cpu/sam0_common/periph: fix rtt reset after hibernation #20842
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Platform: ARM
benpicco
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Aug 28, 2024
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I'm a bit confuse here. I understand the issue and what the fix is trying to do but you're fixing the RTT part of the driver while you use the RTC part. So far I was not able to reproduce the issue on SAME54 with |
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The issue is on rtt, so in order to see it you need to include the module |
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I think this PR needs a rebase so static-test will be happy. |
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Here we go ! |
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Thanks for the fix ! |
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Contribution description
This PR fixes the issue with rtt reset after a node hibernation
You may notice an issue when using the rtt_rtc module in any RIOT OS example. Specifically, if you use the rtc_gettime() function to get the current time, then set an alarm, put the node into hibernation, and finally retrieve the time again after the node wakes up, you will find that the time is incorrect after hibernation.
I encountered this issue while working with the gcoap example on the same54-xpro board. After adding the rtt_rtc module, I followed the steps mentioned above and observed that the time returned by rtc_gettime() after waking up from hibernation did not match the expected value.
Testing procedure
The output before the fix, you can notice the time after hibernation is wrong
This is the output after the fix: