Trigger 1200bps reset only if serial is in connected state

This patch MUST be retested on every OS

Author: facchinm

cores/arduino/CDC.h

@@ -8,18 +8,18 @@
 #ifdef SERIAL_CDC
 #include "USBSerial.h"
 
-static void usbPortChanged(int baud, int bits, int parity, int stop) {
-  if (baud == 1200) {
-    _ontouch1200bps_();
-  }
-}
-
 namespace arduino {
 
 namespace internal {
 extern USBSerial _serial;
 }
 
+static void usbPortChanged(int baud, int bits, int parity, int stop) {
+  if (baud == 1200 && internal::_serial.connected()) {
+    _ontouch1200bps_();
+  }
+}
+
 class CDC : public HardwareSerial {
 	public:
 		CDC() {}

variants/ARDUINO_NANO33BLE/pins_arduino.h

@@ -132,10 +132,6 @@ static const uint8_t SCK  = PIN_SPI_SCK;
 
 #define digitalPinToPort(P)		(digitalPinToPinName(P)/32)
 
-static inline void _ontouch1200bps_() {
-	__disable_irq();
-	NRF_POWER->GPREGRET = DFU_MAGIC_SERIAL_ONLY_RESET;
-	NVIC_SystemReset();
-}
+void _ontouch1200bps_();
 
 #endif //__PINS_ARDUINO__

variants/ARDUINO_NANO33BLE/variant.cpp

@@ -79,4 +79,11 @@ void initVariant() {
 #ifdef SERIAL_CDC
 #include "CDC.h"
 CDC SerialUSB;
+
+void _ontouch1200bps_() {
+  __disable_irq();
+  NRF_POWER->GPREGRET = DFU_MAGIC_SERIAL_ONLY_RESET;
+  NVIC_SystemReset();
+}
+
 #endif