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On Tue, Mar 28, 2006 at 07:25:12PM +1000, amanda wynne wrote:
> Basically, I hate starting from a blank sheet of paper, almost as much as I
> hate
> re-inventing the wheel.
If you want something easy that saves you time then RS232 is much easier than
USB.
There are lots of micros with built-in RS232 UART and it isn't hard to make a
soft-coded UART on a PIC chip. The only advantage of USB for a data logging
application is the easier voltages. Yes USB is faster, but how much bandwidth do
you need?
>
> Any pointers, even search terms to throw at google, would be appreciated.
>
I was making some progress with the PIC18LF2455 which supports native USB2
on the chip. To implement a minimal circuit that will boot and talk USB2
is only half a dozen parts. I've got some PIC code that at least gets it to
turn up in /proc/bus/usb/devices and I started with writing a Linux device
driver but the USB layer in Linux has been changing and I haven't had time
to keep up with it so you probably want to write your own driver.
I even have a prototype board you can borrow if you want to just test
the concept and see what you think of the chip.
I did have MPASMWIN.EXE running under wine at one stage, never got the IDE
to fully settle down but the IDE doesn't help much if you are testing a
comms protocol because it won't emulate the other side of the conversation.
- Tel
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