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Clear GPREGRET before setting

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There are some troubles with that register:
it is recommended to clear it with 0xFF mask
and only after that perform a setting.
This commit is contained in:
MagnusKos 2025-07-21 18:40:24 +03:00
parent 43a1976f6d
commit 61e60c974d
1 changed files with 1 additions and 0 deletions
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src/platform/nrf52/main-nrf52.cpp
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@ -366,6 +366,7 @@ void cpuDeepSleep(uint32_t msecToWake)
// Resume on user button press
// https://github.com/lyusupov/SoftRF/blob/81c519ca75693b696752235d559e881f2e0511ee/software/firmware/source/SoftRF/src/platform/nRF52.cpp#L1738
constexpr uint32_t DFU_MAGIC_SKIP = 0x6d;
sd_power_gpregret_clr(0, 0xFF); // Clear the register before setting a new values in it for stability reasons
sd_power_gpregret_set(0, DFU_MAGIC_SKIP); // Equivalent NRF_POWER->GPREGRET = DFU_MAGIC_SKIP
// FIXME, use system off mode with ram retention for key state?