USB and SWD errors?

[Jerry]

Using rev 0218 firmware I am getting an awful lot of device errors with the mbed kit. I am not sure if this is a Nordic or an mbed issue so am asking in both places. Symptoms I observe include

1. Failure to be recognised as an mbed FAT volume on Windows 7x64: Specifically Windows warns that formatting is required before the disk can be used

2. Flashing a new image created using the online compiler fails. A 'fail.txt' file is written to the disk with 'SWD ERROR' as its only content. This on both Windows 7 and Windows 10 hosts.

Has anyone seen similar problems? Both hosts have been used with dozens of mbed devices without problems.

TAIA

Jerry

[Susheel Nuguru]

Hi Jerry, I never heard about these errors, would be nice to know if you had some progress with this?

[mitul desai]

I am having same problem while copying hex file to MBED drive. I am using BMD-200 evaluation kit. Its also connecting & disconnecting automatically

[Mich]

I'm having this problem, which is forcing me to avoid teaching the nrf51822 part of our workshop.

My teaching platform:

• Sony Vaio Duo 13 (2x USB3)
• Windows Desktop 10
• Anniversary update
• AMD64 English
• nRF51-DK
• ARM mbed
• CMSIS-DAP v0218

The desktop computer in question (a mobile notebook) is used with other hardware (FRDM boards) without any problem. It just fails with nRF51-DK ones, and I wonder if the nRF52-DK is any different?

Failure

1. I plug the nRF51-DK in to the computer
2. I turn on the nRF51-DK
3. It appears in the file explorer as a USB mass storage device
4. A second later it disappears
5. A few seconds later it reappears
6. The USB mass storage device randomly appears and disappears

In some cases, I have enough time between reappearance of the USB mass storage device in order to drag and drop a hex file which fails.

Students

Students of my workshop have experienced this problem on a limited basis. Most (maybe 85%) of the windows using students I teach are able to program the nRF51-DK successfully.