[ECOS] RE: Re: How to set clock related options?

[Savin Zlobec]

caocangmou wrote:

>But, I got a configuration from template(Akizuki H8/3068) :
>           Real-time clock numerator : 1000000000
>           Real-time clock denominator : 100
>           Real-time clock base prescale : 8192 
>           Real-time clock period :10
>           OSC/Clock Frequency :20000000
>It seems not the case .What does period really mean?
>
CYGNUM_KERNEL_COUNTERS_RTC_PERIOD which defaults to  
CYGNUM_HAL_RTC_PERIOD is
used to initialize you system clock hardware. Ecos tick is usually 
implemented with a  hw timer which gives
periodic interrupts. The  CYGNUM_HAL_RTC_PERIOD is calculated so that 
you get an interrupt every
10ms (the default) and it depends on your timer hardware. Changing the 
tick requires setting the
CYGNUM_HAL_RTC_NUMERATOR, CYGNUM_HAL_RTC_DENOMINATOR and
CYGNUM_HAL_RTC_PERIOD (if it is not automatically calculated from the 
previous two - look how it is
calculated in cdl - it can only depend on your frequency - in that case 
it is probably set to 10ms).

savin


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