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@jepler jepler commented Mar 10, 2021

Until a time is set, the RTC is not running, and rtc_get_datetime() returns false without assigning to the out-parameter.

In CircuitPython, this would manifest as arbitrary values being returned by rtc.RTC().datetime, since uninitialized storage on the stack was being converted into a timestamp.

After this change, the RTC starts on January 1, 2020. I think this is the same epoch as the other ports.

tannewt
tannewt previously approved these changes Mar 11, 2021
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Thanks! Just needs make translate

Until a time is set, the RTC is not running, and rtc_get_datetime()
returns false without assigning to the out-parameter.

In CircuitPython, this would manifest as arbitrary values being returned,
since uninitialized storage on the stack was being converted into a timestamp.
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jepler commented Mar 11, 2021

@tannewt I had to update the branch so I'll need a re-review. thank you!

@jepler jepler requested a review from tannewt March 11, 2021 02:49
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Thanks! @jepler. I am wondering if this will fix #4260.

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jepler commented Mar 11, 2021

@microdev1 I don't know, I would think that after set_time_source, this routine wouldn't be used anymore. I could be wrong.

@jepler jepler merged commit 15e97f1 into adafruit:main Mar 11, 2021
@jepler jepler deleted the rp2040-rtc branch November 3, 2021 21:10
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3 participants