MCU firmware

[Robertas]

• Hello I just got nrf52dk board, and have issues with dfu mode of MCU, after power on board is dead no any lights, no USB connection. After pushing reset and power on, MCU led blinking and have USB connection but just with access to firmware update .reset or power off dost bring board to normal mode,  any chance to point me right direction, can I have firmware to try upgrade MCU. Thanks 

[Sigurd]

Hi,

Please go through the steps in this post. Step 4 in the post shows you how to reprogram the JLINK firmware.

[Robertas]

Can I use same file to flash virgin MCU? 

Another issue is I have this board at device manager but j-link can't find any USB or com port, tryed different drivers including original, have checked with j-link config, arduino ide can see com port but crying about missing board 

Thanks for your help 

[Sigurd]

You will need to place the Segger J-Link MCU in bootloader mode in order to flash it.

It should then show up as a removable storage device:

Double click on BOOTLOADER, and drag and drop the firmware (found in step 4, called J-Link OB-SAM3U128-V2-NordicSemi 170724.bin) into the BOOTLOADER folder.

Wait a couple of seconds, and turn off/on the DK again, and the JLINK drive should appear:

I would recommend downloading SDK 15 from here, and use SES IDE.

Please take a look at the getting started guide found here.

[Robertas]

Thanks, It's help me very much, 

I have one more question: 

I want use nrf52832 as MCU to collect data from Ic2 temperature sensors record to sd card and real time monitoring on tablet as well read sd card logging data by Bluetooth on tablet, can you point me if it's good idea to use this module as I tryed some examples and it's look I didn't find one of suitable with Bluetooth  pin pairing, or if it's pairs without pin after unpairing device undiscovered til I reflash code to module, do you have any examples in mind which is good for this project or any advice, sorry for dump questions as I am new to this. Ex arduino user. Thanks 

[Sigurd]

The nRF52832 is perfect for this.

First you will need to find or write some drivers to interface with the i2c sensor. If it’s a popular sensor, you might find some drivers online somewhere.

We have some I2C/TWI examples in the SDK, see this and this link.

We also have a SD card example. See this link.

The Glucose Application example in the SDK shows you how to implement passkey.

[Robertas]

As i am using Keil uVision5 its comes with old softdevices and examples, i tried import examples from nrf5 sdk 15 with no luck, if is any modern way to use this examples without missing files and errors? i didnt find any options to import last versions of softdevice. Thanks