Re: Trouble with Timers on the ARM

[William Thomas <williamjthomas7777@gmail.com>]

On Wednesday, August 13, 2014 12:53:17 PM UTC-4, Mike Silva wrote:
> I've connected an STM32F4 board to an LCD display, and modified the last chance handler to print out the offending file and line number.  Your code fails in
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> s-taprob.adb   line 95
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> which is here:
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>       if Caller_Priority > Object.Ceiling then
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>          raise Program_Error;
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>       end if;
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> Sorry, don't have the time now to dig deeper.
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> Mike

Thanks Mike,

I got the last chance handler to print out the Null terminated string returned at address along with the line number. Sure enough I received the same message coming from System.Tasking.Protected_Objects.

It turns out that I had to set the protected object's priority to System.Max_Interrupt_Priority in order for the timer to work properly.

I would imagine its because the Callback is being called back by something that was being executed as a result of some processor timer which I believe would have to be coming in at Max_Interrupt_Priority.

Thanks for the help.

Bill