MCUBoot Application not starting Program on Custom nrf5340 PCB

RE: MCUBoot Application not starting Program on Custom nrf5340 PCB

Elfving — Wed, 20 Jul 2022 13:33:06 GMT

No problem.

[quote user="mattmacleod"]I was told that shorting SB47 would allow me to use a DK board as a programmer/debugger according to these instructions for modifying for debug out. [/quote]

Where are you seeing this exactly? You can use the DK as an external programmer by simply using the debug out connector (J19), but you would have to program the external board yourself. If you want the DK to power it however you can solder SB47. Like it says there on infocenter:

" While SB47 is shorted, it is not possible to program the onboard nRF5340 SoC even if the external board is unplugged."

So I am a bit confused as to how you are successfully flashing a Blinky sample to it. Are you using the nRF USB or the main USB to power the DK? When attempting to flash the SoC on the DK, have you disconnected the 10-pin debug cable?

Regards,

Elfving

RE: MCUBoot Application not starting Program on Custom nrf5340 PCB

mattmacleod — Tue, 19 Jul 2022 18:20:42 GMT

I have followed the instructions you provided and still no clock signal.

I tried using the modified nrf to perform a DFU over serial using mcumgr and here is the following output:

c:\ncs\v1.8.0\nrfApps\serial_dfu_hello_world\build\zephyr>mcumgr --conntype serial --connstring "COM4,baud=115200" image upload -e app_update.bin
39.71 KiB / 39.71 KiB [=======================================================================] 100.00% 2.30 KiB/s 17s
Done

c:\ncs\v1.8.0\nrfApps\serial_dfu_hello_world\build\zephyr>mcumgr --conntype serial --connstring "/dev/ttyACM0,baud=115200" image list
Error: The system cannot find the path specified.

c:\ncs\v1.8.0\nrfApps\serial_dfu_hello_world\build\zephyr>mcumgr --conntype serial --connstring "COM4,baud=115200" image list
Images:
image=0 slot=0
version: 0.0.0
bootable: true
flags: active confirmed
hash: c32d83a704ccc2ccd03ed91269f4fb0d25697c901f48d5e91c2d262b56bdb715
image=0 slot=1
version: 0.0.0
bootable: true
flags:
hash: 2081b9546a86a83f164c58f48979bf929a975bb233abcbc852d11f5289a4ef65
Split status: N/A (0)

So it appears to be flashing the device.

Any other ideas?

Thanks,

Matt

RE: MCUBoot Application not starting Program on Custom nrf5340 PCB

mattmacleod — Tue, 19 Jul 2022 16:02:20 GMT

Thanks for the updated tutorial. I'll give that a try.

Yes, when I flash it to a DK board the blinky example works. Im assuming this is because the DK board already has a bootloader.

I was told that shorting SB47 would allow me to use a DK board as a programmer/debugger according to these instructions for modifying for debug out.

And the only debugger I've used is the modified for debug output nrf5340-DK board.

Thanks for your help,

Matt

RE: MCUBoot Application not starting Program on Custom nrf5340 PCB

Elfving — Tue, 19 Jul 2022 13:16:38 GMT

Hello again,

First, I should mention that this is a slightly older tutorial, and it is based on NCS 1.4. I see that you are using NCS 1.8 which might be an issue. I'm not sure if this is a problem yet, but just know that there are newer tutorials available.

I am not sure if you are able to debug/program the SoC on the DK with the onboard debugger if you have shorted SB47. Are you able to flash a simple Blinky sample to your DK? Are you using an additional external debugger?

Regards,

Elfving

RE: MCUBoot Application not starting Program on Custom nrf5340 PCB

Elfving — Mon, 18 Jul 2022 12:15:42 GMT

Hello Matt,

I will have to get back to you on this. We have entered the summer holiday period in Norway so staffing is low, some delays should be expected.

Regards,

Elfving