> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of solarwind
> Sent: 05 March 2009 06:42
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] AS1107 Driver - Did I do it right?
> >
> 
> Thanks for posting. My code is pretty much the same as yours. However,
> it seems that your chip does things a bit differently. According to
> the data sheet of my chip (I may be interpreting it wrong, however),
> the chip select line acts like a latch and should be strobed after 16
> bits have been clocked in

According to the datasheet you posted a link to you have interpreted
this incorrectly.  Check out the timing diagram on page 8, this is a
typical SPI peripheral that requires a chip select to be pulled low
before clocking data in, and the entire data word is internally latched
on the rising edge of the chip select.

Also why the 100us delays?  The device can accept a minimum clock period
of 100ns, you are massively slowing down the bus speed here.  Also why
are you bit-bashing the SPI?  Does the 18F part you are using not have
an MSSP unit?

Regards

Mike.

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