AnsweredAssumed Answered

Board does not work unless connected to the computer

Question asked by Gustavo Vieira on Jul 17, 2014
Latest reply on Jul 22, 2014 by Adrian Cano

Hi all,


I'm currently working on a project using the Freescale Cup cars. I have a FRDM-KL25Z board and a Freescale Cup Shield to control the motors.

However, my board does work any more if it's not connected to the computer. I used to be able to upload a code, disconnect the cable, power the using the shield and a battery and run it. All of a sudden it changed: as soon as I unplug the usb cable, my program stops running.


Does anyone have the same problem? Is there any way to fix it?


I found out that it works as long the USB cable is connected, either on the USB or the OpenSDA port. It seems the cable simply powers the board. But I used to do that with the shield, and don`t know why it no longer works.