1 files changed, 97 insertions, 0 deletions
diff --git a/quantum/dynamic_keymap.c b/quantum/dynamic_keymap.c
new file mode 100644
index 000000000..9f18612d5
--- /dev/null
+++ b/quantum/dynamic_keymap.c
@@ -0,0 +1,97 @@
+/* Copyright 2017 Jason Williams (Wilba)
+ *
+ * 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/>.
+ */
+
+#include "config.h"
+#include "keymap.h" // to get keymaps[][][]
+
+#include "dynamic_keymap.h"
+
+#ifdef DYNAMIC_KEYMAP_ENABLE
+
+#ifndef DYNAMIC_KEYMAP_EEPROM_ADDR
+#error DYNAMIC_KEYMAP_EEPROM_ADDR not defined
+#endif
+
+#ifndef DYNAMIC_KEYMAP_LAYER_COUNT
+#error DYNAMIC_KEYMAP_LAYER_COUNT not defined
+#endif
+
+#define KC_EENULL 0xFFFF // TODO: move to enum quantum_keycodes
+
+void *dynamic_keymap_key_to_eeprom_address(uint8_t layer, uint8_t row, uint8_t column)
+{
+	// TODO: optimize this with some left shifts
+	return ((void*)DYNAMIC_KEYMAP_EEPROM_ADDR) + ( layer * MATRIX_ROWS * MATRIX_COLS * 2 ) +
+		( row * MATRIX_COLS * 2 ) + ( column * 2 );
+}
+
+uint16_t dynamic_keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t column)
+{
+	void *address = dynamic_keymap_key_to_eeprom_address(layer, row, column);
+	// Big endian, so we can read/write EEPROM directly from host if we want
+	uint16_t keycode = eeprom_read_byte(address) << 8;
+	keycode |= eeprom_read_byte(address + 1);
+	return keycode;
+}
+
+void dynamic_keymap_set_keycode(uint8_t layer, uint8_t row, uint8_t column, uint16_t keycode)
+{
+	void *address = dynamic_keymap_key_to_eeprom_address(layer, row, column);
+	// Big endian, so we can read/write EEPROM directly from host if we want
+	eeprom_update_byte(address, (uint8_t)(keycode >> 8));
+	eeprom_update_byte(address+1, (uint8_t)(keycode & 0xFF));
+}
+
+void dynamic_keymap_clear_all(void)
+{
+	// Save "empty" keymaps.
+	for ( int layer = 0; layer < DYNAMIC_KEYMAP_LAYER_COUNT; layer++ )
+	{
+		for ( int row = 0; row < MATRIX_ROWS; row++ )
+		{
+			for ( int column = 0; column < MATRIX_COLS; column++ )
+			{
+				dynamic_keymap_set_keycode(layer, row, column, KC_EENULL);
+			}
+		}
+	}
+}
+
+// This overrides the one in quantum/keymap_common.c
+uint16_t keymap_key_to_keycode(uint8_t layer, keypos_t key)
+{
+	// This used to test EEPROM for magic bytes, but it was redundant.
+	// Test for EEPROM usage change (fresh install, address change, etc.)
+	// externally and call dynamic_keymap_default_save()
+	if ( layer < DYNAMIC_KEYMAP_LAYER_COUNT &&
+		 key.row < MATRIX_ROWS && // possibly redundant
+		 key.col < MATRIX_COLS ) // possibly redundant
+	{
+		uint16_t keycode = dynamic_keymap_get_keycode(layer, key.row, key.col);
+
+		// If keycode is not "empty", return it, otherwise
+		// drop down to return the one in flash
+		if ( keycode != KC_EENULL)
+		{
+			return keycode;
+		}
+	}
+
+	return pgm_read_word(&keymaps[layer][key.row][key.col]);
+}
+
+#endif // DYNAMIC_KEYMAP_ENABLE
+