Add KNX_NO_PRINT to define in project to avoid console info and reduce footprint (#127)

src/arduino_platform.cpp

@@ -112,6 +112,7 @@ int ArduinoPlatform::readWriteSpi(uint8_t *data, size_t len)
     return 0;
 }
 
+#ifndef KNX_NO_PRINT
 void printUint64(uint64_t value, int base = DEC)
   {
     char buf[8 * sizeof(uint64_t) + 1];
@@ -284,3 +285,4 @@ void println(void)
 {
     ArduinoPlatform::SerialDebug->println();
 }
+#endif // KNX_NO_PRINT

src/cc1310_platform.cpp

@@ -134,6 +134,7 @@ void delayMicroseconds (unsigned int howLong)
     ClockP_usleep(howLong);
 }
 
+#ifndef KNX_NO_PRINT
 size_t write(uint8_t c)
 {
 #if defined(PRINT_UART)
@@ -402,6 +403,7 @@ void println(double num)
     // default: print 10 digits
     println(num, 10);
 }
+#endif // KNX_NO_PRINT
 
 uint32_t digitalRead(uint32_t dwPin)
 {

src/knx/bits.cpp

@@ -8,6 +8,7 @@ const uint8_t* popByte(uint8_t& b, const uint8_t* data)
     return data;
 }
 
+#ifndef KNX_NO_PRINT
 void printHex(const char* suffix, const uint8_t *data, size_t length, bool newline)
 {
     print(suffix);
@@ -21,6 +22,7 @@ void printHex(const char* suffix, const uint8_t *data, size_t length, bool newli
         println();
     }
 }
+#endif
 
 const uint8_t* popWord(uint16_t& w, const uint8_t* data)
 {

src/knx/bits.h

@@ -63,6 +63,7 @@ typedef void (*voidFuncPtr)(void);
 void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode);
 #endif
 
+#ifndef KNX_NO_PRINT
 void print(const char[]);
 void print(char);
 void print(unsigned char, int = DEC);
@@ -87,6 +88,11 @@ void println(double);
 void println(void);
 
 void printHex(const char* suffix, const uint8_t *data, size_t length, bool newline = true);
+#else
+#define print(...)      do {} while(0)
+#define println(...)    do {} while(0)
+#define printHex(...)   do {} while(0)
+#endif
 
 const uint8_t* popByte(uint8_t& b, const uint8_t* data);
 const uint8_t* popWord(uint16_t& w, const uint8_t* data);

src/linux_platform.cpp

@@ -502,6 +502,7 @@ void LinuxPlatform::setupUart()
     }
 }
 
+#ifndef KNX_NO_PRINT
 void printUint64(uint64_t value, int base = DEC)
   {
     char buf[8 * sizeof(uint64_t) + 1];
@@ -708,6 +709,7 @@ void println(void)
 {
     printf("\n");
 }
+#endif // KNX_NO_PRINT
 
 void pinMode(uint32_t dwPin, uint32_t dwMode)
 {