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  1. Replies
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    Re: CRC Calculator Routine

    Hi Darrel,

    I can now also confirm your CRC calculation code works well. Finally got back to my weather station receiver coding and added the CRC routines. No problems at all, works as advertised....
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    Odd compile error...

    (I see this thread is quite inactive, maybe that means there is another more active ??)

    I am trying out Steves code for driving a 5110 screen (bought here...
  3. Shifting a whole array sideways by one bit ( >>1)

    I'm after a clue as to the least messy way to shift an array of 11 bytes by one bit right. Basically I have a situation where my program reads 88 bits of data from a pin into an array via a pulsin...
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    Re: CRC Calculator Routine

    Hey Darrel,

    If you have time, could you show me how you went from a polynomial to the constant used in the code ?
    I was using this web based calculator to try to understand it, but I'm missing...
  5. Replies
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    Re: CRC Calculator Routine

    denied :eek:

    Oh no not again.

    I took my best shot at it based on looking at some online CRC calculators and the CRC Wiki and thought it might work for what I wanted.
    Now that I've been...
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    CRC-8 with DT's routine ?

    Looking for some confirmation that DT's CRC calculation routine will work with CRC-8.

    This is two typical samples of what I have incomming from a Fine Offset WH2081 weather station transmitter....
  7. Re: Getting the first pulse every time with Pulsin ??

    True, I find the speed is fine too, just I seem to miss the first pulse occasionally. My 88 bit frame only come around every 48 seconds for about 100mS, so there is a long wait for a new frame and...
  8. Getting the first pulse every time with Pulsin ??

    Question (trying to be generic here rather than post lots of code).
    I want to confirm that the Pulsin statement MUST have both a leading and trailing edge to get a result. e.g. If my code loop does...
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    Code to sniff SPI bus with a PIC ?

    Before I embark on using the HopeRF RFM12 SPI transceiver on a new project I need to work out what the original commercial TX unit (that I'm going to be receiving from) sends in the way of...
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    PBP with the HopeRF RFM01 433Mhz module ?

    Hi all,

    I have desire to use a Hope RF brand RFM01 module to decode the data bursts from Fine Offset manufactured weather stations (sold under many other names). They use that module in the...
  11. PBP 2.60 and MCS 4.0.0.0 Martin PS. If you do...

    PBP 2.60 and MCS 4.0.0.0

    Martin
    PS. If you do something interesting with the code please let us in on it :-)
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    Are you actually sensing RPM from the spark...

    Are you actually sensing RPM from the spark source in your project (not sure if your posted project schematic is all of it or just some of it) ?
    If so I might be able to help suggest some things. If...
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    Hi, Many many years ago I did the development...

    Hi,
    Many many years ago I did the development for a GoKart (the racing kind) datalogger and instrument system, based on a HC11 In the R&D phase we spent more time in EMI suppression than in any...
  14. The complete opus in Longs

    Here it is. This works, and give you a corrected temperature and pressure reading from a Bosch BMP085 barometric pressure sensor.

    It requires a PIC18FXXXX MCU and use of PBPL compiler option....
  15. Mainly temperature dependant. I've not been...

    Mainly temperature dependant. I've not been able to show much sensitivity to light yet (indoors).
    Yes, the pressure reading is very 'active' so I used the maximum OSS and then 10x averaging as...
  16. Yes, I guess it could be done that way. I wonder...

    Yes, I guess it could be done that way. I wonder how much data in the table is just enough, that might be hard to workout ?
    Yes the sensor would be mated by the table to one PIC for life, and make...
  17. Hi Alain, I suspect my friend didn't tell me that...

    Hi Alain, I suspect my friend didn't tell me that so I couldn't fiddle with his sheet :D

    Yes, that indeed is the calibration data out of my BMP085 sensor.

    Good news.
    Tonight I finished...
  18. I did think of that early on. I think you need to...

    I did think of that early on. I think you need to map all possible pressure readings (at your needed precision) across your range, but then also map for every possible temperature change across all...
  19. Hi, If you can get a PIC16F84 to read and process...

    Hi, If you can get a PIC16F84 to read and process the data from a BMP085 into true pressure and temperature I'll eat my shorts !!

    My program has hit 5.5Kb in code size on an 18F PIC. Sure I know...
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    Much appreciated, as it is a full answer to the...

    Much appreciated, as it is a full answer to the question.

    To reiterate though for my benefit, and maybe others at my low level of understanding.

    If I use assembly style configs, either in my...
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    Thanks Alain, BTW, do you think I've just had a...

    Thanks Alain,
    BTW, do you think I've just had a run of strangely bad luck with my programming, or does it come this hard for you too ?

    (By bad luck I mean the fact that this config only broke...
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    I like to know whats going on, so I did it the...

    I like to know whats going on, so I did it the hard way...

    This config line kills Serout2 functionality.
    @ __CONFIG _CONFIG4L, _DEBUG_OFF_4L & _LVP_OFF_4L & _STVREN_OFF_4L

    This line...
  23. Replies
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    The plot thickens....

    OK, I've spent about three hours on this now, and I have made some progress, and no, all the suggestions above didn't turn out to be the cause, I tried all the Tris changes suggested, then rem'd them...
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    OK, I'll give that a bash shortly (when my first...

    OK, I'll give that a bash shortly (when my first morning coffee has taken effect).

    In my defense though, I originally had the Serout2 working on PortA.0 and it wouldn't work there, and I did have...
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    SEROUT2 broken on 18F4620 ?

    My kicked Black Cat is back...
    I ported my BMP085 test code from a 18F1220 to a 18F4620, and after reconfiguring the config directives, and checking port pins correct etc etc I expected my code to...
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