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  • Author Author: YT2095
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Now what???

YT2095

I find myself in a somewhat unfamiliar situation at the moment, having been encouraged to explore USB using PIC chips (in particular the 18F14K50), I was told it would be a good idea to build a Dev board clone similar to this: http://www.tautic.com/new-video-pic18f14k50-usb-dev-kit-assembly and also this: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en536385

so I did, or at least My version of them, here: image

and a different angle to show the USB breakout:

image

 

All seems to be working, although I do have some concerns about the PICKit and USB port sharing the same data pins on the chip, and Why when MPLAB powers the board to find the chip (which it does perfectly!) it runs the thing at 3.3v instead of 5v?

 

but I digress.

the "Problem" is that now it`s built I haven`t the remotest idea of What to do next?

I`m purely a Hardware person, and never build anything without knowing what exactly it`s suposed to do and how it will do it, this whole PIC thing is Very new to me, in fact Arduino is still quite new (only been doing that about a year now) so I`m kinda Stuck, at least on the USB aspect of things.

Yes I could probably make the port pins do whatever I wanted inteligently, but the other peripherals on the chip I have no idea about?

 

So if there Is some kind soul out there reading this, and with the patience to walk a complete novice through these early stages, I`d be very grateful!

  • I am looking at the development board circuit and your schematic...but you seem to be in need of inspiration...so a few suggestions...

     

    You could possibly have programmed a bootloader into the pic and then created a pure USB application with any further programming changes via USB. No need for the ICSP circuit then and will save components.

     

    Or you can still program the bootloader and ignore the ICSP from then on...I suppose whilst developing it would be usefull to keep the ICSP.

     

    I would have used a diode on the MCLR to block any voltages from the VPP voltages upsetting the 5V power...so chip can get power through pull up res, but voltage from ICSP will be blocked...will dig out a few pics!

     

    There are lots of applications provided by Micrcochip for USB applications in the MAL library...I havent used the new K chips yet but can see that a few applications are supported...you would see your dev board as a low pin count board...microchip provides hardware definition .h files for this....

     

    more soon!