From 25285a1c5a634c6bb2c1a7b4ef4dc5d44ac1aea2 Mon Sep 17 00:00:00 2001
From: Fred Sundvik <fsundvik@gmail.com>
Date: Sat, 30 Sep 2017 11:58:09 +0300
Subject: Don't process keycodes on the slave

---
 keyboards/ergodox_infinity/ergodox_infinity.c |  4 ++
 tmk_core/common/keyboard.c                    | 63 +++++++++++++++------------
 2 files changed, 39 insertions(+), 28 deletions(-)

diff --git a/keyboards/ergodox_infinity/ergodox_infinity.c b/keyboards/ergodox_infinity/ergodox_infinity.c
index 05b2d7ce31..87e1b524b6 100644
--- a/keyboards/ergodox_infinity/ergodox_infinity.c
+++ b/keyboards/ergodox_infinity/ergodox_infinity.c
@@ -126,6 +126,10 @@ void matrix_scan_kb(void) {
 	matrix_scan_user();
 }
 
+bool is_keyboard_master(void) {
+    return is_serial_link_master();
+}
+
 __attribute__ ((weak))
 void ergodox_board_led_on(void){
 }
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c
index 9466e10e2d..1b7c8c1a2f 100644
--- a/tmk_core/common/keyboard.c
+++ b/tmk_core/common/keyboard.c
@@ -119,6 +119,11 @@ void keyboard_setup(void) {
     matrix_setup();
 }
 
+__attribute__((weak))
+bool is_keyboard_master(void) {
+    return true;
+}
+
 void keyboard_init(void) {
     timer_init();
     matrix_init();
@@ -168,36 +173,38 @@ void keyboard_task(void)
     matrix_row_t matrix_change = 0;
 
     matrix_scan();
-    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
-        matrix_row = matrix_get_row(r);
-        matrix_change = matrix_row ^ matrix_prev[r];
-        if (matrix_change) {
+    if (is_keyboard_master()) {
+        for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
+            matrix_row = matrix_get_row(r);
+            matrix_change = matrix_row ^ matrix_prev[r];
+            if (matrix_change) {
 #ifdef MATRIX_HAS_GHOST
-            if (has_ghost_in_row(r, matrix_row)) {
-                /* Keep track of whether ghosted status has changed for
-                 * debugging. But don't update matrix_prev until un-ghosted, or
-                 * the last key would be lost.
-                 */
-                //if (debug_matrix && matrix_ghost[r] != matrix_row) {
-                //    matrix_print();
-                //}
+                if (has_ghost_in_row(r, matrix_row)) {
+                    /* Keep track of whether ghosted status has changed for
+                    * debugging. But don't update matrix_prev until un-ghosted, or
+                    * the last key would be lost.
+                    */
+                    //if (debug_matrix && matrix_ghost[r] != matrix_row) {
+                    //    matrix_print();
+                    //}
+                    //matrix_ghost[r] = matrix_row;
+                    continue;
+                }
                 //matrix_ghost[r] = matrix_row;
-                continue;
-            }
-            //matrix_ghost[r] = matrix_row;
-#endif
-            if (debug_matrix) matrix_print();
-            for (uint8_t c = 0; c < MATRIX_COLS; c++) {
-                if (matrix_change & ((matrix_row_t)1<<c)) {
-                    action_exec((keyevent_t){
-                        .key = (keypos_t){ .row = r, .col = c },
-                        .pressed = (matrix_row & ((matrix_row_t)1<<c)),
-                        .time = (timer_read() | 1) /* time should not be 0 */
-                    });
-                    // record a processed key
-                    matrix_prev[r] ^= ((matrix_row_t)1<<c);
-                    // process a key per task call
-                    goto MATRIX_LOOP_END;
+#endif
+                if (debug_matrix) matrix_print();
+                for (uint8_t c = 0; c < MATRIX_COLS; c++) {
+                    if (matrix_change & ((matrix_row_t)1<<c)) {
+                        action_exec((keyevent_t){
+                            .key = (keypos_t){ .row = r, .col = c },
+                            .pressed = (matrix_row & ((matrix_row_t)1<<c)),
+                            .time = (timer_read() | 1) /* time should not be 0 */
+                        });
+                        // record a processed key
+                        matrix_prev[r] ^= ((matrix_row_t)1<<c);
+                        // process a key per task call
+                        goto MATRIX_LOOP_END;
+                    }
                 }
             }
         }
-- 
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