converter: Add Pro micro to Halcyon adapter and remove Imera

docs/feature_converters.md

@@ -33,9 +33,9 @@ The following converters are available at this time:
 | `promicro` | `elite_pi`        |
 | `promicro` | `helios`          |
 | `promicro` | `liatris`         |
-| `promicro` | `imera`           |
 | `promicro` | `michi`           |
 | `promicro` | `svlinky`         |
+| `promicro` | `halcyon`         |
 | `elite_c`  | `stemcell`        |
 | `elite_c`  | `rp2040_ce`       |
 | `elite_c`  | `elite_pi`        |
@@ -89,9 +89,9 @@ If a board currently supported by QMK uses a [Pro Micro](https://www.sparkfun.co
 | [Elite-Pi](https://keeb.io/products/elite-pi-usb-c-pro-micro-replacement-rp2040)         | `elite_pi`        | `-e CONVERT_TO=elite_pi`        | `CONVERT_TO=elite_pi`        | `#ifdef CONVERT_TO_ELITE_PI`        |
 | [0xCB Helios](https://keeb.supply/products/0xcb-helios)                                  | `helios`          | `-e CONVERT_TO=helios`          | `CONVERT_TO=helios`          | `#ifdef CONVERT_TO_HELIOS`          |
 | [Liatris](https://splitkb.com/products/liatris)                                          | `liatris`         | `-e CONVERT_TO=liatris`         | `CONVERT_TO=liatris`         | `#ifdef CONVERT_TO_LIATRIS`         |
-| [Imera](https://splitkb.com/products/imera)                                              | `imera`           | `-e CONVERT_TO=imera`           | `CONVERT_TO=imera`           | `#ifdef CONVERT_TO_IMERA`           |
 | [Michi](https://github.com/ci-bus/michi-promicro-rp2040)                                 | `michi`           | `-e CONVERT_TO=michi`           | `CONVERT_TO=michi`           | `#ifdef CONVERT_TO_MICHI`           |
 | [Svlinky](https://github.com/sadekbaroudi/svlinky)                                       | `svlinky`         | `-e CONVERT_TO=svlinky`         | `CONVERT_TO=svlinky`         | `#ifdef CONVERT_TO_SVLINKY`         |
+| [Halcyon Adapter](https://splitkb.com/products/halcyon-adapter)                          | `halcyon`         | `-e CONVERT_TO=halcyon`         | `CONVERT_TO=halcyon`         | `#ifdef CONVERT_TO_HALCYON`         |
 
 ### Proton C {#proton_c}
 
@@ -161,6 +161,10 @@ Feature set is identical to [Adafruit KB2040](#kb2040). VBUS detection is enable
 
 Feature set is a pro micro equivalent of the [RP2040 Community Edition](#rp2040_ce), except that two of the analog GPIO have been replaced with digital only GPIO. These two were moved to the FPC connector to support the [VIK specification](https://github.com/sadekbaroudi/vik). This means that if you are expecting analog support on all 4 pins as provided on a RP2040 Community Edition pinout, you will not have that. Please see the [Svlinky github page](https://github.com/sadekbaroudi/svlinky) for more details.
 
+### Halcyon Adapter {#halcyon}
+
+Feature set is a pro micro adapter for Halcyon controllers from Splitkb.com. This allows you to use a wired Halcyon controller on any keyboard which has support for a pro micro microcontroller. The adapter board has a FPC connector to support the [VIK specification](https://github.com/sadekbaroudi/vik). Please see the [Splitkb.com product page](https://splitkb.com/products/halcyon-adapter) for more details.
+
 ## Elite-C Converters
 
 If a board currently supported by QMK uses an [Elite-C](https://keeb.io/products/elite-c-low-profile-version-usb-c-pro-micro-replacement-atmega32u4), the supported alternative controllers are:

platforms/chibios/converters/promicro_to_halcyon/_pin_defs.h

@@ -0,0 +1,36 @@
+// Copyright 2026 splitkb.com
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+// Left side (front)
+#define D3 3U
+#define D2 29U
+//      GND
+//      GND
+#define D1 25U
+#define D0 10U
+#define D4 19U
+#define C6 24U
+#define D7 23U
+#define E6 22U
+#define B4 18U
+#define B5 21U
+
+// Right side (front)
+//      RAW
+//      GND
+//      RESET
+//      VCC
+#define F4 4U
+#define F5 9U
+#define F6 10U
+#define F7 5U
+#define B1 6U
+#define B3 7U
+#define B2 11U
+#define B6 8U
+
+// LEDs
+#define D5 0U // Unconnected
+#define B0 2U // Unconnected

platforms/chibios/converters/promicro_to_imera/converter.mk → platforms/chibios/converters/promicro_to_halcyon/converter.mk

@@ -7,4 +7,4 @@ BOOTLOADER := rp2040
 SERIAL_DRIVER ?= vendor
 WS2812_DRIVER ?= vendor
 BACKLIGHT_DRIVER ?= software
-OPT_DEFS += -DUSB_VBUS_PIN=19U
+OPT_DEFS += -DUSB_VBUS_PIN=1U