Bootloader shutdown after DFU instead of resetting

RE: Bootloader shutdown after DFU instead of resetting

Susheel Nuguru — Wed, 27 Mar 2019 06:20:46 GMT

Thanks for letting us know, this helps future developers with similar issues.

RE: Bootloader shutdown after DFU instead of resetting

ibrahim upright — Sun, 24 Mar 2019 13:44:35 GMT

Hi,

Never mind i used a pin that is not in use to create an interrupt before going to sleep .

Thanks a lot

Ibrahim

RE: Bootloader shutdown after DFU instead of resetting

ibrahim upright — Wed, 20 Mar 2019 10:48:00 GMT

Hi Susheel,
We have got to work on this and we can see that in order to use NRF_POWER->SYSTEMOFF = 0x1 we need to define a source for wake up.
However from the thread (devzone.nordicsemi.com/.../nrf52832-system-off-with-wake-on-reset) we can use one of the following interrupt:
GPIO , LPCOMP, NFC however we need to have an internal trigger so we need an interrupt that we can control (like a timer for example).
Which interrupt can we use to trigger an immediate reset after the move to low power mode, as we need it to create a "reset" for the system that will retain the GPIO state?

Thanks A lot

Ibrahim

RE: Bootloader shutdown after DFU instead of resetting

Susheel Nuguru — Thu, 18 Oct 2018 13:23:29 GMT

we do not call it off mode, but it is system off mode and seems like this is what you need.

The system is made to go to deep sleep mode by calling either

NRF_POWER->SYSTEMOFF = 0x1; //when softdevice is not enabled OR

sd_power_system_off(); //when softdevice is enabled.

a wakeup source needs to be configured before calling this and the wakeup will cause a system reset. This wakeup will not reset the GPIO registers so you will not see the pin status changing.

RE: Bootloader shutdown after DFU instead of resetting

danny habot — Thu, 18 Oct 2018 10:45:25 GMT

OK, so it should be possible to move the chip to off mode and then wake it up to reset?

Do you have an example how to do it?

RE: Bootloader shutdown after DFU instead of resetting

Susheel Nuguru — Thu, 18 Oct 2018 09:46:33 GMT

[quote user="danny-upright"]Does the NVIC_SystemReset change all the pins to logic "0"? if so why is it different from the way it works on the application side and can we change it to avoid changing the pins?[/quote]

Danny,

based on the below image you can see that the soft reset (NVIC_System reset) will reset the GPIO registers. So this should change all the logic to reset values before the configuration.

RE: Bootloader shutdown after DFU instead of resetting

danny habot — Wed, 17 Oct 2018 15:16:46 GMT

Hi Aryan,

We Are using LDO to regulate the system voltage which might be the cause for this.

It has an enable pin that is set to a logic "1" and my guess is that during the reset it falls and the system shutdown.

The reason it is weird for us is that we use the same function on the application and it does a reset correctly.

Does the NVIC_SystemReset change all the pins to logic "0"? if so why is it different from the way it works on the application side and can we change it to avoid changing the pins?

RE: Bootloader shutdown after DFU instead of resetting

Susheel Nuguru — Wed, 17 Oct 2018 14:37:18 GMT

[quote user=""]I tried to debug and saw that it reach the function bootloader_reset and run the NVIC_SystemReset function however it then shutdown. [/quote]

There is no shutdown feature in nRF chips, the closest is the System OFF mode and calling NVIC_system reset should not make it go into that mode. Are you sure that this behavior happens due to the call NVIC_SystemReset? I highly doubt it.