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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
parent 7a9019d867
commit 8a5a338473
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2 changed files with 9 additions and 2 deletions
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8
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.

3
doc/system_description/software.md
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@ -522,7 +522,8 @@ Assigned core prefixes:
| `SWITCH_APP` | r/w | r | 1B | u8 | | Write anything here to trigger the switch to application mode. Reading |
| | | | | | | returns 0 if device is in firmware mode, 0xffffffff if in app mode. |
| `LED` | w | w | 1B | u8 | | |
| `GPIO` | | | | | | |
| `GPIO` | r/w | r/w | 1B | u8 | | Bits 0 and 1 contain the input level of GPIO 1 and 2. |
| | | | | u8 | | Bits 3 and 4 store the output level of GPIO 3 and 4. |
| `APP_ADDR` | r/w | r | 4B | u32 | | Firmware stores app load address here, so app can read its own location |
| `APP_SIZE` | r/w | r | 4B | u32 | | Firmware stores app app size here, so app can read its own size |
| `BLAKE2S` | r/w | r | 4B | u32 | | Function pointer to a BLAKE2S function in the firmware |