I'm trying to put the nRF9160 into System Off mode and am getting a bus fault error when writing to the REGULATORS module. This is the error output:
***** BUS FAULT ***** Precise data bus error BFAR Address: 0x40004500***** Hardware exception *****Current thread ID = 0x200245f8Faulting instruction address = 0x412daFatal fault in thread 0x200245f8! Aborting.
I first set the modem to power off using ```lte_power_off()```, and then call ```nrf_regulators_system_off(NRF_REGULATORS_NS);```
I'm calling this from a non-secure app. Do I have to add configuration in the bootloader to allow non-secure access to the REGULATORS registers? Are there additional steps to configure before going into System Off mode?
Hi Jack,I am sorry for the delay.
Could you explain what you are using as reference?
I do not recognize this lte_power_off() function, is this a custom function.
It would be helpful if you could share some code, and if anything is sensitive we can make this case private.
Please see how the different thing are enabled in non-secure/secure in the spm.c.
So the call to lte_power_off() is just something I'm doing before trying to go into System Off mode. It's in the LTE Link Control Library found in the NRF Connect SDK. File is found here:
That is unrelated and not the issue. I was just trying to inform you of operations I was doing before actually trying to go into system off mode. The real issue is when I try and write to the REGULATORS register to go into System Off mode. It is documented here:
I'm calling the function nrf_regulators_system_off(NRF_REGULATORS_NS); which is located in the Zephyr project here:
As soon as I write to the REGULATORS register I get a Bus Fault error at that register address. This is what the write operation looks like:
p_reg->SYSTEMOFF = REGULATORS_SYSTEMOFF_SYSTEMOFF_Msk;