About DPitt.2

DPitt.2 · 2023-04-24

Hi,I'm having some trouble with trying to correct the RTC drift on a STM32F439NIHx. I've enabled the REF_IN and provided a 50Hz signal on the pin, but the RTC still drifts by around 1s per day.I've also tested that the 50Hz signal is correctly receiv...

DPitt.2 · 2023-04-26

It was indeed the GPIO_InitStruct.Mode = GPIO_MODE_INPUT; that was wrong.The setup is running now for two days with GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; and the time hasn't drifted.Thanks a lot for the help.DP

DPitt.2 · 2023-04-25

I checked and the code I have is doing mostly the same things, with the difference of GPIO_InitStruct.Mode = GPIO_MODE_INPUT; instead of GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; The test for this correction is running, but it takes 1-2 days to be sure...

DPitt.2 · 2023-04-25

I don't use Cube, so I'm not sure how the code generation works, but the GPIO init is probably somewhere. Still, as waclawek.jan said, the GPIO mode I had was INPUT while your screenshot shows it in Alternate, so I'm redoing the test with it in GPIO_...

DPitt.2 · 2023-04-24

I think we'd already tested with GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; before and the drift was the same.for GPIO_InitStruct.Alternate = GPIO_AF0_RTC_50Hz; it doesn't change anything since its default value is already 0.I'll restart a test with GPI...

DPitt.2 · 2023-04-24

The 50Hz signal I use for the REF_IN is indeed provided by an atomic clock.

User statistics

User Activity

Issue with the RTC REF_IN on STM32F439NIHx

Re: Issue with the RTC REF_IN on STM32F439NIHx

Re: Issue with the RTC REF_IN on STM32F439NIHx

Re: Issue with the RTC REF_IN on STM32F439NIHx

Re: Issue with the RTC REF_IN on STM32F439NIHx

Re: Issue with the RTC REF_IN on STM32F439NIHx