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[Core] Add Raspberry Pi RP2040 support (#14877)

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* Disable RESET keycode because of naming conflicts

* Add Pico SDK as submodule

* Add RP2040 build support to QMK

* Adjust USB endpoint structs for RP2040

* Add RP2040 bootloader and double-tap reset routine

* Add generic and pro micro RP2040 boards

* Add RP2040 onekey keyboard

* Add WS2812 PIO DMA enabled driver and documentation

Supports regular and open-drain output configuration. RP2040 GPIOs are
sadly not 5V tolerant, so this is a bit use-less or needs extra hardware
or you take the risk to fry your hardware.

* Adjust SIO Driver for RP2040

* Adjust I2C Driver for RP2040

* Adjust SPI Driver for RP2040

* Add PIO serial driver and documentation

* Add general RP2040 documentation

* Apply suggestions from code review

Co-authored-by: Nick Brassel <nick@tzarc.org>

Co-authored-by: Nick Brassel <nick@tzarc.org>
This commit is contained in:
Stefan Kerkmann 2022-06-30 13:19:27 +02:00 • committed by GitHub
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commit d717396708
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docs/flashing.md
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@ -362,3 +362,42 @@ CLI Flashing sequence:
### `make` Targets
* `:uf2-split-left` and `:uf2-split-right`: Flashes the firmware but also sets the handedness setting in EEPROM by generating a side specific firmware.
## Raspberry Pi RP2040 UF2
The `rules.mk` setting for this bootloader is `rp2040`, and can be specified at the keymap or user level.
To ensure compatibility with the rp2040 bootloader, make sure this block is present in your `rules.mk`:
```make
# Bootloader selection
BOOTLOADER = rp2040
```
Compatible flashers:
* Any application able to copy a file from one place to another, such as _macOS Finder_ or _Windows Explorer_.
Flashing sequence:
1. Enter the bootloader using any of the following methods:
* Tap the `QK_BOOTLOADER` keycode
* Hold the `BOOTSEL` button on the PCB while plugin in the usb cable.
* Double-tap the `RESET` button on the PCB<sup>1</sup>.
2. Wait for the OS to detect the device
3. Copy the .uf2 file to the new USB disk
4. Wait for the keyboard to become available
or
CLI Flashing sequence:
1. Enter the bootloader using any of the following methods:
* Tap the `QK_BOOTLOADER` keycode
* Hold the `BOOTSEL` button on the PCB while plugin in the usb cable.
* Double-tap the `RESET` button on the PCB<sup>1</sup>.
2. Wait for the OS to detect the device
3. Flash via QMK CLI eg. `qmk flash --keyboard handwired/onekey/rpi_pico --keymap default`
4. Wait for the keyboard to become available
<sup>1</sup>: This works only if QMK was compiled with `RP2040_BOOTLOADER_DOUBLE_TAP_RESET` defined.