[ECOS] On RTC's isr!

[Robert Cragie]

Returning from the ISR with the Cyg_Interrupt::CALL_DSR flag set schedules
the DSR to be called. There is no need to explicitly call or schedule the
DSR.

I'm not sure about your second question, but there have been numerous posts
to this mailing list regarding real time clock ticks not working as expected
on certain platforms.

Robert Cragie, Design Engineer
________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
www.jennic.com  Tel: +44 (0) 114 281 2655


> -----Original Message-----
> From: ecos-discuss-owner@sources.redhat.com
> [mailto:ecos-discuss-owner@sources.redhat.com]On Behalf Of zhlg_shuhan
> Sent: 15 July 2002 04:14
> To: ecos-discuss@sources.redhat.com
> Subject: [ECOS] On RTC's isr!
>
>
> hi,all.
>    why  not RTC's isr call dsr_post()?
> then,how rtc's dsr() was called?
>
> cyg_uint32 Cyg_RealTimeClock::isr(cyg_vector vector, CYG_ADDRWORD data)
> {
> //    CYG_REPORT_FUNCTION();
>
> #if defined(CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY) &&
> defined(HAL_CLOCK_LATENCY)
>     if (measure_clock_latency) {
>         cyg_int32 delta;
>         HAL_CLOCK_LATENCY(&delta);
>         // Note: Ignore a latency of 0 when finding min_clock_latency.
>         if (delta > 0) {
>             // Valid delta measured
>             total_clock_latency += delta;
>             total_clock_interrupts++;
>             if (min_clock_latency > delta) min_clock_latency = delta;
>             if (max_clock_latency < delta) max_clock_latency = delta;
>         }
>     }
> #endif
>
>     CYG_INSTRUMENT_CLOCK( ISR, 0, 0);
>
>     HAL_CLOCK_RESET( CYGNUM_HAL_INTERRUPT_RTC,
> CYGNUM_KERNEL_COUNTERS_RTC_PERIOD );
>
>     Cyg_Interrupt::acknowledge_interrupt(CYGNUM_HAL_INTERRUPT_RTC);
>
> #if defined(CYGVAR_KERNEL_COUNTERS_CLOCK_DSR_LATENCY)
>     HAL_CLOCK_READ(&clock_dsr_start);
> #endif
>     return Cyg_Interrupt::CALL_DSR|Cyg_Interrupt::HANDLED;
> }
>
>
> and in rtc's dsr(),parameter count maybe >1,but when i check
> call_pending_DSRS(),i found count=1! why?
>
>
>                                                      zhlg
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