pybricks.pupdevices.Remote: Fix bad color due to type punning violation.

This broke in newer GCC versions, causing the LED to get the wrong color.

Fixes pybricks/support#2497

Author: laurensvalk

CHANGELOG.md

@@ -25,10 +25,11 @@
   pre-release ([pybricks-micropython#425]).
 - Fixed internal rounding error that could could cause a Drive Base to be 1 mm
   off after driving 3 meters, depending on configuration parameters ([support#2500]).
-
+- Fixed Powered Up remote light getting the wrong color ([support#2497]).
 
 [support#1962]: https://github.com/pybricks/support/issues/1962
 [support#2468]: https://github.com/pybricks/support/issues/2468
+[support#2497]: https://github.com/pybricks/support/issues/2497
 [support#2500]: https://github.com/pybricks/support/issues/2500
 [pybricks-micropython#405]: https://github.com/pybricks/pybricks-micropython/pull/405
 [pybricks-micropython#421]: https://github.com/pybricks/pybricks-micropython/pull/421

pybricks/iodevices/pb_type_iodevices_lwp3device.c

@@ -241,12 +241,15 @@ static pbio_error_t pb_type_pupdevices_Remote_write_light_msg(mp_obj_t self_in,
         .cmd = LWP3_OUTPUT_CMD_WRITE_DIRECT_MODE_DATA,
         .mode = STATUS_LIGHT_MODE_RGB_0,
     };
-    pbio_color_hsv_to_rgb(hsv, (pbio_color_rgb_t *)msg.payload);
+
+    pbio_color_rgb_t rgb;
+    pbio_color_hsv_to_rgb(hsv, &rgb);
 
     // The red LED on the handset is weak, so we have to reduce green and blue
     // to get the colors right.
-    msg.payload[1] = msg.payload[1] * 3 / 8;
-    msg.payload[2] = msg.payload[2] * 3 / 8;
+    msg.payload[0] = rgb.r;
+    msg.payload[1] = rgb.g * 3 / 8;
+    msg.payload[2] = rgb.b * 3 / 8;
 
     return pbdrv_bluetooth_peripheral_write_characteristic(pb_lwp3device_char.handle, (const uint8_t *)&msg, sizeof(msg));
 }