[ECOS] Cortex-M1/3 SysTick/RTC

[simon.kallweit@intefo.ch]

Andrew Lunn wrote:
>> Yes, I will use the SysTick for the real time clock source, moving this  
>> to the architecture. So there will be no need to define this in new  
>> variants and platforms. We probably should provide macros for overriding  
>> though?!?
>>     
>
> That is easy to do. The porting guide says the official interface is:
>
> HAL_CLOCK_INITIALIZE( period )
> HAL_CLOCK_RESET( vector, period )
> HAL_CLOCK_READ( pvalue )
>
> So you can include var_io.h or plf_io.h first and then do:
>
> ifndef HAL_CLOCK_INITIALIZE( period )
> #define HAL_CLOCK_INITIALIZE cyg_cortex_clock_init( (period))
> #endif
>
> etc...
>   

Ok, moving the clock source to the architecture, we need a way to define 
the frequency of the SysTick clock source, which is implementation 
defined. Can we do this using a CDL interface, requiring the cortex 
variants to provide the SysTick clock frequency? Otherwise we'd have to 
move the clock functions back to the variant.

Simon



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