Add support for Arduino Nano 33 IoT board

Author: sandeepmistry

src/local/BLELocalDevice.cpp

@@ -35,19 +35,28 @@ BLELocalDevice::~BLELocalDevice()
 
 int BLELocalDevice::begin()
 {
-#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
+#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_SAMD_NANO_33_IOT)
   // reset the NINA in BLE mode
   pinMode(SPIWIFI_SS, OUTPUT);
   pinMode(NINA_RESETN, OUTPUT);
 
   digitalWrite(SPIWIFI_SS, LOW);
+#endif
 
+#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
   digitalWrite(NINA_RESETN, HIGH);
   delay(100);
   digitalWrite(NINA_RESETN, LOW);
   delay(750);
+#elif defined(ARDUINO_SAMD_NANO_33_IOT)
+  // inverted reset
+  digitalWrite(NINA_RESETN, LOW);
+  delay(100);
+  digitalWrite(NINA_RESETN, HIGH);
+  delay(750);
 #endif
 
+
 #ifdef ARDUINO_AVR_UNO_WIFI_REV2
   // set SS HIGH
   digitalWrite(SPIWIFI_SS, HIGH);
@@ -111,6 +120,9 @@ void BLELocalDevice::end()
 #if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
   // disable the NINA
   digitalWrite(NINA_RESETN, HIGH);
+#elif defined(ARDUINO_SAMD_NANO_33_IOT)
+  // disable the NINA
+  digitalWrite(NINA_RESETN, LOW);
 #endif
 }
 

src/utility/HCIUartTransport.cpp

@@ -21,6 +21,8 @@
 
 #if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
 #define SerialHCI Serial2
+#elif defined(ARDUINO_SAMD_NANO_33_IOT)
+// SerialHCI is already defined in the variant
 #else
 #error "Unsupported board selected!"
 #endif