Random number generator

[dvwagner]

Does anybody know how to generate a random number in Flowcode?

[Steve]

This thread may help:
http://www.matrixmultimedia.com/mmforum ... ndom#p7442

[dvwagner]

I don't think I know enough C to make sense of the example. Is there more of the code that is not in the example?

[Steve]

Yes - it's not quite complete.

First, follow the instructions in the 2nd post in that topic. (i.e. "#include <rand.h>" into supplementary code window and "rand.pic16.lib" into the linker parameters).

This exposes 2 C functions - "srand" (the pseudo random number seed) and "rand" (the function that actually creates the pseudo-random number).

In your Flowcode program, you would begin your routine with a C-icon containing something like this:

Code: Select all

srand(100);

And to set a Flowcode variable "MyVar" to a random number, use a C-icon with this code:

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FCV_MYVAR = rand();

Note that this program will not simulate because Flowcode cannot simulate C code. You will only see the random numbers when running on the PICmicro.

[Steve]

Another way to generate a random number is shown in the attached program.

While the user holds down a switch, a counter is incremented. When the switch is released, the random number is displayed. The "rnd = rnd MOD 100" makes sure the random number stays between 0 and 100.

[wtulp]

Thanks

It works very fine now.