boards/particle-xenon: initial support

boards/particle-xenon/Makefile

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+MODULE = board
+
+DIRS = $(RIOTBOARD)/common/particle-mesh
+
+include $(RIOTBASE)/Makefile.base

boards/particle-xenon/Makefile.dep

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+include $(RIOTBOARD)/common/particle-mesh/Makefile.dep

boards/particle-xenon/Makefile.features

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+include $(RIOTBOARD)/common/particle-mesh/Makefile.features

boards/particle-xenon/Makefile.include

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+USEMODULE += boards_common_particle_mesh
+
+include $(RIOTBOARD)/common/particle-mesh/Makefile.include

boards/particle-xenon/doc.txt

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+/**
+@defgroup    boards_particle-xenon Particle Xenon
+@ingroup     boards
+@brief       Support for the Particle Xenon
+
+### General information
+
+[Particle Xenon](https://docs.particle.io/xenon/) is a mesh-ready development kit
+that provides access to multiple communication protocols: BLE, 802.15.4.
+
+<img src="https://docs.particle.io/assets/images/xenon/xenon-top.png"
+     alt="pinout" style="height:300px;"/>
+
+### Block diagrams and datasheets
+
+<img src="https://docs.particle.io/assets/images/xenon/xenon-block-diagram.png"
+     alt="pinout" style="height:800px;"/>
+
+The board datasheet is available [here](https://docs.particle.io/assets/pdfs/datasheets/xenon-datasheet.pdf)
+
+### Flash the board
+
+See the `Flashing` section in @ref boards_common_particle-mesh.
+
+ */

boards/particle-xenon/include/periph_conf.h

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+/*
+ * Copyright (C) 2019 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_particle-xenon
+ * @{
+ *
+ * @file
+ * @brief       Peripheral configuration for the Particle Xenon
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ */
+
+#ifndef PERIPH_CONF_H
+#define PERIPH_CONF_H
+
+#include "periph_cpu.h"
+#include "periph_conf_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name    UART configuration
+ * @{
+ */
+static const uart_conf_t uart_config[] = {
+    {
+        .dev        = NRF_UARTE0,
+        .rx_pin     = GPIO_PIN(0,8),
+        .tx_pin     = GPIO_PIN(0,6),
+        .rts_pin    = (uint8_t)GPIO_UNDEF,
+        .cts_pin    = (uint8_t)GPIO_UNDEF,
+        .irqn       = UARTE0_UART0_IRQn,
+    },
+};
+
+#define UART_0_ISR          (isr_uart0)
+
+#define UART_NUMOF          (sizeof(uart_config) / sizeof(uart_config[0]))
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PERIPH_CONF_H */