Transferring data between objects

Lucky

Hi, I am new to the propeller and· I· am not use to the spin language. I was wondering how one goes about transferring data such as a variable from one object to another? Do you use the DAT command to write it to main memory? Can anyone post some code where one object refers to another object's method and then returns a value to the caller object?

Mike Green

Let's say you have a main program called mainprog.spin and that program has an object declaration in it like 'OBJ lower : "myObject"'. Let's say you have a variable in 'myObject' called 'important' which is declared like 'VAR long important'. The easiest way to refer to this variable in your main program is to define two methods in 'myObject' like this:

PUB getImportant
   return important

PUB setImportant(value)
   important := value

You can then get the value of 'important' by writing 'lower.getImportant' and you can set the value of 'important' to 6 by doing something like 'lower.setImportant(6)'

Similar things can be done with other variables which can be longs, words or bytes. You can also create a method in 'myObject' that returns the address of a variable and use that in your main program to reference the variable.

Lucky

Thank you so much for the quick and easy to understand reply.

Sariel

This is simple enough, and I have this working ok for passing numeric data, but is there a way of passing text as a variable from object to object? I'm sure that it is not going to be as easy as I would like it to be. The reason for this is I am trying to design a cable tester, and I would like one configuration object containing Rev numbers, assembly numbers, and connection data all in one simple to modify file so that I don't have to muck with modifying the base source code when it comes time to program this device for a different assembly.