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docs: Move Mega 2560 information to separate file

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Make a more comprehensive document describing the Mega 2560 and FPC
breakout board.
This commit is contained in:
Tim Crawford
2020-08-07 15:51:47 -06:00
committed by Jeremy Soller
parent babcc970c4
commit 2414476a66
2 changed files with 79 additions and 22 deletions
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29
doc/debugging.md
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@ -13,27 +13,12 @@ external USB keyboard or SSH session.
Requirements:
- Arduino Mega 2560 compatible board
- 24 pin flexible printed circuit
- 24 pin FPC breakout board and cables
- 0.5mm or 1.0mm pitch, depending on target connector
- 24 pin FPC breakout board with connectors
- USB-C cable
### Configuring the Mega 2560
If the breakout board did not come preassembled, assemble it before
starting. This will require soldering.
1. Connect the breakout board to the Mega 2560
- Orientation will affect the mapping of GPIO pins
2. Connect the Mega 2560 to the host
3. Configure GPIO pin mapping in `parallel.c` based on how it will
connect to the target parallel port
- Trace pin 1 on motherboard connector to Mega's GPIO pins
4. Build and flash the firmware for the Mega 2560
```
make BOARD=arduino/mega2560
make BOARD=arduino/mega2560 flash
```
For details on configuring the Mega 2560 and breakout board, see
[mega2560](./mega2560.md).
### Setup
@ -44,10 +29,10 @@ make BOARD=arduino/mega2560 flash
3. Remove bottom panel
4. Unplug keyboard cable
- May require removing keyboard depending on port location
5. Connect Mega 2560 to host
- This will create an ACM device at `/dev/ttyACM*`
6. Ground target to host
5. Ground target to host
- Connect USB cable from USB-C port on target to host
6. Connect Mega 2560 to host
- This will create an ACM device at `/dev/ttyACM*`
7. Connect Mega 2560 to target
8. Start the console
```
@ -57,7 +42,7 @@ make BOARD=system76/<model> console_external
EC logs should now print to the console on the host. This can be tested
by removing or inserting the AC adapter to trigger a power event.
To return the Mega to host mode, reset the device.
To return the Mega 2560 to host mode, reset the device.
If logs are corrupted, try power cycling the Mega or reseating the cable.