SYS/BIOS Timers

michael burke79518

Other Parts Discussed in Thread: SYSBIOS

I have set up a timer in SYS/BIOS which periodically calls a function (mytimer0) in my code. This seems to work well, but when I create a new timer to call another function (mytimer1) I get an error that says "HWI 14 already in use by (by &mytimer0)". Can I use two different timers using the Timer Manager? If So how can I set up two timers in SYS/BIOS without getting an error like this?

over 14 years ago

0 Shreyas Oppanthaya over 14 years ago

Genius 4375 points

Hi Michael,

Which device & which version of BIOS are you using?

Regards,

Shreyas

0 michael burke79518 over 14 years ago in reply to Shreyas Oppanthaya

Intellectual 400 points

Hi, I;m using a C6678 evaluation board. I am alos using BIOS version 6.32.02.39

0 judahvang over 14 years ago

TI__Mastermind 32475 points

Michael,

On the C6678, each core contains only 1 local Timer and then there are 8 shared timers. By default the Timer0 is used by Core0 for the SYSBIOS Clock. If you want to create another Timer on Core0 you will need to use one of the Shared timers (Timers #8-15). What I'm saying is, don't try to create Timer1-Timer7 for Core0.

Now the error that you are seeing above is a result of SYSBIOS defaulting all the local timers on each core to use the same Hwi interrupt vector 14. This default Hwi interrupt vector assignment can also be specified when you create an instance of the Timer by changing the 'intNum' parameter.

Judah

0 michael burke79518 over 14 years ago in reply to judahvang

Intellectual 400 points

thanks very helpful

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SYS/BIOS Timers