uno_r4_wifi: start USB on HID inclusion

Author: facchinm

libraries/HID/HID.cpp

@@ -29,3 +29,9 @@ int HID_::SendReport(uint8_t id, const void* data, int len)
     _done = false;
     return tud_hid_report(id, data, len);
 }
+
+#ifdef ARDUINO_SANTIAGO_COMPOSTA
+void __maybe_start_usb() {
+    __USBStart();
+}
+#endif

libraries/HID/HID.h

@@ -37,4 +37,9 @@ class HID_
 // https://isocpp.org/wiki/faq/ctors#static-init-order-on-first-use
 HID_& HID();
 
+#ifdef ARDUINO_SANTIAGO_COMPOSTA
+#undef Serial
+#define Serial SerialUSB
+#endif
+
 #endif //__HID_H__

variants/SANTIAGO_COMPOSTA/variant.cpp

@@ -100,7 +100,10 @@ void configure_usb_mux() {
 
 #include "FspTimer.h"
 
+__attribute__((weak)) void __maybe_start_usb() {}
+
 void initVariant() {
+  __maybe_start_usb();
   // bootloader configures LED_BUILTIN as PWM output, deconfigure it to avoid spurious signals
   pinMode(LED_BUILTIN, OUTPUT);
   //pinMode(LEDB, OUTPUT);