SOLVED : How does HardwareSerial.h know what RAMEND is ?

noweare · April 8, 2017, 2:52am

I do not understand how HardwareSerial.h knows what RAMSTART and RAMEND is because that is in iom328p.h file which is not included in HardwareSerial.h, neither is "avr/io.h" which includes "iom328p.h" (for my chip). avr/io.h is included in my *.ino file but that would not expose whats in "iom328.p" to HardwareSerial.h.

So, how is RAMSTART, RAMEND known to HardwareSerial.h ?

Thanks

pert · April 8, 2017, 5:32am

Arduino.h includes HardwareSerial.h after including avr/io.h:

github.com

arduino/Arduino/blob/1.8.2/hardware/arduino/avr/cores/arduino/Arduino.h#L29


      
          
          
#ifndef Arduino_h
          #define Arduino_h
          
          
#include <stdlib.h>
          #include <stdbool.h>
          #include <string.h>
          #include <math.h>
          
          
#include <avr/pgmspace.h>
          #include <avr/io.h>
          #include <avr/interrupt.h>
          
          
#include "binary.h"
          
          
#ifdef __cplusplus
          extern "C"{
          #endif
          
          
void yield(void);

The include of Arduino.h is automatically added to the sketch during the build process.

oqibidipo · April 8, 2017, 5:44am

HardwareSerial.h does eventually include avr/io.h through this chain:

HardwareSerial.h
Stream.h
Print.h
WString.h
avr/pgmspace.h
avr/io.h

noweare · April 8, 2017, 12:26pm

Ok, thanks guys.

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SOLVED : How does HardwareSerial.h know what RAMEND is ?

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