[Keyboard] id80: Transpose matrix to use faster COL2ROW routines (#8930)

* id80: Transpose matrix to use faster COL2ROW routines

Even the standard QMK matrix_scan() function can give about 2 times
higher scan rate (if compiled with optimizations enabled) if the COL2ROW
matrix layout is used instead of ROW2COL.  Although the ID80 PCB is
wired using the ROW2COL matrix layout, it is possible to transpose the
matrix from the QMK standpoint, so that "columns" would correspond to
horizontal connections, and "rows" would correspond to (mostly) vertical
connections; in this case the matrix could be handled as if it had the
COL2ROW layout.

The matrix layout change makes the older VIA JSON layout definition
incompatible, but the corresponding JSON was not yet accepted to the VIA
repository, so it should still be safe to make this change.

* id80: Remove obsolete comments

1 files changed, 17 insertions, 11 deletions

diff --git a/keyboards/id80/config.h b/keyboards/id80/config.h
index 12ee5400c..936fd5b2e 100644
--- a/keyboards/id80/config.h
+++ b/keyboards/id80/config.h
@@ -28,8 +28,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define DESCRIPTION     A 75% hotswap keyboard
 
 /* key matrix size */
-#define MATRIX_ROWS 11
-#define MATRIX_COLS 9
+#define MATRIX_ROWS 9
+#define MATRIX_COLS 11
 
 /*
  * Keyboard Matrix Assignments
@@ -41,16 +41,25 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
  *
  * The matrix description in the vendor-supplied JSON file for kbfirmware.com
- * had 12 rows:
+ * had 9 columns:
+ *     { D0, D1, D2, D3, D5, D4, D6, D7, B4 }
+ * and 12 rows:
  *     { B7, B3, B2, B1, B0, E6, F0, F1, F4, F5, F6, F7 }
  * However, the row 6 was completely empty, and the pin F0 was not actually
  * routed anywhere on the PCB, therefore this row was removed to save some
  * resources (the EEPROM space for dynamic keymaps is especially scarce).
+ *
+ * After doing the above change, the matrix was transposed (rows and columns
+ * were swapped), because a matrix with the COL2ROW layout can be scanned much
+ * more efficiently than a matrix with the ROW2COL layout (depending on various
+ * optimizations, the difference in scan rate can be over 2 times).  Because of
+ * this, the "columns" in the matrix layout now mostly correspond to physical
+ * rows, and the "rows" have mostly vertical physical orientation.
  */
-#define MATRIX_ROW_PINS { B7, B3, B2, B1, B0, E6, F1, F4, F5, F6, F7 }
-#define MATRIX_COL_PINS { D0, D1, D2, D3, D5, D4, D6, D7, B4 }
+#define MATRIX_ROW_PINS { D0, D1, D2, D3, D5, D4, D6, D7, B4 }
+#define MATRIX_COL_PINS { B7, B3, B2, B1, B0, E6, F1, F4, F5, F6, F7 }
 
-#define DIODE_DIRECTION ROW2COL
+#define DIODE_DIRECTION COL2ROW
 
 #define BACKLIGHT_PIN B6
 // #define BACKLIGHT_BREATHING
@@ -81,8 +90,5 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #endif
 
 /* Bootmagic Lite key configuration: use the Esc key */
-#define BOOTMAGIC_LITE_ROW      5
-#define BOOTMAGIC_LITE_COLUMN   0
-
-// partially generated by KBFirmware JSON to QMK Parser
-// https://noroadsleft.github.io/kbf_qmk_converter/
+#define BOOTMAGIC_LITE_ROW      0
+#define BOOTMAGIC_LITE_COLUMN   5