RE: Application hangs after jumping to different application (RTC1_IRQHandler)

Sigurd — Thu, 27 Jan 2022 16:55:50 GMT

Hi,

I assume you still have the RTC running when you jump to the other application. I suggest stopping it before you jump to the other application.

nrf_rtc_task_trigger(portNRF_RTC_REG, NRF_RTC_TASK_STOP);
nrf_rtc_task_trigger(portNRF_RTC_REG, NRF_RTC_TASK_CLEAR);

PS: If you run into any issues with the SD API calls, then you need to remember to enable forwarding of interrupts to the Softdevice by calling nrf_dfu_mbr_init_sd().

Edit:

The problem could be that RTC1->INTENSET = SYSTICK in the bootloader, and the app is started with this bit still set. So when FreeRTOS started up its scheduler, and enabled RTC1 IRQ, then SYSTICK interrupt would trigger in addition to COMPARE0. This line nrf_rtc_int_disable(portNRF_RTC_REG, NRF_RTC_INT_TICK_MASK), then fixed that.

RE: Application hangs after jumping to different application (RTC1_IRQHandler)

kcl74 — Thu, 27 Jan 2022 16:46:32 GMT

I think because FreeRTOS uses the RTC (configTICK_SOURCE == FREERTOS_USE_RTC), it enables the RTC1_IRQHandler interrupts at startup, and because the RTC interrupt is pending it prevents me from jumping. Does this sound correct?

I'm assuming this is the only "setup" interrupt that is enabled since the SoftDevice isn't enabled until after the Application1 tries to jump to Application2. SoftDevice is enabled in Application1 only if Application1 doesn't want to jump to Application2.

I don't think FreeRTOS (out-of-the-box) enables any other interrupts during startup, but can anyone verify this?