18F4523 beginner needing help to blink an LED...

[mackrackit]

I may have to try a sim again, when I tried it a few years ago... well it just plan was not worth the effort.

The PBP inc configs for this chip are HS on the OSC.

Does your sim have a resonator or something attached?

And you may have hit it about MCLR.

[cncmachineguy]

Well see Dave its like this: I have no idea if there is a resonator or not. I am guessing not. I didn't add 1. my entire circuit is the chip, an led, and a wire to Vcc for MCLR. But there are built in things like automatic tie in to pwr and gnd, so MAYBE? and I didn't even put a resistor in series with the LED. So these things make me go Hmmm. But the LED was blinking at what appears 1 sec rate.

[mackrackit]

Very interesting....

Does the LED burn out after awhile or do you have a place to set VDD to ~3 ?
Yes... I am being a smart _ _ _ now

[cncmachineguy]

in fact I think I could set it to ~3V, but I hooked her right from pin to ground, with uP at 5V. Left it running for 10 mins and still burning bright.

This may be a case of don't fully trust the sim. Sorta like the LED thread where Darrels sim showed the different levels of brightness for different resistor values. but in real life, it works great as you and Dhuston? said.

I don't mind a little smart $$. makes things fun

[thesparky]

I have seen the light! The LED is now flashing!

mackrackit,

I tried the code you supplied but there were some problems in compiling with a message about overwriting (sorry, I cant remeber what it said), so I pasted these into the .inc file instead, only because cncmachineguy hinted at this. I'm not sure why or how this worked but it has. I'll have to spend a few days looking through all the files to work out in my head what is happening. I guess it wasn't using the internal crystal in the initial settings amongst other things.

So a big thanks to everyone who has helped over the past few days. I never would have got there on my own...

If anyone in the future finds this thread and wants a copy of the .inc file with the mackrackit mods then just get in touch, but it is fairly easy to do yourself. The file is in the pbp directory, called 18F4523.INC. Just load it into a text editor and comment out the original config lines, using a semi-colon, and add the four new config lines, but without the @ sign. I made a backup of the original file incase I messed something up....

Thanks again everyone, and I expect I'll be in touch when I try to do the 12 bit a-d conversion, if I cant find the info using the search.......

[mackrackit]

COOL!!!!!

You just about have the overwriting error solved too. When you commented out the inc file to make the mods, stop there. PBP looks to the inc file for the configs, so if you want to set them in code space commenting the inc is what you do.
http://www.picbasic.co.uk/forum/showthread.php?t=543

There is another *.inc file that is handy. It is in 'program files/ microchip/mpasam suite/'. These inc's have all of the available config settings at the end of the file. Do not modify this file. It is for reference only.