PIC18f452 USB Question

dossdev · Joined: 08 Jul 2009 Posts: 24

I need to interface to a custom app running on a PC via USB. Normally I do this using the FTDI 232 chip which creates a virtual COM port on the PC. I'm planning on using an 18F part in my design anyway so I thought I might try and spare the expense of the FTDI chip and use the USB capability of the 18F452. I realize the PIC USB devices offer full USB support, however I only need to send/receive simple serial data to/from the PC. The FTDI parts are dead simple to use. My concern is whether or not I can get the PIC's USB to register with the PC as a virtual com port without a lot of grief. This is a make versus buy question. I can save a few bucks if I can rill the USB into the PIC.

Thanks to all in advance
-Dan

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

dossdev · Joined: 08 Jul 2009 Posts: 24

Sorry, wrong p/n. I would use something like an 18F2455, 2550, etc.

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

The existing USB_serial (CDC) examples are basically doing what you want. CCS provides also an *.inf file to install the device as virtual COM port. The FTDI VCOM and FTD2XX drivers have however still a few handling advantages. So I suggest to test the CCS CDC driver with your application enviroment.