Add Function level EECONFIG code for EEPROM (#3084)

* Add Function level EEPROM configuration

Add kb and user functions for EEPROM, and example of how to use it.

* Bug fixes and demo

* Additional cleanup

* Add EEPROM reset macro to example

* Forgot init function in list

* Move eeconfig_init_quantum function to quantum.c and actually set default layer

* See if removing weak quantum function fixes issue

* Fix travis compile error

* Remove ifdef blocks from EECONFIG so settings are always set

* Fix for ARM EEPROM updates

* Fix merge issues

* Fix potential STM32 EEPROM issues

2 files changed, 295 insertions, 0 deletions

diff --git a/keyboards/ergodox_ez/keymaps/rgb_layer/config.h b/keyboards/ergodox_ez/keymaps/rgb_layer/config.h
new file mode 100644
index 0000000000..59302b8003
--- /dev/null
+++ b/keyboards/ergodox_ez/keymaps/rgb_layer/config.h
@@ -0,0 +1,24 @@
+#ifndef KEYMAP_CONFIG_H
+#define KEYMAP_CONFIG_H
+
+
+    #define RGBLIGHT_SLEEP
+
+
+#ifndef QMK_KEYS_PER_SCAN
+#define QMK_KEYS_PER_SCAN 4
+#endif // !QMK_KEYS_PER_SCAN
+
+#define IGNORE_MOD_TAP_INTERRUPT
+#undef PERMISSIVE_HOLD
+#undef PREVENT_STUCK_MODIFIERS
+
+
+#define FORCE_NKRO
+
+#ifndef TAPPING_TOGGLE
+#define TAPPING_TOGGLE  1
+#endif
+
+#endif // !USERSPACE_CONFIG_H
+
diff --git a/keyboards/ergodox_ez/keymaps/rgb_layer/keymap.c b/keyboards/ergodox_ez/keymaps/rgb_layer/keymap.c
new file mode 100644
index 0000000000..384d7d0945
--- /dev/null
+++ b/keyboards/ergodox_ez/keymaps/rgb_layer/keymap.c
@@ -0,0 +1,271 @@
+#include QMK_KEYBOARD_H
+#include "version.h"
+
+#define BASE 0 // default layer
+#define SYMB 1 // symbols
+#define MDIA 2 // media keys
+
+enum custom_keycodes {
+  PLACEHOLDER = SAFE_RANGE, // can always be here
+  EPRM,
+  VRSN,
+  RGB_SLD,
+  RGB_LYR
+};
+
+typedef union {
+  uint32_t raw;
+  struct {
+    bool     rgb_layer_change :1;
+  };
+} user_config_t;
+
+user_config_t user_config;
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+/* Keymap 0: Basic layer
+ *
+ * ,--------------------------------------------------.           ,--------------------------------------------------.
+ * |   =    |   1  |   2  |   3  |   4  |   5  | LEFT |           | RIGHT|   6  |   7  |   8  |   9  |   0  |   -    |
+ * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
+ * | Del    |   Q  |   W  |   E  |   R  |   T  |  L1  |           |  L1  |   Y  |   U  |   I  |   O  |   P  |   \    |
+ * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
+ * | BkSp   |   A  |   S  |   D  |   F  |   G  |------|           |------|   H  |   J  |   K  |   L  |; / L2|' / Cmd |
+ * |--------+------+------+------+------+------| Hyper|           | Meh  |------+------+------+------+------+--------|
+ * | LShift |Z/Ctrl|   X  |   C  |   V  |   B  |      |           |      |   N  |   M  |   ,  |   .  |//Ctrl| RShift |
+ * `--------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
+ *   |Grv/L1|  '"  |AltShf| Left | Right|                                       |  Up  | Down |   [  |   ]  | ~L1  |
+ *   `----------------------------------'                                       `----------------------------------'
+ *                                        ,-------------.       ,-------------.
+ *                                        | App  | LGui |       | Alt  |Ctrl/Esc|
+ *                                 ,------|------|------|       |------+--------+------.
+ *                                 |      |      | Home |       | PgUp |        |      |
+ *                                 | Space|Backsp|------|       |------|  Tab   |Enter |
+ *                                 |      |ace   | End  |       | PgDn |        |      |
