troubleshooting of produced prototype: nrf9160

[David]

Hello,

I have developed 10pcs of one prototype with the nrf9160 SiP. 

I have some questions regarding some errors im having.

Regarding the SIM 1V8 driver VCC, for UICC interface, I am observing a fluctuation on this channel/voltage, from 0V -> 0.4 VDC, with approximately 1hz frequency.

What can cause this to happend, what is the normal behaviour of this channel when it is short-circuited with ground or something else/similar ?

My second question is regarding the attached image, im observing this on a few of my prototypes, im not able to upload any modem firmware to the SiP, any idea why?

Regards,

David

[David]

Hey Didrik,

Thank you for the reply. I will have a closer look at what you commented, about the hardware.

First I have to solve the application FW/SW for the prototype, maybe you have help me answer me on some troubles I have been having?

So, Im using the PCA10090 for reference.

I've set-up the Segger embedded environment correctly, and installed west with the latest repositories, v1.1.0.

I have managed to create a FW which I can upload over SWD to reference board, this works. This works both with .elf and merged.hex (non-secure) and (secure).

If I try to upload this to my prototype, it will not work with merged.hex, it only works when I build without "ns", as .elf.

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I've read up on the SPM, and for everything to work, I have to first upload the SPM firmware without "ns", then I have to upload my application firmware, as "ns".

Also, I have to set in proj.conf, CONFIG_SPM=n for this to be available as .elf, for me to build. If not, this wont work.

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Ideally, I would like to use the refernece board for prototyping, so that this can be 100% compatible with my prototype, as-far as code compatibility, as multiple image file (merged.hex). 

How can I achieve this?

Im not very experience with Zephyr yet, and trying to learn.

I'd appreciate a fast response.

In advance, thank you.

below is project files.

Regards, David

CONFIG_BSD_LIBRARY=y
CONFIG_GPIO=y
CONFIG_SERIAL=n
CONFIG_STDOUT_CONSOLE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_NETWORKING=y
CONFIG_NET_BUF_USER_DATA_SIZE=1
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_NET_RAW_MODE=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_LOG=n
CONFIG_LOG_DEFAULT_LEVEL=4
CONFIG_HEAP_MEM_POOL_SIZE=1024
# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_ADC=y
CONFIG_ADC_0=y
CONFIG_ADC_NRFX_SAADC=y
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SPM=n