Hi all,

I have made a CNC in last year, using a 16F877A to control all of it.
It purpose is draw images with a pen, those images are selected on the
PC and the pc software convert the image to a binary matrix and send
it to the PIC. By PIC memory limitation I just can send 400 pixels (or
400 bits) of my image, after receive those 400 pixels the CNC draw
them and alert the PC to send the next 400 pixels, and keep doing this
until complete the draw.

I'm having problem in the communication between the PC and the PIC,
this problems looks aleatory, because in the middle of the image send
process the communications breaks. To resolve this I wanna use a
memory buffer and send all the image and save pixel by pixel (or some
package by package) to this memory, and after send all the image, the
PIC read this memory and then draw the image.

As my calculations, this memory should have 312,5 KB.

So, wich memory you indicates to me? Considering this relative number
of read/write and that it must be serial (my circuit board doesn't
have space to a parallel memory, and my PIC doesn't have ports to it).
Other important question is that I would like that this memory have a
API to read and write it ( I know that i2c do all this easily, but I
never have use it, so a API is a good one).

-- 
Thanks,
Frederico Schardong,
SOLIS - Open source solutions
www.solis.coop.br
Linux registered user #500582
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