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