Add support for Arduino MKR WAN 1300 boards (#105)

* Add support for Arduino MKR WAN 1300 board
* Add new LoRa.setSPI(...) API to use radio with a different SPI interface
* Disable LoRa.onReceive(...) and LoRa.receive() on Arduino MKR WAN 1300
* Add errors on sketches not compatible with the Arduino MKR WAN 1300

Author: sandeepmistry

Diff for: .travis.yml

@@ -9,6 +9,7 @@ env:
     - BOARD="arduino:samd:arduino_zero_edbg"
     - BOARD="arduino:samd:mkr1000"
     - BOARD="arduino:samd:mkrzero"
+    - BOARD="arduino:samd:mkrwan1300"
 before_install:
   - wget http://downloads.arduino.cc/arduino-$IDE_VERSION-linux64.tar.xz
   - tar xf arduino-$IDE_VERSION-linux64.tar.xz
@@ -24,9 +25,13 @@ install:
 script:
   - buildExampleSketch LoRaDumpRegisters
   - buildExampleSketch LoRaDuplex
-  - buildExampleSketch LoRaDuplexCallback
+  - if [[ "$BOARD" != "arduino:samd:mkrwan1300" ]]; then
+      buildExampleSketch LoRaDuplexCallback;
+    fi
   - buildExampleSketch LoRaReceiver
-  - buildExampleSketch LoRaReceiverCallback
+  - if [[ "$BOARD" != "arduino:samd:mkrwan1300" ]]; then
+      buildExampleSketch LoRaReceiverCallback;
+    fi
   - buildExampleSketch LoRaSender
   - buildExampleSketch LoRaSetSpread
   - buildExampleSketch LoRaSetSyncWord

Diff for: API.md

@@ -38,6 +38,17 @@ To save further pins one could connect the reset pin of the MCU with reset pin o
 
 * `reset` - set to `-1` to omit this pin
 
+### Set SPI interface
+
+Override the default SPI interface used by the library. **Must** be called before `LoRa.begin()`.
+
+```arduino
+LoRa.setSPI(spi);
+```
+ * `spi` - new SPI interface to use, defaults to `SPI`
+
+This call is optional and only needs to be used if you need to change the default SPI interface used, in the case your Arduino (or compatible) board has more than one SPI interface present.
+
 ### Set SPI Frequency
 
 Override the default SPI frequency of 10 MHz used by the library. **Must** be called before `LoRa.begin()`.
@@ -122,6 +133,8 @@ Returns the packet size in bytes or `0` if no packet was received.
 
 ### Continuous receive mode
 
+**WARNING**: Not supported on the Arduino MKR WAN 1300 board!
+
 #### Register callback
 
 Register a callback function for when a packet is received.

Diff for: README.md

@@ -10,6 +10,9 @@ An [Arduino](https://arduino.cc/) library for sending and receiving data using [
    * [Dragino Lora Shield](http://www.dragino.com/products/module/item/102-lora-shield.html)
    * [HopeRF](http://www.hoperf.com/rf_transceiver/lora/) [RFM95W](http://www.hoperf.com/rf_transceiver/lora/RFM95W.html), [RFM96W](http://www.hoperf.com/rf_transceiver/lora/RFM96W.html), and [RFM98W](http://www.hoperf.com/rf_transceiver/lora/RFM98W.html)
    * [Modtronix](http://modtronix.com/) [inAir4](http://modtronix.com/inair4.html), [inAir9](http://modtronix.com/inair9.html), and [inAir9B](http://modtronix.com/inair9b.html)
+ * [Arduino MKR WAN 1300](https://store.arduino.cc/usa/mkr-wan-1300)
+   * **NOTE:** Requires firmware v1.1.6 or later on the on-board Murata module
+   * **WARNING**: [LoRa.onReceive(...)](https://github.com/sandeepmistry/arduino-LoRa/blob/master/API.md#register-callback) and [LoRa.recieve()](https://github.com/sandeepmistry/arduino-LoRa/blob/master/API.md#receive-mode) is not compatible with this board!
 
 ### Semtech SX1276/77/78/79 wiring
 

Diff for: examples/LoRaDuplexCallback/LoRaDuplexCallback.ino

@@ -15,6 +15,10 @@
 #include <SPI.h>              // include libraries
 #include <LoRa.h>
 
+#ifdef ARDUINO_SAMD_MKRWAN1300
+#error "This example is not compatible with the Arduino MKR WAN 1300 board!"
+#endif
+
 const int csPin = 7;          // LoRa radio chip select
 const int resetPin = 6;       // LoRa radio reset
 const int irqPin = 1;         // change for your board; must be a hardware interrupt pin

Diff for: examples/LoRaReceiverCallback/LoRaReceiverCallback.ino

@@ -1,6 +1,10 @@
 #include <SPI.h>
 #include <LoRa.h>
 
+#ifdef ARDUINO_SAMD_MKRWAN1300
+#error "This example is not compatible with the Arduino MKR WAN 1300 board!"
+#endif
+
 void setup() {
   Serial.begin(9600);
   while (!Serial);

