making my library arduino1.0 compatible.

Projects Programming
1

Hello,
I am trying to make my library arduino1.0 compatible,
But I can't figure out why it's not working.

first problem I have and I don't know if it's a real problem though :
in function IOlcd:: write()
I have Wire.print but when I'd want to change this to Wire.write give's me an error:

/home/robert/sketchbook/libraries/IOlcd/IOlcd.cpp: In member function ‘virtual size_t IOlcd::write(uint8_t)’:
/home/robert/sketchbook/libraries/IOlcd/IOlcd.cpp:203: error: call of overloaded ‘write(int)’ is ambiguous
/home/robert/arduino-1.0/libraries/Wire/Wire.h:55: note: candidates are: virtual size_t TwoWire::write(uint8_t)
/home/robert/arduino-1.0/hardware/arduino/cores/arduino/Print.h:49: note:                 size_t Print::write(const char*)

I do not understand what is happening here?
Second problem,
The sketch compiles and when i use Example code:

//include the nesecary header files for this to work.
#include <IOlcd.h>
#include <Wire.h>;

IOlcd lcd;
long count = 1;

int initvalue;

void setup(){
  //initialize the chip(in this case MCP23016) at address 0x20
  initvalue = lcd.init(0x20, MCP23016);
  //start the lcd
  lcd.begin(16,2);
  //at the begining of the first line.
  lcd.home();
  //clear lcd just incase.
  lcd.clear();
  //print hello world to the first line.
  lcd.print("Hello, World!");
}

void loop(){
  //set cursor to the second line.
  lcd.setCursor(0,1);
  //number of seconds active, is printed.
  lcd.print(count);
  count++;
  delay(1000);
}

Doesn't display, so I serial print value returned by lcd.init();
and that's 1, so it must be working, atleast first function.

So I hope you can help me out with this :slight_smile:
Greetings,
Duality

ps. doesn't let me upload so here a link to source:
http://www.mediafire.com/?oob5c7emljdug9u

2

The message is telling you exactly what the problem is. You are calling the write() method, which has several overloads, but none of them exactly match the argument type you are supplying. You must cast the argument to one of the types that the compiler expects - either uint8_t (byte) or const char *. Most likely, it is the first one that you want to use.

Wire.write((byte)xxx), where xxx is the value to output.

3

want to thank you sooo much :slight_smile:
been cracking my head over it for a few days now, that i did not see it.
now I know, and i'll remember,
thank you so much again :slight_smile:

Greetings,
Duality