Simplest way to write to USB stick or TF/SD card with PBP?


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  1. #1
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    Default Simplest way to write to USB stick or TF/SD card with PBP?

    Hello.
    There are numerous of SD/TF/USB stick adapter boards for hobby purposes.
    I have couple of UBS stick datalogger by parallax, which are super easy to use, but they're not made anymore and were very expensive during it's time.
    There are some modules for TF card, USB flash drive, which seem to have support on Arduino and other platforms. like this one: https://hallroad.org/arduino-disk-re...-pakistan.html
    So the question is, had anyone used these with PBP? which one is easiest to use in terms of resources and programming skills?
    I need simple operation: Create text file with name of current time-date and write some logger data into it. That's all, no file reading, deleting, creating and so on.
    So will be this doable with 16F series chips, or I'll definitely need PIC18 and so on?

  2. #2


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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    I didn't know these existed. I found this document which shows that it can be interfaced in 8bit parallel, SPI or UART. Which means you can probably use a pic16 for a simple data logger. A may order a couple to see how they work.

    https://www.mpja.com/download/ch376ds1.pdf

  3. #3
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Well there are several solutions capable of doing this. FTDI has this: https://www.ftdichip.com/old2020/Products/ICs/VNC2.htm
    I've bought ones made by Parallax back in 2011, and they were around $45 ea now prices are about 8 times lower...

  4. #4
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    I had a PBP project to write to a SD card and it worked. That was many years ago and I don't remember the details of it, but it works. Attached is the sample code that I downloaded from the internet. Just change the file extension to PBP or copy paste the code into your program.


    sdfs3.zipsdfs3.zip
    "No one is completely worthless. They can always serve as a bad example."

    Anonymous

  5. #5
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    For data logging type applications I've had great success with the OpenLOG. Just send it ASCII data over a UART line and it will write it to a .txt file on an microSD card.

  6. #6
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Thanks!
    Any sample PBP code?
    for OpenLOG ?

  7. #7
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Again, for simple datalogging type applications there's really no need for any sample code. Just send it ASCII data over a UART line and it will write it to a .txt file on a microSD card. It CAN do more than that if needed, I suggest you read the documentation. Sparkfun (who I believe created (and should have all the credit) the OpenLOG) have a tutorial but I'm sure you've found that already...

  8. #8
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Their tutorial is quite weird.


    I do need additional hardware or can hook it to say PIC16F886 directly?
    Also, about Baudrate and other init options, it is not clear I need to do it each time on power up or just once?

  9. #9
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    No extra hardware needed.
    The easiest way is to put a config.txt, containing your desired options, on the SD card. See the Configuration File section of the tutorial.

  10. #10
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Thanks!
    I never used serial transmission with PICs, so I need SEROUT/SERIN statements to be used, right?

  11. #11
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Yes. SEROUT, SEROUT2 or HSEROUT/HSEROUT2 is what you want.

  12. #12
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    I've looked at these modules and besides TX/RX they also have CTS RTS pins. Can be these handled by PBP, or I have to add some manual code like this?

    Code:
    HIGH RTS 'make RTS pin high
    MAIN:
    IF CTS=1 THEN GOTO SEND 'wait while CTS gets high, before sending the data
    GOTO MAIN
    SEND: 'SOMETHING

  13. #13
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    PBP command SEROUT2 can handle flow control.
    With that said I've never needed to use it with OpenLOG but it depends on how much data and at what speed you you're trying to log.

  14. #14
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    So I just disregard these pins and let them float?

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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Look at the SERIN2/SEROUT2 commands in the manual.
    They allow you to specify optional flow control pins which you would connect to the RTS/CTS pins of the module you're using if it has hdw flow control.

    That may or may not work since the SERxx2 commands are bit-banged.
    SEROUT2 would probably be ok, but SERIN2 might have issues.

  16. #16
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    Default Re: Simplest way to write to USB stick or TF/SD card with PBP?

    Thanks, I'm only going to write to flash drive, so I'll need SERIN for just status checking, whenever drive is physically present.

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