Move analog_pin_to_channel to main Arduino.h

Author: facchinm

cores/arduino/Arduino.h

@@ -90,6 +90,7 @@ extern const uint8_t digital_pin_to_port[];
 extern const uint8_t digital_pin_to_bit_mask[];
 extern const uint8_t digital_pin_to_bit_position[];
 extern const uint8_t digital_pin_to_timer[];
+extern const uint8_t analog_pin_to_channel[];
 
 // Get the bit location within the hardware port of the given virtual pin.
 // This comes from the pins_*.c file for the active board configuration.
@@ -155,5 +156,12 @@ bool isDoubleBondedActive(uint8_t pin);
 
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include "pins_arduino.h"
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif

cores/arduino/wiring_analog.c

@@ -23,7 +23,6 @@
 */
 
 #include "wiring_private.h"
-#include "pins_arduino.h"
 #include "Arduino.h"
 
 uint8_t analog_reference = DEFAULT;

variants/nona4809/pins_arduino.h

@@ -273,7 +273,6 @@ const uint8_t analog_pin_to_channel[] = {
 
 #endif
 
-extern const uint8_t analog_pin_to_channel[];
 #define digitalPinToAnalogInput(p)  ((p < ANALOG_INPUT_OFFSET) ? analog_pin_to_channel[p] : analog_pin_to_channel[p - ANALOG_INPUT_OFFSET] )
 
 // These serial port names are intended to allow libraries and architecture-neutral