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Commitaef4efc

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If sketch is not connected to serial - dump serial output
Current code would hang after a few Serial.print like statements happened when we are not connected tothe Serial monitor.So I put overrides in for the Serial.write(buf, cnt) and Serial.flush()That would first check to see if Serial returns true (DTR)...This appears to match the behavior of the MBED Portenta H8 code.
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‎cores/arduino/SerialUSB.h

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@@ -18,6 +18,8 @@ class SerialUSB_ : public ZephyrSerial {
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voidbegin(unsignedlong baudrate) {begin(baudrate, SERIAL_8N1); }
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operatorbool()override;
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size_twrite(constuint8_t *buffer,size_t size)override;
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voidflush()override;
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protected:
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uint32_t dtr =0;

‎cores/arduino/USB.cpp

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@@ -124,5 +124,16 @@ arduino::SerialUSB_::operator bool() {
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return dtr;
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}
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size_tarduino::SerialUSB_::write(constuint8_t *buffer,size_t size) {
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if (!Serial)return0;
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returnarduino::ZephyrSerial::write(buffer, size);
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}
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voidarduino::SerialUSB_::flush() {
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if (!Serial)return;
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arduino::ZephyrSerial::flush();
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}
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arduino::SerialUSB_Serial(usb_dev);
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#endif

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