+ *                                 `--------------------'       `----------------------'
+ */
+// If it accepts an argument (i.e, is a function), it doesn't need KC_.
+// Otherwise, it needs KC_*
+[BASE] = LAYOUT_ergodox(  // layer 0 : default
+        // left hand
+        KC_EQL,         KC_1,         KC_2,   KC_3,   KC_4,   KC_5,   KC_LEFT,
+        KC_DELT,        KC_Q,         KC_W,   KC_E,   KC_R,   KC_T,   TG(SYMB),
+        KC_BSPC,        KC_A,         KC_S,   KC_D,   KC_F,   KC_G,
+        KC_LSFT,        CTL_T(KC_Z),  KC_X,   KC_C,   KC_V,   KC_B,   ALL_T(KC_NO),
+        LT(SYMB,KC_GRV),KC_QUOT,      LALT(KC_LSFT),  KC_LEFT,KC_RGHT,
+                                              ALT_T(KC_APP),  KC_LGUI,
+                                                              KC_HOME,
+                                               KC_SPC,KC_BSPC,KC_END,
+        // right hand
+             KC_RGHT,     KC_6,   KC_7,  KC_8,   KC_9,   KC_0,             KC_MINS,
+             TG(SYMB),    KC_Y,   KC_U,  KC_I,   KC_O,   KC_P,             KC_BSLS,
+                          KC_H,   KC_J,  KC_K,   KC_L,   LT(MDIA, KC_SCLN),GUI_T(KC_QUOT),
+             MEH_T(KC_NO),KC_N,   KC_M,  KC_COMM,KC_DOT, CTL_T(KC_SLSH),   KC_RSFT,
+                                  KC_UP, KC_DOWN,KC_LBRC,KC_RBRC,          TT(SYMB),
+             KC_LALT,        CTL_T(KC_ESC),
+             KC_PGUP,
+             KC_PGDN,KC_TAB, KC_ENT
+    ),
+/* Keymap 1: Symbol Layer
+ *
+ * ,---------------------------------------------------.           ,--------------------------------------------------.
+ * |Version  |  F1  |  F2  |  F3  |  F4  |  F5  |      |           |      |  F6  |  F7  |  F8  |  F9  |  F10 |   F11  |
+ * |---------+------+------+------+------+------+------|           |------+------+------+------+------+------+--------|
+ * |         |   !  |   @  |   {  |   }  |   |  |      |           |      |   Up |   7  |   8  |   9  |   *  |   F12  |
+ * |---------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
+ * |         |   #  |   $  |   (  |   )  |   `  |------|           |------| Down |   4  |   5  |   6  |   +  |        |
+ * |---------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
+ * |         |   %  |   ^  |   [  |   ]  |   ~  |      |           |      |   &  |   1  |   2  |   3  |   \  |        |
+ * `---------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
+ *   | EPRM  |      |      |      |      |                                       |      |    . |   0  |   =  |      |
+ *   `-----------------------------------'                                       `----------------------------------'
+ *                                        ,-------------.       ,-------------.
+ *                                        |Animat| LYR  |       |Toggle|Solid |
+ *                                 ,------|------|------|       |------+------+------.
+ *                                 |Bright|Bright|      |       |      |Hue-  |Hue+  |
+ *                                 |ness- |ness+ |------|       |------|      |      |
+ *                                 |      |      |      |       |      |      |      |
+ *                                 `--------------------'       `--------------------'
+ */
+// SYMBOLS
+[SYMB] = LAYOUT_ergodox(
+       // left hand
+       VRSN,   KC_F1,  KC_F2,  KC_F3,  KC_F4,  KC_F5,  KC_TRNS,
+       RESET,  KC_EXLM,KC_AT,  KC_LCBR,KC_RCBR,KC_PIPE,KC_TRNS,
+       KC_TRNS,KC_HASH,KC_DLR, KC_LPRN,KC_RPRN,KC_GRV,
+       EPRM,KC_PERC,KC_CIRC,KC_LBRC,KC_RBRC,KC_TILD,KC_TRNS,
+          KC_TRNS,KC_TRNS,KC_TRNS,KC_TRNS,KC_TRNS,
