"hello world" with 18f6680

[dragons_fire]

ok, here is the last version of my code... still cant get it to work...

<code>

DEFINE OSC 20

TRISA = 0
TRISB = 0
TRISC = 0
TRISD = 0
TRISE = 0
TRISF = 0
trisg = 0

LCDA1 VAR PORTE.6
LCDB1 VAR PORTE.7
LCDC1 VAR PORTE.3
LCDD1 VAR PORTG.4
LCDE1 VAR PORTG.3
LCDF1 VAR PORTE.5
LCDG1 VAR PORTE.4
LCDDP1 VAR PORTG.2

LCDA2 VAR PORTD.2
LCDB2 VAR PORTD.3
LCDC2 VAR PORTE.0
LCDD2 VAR PORTG.0
LCDE2 VAR PORTG.1
LCDF2 VAR PORTD.1
LCDG2 VAR PORTD.0
LCDDP2 VAR PORTE.1

LCDA3 VAR PORTD.6
LCDB3 VAR PORTD.7
LCDC3 VAR PORTB.0
LCDD3 VAR PORTB.1
LCDE3 VAR PORTE.2
LCDF3 VAR PORTD.5
LCDG3 VAR PORTD.4

pause 500

'MAIN PROGRAM\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

start:
high LCDa1
high LCDb1
high LCDc1
high LCDd1
high LCDe1
high LCDf1
high LCDg1
high LCDdp1

high LCDa2
high LCDb2
high LCDc2
high LCDd2
high LCDe2
high LCDf2
high LCDg2
high LCDdp2

high LCDa3
high LCDb3
high LCDc3
high LCDd3
high LCDe3
high LCDf3
high LCDg3

pause 500
low LCDa1
low LCDb1
low LCDc1
low LCDd1
low LCDe1
low LCDf1
low LCDg1
low LCDdp1

low LCDa2
low LCDb2
low LCDc2
low LCDd2
low LCDe2
low LCDf2
low LCDg2
low LCDdp2

low LCDa3
low LCDb3
low LCDc3
low LCDd3
low LCDe3
low LCDf3
low LCDg3
pause 500
goto start
end
</code>

so it powers up, but it doesnt put and of the ports high.. there is only one LED connected, the rest of the pins arent connected. but i have put my meter across them to see if there is any voltage...

[mister_e]

3 things,

1. no configuration fuses.. make sure you set the right osc mode
2. disable all multiplexed analog converter, comparator, voltage reference or else fancy stuff
3. with 18Fs, you want to use LAT instead of PORT to avoid R-M-W behaviour. The best solution is often write to the whole port in one shot instead of using multiple High/Low lines.

[dragons_fire]

ok....

1. i wasn't sure how to set the fuses before, but since then i have discovered the .inc file, and i have changed them in there. if i try to add it to the code too, it says I'm overwriting code space.

2. i knew i had to do that... i just forgot...

3. i have never even heard of LAT.. is it in the manual? i had a quick look but couldn't find it there. and when you say write the whole port instead of multiple lines, do you mean all of portb at a time? or am i missing something??

thanks for the help.. i tried using a PIC18F before, and ran into a lot of problems too, so i put that project on hold for a while and went back to 16F's...

heres the thread about the Robot i built using a PIC18F6585.. http://www.picbasic.co.uk/forum/show...light=treadbot

[Darrel Taylor]

Awwwww,

I wondered what happened to the Treadbot.

Poor little guy. Back-burners such a lonely place. (except at my house, lot's of company there)

Hope you get back to it some day.
And I hope I can help out more when you do.
<br>

[dragons_fire]

yeah, it seemed to work until the motors got up to a certain speed, adn then it would just freeze.. i started this "project" just to learn the 18f

[b1arrk5]

If you put +5vdc on portd.4 does the LED light? If not then it's a hardware problem, if it does then try something really simple like;

DEFINE OSC 20
HIGH PORTD.4
END

Did the port go high? I took a quick look at the datasheet for you PIC, and I didn't see that PortD.4 is multiplexed, so it should work fine.

LAT is not in the manual, it is in the datasheet, it's a memory register, you've probably seen it as LATA, or LATB, etc.

Usually when I have this problem it's because I put the LED in backwards, even though I checked it three times before I soldered it.

Merry Christmas!

Jerry.

[dragons_fire]

i have actually made d.4 an I/O connection on my board.. there is three pins, ground, + and signal (just like a servo). so i had an LED hooked to it, but since then, i have just hooked up my multimeter, and its not showing any voltage across signal to ground when i put it high. i do get 5V across the + and ground. and i can write code to the PIC, and i can read the same code back off the PIC.. its a double stacked board, and i soldered the headers into both boards, so i may need to try to get them apart to look inside where the PIC is..