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Sep 21, 2025
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In Embassy, interrupts are commonly used to extend counter size by incrementing a variable on each event. This approach is mostly relevant for general-purpose timers.
For the RTC, however, this extension is unnecessary. On ST chips, the RTC is already implemented with two cascaded counters: the RTC clock (RTC_CLK) feeds the prescaler counter (TR_CLK), which on overflow increments the RTC counter (RTC_CNT). Together, they provide a 52-bit counter.
This driver does not take advantage of the full 52 bits, since even the RTC_CNT counting in seconds would take many years to overflow.
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RTC and GP-Timer time driver for the STM32F1xx
Bug fix: