The RTC driver topic

[Giovanni]

Fix committed, thanks.

Giovanni

[barthess]

Hi Giovanni
I want to change function prototype from

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void rtcConvertDateTimeToStructTm(const RTCDateTime *timespec,
                                  struct tm *timp)

to

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void rtcConvertDateTimeToStructTm(const RTCDateTime *timespec,
                                  struct tm *timp, 
                                  uint32_t *tv_msec)

to be able to obtain fractional seconds part.
Is it possible in trunk?

[Giovanni]

Sure go ahead, just make sure both implementations work with the change.

Note that I wish to do a "preview" 3.0 release during the weekend.

Giovanni

[barthess]

What the second implementation you talking about? I want to improve just a single function
rtcConvertDateTimeToStructTm from RTC HAL realization.

[Giovanni]

I thought low level drivers were impacted, this is not the case.

Giovanni

[Chudik]

Did I understand correctly that this driver does not initialize which clock should be used for the RTC?
STM32L1 family has internal 37kHz generator, I would like to is it instead of the External 32kHz clock

[Giovanni]

Hi,

Clock settings are all in mcuconf.h in the clocks section.

Giovanni

[Chudik]

Hmm... LSI in mcuconfig.h is enabled by default.
HAL_USE_RTC in halconf.h I set to TRUE

That means RTC should work and rtcInit() should pass, but it does not.
It stops in rtc_lld_init() at calling

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  /* If calendar not init yet. */
  if (!(RTC->ISR & RTC_ISR_INITS)){
    rtc_lld_enter_init();   // <----------- stops here
....
}

If I try to make a step over the function or into it, the system hangs.

What could be the problem?

[Giovanni]

Probably the oscillator is not starting at all, it is very critical, see application notes.

Giovanni

[Chudik]

Found what was the problem.
in mcuconf.h by default set
#define STM32_RTCSEL STM32_RTCSEL_LSE
while by default we have
#define STM32_LSI_ENABLED TRUE
#define STM32_LSE_ENABLED FALSE

When I changed
#define STM32_RTCSEL STM32_RTCSEL_LSI
RTC initialization went successfully.

Found that after switching from 2.6.7 to 2.6.8, because it gave error that wrong setting used.
Probably would be useful to have

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#if (STM32_LSI_ENABLED)
   #define STM32_RTCSEL                        STM32_RTCSEL_LSI
#elif (STM32_LSE_ENABLED)
   #define STM32_RTCSEL                        STM32_RTCSEL_LSE
#endif