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restore rp2040 sleep clocks after explicit light sleep #10018

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Jan 31, 2025
Merged

restore rp2040 sleep clocks after explicit light sleep #10018

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14 changes: 11 additions & 3 deletions ports/raspberrypi/common-hal/alarm/__init__.c
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,10 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj

mp_obj_t wake_alarm = mp_const_none;

// Save current clocks.
uint32_t saved_sleep_en0 = clocks_hw->sleep_en0;
uint32_t saved_sleep_en1 = clocks_hw->sleep_en1;

while (!mp_hal_is_interrupted()) {
RUN_BACKGROUND_TASKS;
// Detect if interrupt was alarm or ctrl-C interrupt.
Expand All @@ -163,21 +167,25 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
break;
}

// Prune the clock for sleep
// Prune the clocks for sleep.
clocks_hw->sleep_en0 &= RP_LIGHTSLEEP_EN0_MASK;
clocks_hw->sleep_en1 = RP_LIGHTSLEEP_EN1_MASK;

// Enable System Control Block (SCB) deep sleep
uint save = scb_hw->scr;
scb_hw->scr = save | M0PLUS_SCR_SLEEPDEEP_BITS;
scb_hw->scr |= M0PLUS_SCR_SLEEPDEEP_BITS;

__wfi();
}

// Restore clocks so other wfi() uses, like time.sleep(), won't use the light-sleep settings.
clocks_hw->sleep_en0 = saved_sleep_en0;
clocks_hw->sleep_en1 = saved_sleep_en1;

if (mp_hal_is_interrupted()) {
return mp_const_none; // Shouldn't be given to python code because exception handling should kick in.
}


alarm_reset();
return wake_alarm;
}
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