Arduino class HWSerial' has no member named 'read'

Question

I am using the GSMSHIELD library with an Arduino Mega and I am getting the following error on two different systems.

/Users/-----/Documents/Arduino/libraries/GSMSHIELD/SIM900.cpp: In member function 'int SIMCOM900::configandwait(char*)': /Users/-----/Documents/Arduino/libraries/GSMSHIELD/SIM900.cpp:62:18: error: 'class HWSerial' has no member named 'read' connCode=_cell.read();

I can trace this back through the GSM.h file:

#include "HWSerial.h"
...

HWSerial _cell;

and the Arduino HardwareSerial.h file:

  public:
inline HardwareSerial(
  volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
  volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
  volatile uint8_t *ucsrc, volatile uint8_t *udr);
void begin(unsigned long baud) { begin(baud, SERIAL_8N1); }
void begin(unsigned long, uint8_t);
void end();
virtual int available(void);
virtual int peek(void);
virtual int read(void);
<snip>

I can't for the life of me figure out why this won't compile, unless it's an Arduino development system version (1.6.9) issue...

I don't find any info on which versions of the IDE the library was written/tested on.

Any ideas?

Distributions aka "boards" can have totally different kernel of arduino, for example String without c_str() etc. Such cases have very similar image like Your problem. Source You see, probably isn't in working set. — Jacek Cz
Yes, I understand that. But this library is made for either Uno or Mega, controlled by an #ifdef, so it's supposed to work with this board. It works for the Uno, but that uses software serial, I want to use the Mega's hardware serial. That is why I thought it might be a version issue... — Arana
No, I didn't. This was shortly before the project fell apart. I also noticed that the library seemed to be untouched for some time now. I think the owner has abandoned it and it needs to be updated to match the latest version of the IDE and associated libraries. If I get back to it the spring, and find a solution, I will post it here. Otherwise, let me know if you get anywhere with it. — Arana

CallMeLaNN CallMeLaNN · Accepted Answer · 2016-12-05T20:46:18

Make sure you uncomment the first line in HWSerial.h from //#define MEGA to #define MEGA

There are two places for you to uncomment the define in order for you to use Mega instead of Uno board. That is in GSM.h and HWSerial.h!

Arduino class HWSerial' has no member named 'read'

1 Answers