12f675 probably a silly question

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  1. - 19th November 2006, 19:50 #1
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    Default 12f675 probably a silly question

    Hi folks,

    I've been using 16f819s for a while now and needed a smaller package for a space restricted installation, so I got a handfull of 12f675s.

    I'm using PBP and the 4.x melabs programmer and putting a 4k7 to vdd for MCLR. Nothing else is being set specifically, except of course intosc, watchdog enabled, brownout enabled and powerup enabled.

    The chip will not start. All I did to test it was put a 220 to a led from GP5, pretty standard test.

    Checked voltages and led wiring and everything is as it should be.

    Is there startup files that need to be included with this chip?

    help?

    Gary
  2. - 19th November 2006, 21:18 #2
    Kees Reedijk's Avatar
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    I tried this code and that should work:

    'flash that led!
    @ device pic12F675, intrc_osc, wdt_on, pwrt_on, mclr_off, protect_off

    ANSEL = 0
    CMCON = 7
    TRISIO = 0
    GPIO = 0

    LED VAR GPIO.5

    loop:
    Toggle led
    Pause 100
    goto loop

    End
  3. - 19th November 2006, 21:36 #3
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    Hi Gary,

    It's hard to tell without the code you're using, but here's something to look at.

    INTOSC, is the same as INTRC_OSC_CLKOUT. Which means that FOSC/4 (1mhz) will be put out on GP4. If you have an o-scope, you can look for this signal to see if the processor is running or not.

    If there is anything attached to GP4, it could also cause the chip to reset from over-current.

    >> I'm using PBP and the 4.x melabs programmer

    Is that 4.1? If so, look at the Code window in meProg.exe. (View | Memory)
    Open the HEX file and press the program button. Now look at location 0000 in the code window. Has it changed?

    There's a bug in that version that sometimes causes the first word to change to 0000h, which makes the program not run. If that's the case, you can download the 4.2 beta from the melabs website.

    Here's a simple blink program for the 12F675...
    Code:
    @  device  pic12F675, intrc_osc_noclkout, wdt_off, mclr_off, protect_off

CMCON = 7
ANSEL = 0

Main:
    TOGGLE GPIO.5
    pause 500
goto Main
    <br>

    ADDED: Kees, intrc_osc isn't valid for a 12F675
    DT
  4. - 19th November 2006, 22:15 #4
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    Default 12f675

    Thanks guys. It's always something stuipd, and this time is no exception. If you want a GPIO port to be a port, you have to define it as a GPIO.x not portb.x as I am obviously far too accustomed to. Ports were not defined as evidenced by the floating voltage.

    She's avery pretty blinking led!

    Thanks again.
    Gary
  5. - 19th November 2006, 23:13 #5
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    PORTB is already define but leads you to Register addr 6... wich is unimplemented on this PIC

    PORTA is assign to register addr 5, wich is GPIO

    in the above, if you replace GPIO by PORTA, it will work.

    Not a good practice but...
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  6. - 20th November 2006, 00:12 #6
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    Hmm, never realized PORTA and B were in there.
    That's odd about PORTB pointing to an unimplemented register. It keeps the compiler from finding problems like what Gary had.

    12F675 How do I address thee, let me count the ways.<pre>PORT TRIS<br>-------------<br>GPIO TRISIO<br>PORTA TRISA<br>PORTL TRISL<br>PORTH TRISH</pre>or you can use PIN numbers...<pre>HIGH 5 ; will set GPIO.5 to OUTPUT HIGH<br>or <br>TOGGLE 5</pre>Although a bit strange...

    <pre>TOGGLE 13 ; will also toggle GPIO.5</pre>
    OK, so that's only 6, who's got number 7 ??
    DT
  7. - 20th November 2006, 02:12 #7
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    PORT TRIS
    -------------
    GPIO TRISIO
    PORTA TRISA ' errr... PORTB?
    PORTL TRISL
    PORTH TRISH
    But... for #7, if there's .... euhhh
    Last edited by mister_e; - 20th November 2006 at 02:43.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  8. - 20th November 2006, 02:58 #8
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    LMAO!! NEVER MIND i contradict myself... and i will leave it like THAT

    Code:
    @GPIO_5=ADCS1
GPIO_5 con ext

Toggle GPIO_5
    Work and everything assign to 5

    So i guess we could talk more than 7... for what it worth

    @GPIO_5=RAM_START-15
    GPIO_5 con ext

    and so on
    Last edited by mister_e; - 20th November 2006 at 03:18.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  9. - 20th November 2006, 04:16 #9
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    That's what I'm talking about!

