Add Satisfaction75 to QMK, Enable EEPROM on stm32f072 (#5094)

* Add stm32f072 base ck4x4 to handwired

* add prints

* Save these tries

* Save changes again

* Working hadron oled

* OLEd working but ws2812b still iffy:

* save another try

* Encoder feature + OLED

* RTC code

* Implement clock setting mode

* Whitespace

* Encoder hooked up to working LED PWM code

* Add missing files

* eeprom changes

* Save changes

* Move i2c master

* Move satisfaction75 under cannonkeys

* Set proper default folder

* Revert some core changes

* Undo paved iris changes

* Reorganize code for maintainability and prep for new features

* Add starting code for clock OLED mode

* Clock set mode finished

* Add custom encoder modes

* Actually add VIA keymap

* Gate to only 072

* fix gate for only 072

* Update header guards and includes

* Update i2c selection strategy

* Update board.c to handle software reset to DFU

keyboards/handwired/ck4x4/config.h

@@ -0,0 +1,70 @@
+/*
+Copyright 2015 Jun Wako <wakojun@gmail.com>
+
+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
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6464
+#define DEVICE_VER      0x0001
+/* in python2: list(u"whatever".encode('utf-16-le')) */
+/*   at most 32 characters or the ugly hack in usb_main.c borks */
+#define MANUFACTURER QMK
+#define PRODUCT CK4x4
+#define DESCRIPTION Cannon Keys 4x4 MacroPad
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 4
+
+#define MATRIX_COL_PINS { B7, B8, B9, B10 }
+#define MATRIX_ROW_PINS { B3, B4, B5, B6 }
+#define DIODE_DIRECTION COL2ROW
+
+//LEDS A6, RGB B15
+
+/* define if matrix has ghost */
+//#define MATRIX_HAS_GHOST
+
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCE    5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+//#define NO_ACTION_MACRO
+//#define NO_ACTION_FUNCTION
+