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USB PICs

 
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Alvin
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USB PICs
PostPosted: Tue Feb 13, 2007 11:57 am     Reply with quote
I've been using an FTDI chip to communicate with a PIC18F2480 via USB. I was wondering if anyone has experience with the PICs with built in USB. Are there windows drivers for them? How would you go about communicating through usb with a windows program?
ak6dn



Joined: 08 Jan 2006
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Re: USB PICs
PostPosted: Tue Feb 13, 2007 1:49 pm     Reply with quote
Alvin wrote:
I've been using an FTDI chip to communicate with a PIC18F2480 via USB. I was wondering if anyone has experience with the PICs with built in USB. Are there windows drivers for them? How would you go about communicating through usb with a windows program?


I just started to play around with the PIC18F2550 with integrated USB controller in full speed mode (12Mb/s) using the CCS 'CDC' serial port emulator stack. So far it's been working pretty well; the device enumerates properly under WinXP and appears as a COMx serial port, and I've been able to sustain just north of 60KB/s (~600Kbaud) communications from the PC looped thru the PIC.

Look at the EX_USB_SERIALx.c examples in the CCS Examples folder as a starting point, and read the header comments in the driver files (all pulled in thru the usb_cdc.h include reference).

There is no custom driver required on the PC side, only an .inf file that references the standard windows USB serial comport emulator driver. CCS supplies a template .inf file for these examples in their Drivers directory (cdcNTXP.inf IIRC).

If you want to have an interface that is more complicated than a serial port emulation I believe that the CCS USB stack supports that as well; they have several other USB examples. However I believe these will require you to provide a custom driver on the windows side.
Douglas Kennedy



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PostPosted: Wed Feb 14, 2007 7:38 am     Reply with quote
Look in the CCS code library. Microchip has a dll you can call from visual basic delphi visual c etc.
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