test build of 'Host shield' in minimal env.

protocol/usb_hid/override_Serial.cpp

@@ -0,0 +1,51 @@
+/*
+ * Null implementation of Serial to dump debug print into blackhole
+ */
+#include "Arduino.h"
+#include "sendchar.h"
+
+#include "USBAPI.h"
+
+
+void Serial_::begin(uint16_t baud_count)
+{
+}
+
+void Serial_::end(void)
+{
+}
+
+void Serial_::accept(void)
+{
+}
+
+int Serial_::available(void)
+{
+    return 0;
+}
+
+int Serial_::peek(void)
+{
+    return -1;
+}
+
+int Serial_::read(void)
+{
+    return -1;
+}
+
+void Serial_::flush(void)
+{
+}
+
+size_t Serial_::write(uint8_t c)
+{
+    sendchar(c);
+    return 1;
+}
+
+Serial_::operator bool() {
+    return true;
+}
+
+Serial_ Serial;