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How to use USB host just for powering the FRDM-K64F device?

Question asked by Mahendran Manoharan on Aug 1, 2018
Latest reply on Aug 9, 2018 by Mahendran Manoharan

I am using FRDM-K64F board to record data to SD Card. And I added the USB MSD functionality in the device to access the SDCard through USB. My end device will have provisions to operate with Battery power and/or USB power.

 

Two questions are

1. When my device is recording the data to SD Card, If I connect to USB Host, I don't want the USB MSD functionality to be active (I can do this by not enabling the USB functionality in the code). However, I don't want USB Host to suspend the USB device, but I'd like to have the Host keeps supplying power without USB device functionality enabled. How can I do that?

2. When my data recording stopped (with USB connected to Host), I can enable K66F USB device MSD functionality. But I'd like to know, how to let the Host knows that USB device is connected without physically unplug and replugging in USB.

 

Thanks,

Mahendran.

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