Diff for: src/LoRa.cpp

@@ -54,7 +54,8 @@
 #define MAX_PKT_LENGTH           255
 
 LoRaClass::LoRaClass() :
-  _spiSettings(8E6, MSBFIRST, SPI_MODE0),
+  _spiSettings(LORA_DEFAULT_SPI_FREQUENCY, MSBFIRST, SPI_MODE0),
+  _spi(&LORA_DEFAULT_SPI),
   _ss(LORA_DEFAULT_SS_PIN), _reset(LORA_DEFAULT_RESET_PIN), _dio0(LORA_DEFAULT_DIO0_PIN),
   _frequency(0),
   _packetIndex(0),
@@ -67,6 +68,23 @@ LoRaClass::LoRaClass() :
 
 int LoRaClass::begin(long frequency)
 {
+#ifdef ARDUINO_SAMD_MKRWAN1300
+  pinMode(LORA_IRQ_DUMB, OUTPUT);
+  digitalWrite(LORA_IRQ_DUMB, LOW);
+
+  // Hardware reset
+  pinMode(LORA_BOOT0, OUTPUT);
+  digitalWrite(LORA_BOOT0, LOW);
+
+  pinMode(LORA_RESET, OUTPUT);
+  digitalWrite(LORA_RESET, HIGH);
+  delay(200);
+  digitalWrite(LORA_RESET, LOW);
+  delay(200);
+  digitalWrite(LORA_RESET, HIGH);
+  delay(50);
+#endif
+
   // setup pins
   pinMode(_ss, OUTPUT);
   // set SS high
@@ -83,7 +101,7 @@ int LoRaClass::begin(long frequency)
   }
 
   // start SPI
-  SPI.begin();
+  _spi->begin();
 
   // check version
   uint8_t version = readRegister(REG_VERSION);
@@ -122,7 +140,7 @@ void LoRaClass::end()
   sleep();
 
   // stop SPI
-  SPI.end();
+  _spi->end();
 }
 
 int LoRaClass::beginPacket(int implicitHeader)
@@ -296,6 +314,7 @@ void LoRaClass::flush()
 {
 }
 
+#ifndef ARDUINO_SAMD_MKRWAN1300
 void LoRaClass::onReceive(void(*callback)(int))
 {
   _onReceive = callback;
@@ -328,6 +347,7 @@ void LoRaClass::receive(int size)
 
   writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_CONTINUOUS);
 }
+#endif
 
 void LoRaClass::idle()
 {
@@ -504,6 +524,11 @@ void LoRaClass::setPins(int ss, int reset, int dio0)
   _dio0 = dio0;
 }
 
+void LoRaClass::setSPI(SPIClass& spi)
+{
+  _spi = &spi;
+}
+
 void LoRaClass::setSPIFrequency(uint32_t frequency)
 {
   _spiSettings = SPISettings(frequency, MSBFIRST, SPI_MODE0);
@@ -575,10 +600,10 @@ uint8_t LoRaClass::singleTransfer(uint8_t address, uint8_t value)
 
   digitalWrite(_ss, LOW);
 
-  SPI.beginTransaction(_spiSettings);
-  SPI.transfer(address);
-  response = SPI.transfer(value);
-  SPI.endTransaction();
+  _spi->beginTransaction(_spiSettings);
+  _spi->transfer(address);
+  response = _spi->transfer(value);
+  _spi->endTransaction();
 
   digitalWrite(_ss, HIGH);
 

Diff for: src/LoRa.h

@@ -7,12 +7,22 @@
 #include <Arduino.h>
 #include <SPI.h>
 
-#define LORA_DEFAULT_SS_PIN    10
-#define LORA_DEFAULT_RESET_PIN 9
-#define LORA_DEFAULT_DIO0_PIN  2
+#ifdef ARDUINO_SAMD_MKRWAN1300
+#define LORA_DEFAULT_SPI           SPI1
+#define LORA_DEFAULT_SPI_FREQUENCY 250000
+#define LORA_DEFAULT_SS_PIN        LORA_IRQ_DUMB
+#define LORA_DEFAULT_RESET_PIN     -1
+#define LORA_DEFAULT_DIO0_PIN      -1
+#else
+#define LORA_DEFAULT_SPI           SPI
+#define LORA_DEFAULT_SPI_FREQUENCY 8E6 
+#define LORA_DEFAULT_SS_PIN        10
+#define LORA_DEFAULT_RESET_PIN     9
+#define LORA_DEFAULT_DIO0_PIN      2
+#endif
 
-#define PA_OUTPUT_RFO_PIN      0
-#define PA_OUTPUT_PA_BOOST_PIN 1
+#define PA_OUTPUT_RFO_PIN          0
+#define PA_OUTPUT_PA_BOOST_PIN     1
 
 class LoRaClass : public Stream {
 public:
@@ -39,9 +49,11 @@ class LoRaClass : public Stream {
   virtual int peek();
   virtual void flush();
 
+#ifndef ARDUINO_SAMD_MKRWAN1300
   void onReceive(void(*callback)(int));
 
   void receive(int size = 0);
+#endif
   void idle();
   void sleep();
 
@@ -62,6 +74,7 @@ class LoRaClass : public Stream {
   byte random();
 
   void setPins(int ss = LORA_DEFAULT_SS_PIN, int reset = LORA_DEFAULT_RESET_PIN, int dio0 = LORA_DEFAULT_DIO0_PIN);
+  void setSPI(SPIClass& spi);
   void setSPIFrequency(uint32_t frequency);
 
   void dumpRegisters(Stream& out);
@@ -85,6 +98,7 @@ class LoRaClass : public Stream {
 
 private:
   SPISettings _spiSettings;
+  SPIClass* _spi;
   int _ss;
   int _reset;
   int _dio0;