The interrupts are wanted because they are there :)
Basically, there is already SPI code that does the busy-waiting.
I was hoping that I could add value to that code by utilizing interrupts.
Alas, my hardware isn't easily coaxed into such mummery.

Also, the existing code utilizes the SPI not SSP.
So, this also motivates my investigation.

Yeah, though, I'm considering tapping into button2;

On Sat, Aug 14, 2010 at 9:25 PM, David H. Madden <> wrote:

> On 08/14/2010 08:56 PM, Daniel Ferguson wrote:
>  You'll notice that,
>> SPI pin, MOSI(P0.18), is seemingly unexposed to the outside world.
>> So from my fresh-faced perspective, SPI is unusable on this board as-is.
> If I'm reading the lines right, P0.18 goes over to BUT2.  So it's not as
> easy as it could be, but you could probably tap it with a piece of wire-wrap
> wire.
>  In case I truly cannot use SPI(sans SSP), I need a backup plan...
>> SSP0 goes to the LCD. And, it's not exposed via headers as-is. so SSP0 is
>> out.
>> That leaves me with SSP1
>> So, SSP1 will do, but it doesn't let me use the interrupts that the
>> give me.
> I found the LPC23xx manual...looks like there's a SPI port and two SSP
> ports, which can operate in SPI mode. are they pinned out? ...
> Looks like SSP1 is pinned out to P0.[789], on EXT-2.  SSP0 shares pins with
> SPI.  SSP0 can also get pinned out to P1.23...which goes over to the LCD.  I
> haven't chased it all out, but I wouldn't be surprised if you can hook up
> SSP0 to the LCD by selecting some pins, and connect it somewhere else by
> selecting other pins.
> I haven't read thru the SSP chapter, but it's not entirely unusual for one
> of two otherwise-identical peripherals to have a little extra love in the
> interrupt or control-line department.
> If you absolutely need interrupts to write your code, you might be screwed,
> but IME on the LPCs, you can abstract stuff away pretty well, and just fake
> the interrupts by busy-waiting or whatever.  You can get your code running,
> and when you get the real hardware built, you shouldn't have _that_ much
> extra work to do.
> What are you putting on the SPI bus?
> --
> Mersenne Law LLC  ·  ·  +1-503-679-1671
> - Small Business, Startup and Intellectual Property Law -
> 1500 SW First Ave. · Suite 1170 · Portland, Oregon  97201
> _______________________________________________
> psas-avionics mailing list
psas-avionics mailing list

Reply via email to