Fix led enabled slave (#3022)

* Account for backlight enabled flag when passing backlight level to slave

* Add BL_TOGG to keymap for testing

* Apply backlight fix to Iris

* Port I2C LED backlight control from Iris to Levinson

2 files changed, 28 insertions, 8 deletions

diff --git a/keyboards/iris/matrix.c b/keyboards/iris/matrix.c
index dcfc0216e..7195fb0ea 100644
--- a/keyboards/iris/matrix.c
+++ b/keyboards/iris/matrix.c
@@ -30,7 +30,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "pro_micro.h"
 #include "config.h"
 #include "timer.h"
-#include "backlight.h"
+
+#ifdef BACKLIGHT_ENABLE 
+    #include "backlight.h"
+    extern backlight_config_t backlight_config;
+#endif
 
 #ifdef USE_I2C
 #  include "i2c.h"
@@ -86,7 +90,6 @@ static matrix_row_t matrix_debouncing[MATRIX_ROWS];
     static void select_col(uint8_t col);
 #endif
 
-
 __attribute__ ((weak))
 void matrix_init_kb(void) {
     matrix_init_user();
@@ -202,7 +205,7 @@ int i2c_transaction(void) {
 
 #ifdef BACKLIGHT_ENABLE
     // Write backlight level for slave to read
-    err = i2c_master_write(get_backlight_level());
+    err = i2c_master_write(backlight_config.enable ? backlight_config.level : 0);
 #else
     // Write zero, so our byte index is the same
     err = i2c_master_write(0x00);
@@ -244,7 +247,7 @@ int serial_transaction(void) {
 
 #ifdef BACKLIGHT_ENABLE
     // Write backlight level for slave to read
-    serial_master_buffer[SERIAL_LED_ADDR] = get_backlight_level();
+    serial_master_buffer[SERIAL_LED_ADDR] = backlight_config.enable ? backlight_config.level : 0;
 #endif
     return 0;
 }
diff --git a/keyboards/levinson/matrix.c b/keyboards/levinson/matrix.c
index ed913f34b..7195fb0ea 100644
--- a/keyboards/levinson/matrix.c
+++ b/keyboards/levinson/matrix.c
@@ -1,5 +1,5 @@
 /*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2017 Danny Nguyen <danny@keeb.io>
 
 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
@@ -30,7 +30,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "pro_micro.h"
 #include "config.h"
 #include "timer.h"
-#include "backlight.h"
+
+#ifdef BACKLIGHT_ENABLE 
+    #include "backlight.h"
+    extern backlight_config_t backlight_config;
+#endif
 
 #ifdef USE_I2C
 #  include "i2c.h"
@@ -199,6 +203,15 @@ int i2c_transaction(void) {
     err = i2c_master_write(0x00);
     if (err) goto i2c_error;
 
+#ifdef BACKLIGHT_ENABLE
+    // Write backlight level for slave to read
+    err = i2c_master_write(backlight_config.enable ? backlight_config.level : 0);
+#else
+    // Write zero, so our byte index is the same
+    err = i2c_master_write(0x00);
+#endif
+    if (err) goto i2c_error;
+
     // Start read
     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
     if (err) goto i2c_error;
@@ -234,7 +247,7 @@ int serial_transaction(void) {
 
 #ifdef BACKLIGHT_ENABLE
     // Write backlight level for slave to read
-    serial_master_buffer[SERIAL_LED_ADDR] = get_backlight_level();
+    serial_master_buffer[SERIAL_LED_ADDR] = backlight_config.enable ? backlight_config.level : 0;
 #endif
     return 0;
 }
@@ -276,8 +289,12 @@ void matrix_slave_scan(void) {
     int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
 
 #ifdef USE_I2C
+#ifdef BACKLIGHT_ENABLE
+    // Read backlight level sent from master and update level on slave
+    backlight_set(i2c_slave_buffer[0]);
+#endif
     for (int i = 0; i < ROWS_PER_HAND; ++i) {
-        i2c_slave_buffer[i] = matrix[offset+i];
+        i2c_slave_buffer[i+1] = matrix[offset+i];
     }
 #else // USE_SERIAL
     for (int i = 0; i < ROWS_PER_HAND; ++i) {