add a variant based on the nrf52840-dk but with a RC clock.

Because I was dumb and accidentally ran some code that configured gpio 0
as an output and that was enough to smoke the xtal that was preinstalled
between P0.0 and P0.1.

boards/ppr.json

@@ -0,0 +1,46 @@
+{
+  "build": {
+    "arduino": {
+      "ldscript": "nrf52840_s140_v6.ld"
+    },
+    "core": "nRF5",
+    "cpu": "cortex-m4",
+    "extra_flags": "-DARDUINO_NRF52840_PPR -DNRF52840_XXAA",
+    "f_cpu": "64000000L",
+    "hwids": [["0x239A", "0x4403"]],
+    "usb_product": "PPR",
+    "mcu": "nrf52840",
+    "variant": "pca10056-rc-clock",
+    "variants_dir": "variants",
+    "bsp": {
+      "name": "adafruit"
+    },
+    "softdevice": {
+      "sd_flags": "-DS140",
+      "sd_name": "s140",
+      "sd_version": "6.1.1",
+      "sd_fwid": "0x00B6"
+    },
+    "bootloader": {
+      "settings_addr": "0xFF000"
+    }
+  },
+  "connectivity": ["bluetooth"],
+  "debug": {
+    "jlink_device": "nRF52840_xxAA",
+    "onboard_tools": ["jlink"],
+    "svd_path": "nrf52840.svd"
+  },
+  "frameworks": ["arduino"],
+  "name": "Meshtastic PPR (Adafruit BSP)",
+  "upload": {
+    "maximum_ram_size": 248832,
+    "maximum_size": 815104,
+    "require_upload_port": true,
+    "speed": 115200,
+    "protocol": "jlink",
+    "protocols": ["jlink", "nrfjprog", "stlink"]
+  },
+  "url": "https://meshtastic.org/",
+  "vendor": "Othernet"
+}

docs/software/nrf52-TODO.md

@@ -56,6 +56,7 @@ Needed to be fully functional at least at the same level of the ESP32 boards. At
 
 Nice ideas worth considering someday...
 
+- Currently we use Nordic's vendor ID, which is apparently okay: https://devzone.nordicsemi.com/f/nordic-q-a/44014/using-nordic-vid-and-pid-for-nrf52840 and I just picked a PID of 0x4403
 - Use NRF logger module (includes flash logging etc...) instead of DEBUG_MSG
 - Use "LED softblink" library on NRF52 to do nice pretty "breathing" LEDs. Don't whack LED from main thread anymore.
 - decrease BLE xmit power "At 0dBm with the DC/DC on, the nRF52832 transmitter draws 5.3mA. Increasing the TX power to +4dBm adds only 2.2mA. Decreasing it to -40 dBm saves only 2.6mA."

platformio.ini

@@ -125,7 +125,8 @@ build_flags =
 ; This is a temporary build target to test turning off particular hardare bits in the build (to improve modularity)
 [env:bare]
 platform = nordicnrf52
-board = nrf52840_dk_adafruit ; nicer than nrf52840_dk - more full gpio mappings
+; board = nrf52840_dk_adafruit ; nicer than nrf52840_dk - more full gpio mappings
+board = ppr
 framework = arduino
 debug_tool = jlink
 build_flags = 

variants/pca10056-rc-clock/variant.cpp

@@ -0,0 +1,49 @@
+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2016 Sandeep Mistry All right reserved.
+  Copyright (c) 2018, Adafruit Industries (adafruit.com)
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "variant.h"
+#include "wiring_constants.h"
+#include "wiring_digital.h"
+#include "nrf.h"
+
+const uint32_t g_ADigitalPinMap[] =
+{
+  // P0
+  0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 ,
+  8 , 9 , 10, 11, 12, 13, 14, 15,
+  16, 17, 18, 19, 20, 21, 22, 23,
+  24, 25, 26, 27, 28, 29, 30, 31,
+
+  // P1
+  32, 33, 34, 35, 36, 37, 38, 39,
+  40, 41, 42, 43, 44, 45, 46, 47
+};
+
+
+void initVariant()
+{
+  // LED1 & LED2
+  pinMode(PIN_LED1, OUTPUT);
+  ledOff(PIN_LED1);
+
+  pinMode(PIN_LED2, OUTPUT);
+  ledOff(PIN_LED2);;
+}
+

