檢視Application - DS1302 ,RTC module的原始碼

[[File:Rpi rtc.jpg|border|400px]]
== Hardware ==
[[File:Real-time-clock-connection.jpg|border|RPi with DS1302]]
* In version 2 Pi GPIO27 is in place of GPIO21 (same pin)
== Software ==
* [http://www.hobbytronics.co.uk/download/rtc-pi.zip,  Real Time Clock Source Code]
<pre>
 Modify the following GPIO definition for RPi 2
 #define GPIO_ADD 0x20200000L                          ->  #define GPIO_ADD 0x3F000000L
 #define SCLK_OUTPUT *(gpio+GPIO_SEL2) &= 0xFFFFFFC7L  ->  #define SCLK_OUTPUT *(gpio+GPIO_SEL2) &= 0xFF1FFFFFL
 #define SCLK_HIGH *(gpio+GPIO_SET) = 0x00200000L      ->  #define SCLK_HIGH *(gpio+GPIO_SET) = 0x08000000L
 #define SCLK_LOW *(gpio+GPIO_CLR) = 0x00200000L       ->  #define SCLK_LOW *(gpio+GPIO_CLR) = 0x08000000L
</pre>

== Reference ==
* [http://www.hobbytronics.co.uk/raspberry-pi-real-time-clock, Raspberry Pi Real Time Clock]