src: Patch codal-nrf52 with ws2812b timing patch.

From codal-nrf52 commit 84b1aeec870addcfb6027a924dbfe83f1f10c6db

Signed-off-by: Damien George <damien@micropython.org>

src/Makefile

@@ -19,6 +19,15 @@ define CODAL_PATCH
 	cat codal.patch | git -C $(CODAL_DIR) apply -
 endef
 
+define CODAL_LIBRARIES_CODAL_NRF52_CLEAN
+	git -C $(CODAL_DIR)/libraries/codal-nrf52 checkout inc
+endef
+
+define CODAL_LIBRARIES_CODAL_NRF52_PATCH
+	$(call CODAL_LIBRARIES_CODAL_NRF52_CLEAN)
+	cat neopixel_ws2812b_timing.patch | git -C $(CODAL_DIR)/libraries/codal-nrf52 apply -
+endef
+
 .PHONY: all codal_cmake codal_build libmicropython clean
 
 all: codal_build
@@ -33,7 +42,9 @@ codal_cmake:
 # Build the codal app and make the final HEX file
 codal_build: libmicropython
 	$(call CODAL_PATCH)
+	$(call CODAL_LIBRARIES_CODAL_NRF52_PATCH)
 	make -C $(BUILD)
+	$(call CODAL_LIBRARIES_CODAL_NRF52_CLEAN)
 	$(call CODAL_CLEAN)
 	arm-none-eabi-size $(CODAL_BUILD)/MICROBIT
 	$(PYTHON) addlayouttable.py $(SRC_HEX) $(SRC_MAP) -o $(DEST_HEX)

src/neopixel_ws2812b_timing.patch

@@ -0,0 +1,17 @@
+diff --git a/inc/WS2812B.h b/inc/WS2812B.h
+index 3a6deb6..a24967b 100644
+--- a/inc/WS2812B.h
++++ b/inc/WS2812B.h
+@@ -32,9 +32,9 @@ DEALINGS IN THE SOFTWARE.
+
+ #define WS2812B_BUFFER_SIZE         256
+ #define WS2812B_PAD                 (0x8000)
+-#define WS2812B_LOW                 (0x8000 | 6)
+-#define WS2812B_HIGH                (0x8000 | 10)
+-#define WS2812B_PWM_FREQ            500000
++#define WS2812B_LOW                 (0x8000 | 5) // 320ns
++#define WS2812B_HIGH                (0x8000 | 12) // 760ns
++#define WS2812B_PWM_FREQ            800000
+ #define WS2812B_ZERO_PADDING        50
+
+ /**