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PIC USB device supported by CCS

 
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benoitstjean



Joined: 30 Oct 2007
Posts: 384
Location: Ottawa, Ontario, Canada

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PIC USB device supported by CCS
PostPosted: Fri Sep 11, 2020 8:04 am     Reply with quote

CCS version: 5.026

Hi guys,

Its been a little while.

Won't go into many details but I need a PIC MCU - that is supported by my CCS version - that has a USB host controller on it so that I can program the MCU to act like if it was a PC so that I can tie a USB key to it (and do data transfer).

Worst case scenario, I will use a PIC24 and an external USB host chip. I'm going through the Microchip website but I have to familiarize myself with the USB terminology as I've never attempted what I am attempting to accomplish. I think this is what I need though - a PIC with USB host.

I've used the FTDI232RQ tie to a PIC's UART but this FTDI is seen by my PC as a virtual COM port... now, I want to do the opposite: I want the PIC USB to 'act' like it was the PC...

Any suggestions?

Thanks!

Ben
Ottawa, Canada
Ttelmah



Joined: 11 Mar 2010
Posts: 16320

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PostPosted: Fri Sep 11, 2020 8:30 am     Reply with quote

USB hosts on devices like the PIC, can't be 'generic'. You can do a host to
control a storage device, or one to support a keyboard/mouse etc.. Or
one to control a CDC device etc. etc..
Each needs a separate stack implementation.
CCS has not translated the MicroChip implementation of this, but these
can be compiled and used. However be prepared for them to be quite
nastily 'fussy' about the devices they will accept. The amount of error
checking and recovery in the PC stack, and just how many devices it
supports, is not something you are going to get from a PIC.
benoitstjean



Joined: 30 Oct 2007
Posts: 384
Location: Ottawa, Ontario, Canada

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PostPosted: Fri Sep 11, 2020 8:34 am     Reply with quote

hmmm... so then if I was to use a standalone USB IC that will be controlled by a PIC24EP, any suggestion?

Thanks again,

Ben
newguy



Joined: 24 Jun 2004
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PostPosted: Fri Sep 11, 2020 10:15 am     Reply with quote

FTDI Vinculum. Single chip USB host which can be accessed via serial by a relatively low power PIC.
dluu13



Joined: 28 Sep 2018
Posts: 354
Location: Toronto, ON

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PostPosted: Fri Sep 11, 2020 11:03 am     Reply with quote

newguy wrote:
FTDI Vinculum. Single chip USB host which can be accessed via serial by a relatively low power PIC.


temtronic also liked these. I personally got one and got partway through writing something to read/write from the USB key but decided to go with an SD card instead.

Make sure you install the firmware version that is for USB keys and it provides a command-line-like interface that you can access via uart.
benoitstjean



Joined: 30 Oct 2007
Posts: 384
Location: Ottawa, Ontario, Canada

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PostPosted: Mon Sep 14, 2020 12:20 pm     Reply with quote

Hi guys,

Thanks all for your suggestions. I did a bit of searching after posting and also figured-out that the VNC2 from FTDI would probably suit me well.

Thanks and have a greatd day!

Ben
temtronic



Joined: 01 Jul 2010
Posts: 7625
Location: Greensville,Ontario

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PostPosted: Mon Sep 14, 2020 12:24 pm     Reply with quote

VNC2... pretty sure I have 2 of them and the 'programmer interface' module here, collecting dust. i KNOW I bought them from Digikey, sigh, years ago....
'magically', 'somehow' I got it to get a PIC to go between a PC and a USB flashdrive...
yeesh, that's seems like 'decades' ago.....

Jay
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