My application will use intensively use Virtual Com Port to exchange datas from my board to the PC. I would like to make sure that debugging through STLink is still possible as i will be exchanging datas. Does St Link use the same USB port for debug and application ?
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You can use the VCP and debug at the same time. They're on the same physical USB port, but it's a composite device. The ST-Link and serial port act as separate devices.