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CHell · 2019-02-26

We have a driver for the RTC which I am trying to enhance with sub-second resolution.I am testing with a tight loop which is repeatedly reading the time. First I am reading the SSR register (which should 'lock' TR and DR?) then the TR, then DR (to 'u...

CHell · 2019-03-01

Ok, I re-worked this a bit, but something is still going wrong somewhere. PreDiv_S = 255, by the way.As below is how the function would ideally be [of it worked lol] - but uncommenting the commented sections demonstrates that the value of TR is incre...

CHell · 2019-03-01

The printf inside the loop is just to show the value of TR whilst SSR=255.Re "the second read to SSR would lock TR" - was thinking that the erratum is that it might not lock TR??But I take your point about reading DR again to ensure an unlock before...

CHell · 2019-03-01

Well I certainly needed to know about that erratum - thanks. But even correcting for this, I still see the problem. I think this piece of code demonstrates it: uint32_t temp_tr, temp_sr, temp_dr, roll = 0; do { RTCRegisters_m->RTC_ISR.Set(RT...

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Using subseconds register on STM32F7 RTC

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