+                                       RGB_MOD,RGB_LYR,
+                                               KC_TRNS,
+                               RGB_VAD,RGB_VAI,KC_TRNS,
+       // right hand
+       KC_TRNS, KC_F6,   KC_F7,  KC_F8,   KC_F9,   KC_F10,  KC_F11,
+       KC_TRNS, KC_UP,   KC_7,   KC_8,    KC_9,    KC_ASTR, KC_F12,
+                KC_DOWN, KC_4,   KC_5,    KC_6,    KC_PLUS, KC_TRNS,
+       KC_TRNS, KC_AMPR, KC_1,   KC_2,    KC_3,    KC_BSLS, KC_TRNS,
+                         KC_TRNS,KC_DOT,  KC_0,    KC_EQL,  KC_TRNS,
+       RGB_TOG, RGB_SLD,
+       KC_TRNS,
+       KC_TRNS, RGB_HUD, RGB_HUI
+),
+/* Keymap 2: Media and mouse keys
+ *
+ * ,--------------------------------------------------.           ,--------------------------------------------------.
+ * |        |      |      |      |      |      |      |           |      |      |      |      |      |      |        |
+ * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
+ * |        |      |      | MsUp |      |      |      |           |      |      |      |      |      |      |        |
+ * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
+ * |        |      |MsLeft|MsDown|MsRght|      |------|           |------|      |      |      |      |      |  Play  |
+ * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
+ * |        |      |      |      |      |      |      |           |      |      |      | Prev | Next |      |        |
+ * `--------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
+ *   |      |      |      | Lclk | Rclk |                                       |VolUp |VolDn | Mute |      |      |
+ *   `----------------------------------'                                       `----------------------------------'
+ *                                        ,-------------.       ,-------------.
+ *                                        |      |      |       |      |      |
+ *                                 ,------|------|------|       |------+------+------.
+ *                                 |      |      |      |       |      |      |Brwser|
+ *                                 |      |      |------|       |------|      |Back  |
+ *                                 |      |      |      |       |      |      |      |
+ *                                 `--------------------'       `--------------------'
+ */
+// MEDIA AND MOUSE
+[MDIA] = LAYOUT_ergodox(
+       KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+       KC_TRNS, KC_TRNS, KC_TRNS, KC_MS_U, KC_TRNS, KC_TRNS, KC_TRNS,
+       KC_TRNS, KC_TRNS, KC_MS_L, KC_MS_D, KC_MS_R, KC_TRNS,
+       KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+       KC_TRNS, KC_TRNS, KC_TRNS, KC_BTN1, KC_BTN2,
+                                           KC_TRNS, KC_TRNS,
+                                                    KC_TRNS,
+                                  KC_TRNS, KC_TRNS, KC_TRNS,
+    // right hand
+       KC_TRNS,  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+       KC_TRNS,  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPLY,
+       KC_TRNS,  KC_TRNS, KC_TRNS, KC_MPRV, KC_MNXT, KC_TRNS, KC_TRNS,
+                          KC_VOLU, KC_VOLD, KC_MUTE, KC_TRNS, KC_TRNS,
+       KC_TRNS, KC_TRNS,
+       KC_TRNS,
+       KC_TRNS, KC_TRNS, KC_WBAK
+),
+};
+
+void eeconfig_init_user(void) {
+  rgblight_enable();
+  rgblight_sethsv_cyan();
+  rgblight_mode(1);
+  user_config.rgb_layer_change = true;
+  eeconfig_update_user(user_config.raw);
+}
+
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    // dynamically generate these.
+    case EPRM:
+      if (record->event.pressed) {
