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cpu/nrf5x/timer: fix high current consumption in powered off state #18953

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Nov 23, 2022
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cpu/nrf5x/timer: fix high current consumption in powered off state #18953

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24 changes: 23 additions & 1 deletion cpu/nrf5x_common/periph/timer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -165,7 +165,29 @@ void timer_start(tim_t tim)

void timer_stop(tim_t tim)
{
dev(tim)->TASKS_STOP = 1;
/* Errata: [78] TIMER: High current consumption when using
* timer STOP task only
*
* # Symptoms
*
* Increased current consumption when the timer has been running and the
* STOP task is used to stop it.
*
* # Conditions
* The timer has been running (after triggering a START task) and then it is
* stopped using a STOP task only.
*
* # Consequences
*
* Increased current consumption.
*
* # Workaround
*
* Use the SHUTDOWN task after the STOP task or instead of the STOP task
*
* cf. https://infocenter.nordicsemi.com/pdf/nRF52833_Engineering_A_Errata_v1.4.pdf
*/
dev(tim)->TASKS_SHUTDOWN = 1;
}

static inline void irq_handler(int num)
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