[Keyboard] Added support for ErgoDox with STM32 Microcontroller (#5398)

* Began Work On STM32 Ergodox
 Changes to be committed:
	new file:   keyboards/ergodox_stm32/config.h
	new file:   keyboards/ergodox_stm32/rules.mk

* test

* Now it compile. Not linking thou

* Screw this Linker. It links now!

* Blinkly Keyboard

* bootloader test code

* Working on matrix / i2c stuff

* Progress (LED Blink)

* Progress on MCP_23017 Status Flag

* [WIP]

* update

* Works! Remeber to change back the bootloader address when the new bootloadrer is ready.

* Time to go debug the i2c

* Finally, it now works with PCB Rev 1.0.2

* updated for rev.2 pcb

* minor compilation fix

* Why when debugger is enabled then everything works.

* Remeber to call init functions.

* Update arm i2c driver to support STM32F103 series device.

* fix include once header. Replaced with #pragma once.

* complication test

keyboards/ergodox_stm32/config.h

@@ -0,0 +1,35 @@
+/*
+Copyright 2019 Yaotian Feng(Codetector) <codetector@codetector.cn>
+
+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 2 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 <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#include "config_common.h"
+
+#define VENDOR_ID 0xFEED
+#define PRODUCT_ID 0x1308
+#define DEVICE_VER 0x101
+#define MANUFACTURER ErgoDox
+#define PRODUCT ErgoDox STM
+#define DESCRIPTION ErgoDox STM32 Keyboard
+
+#define MATRIX_ROWS 14
+#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2)
+#define MATRIX_COLS 6
+/* key combination for command */
+#define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KC_LCTL) | MOD_BIT(KC_RCTL)) || \
+    keyboard_report->mods == (MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT)) \
+)