    Functioning Brain Cells.

    &nbsp; @GPIO_5=ADCS1

    But really, it's just a GPIO_5 CON 5. So I'm not going to give you #7 on it.

    You're so close.
    When I first looked, I thought you had it. But after a second glance, the buzzer went off.

    <script type="text/javascript" src="http://www.darreltaylor.com/files/AudioDo2.js"></script><script>WriteSound("Thinking","http://www.darreltaylor.com/files/jeopardy.wav")</script>
    <table><tr><td width=150 onMouseOver="PlaySound('Thinking')">This Might Help</td><td>(except for dwayne)</td></tr></table>
    DT
  10. - 20th November 2006, 04:20 #10
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    Nice tune, O.K let's try something else...

    Something around ...
    Code:
    asm
PORT1=ADCS1
PORT2=GPIO
PORT3=TRISIO-0x80
endasm
PORT1 VAR BYTE EXT
PORT2 VAR BYTE EXT
PORT3 VAR BYTE EXT
Toggle PORT1.5
Toggle PORT2.5
Toggle PORT3.5
    Last edited by mister_e; - 20th November 2006 at 04:37.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  11. - 20th November 2006, 04:49 #11
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    <embed NAME="RimShotSound" SRC="http://www.darreltaylor.com/files/rimshot.wav" AUTOSTART="true" WIDTH="0" HEIGHT="0">
    We have a Winner!

    But I liked the way you had it at first, better.
    Code:
    @GP=5
GP  VAR BYTE EXT

TOGGLE  GP.5
    Ok, so let's see what you have won ...... what have I got here ....

    Congratulations!, you've won my respect as a programmer.
    Oh, wait a minute, you already had that.

    I need to get a sponser, give away some cool stuff :)
    <br>
    DT
  12. - 20th November 2006, 04:54 #12
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    Well you teach it to me on the EXT modifier thread, so i'm only a good student...

    Here's what i have for you.. mmm
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  13. - 20th November 2006, 08:42 #13
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    How do you know that he drinks?





    --------------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  14. - 20th November 2006, 09:00 #14
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    I thought it might be evident from some of my earlier posts.

    But if it's not showing through .... I guess it's ok to have another one of those "Darn Good" Beers.
    <br>
    DT
  15. - 20th November 2006, 09:02 #15
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    Yup i remind a thread with a little pic with 'I will work for Beer'
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  16. - 20th November 2006, 09:09 #16
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    there you go
    http://www.picbasic.co.uk/forum/show...82&postcount=8
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  17. - 20th November 2006, 09:24 #17
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    Don't let Chinese hear about what you work for!



    -----------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  18. - 20th November 2006, 09:26 #18
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    oh well a beer it's about a month of their salary anyway...
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  19. - 20th November 2006, 17:46 #19
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    Smile

    A late entry …
    Code:
    TRISIO = 0
FSR = $05
Main:
INDF.5 = 1
INDF.5 = 0
GOTO Main
    Paul Borgmeier
    Salt Lake City, UT
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    __________________
  20. - 20th November 2006, 20:14 #20
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    WOOHOO!

    We have a #8

    <table><tr><td>Way to go Paul! &nbsp; &nbsp; </td><td>
    Now we're cooking with Gas!</td></tr></table>
    <br>
    DT
  21. - 20th November 2006, 23:33 #21
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    Default 12f675

    So, I'm confused. Why would you define the port as anything except a gpio?

    Also, I keep seeing statements at the top of the code that starts with "@", but when I put that in, the compiler gets all cranky..

    Gary
  22. - 21st November 2006, 05:22 #22
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    > Why would you define the port as anything except a gpio?

    Absolutely no reason at all. Unless you just want to be different.

    Sorry for the confusing variants.

    We're just having a little mental exercise about how many ways you could reference a pin on a 12F675. I guess your question provided a good place to have some fun.

    I think everyone will agree that GPIO is the proper way to go. But knowing if there's something better is .. well, better.
    <br>
    DT
  23. - 21st November 2006, 05:40 #23
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    Quote Originally Posted by Meriachee
    So, I'm confused. Why would you define the port as anything except a gpio?

    Also, I keep seeing statements at the top of the code that starts with "@", but when I put that in, the compiler gets all cranky..

    Gary

    Meriachee,

    If you like to see how it goes, try posting a working code say 20 lines, and then ask here that you need the code with less code size.

    And then watch what will happen.


    -------------------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  24. - 21st November 2006, 14:22 #24
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    Yeah sometimes it disgress a little bit

    Nice one Paul
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
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