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Can't write to micro SD card after it's removed, replaced — Parallax Forums

Can't write to micro SD card after it's removed, replaced

Chad1Chad1 Posts: 26
in General Discussion
Hi all,

I'm wondering if I can get help resolving the following issue. I'm debugging a portion of code that writes the date and time to a micro SD card (I'm using the propeller as an RTC). The date and time are sent after a pushbutton is pressed. I can successfully write data to the micro SD card upon every button press...that is, until I remove the micro SD card. When I re-insert it, I can't write any more data until I clear EEPROM and re-compile the code. Can someone tell me why and how to correct this problem?

Micro SD Card connector: http://www.digikey.com/product-detail/en/101-00660-68-6/101-00660-68-6-1-ND/2187099

Code Snapshot:
lkaXkEj.png

Comments

  • Peter JakackiPeter Jakacki Posts: 10,193
    If you eject the card it needs to reinitialize the card itself definitely and usually remount the file system. Put in a test to see if the card has just been inserted and do these two things at that time.
  • MacTuxLinMacTuxLin Posts: 821
    Which object are you using?
  • Chad1Chad1 Posts: 26
    Oops, sorry for not specifying. I'm using the PropBOE MicroSD object.
  • PublisonPublison Posts: 12,366
    Would that be the code on this page?

    http://learn.parallax.com/tutorials/language/spin/propeller-board-education-project-builders/sd-card-data-storage
  • Chad1Chad1 Posts: 26
    Yes, the object I'm using is the same PropBOE MicroSD object referenced in the link.
  • Chad1Chad1 Posts: 26
    Peter Jakacki wrote: »
    If you eject the card it needs to reinitialize the card itself definitely and usually remount the file system. Put in a test to see if the card has just been inserted and do these two things at that time.

    Peter,

    Not sure how to go about doing this in spin. Because I don't understand how my system knows that the micro SD card was removed, I can't really go about writing a test for it.

    Regarding the card needing to be reinitialized, if you look at my code it looks like I'm re-initializing every time the program counter enters the loop. If you mean to do something else, can you provide example code/statements to better illustrate your thought?
  • Chad1Chad1 Posts: 26
    edited 2016-05-15 22:22
    I discovered that all my problems go away when I remove the Parallax programmer USB dongle from the system after I write the code to EEPROM and before I execute the program. I had been testing with the USB dongle remaining plugged in. Not sure what's happening here but I thought I'd at least mention the discovery.
  • PublisonPublison Posts: 12,366
    Chad1 wrote: »
    I discovered that all my problems go away when I remove the Parallax programmer USB dongle from the system after I write the code to EEPROM and before I execute the program. I had been testing with the USB dongle remaining plugged in. Not sure what's happening here but I thought I'd at least mention the discovery.

    Then it would help if you include all your code. Use the Propeller tool and archive the project and post the zip file.


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