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Thanks to both of you!

sseidman - I have seen your posts and thanks for code! I've had to 'fix' my present version to handle things it didn't do, so I know it's not a big deal.

ckielstra - Kno ...

Hi all,

I've been away from PIC stuff for a bit but I have a new project that may use one of the 18F2431 series (for the quadrature input feature). I'm still back in V3.182 which doesn't support i ...

Anyone know anything about the CCS RS485 mode (under Configuration in SIOW)?

I assume it allows talking to a PIC via 485 (using a 232-485 converter), but there is no help on it - like what's used f ...

On the display subject, you may want to look at the Nokia 3310 display. It's very thin and small, 2-something to 3.3V, B&W, graphical (84 x 48), serial interface. You can do 6 lines by 14 characte ...

I sent an email about this to CCS and got a reply within a hour:

There are two separate issues.

1. The ICD-U40 can supply 5V to your target if you install a jumper inside the unit. As shipped t ...

I'm getting ready to change a board over to 3.3V supply. I've read thru the posts on using the ICD-U40 at 3.3V and the CCS documentation but I'm still a bit confused.

As I understand it, the Vdd pi ...

DOH!

I do that all the time. I also do this:

x>>2;

thinking

x= x>>2;

Fixed.

I'm not real hot at PIC assembly (which is why I use CCS!), but couldn't the "while(loop--)" code be replaced with assembly like this:

decfsz loop_l // loop_l is the low order byte of loop ...

And for CF:

http://www.walrus.com/~raphael/html/mp3.html

This is read only and is geared towards MP3, but can be extended to support general rd/wr. I have used it and modified it - seem to work ...

Solder braid is your friend for doing fine pitch soldering. I often solder on chips with down to 0.5mm pitch by hand using a regular weller iron. shorts all over, then clean up with solder braid, m ...

Yes val2.w[1] - sorry 'bout that.

On the error; the faster way may cause some truncation error. I thought the method I proposed would not cause a problem. I just simulated it on a PC and found no v ...

Yes, I did it like this:

int8 m0;
int8 m1;
int8 m2;
int8 m3;

int32 quot;
int32 quot2;
int16 proda16;
int16 prodb16;

union
{
int16 w[2];
int32 d;
} val;

union ...

Ok, here is a way to speed things up I think.

Basically division is slow (except for powers of 2). So, instead of dividing by 1e6, multiply by 4295/2^32 which is close to /1e6

But, since your fo ...

You can always find something to optimize the code - it just takes time. I remember spending a month or so on about 50 lines of code (a filter) on the first TI DSP (oops I'm dating myself). But each l ...

oops, sorry 'bout that. Did you use a 32 by 16 divide routine? If you use the 32 by 32 it would be slower and bigger.

- SteveS