Add define to enable/disable all debug printing

USBHost.h

 
 #include <stdint.h>
 
+#define USBHOST_PRINT_DEBUG
+
 /************************************************/
 /*  Data Structure Definitions                  */
 /************************************************/
 		uint32_t maxlen, uint32_t interval);
 	static void add_qh_to_periodic_schedule(Pipe_t *pipe);
 protected:
+#ifdef USBHOST_PRINT_DEBUG
 	static void print(const Transfer_t *transfer);
 	static void print(const Transfer_t *first, const Transfer_t *last);
 	static void print_token(uint32_t token);
 		Serial.print(s); Serial.println(n, b); }
 	static void println(const char *s, unsigned long n, uint8_t b) {
 		Serial.print(s); Serial.println(n, b); }
+#else
+	static void print(const Transfer_t *transfer) {}
+	static void print(const Transfer_t *first, const Transfer_t *last) {}
+	static void print_token(uint32_t token) {}
+	static void print(const Pipe_t *pipe) {}
+	static void print_driverlist(const char *name, const USBDriver *driver) {}
+	static void print_qh_list(const Pipe_t *list) {}
+	static void print_hexbytes(const void *ptr, uint32_t len) {}
+	static void print(const char *s) {}
+	static void print(int n) {}
+	static void print(unsigned int n) {}
+	static void print(long n) {}
+	static void print(unsigned long n) {}
+	static void println(const char *s) {}
+	static void println(int n) {}
+	static void println(unsigned int n) {}
+	static void println(long n) {}
+	static void println(unsigned long n) {}
+	static void println() {}
+	static void print(uint32_t n, uint8_t b) {}
+	static void println(uint32_t n, uint8_t b) {}
+	static void println(const char *s, int n) {}
+	static void println(const char *s, unsigned int n) {}
+	static void println(const char *s, long n) {}
+	static void println(const char *s, unsigned long n) {}
+	static void println(const char *s, int n, uint8_t b) {}
+	static void println(const char *s, unsigned int n, uint8_t b) {}
+	static void println(const char *s, long n, uint8_t b) {}
+	static void println(const char *s, unsigned long n, uint8_t b) {}
+#endif
 
 	static void mk_setup(setup_t &s, uint32_t bmRequestType, uint32_t bRequest,
 			uint32_t wValue, uint32_t wIndex, uint32_t wLength) {

ehci.cpp

 
 void USBDriverTimer::start(uint32_t microseconds)
 {
+#ifdef USBHOST_PRINT_DEBUG
 	Serial.print("start_timer, us = ");
 	Serial.print(microseconds);
 	Serial.print(", driver = ");
 	Serial.print((uint32_t)driver, HEX);
 	Serial.print(", this = ");
 	Serial.println((uint32_t)this, HEX);
+#endif
 	if (!driver) return;
 	if (microseconds < 100) return; // minimum timer duration
 	started_micros = micros();

print.cpp

 #include <Arduino.h>
 #include "USBHost.h"
 
+#ifdef USBHOST_PRINT_DEBUG
 
 void USBHost::print(const Transfer_t *transfer)
 {
 	Serial.println();
 }
 
+#endif