On 2/10/2014 5:17 AM, David Duffy (AVD) wrote:
> On 10/02/2014 9:53 PM, Mike Harrison wrote:
>>> Sorry, that DMX was a typo.  It should have read  DMA.
>>>
>>> When I load the data one byte at a time into the SPI hardware, there is
>>> always a small gap between bytes.
>>>
>>> What I'm trying to do is generate a data stream for the 2811 variety of
>>> RGB pixels.  This is while receiving a DMX stream using interrupts.
>>> David...
>> I'm not familar with that PIC - some SPI ports always leave a gap, thoug=
h this can sometimes depend
>> whether you're using the "buffer not full" or "transfer complete" to rel=
oad.
>>
>> the SPI on the 32MX  can definitely stream continuously,has a fifo and a=
lso a 32 bit mode which can
>> make this stuff more efficient - no real need for DMA, though it is avai=
lable if necessary.
> If have to change chips and redo the PCB, I might as well use an AVR
> instead.  There are code libraries out there that seem to manage the
> 2811 pixel data stream on a fairly low end AVR.
>
> I suspect the non-optimised XC8 compiler is not helping me either. Yet
> another design moved away from PIC for me.
> David...
>
I simply can't IMAGINE dropping PIC for anything. In my long lifetime=20
I've programmed  Intel, RCA, Atmel, ST, Motorola, plus a few others, and=20
without question PIC beats 'em all, in so many ways I have no time for=20
the list.

Just my 2 cents, which, due to inflation is evaporating rapidly...

--=20

The only place success comes before work is in the dictionary.

VINCE LOMBARDI

--=20
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