back to uC, PIC16F87X

[Mikko Helin]

Hello,

I've written a draft on using the PIC16F877 for MIDI-CV etc.
If there are more people who liked to have something like
this done we could build & program a prototype and
then have the pcb's made somewhere. So how's that?

The URL for the draft is 

http://www.uta.fi/~helin/midipic.pdf

-Mikko


> Hi Roel,
> 
> The F87x will be fine for this, though personally I'd use an AVR
> microcontroller. However if you already know pic assembly language that
> would be the best way to go. If not I think the STK200
> programmer/development board for the AVR is about 35 pounds(including a 40
> pin 8515 micro with UART, 3 timers and 8k flash ROM).And the silicon is
> cheaper than PICs if you know where to get them. 
> 
> A good use for the A/D would be for a menu system:
> 
> Have an LCD or 7seg LED display for readout.
> Say for example you want to edit the midi channel....
> 1. Read the pot value (potval). 
> 2. swap potval so the upper 4 bits are now the lower 4 bits.
> 3. And potval with 00001111 to mask out the top nibble.
> 4. You now have midi channel 0-15. You can store this as the midi channel.
> If you want to display the midi channel just copy and increment this
> channel so that channel zero displays channel one.
> 
> You can do this for all kind of parameters, changing it depending on how
> many values you need. eg. if you wanted 255 values you can use the direct
> value that you read from the A/D.  
> 
> Hope this Helps (and not confuses!)
> stewart pye
> 
> 
> At 11:22 AM 15/10/99 -0700, Roel Das wrote:
> >Just a little more on the microcontrollers...
> >I'm designing a midi-cv as part of my endworkproject. 
> >Any recommandations on the processor? It should be
> >VERY complete, nice interface and things...
> >I can get a programmer and emulator-board for the
> >microchip PIC16F87X series (20MHz, up to 5 I/O's,
> >USART,up to 8 10bits ADC's,... and more) at school for
> >about 90 Euro. The chips themselve cost 10 to 25 euro,
> >i believe. 
> >Would this be an ok deal? 
> >Is the usart usable for MIDI?
> >Any way to make use of the ADC? Controlknobs maybe?
> >Thank you very much.
> >smile
> >Roel
> >__________________________________________________
> >Do You Yahoo!?
> >Bid and sell for free at http://auctions.yahoo.com
> >
> >
> 
>