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Author Topic: Using the second port as ... usb?  (Read 1885 times)
jml
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« on: July 17, 2009, 06:36:12 PM »

Before I go cranking away, has anyone got sample code to use the second USB port (the serial debug port) as a regular-old-USB-port-#2? Can it even be done? I'd think so... would like to use it to drive a second HD or possibly a display.

Thanks!

jml
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brentpotter
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« Reply #1 on: July 29, 2009, 02:21:52 PM »

That second USB port is nothing more than a serial port and JTAG interface to the ARM.  An FTDI serial-to-usb chip on the daughterboard does the translation, so the ARM never sees that USB port.  This type of serial-to-usb converter is becoming very common because serial ports are now very rare on new computers, while USB is now standard.
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kens
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« Reply #2 on: July 30, 2009, 10:23:07 AM »

The problem is the second port is a USB device, and you want a port that's a USB host.  To simplify slightly, the port goes the "wrong way" and needs to be connected to another computer, not to a USB device like a keyboard or flash drive.  If you need more USB ports, just connect a hub to the main (host) port.
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