boards/c/particle-mesh: Enable PWM on the LED pins

boards/common/particle-mesh/Kconfig

@@ -9,6 +9,7 @@ config BOARD_COMMON_PARTICLE_MESH
     select BOARD_COMMON_NRF52
     select CPU_MODEL_NRF52840XXAA
     select HAS_PERIPH_I2C
+    select HAS_PERIPH_PWM
     select HAS_PERIPH_SPI
     select HAS_PERIPH_UART
     select HAS_PERIPH_USBDEV

boards/common/particle-mesh/Makefile.features

@@ -2,6 +2,7 @@ CPU_MODEL = nrf52840xxaa
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_i2c
+FEATURES_PROVIDED += periph_pwm
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_uart
 FEATURES_PROVIDED += periph_usbdev

boards/common/particle-mesh/include/periph_conf_common.h

@@ -26,6 +26,8 @@
 #include "cfg_rtt_default.h"
 #include "cfg_timer_default.h"
 
+#include "board.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -46,6 +48,22 @@ static const spi_conf_t spi_config[] = {
 #define SPI_NUMOF           ARRAY_SIZE(spi_config)
 /** @} */
 
+/**
+ * @name    PWM configuration
+ *
+ * A single PWM device is used to map the three channels of the on-board RGB
+ * LED
+ *
+ * @{
+ */
+
+static const pwm_conf_t pwm_config[] = {
+    { NRF_PWM0, { LED0_PIN, LED1_PIN, LED2_PIN, GPIO_UNDEF } }
+};
+#define PWM_NUMOF           ARRAY_SIZE(pwm_config)
+
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif