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Forum Index : Guest Book : CMM2 add functionality

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gwboyd
Newbie

Joined: 05/08/2020
Location: Australia
Posts: 3

Posted: 04:50am 05 Aug 2020

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This question must surely have been answered somewhere in the forum but I cannot find it so I will ask it here. If one wants to add a function to the firmware on the CMM2 (it is clearly stated that this is easy to do) what are the actual steps involved?? The section that describes this on the website follows :

Adding Functionality

MMBasic has a simple mechanism for adding functionality that is both elegant and efficient. This allows the easy addition of new commands, functions and operators.

For example, let us say that you want to implement a function that returns a special value generated by your hardware.

In one file you would define the C function to perform the operation:

void fun_myfun(void) {
fret = (float)special_data_to_return;
}

And in another file you insert the definition of your function into the function table. This links the function name in BASIC ("MyFunction") with the C function (fun_myfun):

{ "MyFunction", T_FNA | T_NBR, 0, fun_myfun },

MMBasic will do the rest and in your BASIC program you can use the function like any other:

PRINT MyFunction/100

This mechanism also applies to commands and even to arithmetic and string operators (ie, +, -, /, etc).

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