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  1. Thread: I/O Expander

    by GeoJoe
    Replies
    4
    Views
    3,514

    I/O Expander

    This is the least useful response I've ever gotten from Microchip help. Anyway, does anyone know the answer? The question is: Do I need an external RC circuit for the clock generator on MCP23017....
  2. Thread: Ti Dac 7553

    by GeoJoe
    Replies
    5
    Views
    2,853

    DAC port adr

    VOUTB = 1000xxxxxxxxxxxx
  3. Thread: Ti Dac 7553

    by GeoJoe
    Replies
    5
    Views
    2,853

    Config reg 30001

    I had it set to XT instead of INTRC. I had to set it in the configuration programmer menu drop down though. I thought I had it set correctly in the code. Oh well I'll start working on getting the DAC...
  4. Thread: Ti Dac 7553

    by GeoJoe
    Replies
    5
    Views
    2,853

    Dac Pdf

    Here is the spec sheet on the DAC
    http://focus.ti.com/lit/ds/symlink/dac7553.pdf
    Sorry for the hodge podge
  5. Thread: Ti Dac 7553

    by GeoJoe
    Replies
    5
    Views
    2,853

    Files to are helpfull

    Here is the schematic
  6. Thread: Ti Dac 7553

    by GeoJoe
    Replies
    5
    Views
    2,853

    Ti Dac 7553

    I've got a big one here. I can't get the TI DAC output to change. Here is my test code:
    INTCON = %00000000 ' Enable TMR0 interrupts
    INTCON2 = %10000000 ' ENABLES PORTB PULL UPS
    'T0CON =...
  7. Replies
    3
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    12,252

    Thanks

    CURRENT1 = CURRENT1 - CURRENT1 >> 6
    Works great. Seems so clear now.
  8. Replies
    3
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    12,252

    Atod Digital Filter

    Hi all,
    I'm trying to digitally filter a noisy adcin value.
    Here is what I've tried.
    adcin 4, current ' INITIALIZE CURRENT MEASUREMENT FILTER
    CURRENT1 = CURRENT1 - CURRENT1 >> 6...
  9. Replies
    10
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    10,229

    We need it bad

    I am constantly battling between using C and PBP. I absolutely love PBP. I can get my work done far faster than with C. I have had to use C in the recent past to create BLDC motor controller that PBP...
  10. Thread: ICSP Help

    by GeoJoe
    Replies
    2
    Views
    3,299

    http://www.melabs.com/downloads/labx1sch.pdf I...

    http://www.melabs.com/downloads/labx1sch.pdf
    I don't think you have the MCLR connected correctly. Try wiring like the above and see what happens.
  11. Replies
    12
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    4,979

    If you haven't fixed it yet.......

    Here is what I have done.
    Bypassing, bypassing, bypassing. Make sure you have plenty of bypass capacitance on your pic power pins.
    In really bad situations I have had to put a small inductor on...
  12. Replies
    8
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    3,522

    Oh one more thing

    You should disable the interupts before the interupt routine then enable them again when it is complete.
    example:
    Disable ' Disable interrupts during interrupt handler
    tickint:
    Stuff...
  13. Replies
    8
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    3,522

    At least one thing is missing

    You need to clear the interupt flag again before resume.
  14. Use it and be happy

    It's always a good idea. Beside the MAX chips are very cool. The capacitor charge pumps are very cool circuits.
  15. Replies
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    5,927

    Finally a place where I can help

    I've built many boost supply circuits. Here are the main areas of failure I have found:
    P1. Inadequate gate voltage for non logic level FET.
    S1. Use a fet driver. This might seem like overkill but...
  16. Replies
    7
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    5,516

    Reading and writing successfully

    i2cwrite portc.4, portc.3, %01000010, %00000111, [%00000000] ' SET U9 PORT 1 TO OUTPUTS
    i2cwrite portc.4, portc.3, %01000010, %00000011, [acout] ' WRITE VARIABL ACout TO U9 PORT 1 LATCH REGISTER...
  17. Replies
    4
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    5,860

    Yes I would actually. Great idea. Especially now...

    Yes I would actually. Great idea. Especially now that I am coding a micro with 128k program space!
  18. Replies
    0
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    2,192

    18F87J50 Success

    Anyone have any successful 18F87J50 projects? I am working one out now. I have posted to serial communications area of this forum with an I2C issue. So far everything is working well for me. I'll be...
  19. Replies
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    5,516

    Ok ok

    Thanks Jeff.............
    An email to melabs support got me the answer. Here it is:
    I2Cread portc.4, portc.3, %01000000, command, [insin], noitwoc

    Where command is what register you want to read...
  20. Replies
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    5,516

    read command that is.

    read command that is.
  21. Replies
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    5,516

    My mistake. I've been changing the code and...

    My mistake. I've been changing the code and trying all kinds of different stuff. I had tried the write command just to see what happened and didn't change it back when I posted that reply. However I...
  22. Replies
    7
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    5,516

    Below is modified code. After re-reading (tfm)...

    Below is modified code.
    After re-reading (tfm) the spec i noticed that the 23016 requires: adress, command,adress (again), data, data,....
    No on reset I get the no i2c ack display and I see on my...
  23. Replies
    7
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    5,516

    Spec sheet

    http://ww1.microchip.com/downloads/en/DeviceDoc/20090C.pdf
  24. Replies
    7
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    5,516

    MCP23016 I2C serial I/O expander chip

    Hi all,
    Has anyone used the MCP23016 I/O expander with PBP? I can't seem to get the I2CREAD command to return anything. I'm using an 18F87J50. I have my LCD working and diagnostic LED's on my new...
  25. Replies
    3
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    5,549

    Thanks for the words of wisdom and ecouragement....

    Thanks for the words of wisdom and ecouragement. I have seen and read all of the fine print from ITT. I don't feel like it was a waste of time. I wish ITT would make it harder for people to graduate....
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