Merge pull request #2870 from kattni/pixelbuf-colorwheel-fix

Fix colorwheel RGB order and update name

Author: dhalbert

ports/atmel-samd/boards/hallowing_m0_express/mpconfigboard.mk

@@ -20,7 +20,7 @@ CIRCUITPY_I2CSLAVE = 0
 CIRCUITPY_ROTARYIO = 0
 CIRCUITPY_RTC = 0
 
-CFLAGS_INLINE_LIMIT = 60
+CFLAGS_INLINE_LIMIT = 55
 SUPEROPT_GC = 0
 
 # Include these Python libraries in firmware.

shared-bindings/_pixelbuf/__init__.c

@@ -53,36 +53,39 @@
 //|     PixelBuf
 
 
-//| .. function:: wheel(n)
+//| .. function:: colorwheel(n)
 //|
 //|     C implementation of the common wheel() function found in many examples.
 //|     Returns the colorwheel RGB value as an integer value for n (usable in :py:class:`PixelBuf`, neopixel, and dotstar).
 //|
+//| .. function:: wheel(n)
+//|     Use of wheel() is deprecated. Please use colorwheel().
 
-STATIC mp_obj_t pixelbuf_wheel(mp_obj_t n) {
+STATIC mp_obj_t pixelbuf_colorwheel(mp_obj_t n) {
     return MP_OBJ_NEW_SMALL_INT(colorwheel(MP_OBJ_IS_SMALL_INT(n) ? MP_OBJ_SMALL_INT_VALUE(n) : mp_obj_float_get(n)));
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(pixelbuf_wheel_obj, pixelbuf_wheel);
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pixelbuf_colorwheel_obj, pixelbuf_colorwheel);
 
 const int32_t colorwheel(float pos) {
     if (pos > 255) {
         pos = pos - ((uint32_t)(pos / 256) * 256);
     }
     if (pos < 85)
-        return (uint8_t)(pos * 3) << 16 | (uint8_t)(255 - (pos * 3)) << 8;
+        return (uint8_t)(255 - (pos * 3)) << 16 | (uint8_t)(pos * 3) << 8;
     else if (pos < 170) {
         pos -= 85;
-        return (uint8_t)(255 - (pos * 3)) << 16 | (uint8_t)(pos * 3);
+        return (uint8_t)(255 - (pos * 3)) << 8 | (uint8_t)(pos * 3);
     } else {
         pos -= 170;
-        return (uint8_t)(pos * 3) << 8 | (uint8_t)(255 - pos * 3);
+        return (uint8_t)(pos * 3) << 16 | (uint8_t)(255 - (pos * 3));
     }
 }
 
 STATIC const mp_rom_map_elem_t pixelbuf_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__pixelbuf) },
     { MP_ROM_QSTR(MP_QSTR_PixelBuf), MP_ROM_PTR(&pixelbuf_pixelbuf_type) },
-    { MP_ROM_QSTR(MP_QSTR_wheel), MP_ROM_PTR(&pixelbuf_wheel_obj) },
+    { MP_ROM_QSTR(MP_QSTR_wheel), MP_ROM_PTR(&pixelbuf_colorwheel_obj) },
+    { MP_ROM_QSTR(MP_QSTR_colorwheel), MP_ROM_PTR(&pixelbuf_colorwheel_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(pixelbuf_module_globals, pixelbuf_module_globals_table);