PIC16F887 code help needed--- for C in CCS

rems · Joined: 02 Feb 2012 Posts: 56

Hello all,

Brand new member here. I need help with something that may be very simple for experienced person but not for me.

I really want to learn this stuff and feel a good start would be by seeing some sample code for what I want to accomplish.

I'm using a PIC16F887---C language---in MPlab---CCS

All I want to do is cycle 4 o/p pins of the pic to control 4 led's in such a way that they light up in binary sequence. For eg: Say I use pb0 to pb3 fo my 4 o/p's(pb3=msb and pb0=lsb)....I want it to cycle as follows:
1. output a low to all 4 pins for binary 0.
2. output a low to pb3, pb2 and pb1 but HI to pb0 for binary 1
3. so on and forth all the way to 10 or 11....
Basically, I will hook up my leds to these outputs and I want to watch them cycle from 0 to 10 in binary.
So when step one executes---no leds light
when step two executes then just the lsb o/p light the led.

I think everyone knows what I mean...Like I said its quite a simple program. It's just that I'm not to familiar with pics or c but have enough knowledge to work my way through sample code to learn from..

This would be a great deal appreciated by me and I hope someone can help me...Even just do the first couple cycles....say to 5 and I'll fill in the rest....comments would be great to but not completely necessary as I do have minimal experience,,,

Thanks a lot to everyone for this wonderful forum

REMS

temtronic · Posted: Fri Feb 03, 2012 6:25 am

I suggest you take the time to read the examples CCS kindly supplies in the examples folder as well as the manual. Both will show and explain everything you need to accomplish your project.
Once you've created the basic 'blinking LED' program, show us yuor atempts at coding and we'll help out.

rems · Joined: 02 Feb 2012 Posts: 56

rems · Joined: 02 Feb 2012 Posts: 56

am trying to use the following code to just verify that I can at least communicate with my PIC.

Ttelmah · Joined: 11 Mar 2010 Posts: 19348

Don't include the header files.
You should have _one_ code file called (say) "main.c", containing the code you have posted (with one extra line - see latter).
This file should be the only one included in the 'project'.
MPLAB will try to compile every file in the 'project' separately. The CCS header files _will not compile like this_. They only work if loaded from a 'main' program.

The extra line, is a _fuse_ line. This is _required:
#FUSES XT,NOWDT,NOPROTECT,NOLVP

So:

rems · Joined: 02 Feb 2012 Posts: 56

I realized I was writing my code in the wrong window...Embarrassed is an understatement.

I am getting the following error though now.

I/O error 103

Any ideas?

rems · Joined: 02 Feb 2012 Posts: 56

rems · Joined: 02 Feb 2012 Posts: 56

I found another poster with the same dilemma and he was told the following

"It was due to the compiler not selecting the correct compiler version in the compile ribbon."

How can I fix this?

rems · Joined: 02 Feb 2012 Posts: 56

And now I found this from delphi

"I/O Error 103:
IO Error 103L
ERROR_TOO_MANY_SEM_REQUESTS
MessageText:
The semaphore cannot be set again.
"

dyeatman · Joined: 06 Sep 2003 Posts: 1924 Location: Norman, OK

Are you trying to compile on a network? If so it is likely a network problem.
Try moving the files to your local hard drive.

If not, this can also be caused by one of your compiler files being held open
by another application. Make sure all other programs other than
MPLAB are closed before you compile.
_________________
Google and Forum Search are some of your best tools!!!!

rems · Joined: 02 Feb 2012 Posts: 56

I'm getting somewhere but still no complete luck.

I finally concluded that for some reason I need to have my test.c file preloaded into a folder. That way when I do "project wizard", I can add it then to my project.
What I was doing was going through "proj wizard" and adding no files. Once through the wizard, I would add my header file and then I would click on the FILE tab and choose" add new file to project". I would name it "anything.c". When the blank screen would come I would just copy and paste text I had waiting for me in a notepad window. This was causing me serious warnings and errors that I couldn't figure out.

Does this sound like"Well of course you idiot" or is this a fluke?

Can Someone clear this up?

I'm not reading anything on the pin that should be activated but at least the build is successful.

John Morley · Joined: 09 Aug 2004 Posts: 97

Hi Rems,

First of all, why did you start a THIRD thread on this problem?? Your style will quickly alienate people, and you won't get any help before long.....

Based on that now locked thread, here is a comment:

As far as your problem, it looks like you've got multiple source files in your project, 'CCS_44P_Demo.c' AND 'LEDBlink.c', which you cannot do with MPLAB/CCS 'C'. Did you create the MPLAB project from scratch, or just add to an existing project? In any event, you need to specify only one 'Source' file.

John
_________________
John Morley

rems · Joined: 02 Feb 2012 Posts: 56

Thank you John.

Honestly, I have looked all over for my original thread and couldn't find it. I tried my profile and whatever I could. Sorry to anyone that this caused confusion for.

John, what you said makes a lot of sense. Thank you. I kept doing Project Wizard and I would overwrite files that I tried before. I'm not too sure how it took multiple files but....

I now know that I can grab a pre-existing.c file during project wizard and build is successful.

Lesson learned...

All in all, my chip is pin is not responding on the chip still, but that is another problem I guess. I did program with pickit 2 after successful build. I am using an led to verify if the pin is turning on and off and nothing. The only pins that turn the led on are VDD.
So...Not sure what's up now..but will keep trying

Thank you

rems · Joined: 02 Feb 2012 Posts: 56

This is the code I am using now

rems · Joined: 02 Feb 2012 Posts: 56

I feel quite silly...
I have complete success...

I just realized that I need to import the hex file created by mplab into the PICKIT 2 software and WRITE it to my device...

I though that just by clicking on the PROGRAMMER tab within mplab and choosing my device, that I was done.. I mean it said PICKIT ready and my led would light up on VDD. Just no on the pins it was supposed to.

I went to the PICKIT software and imported the hex file and BAM...Led is blinking....

After sitting here all day, I can't describe the elation I feel right now. I'm sure everyone knows what I mean. Thank you to all who have helped. I'm sure whoever reads this will shake their heads as it was very silly of me. But hey..I wont make that mistake again.

Thanks all