[Keymap] Add oled improvements and cnano keymap for drashna (#16133)

keyboards/bastardkb/charybdis/3x5/keymaps/drashna/halconf.h

@@ -0,0 +1,26 @@
+/* Copyright 2020 Nick Brassel (tzarc)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#define HAL_USE_PWM     TRUE
+#define HAL_USE_SERIAL  TRUE
+#define HAL_USE_I2C     TRUE
+#define HAL_USE_SPI     TRUE
+#define SPI_USE_WAIT    TRUE
+#define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
+#define HAL_USE_GPT     TRUE
+
+#include_next <halconf.h>