Mbed OS not work on nRF52840-DK

[UriC]

I received  nRF52840-DK from Mouser :

Sales Order No: Web Order No: Order Date:

242789421 14270760 29-May-18

I started to use it and some problems exist:

 

1. I placed power selector to "USB" and connected USB cable but board is not powered.

It's work only when I select "external power source" and  connected USB cable. I don't know what need select when I connect  "external power source" or "lithium battery"

 

2. I got it for use with Mbed OS.  I used online compiler with simplest "mbed-os-example-blinky"

After success compilation I placed bin file to JLINK drive but after reboot led is not blinked :(

I opened settings of board : https://os.mbed.com/platforms/Nordic-nRF52-DK/

and see that it's not same board I received.

Please help to make it work.

[Edvin]

Hello,

I was not able to follow your link. It opens my compiler environment, but not with the project that you are linking to.

Sorry. I am not very familiar with mbed. But I found an example called mbed-os-example-blinky. I suspect it is the same as you use. I found it here.

I compiled it, and downloaded the .hex file. I tried to drag'n'drop it, but with no luck. All the LEDs remained on. 

Then I used nrfjprog or nRFgo Studio, and erased the board, and programmed the .hex file via that. Then I reset the board, and it worked. Can you try to use either nRFgo Studio or nrfjprog (command line tools) with the project that I linked to? (which hopefully is the same project that you linked to.)

 

Best regards,

Edvin

[UriC]

1.I used introduction link :https://os.mbed.com/docs/v5.9/tutorials/quick-start-online.html

2.  I don't have this Studio and not CL tools.I want to use high-level programming language with less code as possible. for this kind users was created Mbed and I wan't to use it. So please make it work/

[Edvin]

I am just trying to figure out whether your issue is in the project/compiler or if it is in the upload procedure.

Can you try to power cycle the DK after uploading the .hex file using drag'n'drop?

nRFgo Studio is a quite easy-to-use, and self explaining application. 

 

Best regards,

Edvin

[UriC]

I told it many times that I know it and it work. Examples I tried with SEGGER Embedded Studio worked.

Problem in code that generated by online compiler. Nordic + ARMbed need to solve this problem. 

[Edvin]

I guess that the nRF52840 platform is not working yet. If you compile the project that you linked with this main.cpp:

#include "mbed.h"

DigitalOut led1(P0_13); //LED1 = 13 on nRF52840 DK

// main() runs in its own thread in the OS
int main() {
    while (true) {
        led1 = !led1;
        wait(0.5);
    }
}

And use the nRF52DK as platform, it works.

After uploading the binary, you have to power cycle the board(!) not just the reset button.

 

I know that this is not ideal. But I have no better solution, until a stable version of the nRF52840 platform is released on mbed.

 

Best regards,

Edvin