NRF52840 experimental_bootloader_secure_usb Example

[jwcheon]

Hi,

I am testing the experimental_bootloader_secure_usb example.

I have confirmed that the old v0.9.2 board has been replaced with a new board and connected to the [COM serial port].

But there was another problem.

This is how I proceeded.

1. Program soft device through nRFGO Studio (5.0.0-2 Ver)

2. Build and download the experimental_bootloader_secure_usb example via Keil (this is the example in the pca10056_debug folder, not the pca10056 folder example).

3. After downloading, press the reset button on the board + DFU mode entry button (I have modified the code with Button1) (make sure to connect to [COM serial port]).

4. In nRFgo Studio, set the Hex file (ble_app_hids_mouse_pca10056_s140.hex) in the nRF5x Bootloader tab as Application and its COM port and program it.

Here are the errors that occur after this.

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Timed out waiting for acknowledgment from device.

Failed to upgrade target. Error is: Attempting to use a port that is not open

Possible causes:

• bootloader, SoftDevice or application on target does not match the requirements in the DFU package.

• The baud rate or flow control is not the same as the target bootloader.

• target is not in DFU mode. If using the SDK examples, press Button 4 and RESET and release both to enter DFU mode.

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Do I misunderstand the test method? Is there anything I'm missing?

[Bjørn Kvaale]

Have you taken a look at these two links: link 1, link 2?

[jwcheon]

Hi, Kvaale.

I am checking based on the link that I give.

However, there is an additional question in the [experimental_bootloader_secure_usb] example

Can you tell me the difference between "pca10056" and "pca10056_debug"?

When I build it, "pca10056" seems to want to generate a public key.

[Bjørn Kvaale]

With the debug version, you will most likely get more debugging information if you decide to debug the example via rtt for example. Also, the debug version will not be as optimized as the release version (e.g. bootloader size). Also, I believe the debug version does not require version checking, whereas the regular release version does. Take a look at this link too.