nRF52833: CDC ACM USB Bootloader example is not available.

[Akib]

Using windows 10 OS, and SES v5.40.

I am using nRF52833 device in my project along with nRF5_SDK_for_Thread_and Zigbee_v4.1.0_32ce5f8 SDK.

As we can see that there is an example of CDC ACM USB Bootloader available for nRF52840 only https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/sdk_app_serial_dfu_bootloader.html but we need for nRF52833.

so is there any example of CDC ACM USB Bootloader available for nRF52833 or supports nRF52833?

[Akib]

Hi,

Thanks for the reply and Happy new year.

we are not using any soft device but in loader section MBR hex is added.

So at time of flashing we ware added MBR hex file too then its looks good even serial port is detecting too but while updating device through bootloader it's throwing error.

even in nRf connect we can see that the memory layout is same.

 

device flashed through nRf connect.

device flashed through SES.

And one strange thing i have observed too if i flash through SES and read device through nRf connect then it's throwing the same error.

[Einar Thorsrud]

Hi,

Akib said:

we are not using any soft device but in loader section MBR hex is added.

I see. As long as you flash the MBR hex together with the application from the programmer app, then this should be equivalent and the flash content should be exactly the same and it should work the same.

Akib said:

So at time of flashing we ware added MBR hex file too then its looks good even serial port is detecting too but while updating device through bootloader it's throwing error.

This error states that the serial port cannot be opened. This could for instance be because of an issue on your PC, or that the firmware running on the nRF did not enable the USB properly (like an issue with the USB bootloader not started).

Akib said:

And one strange thing i have observed too if i flash through SES and read device through nRf connect then it's throwing the same error.

This is peculiar, as a simple read does not change the flash content at al.  Could it be that nRF Connect Programmer was holding the USB serial port? What happens if you close it (or even reboot the computer) and try again? What if you reset the nRF instead, or do both?