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# Converters
Since many drop-in replacement controllers now exist, we've done our best to make them easy to use in existing designs.
This page documents the handy automated process for converting keyboards.
### Supported Converters
Currently the following converters are available:
| From | To |
|------------|-------------------|
| `promicro` | `proton_c` |
| `promicro` | `kb2040` |
| `promicro` | `promicro_rp2040` |
See below for more in depth information on each converter.
## Overview
Each converter category is broken down by its declared `pin compatibility`.
This ensures that only valid combinations are attempted.
You can generate the firmware by appending `-e CONVERT_TO=<target>` to your compile/flash command. For example:
```sh
qmk flash -c -kb keebio/bdn9/rev1 -km default -e CONVERT_TO=proton_c
```
You can also add the same `CONVERT_TO=<target>` to your keymap's `rules.mk`, which will accomplish the same thing.
?> 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](gpio_control.md) that will work for both ARM and AVR. This shouldn't affect the AVR builds at all.
### Conditional Configuration
Once a converter is enabled, it exposes the `CONVERT_TO_<target_uppercase>` flag that you can use in your code with `#ifdef`s, For example:
```c
#ifdef CONVERT_TO_PROTON_C
// Proton C code
#else
// Pro Micro code
#endif
```
## Pro Micro
If a board currently supported in QMK uses a [Pro Micro](https://www.sparkfun.com/products/12640) (or compatible board), the supported alternative controllers are:
| Device | Target |
|------------------------------------------------------------------------|-------------------|
| [Proton C](https://qmk.fm/proton-c/) | `proton_c` |
| [Adafruit KB2040](https://learn.adafruit.com/adafruit-kb2040) | `kb2040` |
| [SparkFun Pro Micro - RP2040](https://www.sparkfun.com/products/18288) | `promicro_rp2040` |
Converter summary:
| Target | Argument | `rules.mk` | Condition |
|-------------------|---------------------------------|------------------------------|-------------------------------------|
| `proton_c` | `-e CONVERT_TO=proton_c` | `CONVERT_TO=proton_c` | `#ifdef CONVERT_TO_PROTON_C` |
| `kb2040` | `-e CONVERT_TO=kb2040` | `CONVERT_TO=kb2040` | `#ifdef CONVERT_TO_KB2040` |
| `promicro_rp2040` | `-e CONVERT_TO=promicro_rp2040` | `CONVERT_TO=promicro_rp2040` | `#ifdef CONVERT_TO_PROMICRO_RP2040` |
### Proton C :id=proton_c
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`:
```c
#define CONVERT_TO_PROTON_C_RXLED
```
The following defaults are based on what has been implemented for STM32 boards.
| Feature | Notes |
|----------------------------------------------|------------------------------------------------------------------------------------------------------------------|
| [Audio](feature_audio.md) | Enabled |
| [RGB Lighting](feature_rgblight.md) | Disabled |
| [Backlight](feature_backlight.md) | Forces [task driven PWM](feature_backlight.md#software-pwm-driver) until ARM can provide automatic configuration |
| USB Host (e.g. USB-USB converter) | Not supported (USB host code is AVR specific and is not currently supported on ARM) |
| [Split keyboards](feature_split_keyboard.md) | Partial - heavily dependent on enabled features |
### Adafruit KB2040 :id=kb2040
The following defaults are based on what has been implemented for [RP2040](platformdev_rp2040.md) boards.
| Feature | Notes |
|----------------------------------------------|------------------------------------------------------------------------------------------------------------------|
| [RGB Lighting](feature_rgblight.md) | Enabled via `PIO` vendor driver |
| [Backlight](feature_backlight.md) | Forces [task driven PWM](feature_backlight.md#software-pwm-driver) until ARM can provide automatic configuration |
| USB Host (e.g. USB-USB converter) | Not supported (USB host code is AVR specific and is not currently supported on ARM) |
| [Split keyboards](feature_split_keyboard.md) | Partial via `PIO` vendor driver - heavily dependent on enabled features |
### SparkFun Pro Micro - RP2040 :id=promicro_rp2040
Currently identical to [Adafruit KB2040](#kb2040).
|
