GP32 Correct Use Of Cpu_setspeed

[pea]

Hi all,

Does the call to cpu_setSpeed have to be right at the start? Can it be called multiple times throughout the running of the program without doing anything nasty?

Reason I ask is because I want to load a ini file off the smc, and then set the CPU speed based on whats in there...

Cheers,
Pea

 

[don]

From my experience, you can set the clockspeed multiple times during a program, but you should set a basic CPU speed right at the program startup. I'm not really sure, but I *think* you would use the cpu speed of your launcher without (not really sure about that, I think the 66mhz is a standard frequency set by GPSDK, Mirko's doesn't set a standard freq).

HTH

 

[pea]

Thanks don,

As long as I can set the CPU speed again later, I don't mind setting it right at the start as well. I can only test using geepee emulator because I don't have my GP32 yet (about a month)

Cheers,
Pea

 

[generalnmx]

Mirko does set a "standard frequency" at 44MHz. It's in his version of gpstart.c. If you don't set the clock, then it will use the frequency from the BIOS - usually 66MHz, except for Pacrom which is 33MHz.

You don't have to worry about setting the clock speed repeatedly. Some programs even make use of higher clock speeds for cpu-intensive processes, like GPFM when it reads an image.

 

[pea]

Thanks for the info. Thats good to know, and very clever of GPFM

 

[don]

Mirko does set a "standard frequency" at 44MHz. It's in his version of gpstart.c.

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What gpstart.c? I can't see anything that's run automatically just by adding his libs to a project. Neither can I find a reference to 44mhz. Is it me or you?