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.