nRF52833DK make flash error

RE: nRF52833DK make flash error

Michel Lapoutre — Fri, 10 Dec 2021 10:37:19 GMT

Hello,

After hours of debugging and headaches, I managed to find the flaw.

The most complicated task was to find the correct documentation for the dev kit, especially the wiring of the board (will add the link here for other customers nRF52833 Development Kit - Hardware files 1_0_0/PCA10100-nRF52833 Development Board 1_0_0/Schematic_Layout pdf files/PCA10100_Schematic_And_PCB.pdf).

By chance, I found that P25 (DEBUG IN) is a bridge for U1, using a multi-meter to check the continuity of the circuit (I doubted everything at this point), I soldered wires to P25, using an external Jlink on this instead of the USB and used pyocd instead of the Makefile with nrfjprog, I managed to erase and flash a new firmware on it, without any problem.

To sum up: I soldered wires directly on the nearest pins to the nRF chip, and used a Jlink to flash the firmware using pyocd.

Note: I don't have the link of the archive for the PDF, I only have the file itself which I can't upload here.

For P20, P25 and U1 ref: https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/dk/images/nRF52840/pca10056_vext_nrf_switch.svg

I don't know why you mentioned telnet though?

RE: nRF52833DK make flash error

Jared — Mon, 06 Dec 2021 10:50:54 GMT

Hi,

I see. I took another look at your log and see that there is a TELNET session. Are you doing this remotely? If so, could you try re-doing it by connecting the DK directly to the USB port in your computer? Do not use any USB hubs either. The issue could be related to the Segger drivers.

Also, I see that you flash the nRF52820 hex instead of the nRF52833 hex?

regards

Jared

RE: nRF52833DK make flash error

Michel Lapoutre — Fri, 03 Dec 2021 11:46:21 GMT

Hi,

Thanks for your time,

I double checked the RESET pin with another voltmeter: 0.02V with VDD on SW9.

I am using nRF5_SDK_17.1.0_ddde560/examples/peripheral/blinky/pca10100e/blank/armgcc

1. Unfortunately, I get this error: ERROR: JLinkARM DLL reported an error. Try again.
2. OK
3. That is what I tested and I was able to flash 3 times but 150 tries

Regards

RE: nRF52833DK make flash error

Jared — Fri, 03 Dec 2021 10:18:26 GMT

Hi,

Can you double check the voltage on the RESET pin? The pin is active low, which means that 0V on the RESET pin means that the CPU is kept in reset state which is obviously not good.

What example folder of the blinky project are you using? Could you:

do a full erase with nrfjprog: nrfjprog --erase
Disconnect any external signal that might be connected to the Reset pin.
Program the PCA10010 folder of the blinky project from the SDK

regards

Jared

RE: nRF52833DK make flash error

Michel Lapoutre — Fri, 03 Dec 2021 08:46:27 GMT

Yes with SW9 to VDD, the LEDs are blinking but slightly in the dark, by measuring VDD I get between 0,3V and 0,7V. I got 0,0V on RESET, and 5V gives as expected 5V.

Regards

RE: nRF52833DK make flash error

Jared — Thu, 02 Dec 2021 11:56:51 GMT

This is with SW9 set to VDD? The error message indicate that something could be wrong with your supply. What voltage did you measure on the VDD pin? What about on the RESET pin?

RE: nRF52833DK make flash error

Michel Lapoutre — Thu, 02 Dec 2021 11:53:54 GMT

Hi,

The blinking LEDs are very dark but still blinking, when flashing I get "ERROR: There is no debugger connected to the PC."

RE: nRF52833DK make flash error

Jared — Thu, 02 Dec 2021 11:45:28 GMT

Hi,

Could you try setting SW9 to VDD?

regards

Jared

RE: nRF52833DK make flash error

Michel Lapoutre — Thu, 02 Dec 2021 10:10:05 GMT

Hello,

Thanks for your quick answer 🙂

1. Yes
2. No
3. SW6: default, SW10: ON, SW9: USB source
4. This thread does not solve the issue unfortunately

In fact I was able to flash the board with example firmware with success (struggling flashing to the board) by turning ON and OFF the board like 50 times, it seems very random so I want to check if the issue is on my side.

Regards

RE: nRF52833DK make flash error

Jared — Thu, 02 Dec 2021 09:55:10 GMT

Hi,

Some question regarding your devkit:

How is the board supplied, through the J2 USB header?
Have you done any modifications to the board such as cutting or soldering any of the solder bridges?
How is SW6, SW10, SW9 configured?
Could you go through each step listed in this thread, and confirm that none of them solved your issue?

regards

Jared