91 lines
4.2 KiB
Markdown
91 lines
4.2 KiB
Markdown
# Converting a board to use the Proton C
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Since the Proton C is a drop-in replacement for a Pro Micro we've made it easy to use. This page documents a handy automated process for converting keyboards, as well as documenting the manual process if you'd like to make use of Proton C features that aren't available on Pro Micros.
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## Automatic Conversion
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If a board currently supported in QMK uses a Pro Micro (or compatible board) and you want to use the Proton C, you can generate the firmware by appending `CONVERT_TO_PROTON_C=yes` (or `CTPC=yes`) to your make argument, like this:
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make 40percentclub/mf68:default CTPC=yes
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You can add the same argument to your keymap's `rules.mk`, which will accomplish the same thing.
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This exposes the `CONVERT_TO_PROTON_C` flag that you can use in your code with `#ifdef`s, like this:
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```c
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#ifdef CONVERT_TO_PROTON_C
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// Proton C code
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#else
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// Pro Micro code
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#endif
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```
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If you get errors about `PORTB/DDRB`, etc not being defined, so you'll need to convert the keyboard's code to use the [GPIO Controls](internals_gpio_control.md) that will work for both ARM and AVR. This shouldn't affect the AVR builds at all.
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The Proton C only has one on-board LED (C13), and by default, the TXLED (D5) is mapped to it. If you want the RXLED (B0) mapped to it instead, add this like to your `config.h`:
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#define CONVERT_TO_PROTON_C_RXLED
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## Feature Conversion
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These are defaults based on what has been implemented for ARM boards.
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| Feature | Notes |
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|-------------------------------------|------------------------------------------------------------------------------------------------------------------|
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| [Audio](feature_audio.md) | Enabled |
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| [RGB Lighting](feature_rgblight.md) | Disabled |
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| [Backlight](feature_backlight.md) | Forces [task driven PWM](feature_backlight.md#software-pwm-driver) until ARM can provide automatic configuration |
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| USB Host (e.g. USB-USB converter) | Not supported (USB host code is AVR specific and is not currently supported on ARM) |
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| [Split keyboards](feature_split_keyboard.md) | Not supported yet |
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## Manual Conversion
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To use the Proton C natively, without having to specify `CTPC=yes`, you need to change the `MCU` line in `rules.mk`:
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```
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MCU = STM32F303
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```
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Remove these variables if they exist:
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* `BOOTLOADER`
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* `EXTRA_FLAGS`
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Finally convert all pin assignments in `config.h` to the stm32 equivalents.
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| Pro Micro Left | Proton C Left | | Proton C Right | Pro Micro Right |
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|-----------|----------|-|----------|-----------|
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| `D3` | `A9` | | 5v | RAW (5v) |
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| `D2` | `A10` | | GND | GND |
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| GND | GND | | FLASH | RESET |
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| GND | GND | | 3.3v | VCC <sup>1</sup> |
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| `D1` | `B7` | | `A2` | `F4` |
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| `D0` | `B6` | | `A1` | `F5` |
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| `D4` | `B5` | | `A0` | `F6` |
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| `C6` | `B4` | | `B8` | `F7` |
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| `D7` | `B3` | | `B13` | `B1` |
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| `E6` | `B2` | | `B14` | `B3` |
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| `B4` | `B1` | | `B15` | `B2` |
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| `B5` | `B0` | | `B9` | `B6` |
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| `B0` (RX LED) | `C13` <sup>2</sup> | | `C13` <sup>2</sup> | `D5` (TX LED) |
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You can also make use of several new pins on the extended portion of the Proton C:
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| Left | | Right |
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|------|-|-------|
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| `A4`<sup>3</sup> | | `B10` |
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| `A5`<sup>4</sup> | | `B11` |
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| `A6` | | `B12` |
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| `A7` | | `A14`<sup>5</sup> (SWCLK) |
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| `A8` | | `A13`<sup>5</sup> (SWDIO) |
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| `A15` | | RESET<sup>6</sup> |
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Notes:
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1. On a Pro Micro VCC can be 3.3v or 5v.
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2. A Proton C only has one onboard LED, not two like a Pro Micro. The Pro Micro has an RX LED on `D5` and a TX LED on `B0`.
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3. `A4` is shared with the speaker.
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4. `A5` is shared with the speaker.
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5. `A13` and `A14` are used for hardware debugging (SWD). You can also use them for GPIO, but should use them last.
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6. Short RESET to 3.3v (pull high) to reboot the MCU. This does not enter bootloader mode like a Pro Micro, it only resets the MCU.
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