+        eeconfig_init();
+      }
+      return false;
+      break;
+    case VRSN:
+      if (record->event.pressed) {
+        SEND_STRING (QMK_KEYBOARD "/" QMK_KEYMAP " @ " QMK_VERSION);
+      }
+      return false;
+      break;
+    case RGB_SLD:
+      if (record->event.pressed) {
+        #ifdef RGBLIGHT_ENABLE
+          rgblight_mode(1);
+        #endif
+      }
+      return false;
+      break;
+     case RGB_LYR:  // This allows me to use underglow as layer indication, or as normal
+        if (record->event.pressed) {
+            user_config.rgb_layer_change ^= 1; // Toggles the status
+            eeconfig_update_user(user_config.raw); // Writes the new status to EEPROM
+            if (user_config.rgb_layer_change) { // if layer state indication is enabled,
+                layer_state_set(layer_state);   // then immediately update the layer color
+            }
+        }
+        return false; break;
+    case RGB_MODE_FORWARD ... RGB_MODE_GRADIENT: // For any of the RGB codes (see quantum_keycodes.h, L400 for reference)
+        if (record->event.pressed) { //This disables layer indication, as it's assumed that if you're changing this ... you want that disabled
+            if (user_config.rgb_layer_change) {        // only if this is enabled
+                user_config.rgb_layer_change = false;  // disable it, and
+                eeconfig_update_user(user_config.raw); // write the setings to EEPROM
+            }
+        }
+        return true; break;
+ }
+  return true;
+}
+
+void matrix_init_user(void) {
+  // Call the keymap level matrix init.
+
+  // Read the user config from EEPROM
+  user_config.raw = eeconfig_read_user();
+
+  // Set default layer, if enabled
+  if (user_config.rgb_layer_change) {
+    rgblight_enable_noeeprom();
+    rgblight_sethsv_noeeprom_cyan();
+    rgblight_mode_noeeprom(1);
+  }
+}
+
+// Runs constantly in the background, in a loop.
+void matrix_scan_user(void) {
+
+};
+
+uint32_t layer_state_set_user(uint32_t state) {
+  ergodox_board_led_off();
+  ergodox_right_led_1_off();
+  ergodox_right_led_2_off();
+  ergodox_right_led_3_off();
+  switch (biton32(state)) {
+    case SYMB:
+        ergodox_right_led_1_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_red(); rgblight_mode_noeeprom(1); }
+        break;
+    case MDIA:
+        ergodox_right_led_2_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_green(); rgblight_mode_noeeprom(1); }
+        break;
+    case 3:
+        ergodox_right_led_3_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_blue(); rgblight_mode_noeeprom(1); }
+        break;
+    case 4:
+        ergodox_right_led_1_on();
+        ergodox_right_led_2_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_orange(); rgblight_mode_noeeprom(1); }
+        break;
+    case 5:
+        ergodox_right_led_1_on();
+        ergodox_right_led_3_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_yellow(); rgblight_mode_noeeprom(1); }
+        break;
+    case 6:
+        ergodox_right_led_2_on();
+        ergodox_right_led_3_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_pink(); rgblight_mode_noeeprom(1); }
+        break;
+    case 7:
+        ergodox_right_led_1_on();
+        ergodox_right_led_2_on();
+        ergodox_right_led_3_on();
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_white(); rgblight_mode_noeeprom(1); }
+        break;
+    default: //  for any other layers, or the default layer
+        if (user_config.rgb_layer_change) { rgblight_sethsv_noeeprom_cyan(); rgblight_mode_noeeprom(1); }
+        break;
+    }
+  return state;
+}
+