus仿真与开发实例-DS1302 RTC驱动仿真

1、仿真电路原理图

2、仿真代码实现

本次实例使用到如下开源库：

https://github.com/Makuna/Rtc

简单的演示代码如下：

// CONNECTIONS:
// DS1302 CLK/SCLK --> 5
// DS1302 DAT/IO --> 4
// DS1302 RST/CE --> 2
// DS1302 VCC --> 3.3v - 5v
// DS1302 GND --> GND

#include <ThreeWire.h> 
#include <RtcDS1302.h>

ThreeWire myWire(4,5,2); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);

void setup () 
{
    Serial.begin(57600);

    Serial.print("compiled: ");
    Serial.print(\_\_DATE\_\_);
    Serial.println(\_\_TIME\_\_);

    Rtc.Begin();

    RtcDateTime compiled = RtcDateTime(\_\_DATE\_\_, \_\_TIME\_\_);
    printDateTime(compiled);
    Serial.println();

    if (!Rtc.IsDateTimeValid()) 
    {
        // Common Causes:
        // 1) first time you ran and the device wasn't running yet
        // 2) the battery on the device is low or even missing

        Serial.println("RTC lost confidence in the DateTime!");
        Rtc.SetDateTime(compiled);
    }

    if (Rtc.GetIsWriteProtected())
    {
        Serial.println("RTC was write protected, enabling writing now");
        Rtc.SetIsWriteProtected(false);
    }

    if (!Rtc.GetIsRunning())
    {
        Serial.println("RTC was not actively running, starting now");
        Rtc.SetIsRunning(true);
    }

    RtcDateTime now = Rtc.GetDateTime();
    if (now < compiled) 
    {
        Serial.println("RTC is older than compile time! (Updating DateTime)");
        Rtc.SetDateTime(compiled);
    }
    else if (now > compiled) 
    {
        Serial.println("RTC is newer than compile time. (this is expected)");
    }
    else if (now == compiled) 
    {
        Serial.println("RTC is the same as compile time! (not expected but all is fine)");
    }
}

void loop () 
{
    RtcDateTime now = Rtc.GetDateTime();

    printDateTime(now);
    Serial.println();

    if (!now.IsValid())
    {
        // Common Causes:
        // 1) the battery on the device is low or even missing and the power line was disconnected
        Serial.println("RTC lost confidence in the DateTime!");
    }

    delay(1000); // 1 seconds
}

#define countof(a) (sizeof(a) / sizeof(a[0]))

void printDateTime(const RtcDateTime& dt)
{
    char datestring[20];

    snprintf\_P(datestring, 
            countof(datestring),
            PSTR("%02u/%02u/%04u %02u:%02u:%02u"),
            dt.Month(),
            dt.Day(),
            dt.Year(),
            dt.Hour(),
            dt.Minute(),
            dt.Second() );
    Serial.print(datestring);
}