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Add documentation for the GPIOs

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Signed-off-by: Joachim Strömbergson <joachim@assured.se>
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Joachim Strömbergson 2022-12-19 11:47:12 +01:00
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doc/system_description/fpga.md
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@ -150,7 +150,13 @@ includes:
- Read access to the 32 bit FPGA design version, expressed as an integer
- Control and status access for the RGB LED on TKey board
- Control ans status access for the 4 GPIOs on the TKey board
- Control and status access for the 4 GPIOs on the TKey board
- GPIO 1 and 2 are inputs and provide read access to the
current sampled value digital values on the pins.
- GPIO 3 and 4 are outputs. The digital value written to
the bits will be presented on the pins.
- Application read access to information about the loaded
application. The information is written by the firmware.