bastardkb/charybdis: add support for Charybdis (4x6 and 3x5) (#15333)

keyboards/bastardkb/charybdis/4x6/rules.mk

@@ -0,0 +1,37 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+AUDIO_SUPPORTED = no        # Audio is not supported.
+RGB_MATRIX_SUPPORTED = yes  # RGB matrix is supported and enabled by default.
+RGBLIGHT_SUPPORTED = yes    # RGB underglow is supported, but not enabled by default.
+RGB_MATRIX_ENABLE = yes     # Enable keyboard RGB matrix functionality
+RGB_MATRIX_DRIVER = WS2812
+
+# Enable link-time optimization by default.  The Charybdis packs a lot of
+# features (RGB, Via, trackball) in a small atmega32u4 package.
+LTO_ENABLE = yes
+
+# Charybdis is a split 4x6 keyboard with a maximum of 5 thumb keys (3 on the
+# trackball side).
+SPLIT_KEYBOARD = yes
+
+POINTING_DEVICE_ENABLE = yes # Enable trackball
+POINTING_DEVICE_DRIVER = pmw3360
+# https://qmk.fm/changes/2018-11-16-use-a-single-endpoint-for-hid-reports
+MOUSE_SHARED_EP = no # Unify multiple HID interfaces into a single Endpoint