rgblight split transfer non-eeprom config (#5396)

* Make rgblight_update_dword not update eeprom (we already have
eeconfig_update_rgblight for that).

Make split i2c keyboards transfer active rgblight config rather than
eeprom saved version of rgblight config, enabling runtime changes
that aren't persisted to eeprom.

* prev_level and prev_rgb only store successfully transmitted values

1 files changed, 7 insertions, 5 deletions

diff --git a/quantum/split_common/transport.c b/quantum/split_common/transport.c
index b16852bc1..3696a2aba 100644
--- a/quantum/split_common/transport.c
+++ b/quantum/split_common/transport.c
@@ -39,17 +39,19 @@ bool transport_master(matrix_row_t matrix[]) {
   static uint8_t prev_level = ~0;
   uint8_t        level      = get_backlight_level();
   if (level != prev_level) {
-    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_BACKLIT_START, (void *)&level, sizeof(level), TIMEOUT);
-    prev_level = level;
+    if (i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_BACKLIT_START, (void *)&level, sizeof(level), TIMEOUT) >= 0) {
+      prev_level = level;
+    }
   }
 #  endif
 
 #  ifdef RGBLIGHT_ENABLE
   static uint32_t prev_rgb = ~0;
-  uint32_t        rgb      = eeconfig_read_rgblight();
+  uint32_t        rgb      = rgblight_read_dword();
   if (rgb != prev_rgb) {
-    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_START, (void *)&rgb, sizeof(rgb), TIMEOUT);
-    prev_rgb = rgb;
+    if (i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_START, (void *)&rgb, sizeof(rgb), TIMEOUT) >= 0) {
+      prev_rgb = rgb;
+    }
   }
 #  endif