nrf_rtc_timer: clear events and counter when disabling sys_clock
Clear pending IRQ when starting and restore back the RTC1 state when
disabling sys_clock, to avoid issues when soft rebooting the device or
chainloading another Zephyr image (e.g. mcuboot).
Change-Id: I693d9168196ad2cfb8475ecfa2051eac043b1fbd
Signed-off-by: Ricardo Salveti <ricardo.salveti@linaro.org>
diff --git a/drivers/timer/nrf_rtc_timer.c b/drivers/timer/nrf_rtc_timer.c
index 76c704d..a2575ff 100644
--- a/drivers/timer/nrf_rtc_timer.c
+++ b/drivers/timer/nrf_rtc_timer.c
@@ -292,6 +292,10 @@
SYS_CLOCK_RTC->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
SYS_CLOCK_RTC->INTENSET = RTC_INTENSET_COMPARE0_Msk;
+ /* Clear the event flag and possible pending interrupt */
+ RTC_CC_EVENT = 0;
+ NVIC_ClearPendingIRQ(NRF5_IRQ_RTC1_IRQn);
+
IRQ_CONNECT(NRF5_IRQ_RTC1_IRQn, 1, rtc1_nrf5_isr, 0, 0);
irq_enable(NRF5_IRQ_RTC1_IRQn);
@@ -325,9 +329,19 @@
*/
void sys_clock_disable(void)
{
+ unsigned int key;
+
+ key = irq_lock();
+
irq_disable(NRF5_IRQ_RTC1_IRQn);
+ SYS_CLOCK_RTC->EVTENCLR = RTC_EVTENCLR_COMPARE0_Msk;
+ SYS_CLOCK_RTC->INTENCLR = RTC_INTENCLR_COMPARE0_Msk;
+
SYS_CLOCK_RTC->TASKS_STOP = 1;
+ SYS_CLOCK_RTC->TASKS_CLEAR = 1;
+
+ irq_unlock(key);
/* TODO: turn off (release) 32 KHz clock source.
* Turning off of 32 KHz clock source is not implemented in clock
