Measuring and Improving Serial Performance / Serial.flush() Blocks Forever on Nano 33 BLE Sense

J-M-L · November 12, 2021, 5:33pm

ok - I was looking there

arduino/ArduinoCore-mbed/blob/944e988d61841f5f2790ecc06e66df92354c984d/cores/arduino/Serial.cpp#L197-L207


      
          void UART::flush() {
          #if defined(SERIAL_CDC)
          	if (is_usb) {
          		while(!_SerialUSB.writeable());
          	} else {
          		while(!_serial->obj->writeable());
          	}
          #else
          	while(!_serial->obj->writeable());
          #endif
          }

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Measuring and Improving Serial Performance / Serial.flush() Blocks Forever on Nano 33 BLE Sense

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