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Maxim Devaev 2023-08-11 03:44:25 +03:00
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docs/pico_hid.md
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@ -54,7 +54,7 @@ For most cases, nothing needs to be changed here. However, if you need something
To achieve this, the Pico HID uses a runtime configuration, which is set by connecting
some GPIOs with Ground (`GND`) lines.
| Pin name | Description |
| Pin name on the Pico board | Description |
|----------|-------------|
| `GP2` | Enable PS/2 keyboard & mouse support (see below). |
| `GP3` | Prefer the PS/2 keyboard over USB when turning on the HID (if PS/2 enabled). |
@ -115,3 +115,42 @@ If you are making the Pico HID for V2 or V3, add the following lines to the PiKV
power_detect_pin: 16
power_detect_pull_down: true
```
-----
## Arduino HID replacement
!!! note
This section is intended for advanced users
The Pico HID can be used to replace the [Arduino HID](arduino_hid.md) in legacy DIY PiKVM V0 builds.
Moreover, it can use both Serial (UART) port and SPI. The connection scheme is also noticeably simplified,
getting rid of the transistor for the Reset line and level shifter for RX/TX (MOSI/MISO).
* **For Arduino HID over SPI**: Throw away the Reset transistor and level shifter, and follow this guide
from the very beginning, as if you were connecting Pico HID for V2/V3.
* **For the classic Serial (UART) HID**: Get rid of the transistor and level shifter, and follow this guide
from the very beginning, but the schemes and configs will be slightly different.
* The `GP22` on the Pico is connected directly to the `GND`. This enables UART mode instead of default SPI.
* In the original V0, `GPIO4` on the Raspberry Pi was used for the Reset line. Now we recommend using `GPIO25`
for consistency reasons. However, you can use `GPIO4` by changing the `reset_pin` value in the config example below.
On the scheme, this is a yellow wire, the `RUN (Pico) -> GPIO25 (Pi)` line.
??? example "Configs"
* Don't add line `dtoverlay=spi0-1cs` to the `/boot/config.txt` file. It's only needed for SPI.
* `/etc/kvmd/override.yaml`:
```yaml
kvmd:
hid:
type: serial
device: /dev/kvmd-hid
reset_pin: 25
reset_inverted: true
reset_self: true
power_detect_pin: 16
power_detect_pull_down: true
```