variants/pca10056-rc-clock/variant.h

@@ -0,0 +1,150 @@
+/*
+ Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+ Copyright (c) 2016 Sandeep Mistry All right reserved.
+ Copyright (c) 2018, Adafruit Industries (adafruit.com)
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ See the GNU Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _VARIANT_PCA10056_
+#define _VARIANT_PCA10056_
+
+/** Master clock frequency */
+#define VARIANT_MCK (64000000ul)
+
+// This file is the same as the standard pac10056 variant, except that @geeksville broke the xtal on his devboard so
+// he has to use a RC clock.
+
+// #define USE_LFXO // Board uses 32khz crystal for LF
+#define USE_LFRC // Board uses RC for LF
+
+/*----------------------------------------------------------------------------
+ *        Headers
+ *----------------------------------------------------------------------------*/
+
+#include "WVariant.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+// Number of pins defined in PinDescription array
+#define PINS_COUNT (48)
+#define NUM_DIGITAL_PINS (48)
+#define NUM_ANALOG_INPUTS (6)
+#define NUM_ANALOG_OUTPUTS (0)
+
+// LEDs
+#define PIN_LED1 (13)
+#define PIN_LED2 (14)
+
+#define LED_BUILTIN PIN_LED1
+#define LED_CONN PIN_LED2
+
+#define LED_RED PIN_LED1
+#define LED_BLUE PIN_LED2
+
+#define LED_STATE_ON 0 // State when LED is litted
+
+/*
+ * Buttons
+ */
+#define PIN_BUTTON1 11
+#define PIN_BUTTON2 12
+#define PIN_BUTTON3 24
+#define PIN_BUTTON4 25
+
+/*
+ * Analog pins
+ */
+#define PIN_A0 (3)
+#define PIN_A1 (4)
+#define PIN_A2 (28)
+#define PIN_A3 (29)
+#define PIN_A4 (30)
+#define PIN_A5 (31)
+#define PIN_A6 (0xff)
+#define PIN_A7 (0xff)
+
+static const uint8_t A0 = PIN_A0;
+static const uint8_t A1 = PIN_A1;
+static const uint8_t A2 = PIN_A2;
+static const uint8_t A3 = PIN_A3;
+static const uint8_t A4 = PIN_A4;
+static const uint8_t A5 = PIN_A5;
+static const uint8_t A6 = PIN_A6;
+static const uint8_t A7 = PIN_A7;
+#define ADC_RESOLUTION 14
+
+// Other pins
+#define PIN_AREF (2)
+#define PIN_NFC1 (9)
+#define PIN_NFC2 (10)
+
+static const uint8_t AREF = PIN_AREF;
+
+/*
+ * Serial interfaces
+ */
+
+// Arduino Header D0, D1
+#define PIN_SERIAL1_RX (33) // P1.01
+#define PIN_SERIAL1_TX (34) // P1.02
+
+// Connected to Jlink CDC
+#define PIN_SERIAL2_RX (8)
+#define PIN_SERIAL2_TX (6)
+
+/*
+ * SPI Interfaces
+ */
+#define SPI_INTERFACES_COUNT 1
+
+#define PIN_SPI_MISO (46)
+#define PIN_SPI_MOSI (45)
+#define PIN_SPI_SCK (47)
+
+static const uint8_t SS = 44;
+static const uint8_t MOSI = PIN_SPI_MOSI;
+static const uint8_t MISO = PIN_SPI_MISO;
+static const uint8_t SCK = PIN_SPI_SCK;
+
+/*
+ * Wire Interfaces
+ */
+#define WIRE_INTERFACES_COUNT 1
+
+#define PIN_WIRE_SDA (26)
+#define PIN_WIRE_SCL (27)
+
+// QSPI Pins
+#define PIN_QSPI_SCK 19
+#define PIN_QSPI_CS 17
+#define PIN_QSPI_IO0 20
+#define PIN_QSPI_IO1 21
+#define PIN_QSPI_IO2 22
+#define PIN_QSPI_IO3 23
+
+// On-board QSPI Flash
+#define EXTERNAL_FLASH_DEVICES MX25R6435F
+#define EXTERNAL_FLASH_USE_QSPI
+
+#ifdef __cplusplus
+}
+#endif
+
+/*----------------------------------------------------------------------------
+ *        Arduino objects - C++ only
+ *----------------------------------------------------------------------------*/
+
+#endif