added led helper methods. Added boards.txt

Author: outlandnish

README.md

@@ -9,6 +9,7 @@ This repository contains the Arduino BSP for Adafruit Bluefruit nRF52 series:
 Following boards are also included but are not officially supported:
 
 - [Nordic nRF52840DK PCA10056](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK)
+- [Particle Xenon](https://store.particle.io/products/xenon)
 
 ## BSP Installation
 
@@ -103,6 +104,20 @@ $ nrfjprog --program feather_nrf52832_bootloader.hex -f nrf52
 $ nrfjprog --reset -f nrf52
 ```
 
+## Particle Xenon Specific
+```c++
+// Swap between the internal antenna and external u.FL antenna
+switchAntenna(bool useExternal);
+
+// Control RGB led / primary LED individually
+ledWrite(LED_RGB_RED, 255);
+ledWrite(LED_PRIMARY, 127);
+
+// Control RGB leds in one shot
+rgbLedWrite(50, 100, 150);
+
+```
+
 ## Credits
 
 This core is based on [Arduino-nRF5](https://github.com/sandeepmistry/arduino-nRF5) by Sandeep Mistry,

variants/particle_xenon/variant.cpp

@@ -56,6 +56,11 @@ const uint32_t g_ADigitalPinMap[] =
 void initVariant()
 {
   switch_antenna(false);
+
+  led_pwm_init(LED_PRIMARY_IDX, LED_PRIMARY_PIN);
+  led_pwm_init(LED_RGB_RED_IDX, LED_RGB_RED_PIN);
+  led_pwm_init(LED_RGB_BLUE_IDX, LED_RGB_BLUE_PIN);
+  led_pwm_init(LED_RGB_GREEN_IDX, LED_RGB_GREEN_PIN);
 }
 
 void switch_antenna(bool useExternal) {
@@ -106,6 +111,33 @@ void led_pwm_duty_cycle(uint32_t led_index, uint16_t duty_cycle) {
   nrf_pwm_task_trigger(NRF_PWM0, NRF_PWM_TASK_SEQSTART0);
 }
 
+void ledWrite(uint32_t led_pin, uint8_t value) {
+  uint32_t index = -1;
+  switch (led_pin) {
+    case LED_PRIMARY_PIN:
+      index = LED_PRIMARY_IDX;
+      break;
+    case LED_RGB_RED_PIN:
+      index = LED_RGB_RED_IDX;
+      break;
+    case LED_RGB_GREEN_PIN:
+      index = LED_RGB_GREEN_IDX;
+      break;
+    case LED_RGB_BLUE_PIN:
+      index = LED_RGB_BLUE_IDX;
+      break;
+  }
+
+  if (index != -1)
+    led_pwm_duty_cycle(index, value);
+}
+
+void rgbLedWrite(uint8_t red, uint8_t green, uint8_t blue) {
+  led_pwm_duty_cycle(LED_RGB_RED_IDX, red);
+  led_pwm_duty_cycle(LED_RGB_GREEN_IDX, green);
+  led_pwm_duty_cycle(LED_RGB_BLUE_IDX, blue);
+}
+
 void pwm_teardown(NRF_PWM_Type* pwm) {
   pwm->TASKS_SEQSTART[0] = 0;
   pwm->ENABLE            = 0;

variants/particle_xenon/variant.h

@@ -197,6 +197,8 @@ void led_pwm_init(uint32_t led_index, uint32_t led_pin);
 void led_pwm_teardown(void);
 void led_pwm_duty_cycle(uint32_t led_index, uint16_t duty_cycle);
 void pwm_teardown(NRF_PWM_Type* pwm);
+void ledWrite(uint32_t led_pin, uint8_t value);
+void rgbLedWrite(uint8_t red, uint8_t green, uint8_t blue);
 static uint16_t led_duty_cycles[PWM0_CH_NUM] = { 0 };
 
 #ifdef __cplusplus