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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| USB - PIC Organic or FTDI? |
 Posted: Fri May 28, 2010 5:29 pm |
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I need a USB vitual serial port and have had good results with the FTDI parts. I was wondering how difficult it is to use a PIC USB part and implement the same without the FTDI part?
Any words of wisdom?
Thanks,
John |
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Rohit de Sa
Joined: 09 Nov 2007
Posts: 282
Location: India
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| Posted: Fri May 28, 2010 11:45 pm |
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| Quote: | | how difficult it is to use a PIC USB part |
Pretty easy if you've got a PIC18F2550 or 18F4550.
Do you want to use the PIC as a USB-to-serial converter? That would mean editing ex_usb_serial.c in the examples folder. Basically, the examples provided by CCS allow you to implement the USB-to-serial converter on the microcontroller itself.
You could still make a simple USB-to-UART device by modifying the example mentioned. But if you require a standalone virtual serial port with all the handshaking lines, I would recommend going with the FTDI chip - writing code for such a device may be too much of a hassle.
Rohit |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Sat May 29, 2010 12:15 am |
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The benefit of PIC implementation of virtual com port is for applications, that need functionality beyond a simple serial interface.
If I understand right, this also the case in your application. In my opinion it's pretty easy, I don't see a need for an additional
FTDI chip for similar designs. |
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Eddy71ua
Joined: 23 Sep 2009
Posts: 55
Location: Ukraine
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| Posted: Tue Jun 01, 2010 11:58 am |
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| What to do if you want to use the DTR, RTS, Ri ?.. |
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Tue Jun 01, 2010 3:12 pm |
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No. Just need Tx and Rx.
I was just reading about the serial stuff for USB in the latest compiler manual.
Looks like this may be the ticket.
Thanks,
John |
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