High Resolution Timer

[rooster]

How can I implement a higher resolution timer than the 1ms SDL_GetTicks ?

thanks,
rooster

 

[Mudi]

clock() in <time.h> has CLOCKS_PER_SEC per second, but I don't know what CLOCKS_PER_SEC is on GP2X.

EDIT: Don't use this, it returns the CPU time used by your program, not the system time. Use gettimeofday() to get microseconds instead.

 

[rooster]

thanks. hopefully clocks per sec is greater than 1000 for the GP2X.....

 

[Squidge]

If you look at hw addr 0xC0000A00, you can get a timer which increments approx 7,372,800 times per second

 

[rooster]

thanks for the info on the TCOUNT timer.

do you know of any code examples of people using it?
I would really appreciate any other tips or info you have on it. having read the magic eyes info I'm not sure if I would be able to set it up correctly but would like to try.

 

[Squidge]

rlyeh's sdk uses it, and provides easy to use functions for access to it.

http://www.emulnation.info/retrodev/

 

[Reesy]

rlyeh's sdk uses it, and provides easy to use functions for access to it.

http://www.emulnation.info/retrodev/

I've been using this timer but on the later firmwares I've started to have problems where the timer simply stops. Anyone else seen this? I've now changed my code to use

struct timeval tval;
gettimeofday(&tval, 0);

This appears to be stable.

 

[rooster]

thanks for your help guys