[En-Nut-Discussion] EVK1100 Timing Problem

[Philippgl2]

Hi,

I found the reason for the Timing Problem in a Thread from two years ago by
Daniel Fiedler:



DanielFiedler wrote
> Hello,
> 
> i have read back the PLL Control register of PLL0:
> 
> It's hex value: 0x10 0x09 0x01 0x0D
> 
> PLLMUL is set to 9
> PLLDIV is set to 1
> 
> PLLOPT[0] uses 80 ... 180MHz range
> PLLOPT[1] selects f(pll) = f(vco)/2
> 
> With these options f(pll) is calculated:
> f(vco)= ( 9 + 1 ) / 1 * f(osc) = 120MHz
> f(pll) = 60MHz
> 
> Seems to be correct.
> 
> In file /nut/arch/avr32/dev/ostimer.c I found this function.
> 
> void NutRegisterTimer(void (*handler) (void *))
> {
>     /* Set compare value for the specified tick frequency. */
> //    Set_system_register(AVR32_COMPARE, NutGetCpuClock() / NUT_TICK_FREQ
> + Get_system_register(AVR32_COUNT));
>         Set_system_register(AVR32_COMPARE, NutGetCpuClock() /
> NUT_TICK_FREQ );
> 
>     sig_sysCompare.ir_handler = handler;
> 
>     register_interrupt(SystemCompareIrqEntry, AVR32_CORE_COMPARE_IRQ,
> AVR32_INTC_INT0);
> }
> 
> I changed line 4 in line 5. Now system seems to run at the correct speed.
> But Nut/os needs about 15-20s for boot/init.
> 
> Could someone explain this function?
> 
> 
> Best regards
> Daniel 


The Problem with the 20secs bootup delay stays... 
I wanted to ask if there is any solution today?

Kind Regards
Philippgl



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