Add support for Waveshare nRF52840 Eval Kit.

The board is basically a breakout for all pins on 52840 plus a couple nice extras like USB>Serial dongle, leds, button(s) and 2.54mm headers for all I/O.

src/boards/waveshare_nrf52840_eval/board.h

@@ -0,0 +1,81 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef _WAVESHARE_NRF52840_H
+#define _WAVESHARE_NRF52840_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER           2
+/* This is led marked LED1 on the board */
+#define LED_PRIMARY_PIN       _PINNUM(0, 13)
+/* This is led marked LED2 on the board */
+#define LED_SECONDARY_PIN     _PINNUM(0, 14)
+/* There are two more LEDs, but for the purposes of bootloader that
+ * doesn't matter. */
+#define LED_STATE_ON          0
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER        2
+/* This is the 'KEY1' in top left of the board under RESET key.
+ * It is used to remain in bootloader mode after reset. */
+#define BUTTON_1              _PINNUM(0, 11)
+/* Pin below is in the bottom left of PCB, and can be shorted to GND
+ * with a regular 2.54mm jumper or tweezers. This pin is used to
+ * clear user firmware and remain in bootloader mode. */
+#define BUTTON_2              _PINNUM(0, 29)
+#define BUTTON_PULL           NRF_GPIO_PIN_PULLUP
+
+/*------------------------------------------------------------------*/
+/* UART (only used by nRF52832)
+ *------------------------------------------------------------------*/
+#define RX_PIN_NUMBER         8
+#define TX_PIN_NUMBER         6
+#define CTS_PIN_NUMBER        0
+#define RTS_PIN_NUMBER        0
+#define HWFC                  false
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER   "Waveshare"
+#define BLEDIS_MODEL          "nRF52840 Eval"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x0029
+#define USB_DESC_CDC_ONLY_PID  0x002A
+
+//------------- UF2 -------------//
+#define UF2_PRODUCT_NAME      "Waveshare nRF52840 Eval"
+#define UF2_VOLUME_LABEL      "WS52840EVK"
+#define UF2_BOARD_ID          "WS-nRF52840-EVK"
+#define UF2_INDEX_URL         "https://www.waveshare.com/wiki/NRF52840_Eval_Kit"
+
+#endif // _WAVESHARE_NRF52840_H

src/boards/waveshare_nrf52840_eval/board.mk

@@ -0,0 +1 @@
+MCU_SUB_VARIANT = nrf52840