J-link not find device(Info: Could not measure total IR len. TDO is constant high.)

[steven]

Dear all: Now,i have issue ,i can't fund device.(i have sure the hardware is OK) i think it is program overwrite the J-TAG register(TDO)? but i may not sure. have any experience about this error?

i try run J-Link commander to clear ,but

J-Link> r Info: Could not measure total IR len. TDO is constant high. Reset delay: 0 ms Reset type UNKNOWN: ??? Info: Could not measure total IR len. TDO is constant high. J-Link>r

****** Error: TCK (pin 9) low, but should be high. Please check target hardware. Reset delay: 0 ms Reset type UNKNOWN: ???

and i exe nrfjprog --recover to

it get C:\Users\steven>nrfjprog --recover Applying pin reset if debugger is not active. System off disabled until pin reset or power on reset is done. Halting device. ERROR: Cannot connect to the nRF51 device.

the nRFgo studio is also not found any device .(In the boot of the moment, nRFgo maybe detect the device) read back protected or not found device.

[Jim]

I'm running into this, too. I have narrowed it down a bit. If I compile an example application (ble_app_proximity for the pca10001) unchanged, it works.

If I duplicate that directory, and change the project name, I'm dead.

Not sure how I'm supposed to create a new project (lots of settings to match).

Sometimes I can still see the devices with nRF Studio (no need to recover) but this still happens so I don't think it's related to the need to recover.

[Paul]

I got the same problem today. Luckly it didn't take me too long to find out this "copy/paste" issue. Working on it right now to see if any luck to "fix" the copied folder. Otherwise I will create a new project. :-D