Search found 16 matches

DOSonAChip can be bought pre-mounted with SD socket on a module from
www.sparkfun.com
Im not affiliated with them in any way, but they do some cool stuff.

I like the output pin/pulsewidth idea best. Thats a great trick I didnt think of at all! Thanks.

Ill run the routine multiple times to get a larger sample however for accuracy, but thats such a sim ...

What is the easiest way to benchmark a routine in CCS?

Ive been doing lots of optimisations and would like to know how much ive increased the speed, its also usefull to know the absolute time for t ...

If you take a look at my site
www.pyrofersprojects.com/3dcube.php

you will see why i need to optimise speed so much. Ive pushed the limits here of what I can do with the pic. The slowest part is t ...

Ok, here is the routine that sends the data to the lcd

SSPEN=0;
output_low(LCDCLOCK);
output_high(LCDDATA);//send data
output_high(LCDCLOCK);
...

Thanks for that!

I was always taught when programming in C to avoid globals like the plague. I dont know why, my tutor came up with some excuses but I never really beleived them. I guess I just tri ...

mysend has now been optimised, its basically a 9bit spi routine, there is only so much that can be done.

Would having the data byte as a global so it doesnt need to get passed to mysend be any quic ...

ive done the suggested improvments, changed the format of the for loop and put the mysend inline. Its faster, but not dramatically so.

I will still try the inline asm I think. I will have to benchm ...

Thank you. Dance done, all working. Hardware SPI now takes care of 8bits out of the 9.

THANK YOU!!

Oh god that will save me so much trouble if it works. Ill compile it tonight and hopefully be jumping for joy as previously suggested.

The SPI mode is low to high, so the hardware SP ...

I cant get the SPI port to work as I need 9 bits.

If you can tell me how to make the hardware SPI port output 9bit I will leap up and down screaming eureka!
I have the port spare, and am in fact u ...

Nokia 6100 LCD.

No, i cant change the input mode to anything else.

Thanks for your help.
Ill put the existing mysend routine inline, but I still need to optimise that into asm as im sure it could be done better than how ive got it in C.

Are you sure?

The guy who suggested this was pretty clear that the for loop would slow things down.

I doubt that the compiler puts 128 calls to mysend in a line and jumps into that list, as its ...

I need to improve the speed of a loop, and its been suggested that I take it from a C loop, to an unlooped goto in asm.

for (x=0; x<width; x++) mysend(data);

This can be d ...