LCD and PIC18F4550

[SterlingY]

Thanks,

I'll try your solution when I get my stepper motors running. They seem to just vibrate, and I'm sure the wiring is correct as I had it working on a PIC16F877.

Cheers,

Sterling

[Darrel Taylor]

If your steppers are on PORTA or PORTB. ADCON1 will probably fix them too.
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[SterlingY]

I tried that:

DEFINE OSC 48

ADCON1 = $0F

' set variables:
x VAR BYTE
steps VAR WORD
stepArray VAR BYTE(4)
clear

TRISB = %11110000
PORTB = 255

Pause 1000

stepArray[0] = %00001010
stepArray[1] = %00000110
stepArray[2] = %00000101
stepArray[3] = %00001001


main:
if 1 = 1 then
steps = steps + 1
else
steps = steps - 1
endif

PORTB = stepArray[steps //4]
pause 2

GoTo main

[SterlingY]

you may wonder about some of the code. It was originally written for a button to determine the direction, but to make it less confusing, I just say 1=1 to get to the heart of the code. I could have taken it out, but it will go back in.

-Sterling

[Darrel Taylor]

I figured as much.

When I look at this page ...
http://www.sas.org/E-Bulletin/2002-0...ctro/body.html

Your phase sequence seems to be different.
I guess it depends on which pin connects to which phase.

Might try a little more than 2ms delay to start too.
<br>

[SterlingY]

I've monkeyed around with the delay, gone all the way up to 20ms.

I had this wiring working on another PIC, so I am pretty sure it should work, unless that program, written ASM was sending different bytes out the port.

I'll check, if I can decipher it.

Cheers,

Sterling

[SterlingY]

So I looked into the ASM code that sucessfully drove the motor, and made the BYTE output changes to match, but still no luck.

I'm wondering if it could have something to do with the chips high speed of 48MHz?

-Sterling