FRDM-K64F and Keil Studio

[nømad]

Hi

I just got my board today, I followed the steps to flash the firmware in https://os.mbed.com/platforms/FRDM-K64F/#get-started-with-mbed and https://daplink.io/?board=FRDM-K64F 

After following the steps here https://os.mbed.com/blog/entry/DAPLink-bootloader-update/ to change the bootloader to maintenance keil studio keeps on giving me "The connected device is unsupported" and "A problem was detected communicating with the detected device 'DAPLink CMSIS-DAP', it may be in use or need reconnecting"

My mock code runs when I build a bin but I can not debug or run the code from keil the options are grayed out.

Is my board bricked or is there a fix? FYI I'm pretty new to hardware programming

[Robin_Shen]

Hi nømad,

Did you follow the "Step 5: Install an interface firmware application" and install the 0244_K20DX_FRDMK64F_0X5000.BIN?

Then you should be able to see CMSIS-DAP debugger in Keil MDK.

Best Regards,
Robin
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[nømad]

Hi Robin,

Yes, I have followed step 5 but I installed version 254.

I am using Keil Studio Cloud I believe I didn't specify that.

I downloaded the MDK but couldn't figure out how to get the debugger to open.

[Robin_Shen]

Please try to install 0244 instead of 0254.

[nømad]

Tried 244 still having the same issue.

The defaults in MDK were different as well.

But I have the option to change them and save them which didn't make any difference as far as I could tell

[Robin_Shen]

Very strange, this is the first time I saw this error, may I ask if there are others occupying CMSIS-DAP?
Please try restarting the computer, only open Keil MDK, and try to select CMSIS-DAP as Debugger.

Have you tried to install J-Link firmware application, and then try to use J-Link to debug in Keil MDK?

If it still doesn't work, I am afraid to contact ARM's technical support about CMSIS-DAP and Keil MDK.

[nømad]

My device now loads in Keil MDK but when I try to use Keil Studio Cloud it still doesn't work and I get the same error.

The only thing I can think of is that Keil Studio Cloud does not support the update that changed the board from bootloader to maintenance. My friend got the same board and hers works perfectly. Is there a way to revert the board's original state and get back the old bootloader version?

[Robin_Shen]

I am afraid you need to contact ARM's technical support about CMSIS-DAP and Keil Studio Cloud. Did you click Request Support?

[nømad · Accepted solution]

I did, but just found the solution.

Solution: Just downgrade and update the firmware with a Unix device because windows is windows

It works perfectly on both platforms now.

~Thanks for the help anyways @Robin_Shen!