Cannot clear 'wake on GPIO' input sense pin

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Wed, 14 Mar 2018 20:31:02 GMT

Found the issue was in Makefile:

CFLAGS += -DCONFIG_GPIO_AS_PINRESET

and

ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Wed, 14 Mar 2018 18:43:59 GMT

The current error after wake from GPIO is:

On initial startup the first call to SOFTDEVICE_HANDLER_INIT subroutine has a variable called: power_clock_isr_enabled, which is false. On the wake from GPIO restart, the power_clock_isr_enabled is now true. I cannot find anywhere in the code where this is set to true. Is this a problem ? When its true it stops NVIC_DisableIRQ and then starts the NVIC_EnableIRQ, before the error happens. The Pushbutton is caught by the GPIOTE_IRQHandler. Any relationship ? The Pushbutton click is not getting to GPIOTE_IRQHandler due to the error causing trap and reset:

#ifndef DEBUG
NVIC_SystemReset();

Hope this helps.

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Wed, 14 Mar 2018 18:15:51 GMT

Is there a trick to starting the softdevice after a NRF_POWER->SYSTEMOFF = 0x1; ?

I would be OK with starting like a cold boot up, I am not preserving RAM.

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Wed, 14 Mar 2018 18:11:21 GMT

I stopped all timers using this call:

    app_timer_stop(pwr_off_id);
   app_timer_stop(g_blink_timer_id);
   app_timer_stop(m_sec_req_timer_id);
   app_timer_stop(m_battery_timer_id);
   app_timer_stop(norecs_off_id);

Which solves the above app_timer.c error. BUT now the error moved to this call in main.c :

SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

I am trying to find the cause in this subroutine SOFTDEVICE_HANDLER_INIT, which executes all its code OK, but then causes the error at completion of the call.

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Wed, 14 Mar 2018 16:48:30 GMT

RESETREAS reveals that there is an error causing the reset, the error is INVALID_STATE in app_timer.c timer create, line 991, for code which runs fine all the time before the error. We are not preserving RAM, but this looks like a resource problem.

I am using this code to mask errors, so the error is happening just after wake on GPIO.

    NRF_POWER->SYSTEMOFF = 0x1;
    // Use data synchronization barrier and a delay to ensure that no failure
    // indication occurs before System OFF is actually entered.
    __DSB();
    __NOP();

RE: Cannot clear 'wake on GPIO' input sense pin

Vidar Berg — Wed, 14 Mar 2018 13:15:34 GMT

You can use nrf_gpio_pin_latch_clear() to clear bits in the latch register, but I don't think it explains why you are getting a reset when the device is not in system OFF mode. Suggest to check the NRF_POWER->RESETREAS on startup to check what the reset source is. Note that the RESETREAS register is only reset through brown out and power on reset.

RE: Cannot clear 'wake on GPIO' input sense pin

dcollier8 — Mon, 12 Mar 2018 16:23:22 GMT

I tried the above suggestions (DEBUG and nrf_gpio_cfg_default()), they did not work. Meanwhile I got another suggestion from Patyush Dave:

the bit corresponding to the GPIO in the LATCH register needs to be reset by writing a ‘1’ to the bit.

BUT I do not know how to do the above suggestion.

Please provide sample code, and location of where to put the change, per the above suggestion.

RE: Cannot clear 'wake on GPIO' input sense pin

Vidar Berg — Mon, 12 Mar 2018 12:42:13 GMT

Hello,

A wakeup pin should only cause a reset when the device is in system OFF mode (Wakeup from System OFF mode reset). Is it possible that you are seeing a code assert once the button is presses in the app? Please add "DEBUG" to the list of pre-processor definitions and see if the program ends up in the app_error_handler() (actual handler name may be differ depending on SDK version)

Note that the pin must be configured with sense enabled if you are using PORT events to detect button presses. nrf_gpio_cfg_default() can be used to configure a pin back to its reset state.