codal_app/microbithal: Add microbit_hal_pin_write_ws2812 function.

Author: dpgeorge

src/codal_app/microbithal.cpp

@@ -26,6 +26,7 @@
 
 #include "main.h"
 #include "MicroBitDevice.h"
+#include "neopixel.h"
 
 extern "C" {
 
@@ -162,6 +163,10 @@ int microbit_hal_pin_is_touched(int pin) {
     return pin_obj[pin]->isTouched();
 }
 
+void microbit_hal_pin_write_ws2812(int pin, const uint8_t *buf, size_t len) {
+    neopixel_send_buffer(*pin_obj[pin], buf, len);
+}
+
 int microbit_hal_i2c_init(int scl, int sda, int freq) {
     // TODO set pins
     int ret = uBit.i2c.setFrequency(freq);

src/codal_app/microbithal.h

@@ -93,6 +93,7 @@ void microbit_hal_pin_write(int pin, int value);
 int microbit_hal_pin_read_analog_u10(int pin);
 void microbit_hal_pin_write_analog_u10(int pin, int value);
 int microbit_hal_pin_is_touched(int pin);
+void microbit_hal_pin_write_ws2812(int pin, const uint8_t *buf, size_t len);
 
 int microbit_hal_i2c_init(int scl, int sda, int freq);
 int microbit_hal_i2c_readfrom(uint8_t addr, uint8_t *buf, size_t len, int stop);