altineller 4 Posted March 14, 2017 Share Posted March 14, 2017 Hello, Is there any way to figure out if a Tiva-C board is being powered with the usb connector, or from an external power supply connected to vbus? This is the problem I am facing: I am poweing Tiva-C board from the vbus connector, on a robot. At times we need to connect the usb cable for programming. Since VBUS is connected to external battery, it will "some times" (most of the time) - crash the computer. So I am using a pololu switching regulator, with a shutdown control pin. What I would like to do is, the device to figure out if usb power is being used, and shutdown the external power supply. I did search the web and found out that PD_7 is the vbus detect pin, and just digitalRead on that pin would lead to result, but I tested it, and found out it does not work. Any ideas/help/recommendation is greatly appreciated. Quote Link to post Share on other sites
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