No ping response after opening COM port error

[Prathik]

This is the error I have. Couldn't figure out what causes this error. Tried all the related issues mentioned on this website.
I have made sure the python and latest version pip is installed.
Trying serial update on Windows. I use Adafruit Feather nrf52840 board. I have also read that double clicking reset button enters the DFU mode. When I tried it, I could see led continuously glowing and a drive is visible on my PC. I have tried it several times. But suddenly stopped. Double clicking the reset button doesn't make the led glow and i can't see the drive.  

Please let me know what I can do to make this work. Thank You.

[Vidar Berg]

Hello,

Trying serial update on Windows. I use Adafruit Feather nrf52840 board. I have also read that double clicking reset button enters the DFU mode. When I tried it, I could see led continuously glowing and a drive is visible on my PC. I have tried it several times.

Sounds like the problem is that the board isn't entering DFU mode for some reason. Is there any chance the serial bootloader may have been erased from the board? Also, is the bootloader provided by Adafruit, or have you built it yourself from the nRF5 SDK? The "no ping" error indicates that the bootloader didn't receive the ping request.

 

[Prathik]

Thank you for your response.
I'm not sure whether the bootloader was erased or not. Is there any way to test it?
The bootloader was built from nrf5 SDK. The person who built it has tested using nrfutil. It worked for him.
But I'm facing this issue.

Even the double clicking of Reset button doesn't work.

Please let me know if there's any way to fix this issue. Thank you

[Vidar Berg]

Hello,

The Program counter (PC) shows that the CPU is executing code inside your main application and xPSR shows that it's not running in any interrupt context. Unfortunately, it doesn't help explain why your board is not entering/staying in the bootloader DFU mode on startup.

Could you try to view the memory layout if your device with the nRF connect for desktop app just to make sure everything looks to be as expected?

Also, check the if the bootloader address stored at the following 2 addresses matches the actual bootloader address displayed in the nRF connect app:

[Prathik]

The bootloader file is a zip file that I have to use for updating by Serial using nrfutil. It contains bin and dat file. So I cant drag and drop that file.

[Vidar Berg]

Thanks. I see the bootloader start address is stored correctly (@0xFF8/0x10001014). This means your bootloader will get executed after a system reset. So the question now is why it always jumps to the main app instead of entering DFU mode.

I suspect it must have something to do with the bootloader configuration. Do you know if it was built with the NRF_BL_DFU_ENTER_METHOD_PINRESET config setting enabled or not?

[Prathik]

Thank you for your response.
I tried erasing the board and flashing softdevice file and running the bootloader program. Then used the nrfutil command. This also didn't work. I'm trying to do it without main application.
I also got a nrf52840 DK .I tried with board with default 5,6,7,8 pins for RTS, Tx, CTS, RX. It's not working on this board also. Got "No response after opening COM port" in command prompt.

[Vidar Berg]

OK, to verify that this isn't related some other issue with your PC setup, etc, please try to run the batch script from the "Serial DFU test nRF52840DK" folder below. This script programs the stock SDK bootloader through the debug interface before it attempts to upload the Blinky application over UART.

2335.Serial DFU test nRF52840DK.zip

[Prathik]

Should I connect FTDI device or will this work with just the USB cable?

[Vidar Berg]

Just the USB cable when you test on the DK. The on-board Jlink will serve as the USB - UART serial bridge

[Prathik]

I entered the JLink CDC Uart COM port on the bath file.
The 4 Led's are turning on and off one by one.

[Prathik]

I dont get any COM port when I connect my nrf52840 Adafruit Feather board. But I get it on my nrf52840  Development kit.