diff --git a/cores/arduino/SerialUSB.h b/cores/arduino/SerialUSB.h
index 94d5cc83..442d28d0 100644
--- a/cores/arduino/SerialUSB.h
+++ b/cores/arduino/SerialUSB.h
@@ -18,6 +18,8 @@ class SerialUSB_ : public ZephyrSerial {
void begin(unsigned long baudrate) { begin(baudrate, SERIAL_8N1); }
operator bool() override;
+ size_t write(const uint8_t *buffer, size_t size) override;
+ void flush() override;
protected:
uint32_t dtr = 0;
diff --git a/cores/arduino/USB.cpp b/cores/arduino/USB.cpp
index 6f45e1f2..60f5fc7a 100644
--- a/cores/arduino/USB.cpp
+++ b/cores/arduino/USB.cpp
@@ -124,5 +124,16 @@ arduino::SerialUSB_::operator bool() {
return dtr;
}
+
+size_t arduino::SerialUSB_::write(const uint8_t *buffer, size_t size) {
+ if (!Serial) return 0;
+ return arduino::ZephyrSerial::write(buffer, size);
+}
+
+void arduino::SerialUSB_::flush() {
+ if (!Serial) return;
+ arduino::ZephyrSerial::flush();
+}
+
arduino::SerialUSB_ Serial(usb_dev);
#endif
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