Rook

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• Trouble when collecting data into file

  @Rook started

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  @Gordon replied
• Trouble when collecting data into file

  in Puck.js, Pixl.js and MDBT42 • 4 years, 4 months

  

  Hi all:

  Recently, I am trying to collect analog data into the flash and save as a file by using MDBT42Q.
  Below is the example code in the Data collection part I used to explain my trouble:

  var storage = require("Storage");
  var FILESIZE = 65536;
  var count = 0;
  var file = {
    name : "",
    offset : FILESIZE, // force a new file to be generated at first
  };
  
  // Add new data to a log file or switch log files
  function saveData(txt) {
    var l = txt.length;
    if (file.offset+l>FILESIZE) {
      // need a new file...
      file.name = file.name=="log2"?"log1":"log2";
      // write data to file - this will overwrite the last one
      storage.write(file.name,txt,0,FILESIZE);
      file.offset = l;
    } else {
      // just append
      storage.write(file.name,txt,file.offset);
      print(count);
      count += 1;
      file.offset += l;
    }
  }
  
  // Write some data
  setInterval(function() {
    saveData(getTime()+","+E.getTemperature()+"\n");
  }, 10);
  

  The trouble is that: When I change the FILESIZE bigger than 32*1024(32768), my Web IDE will just stuck and return nothing.
  I have try require("Storage").eraseAll(), reset() and save(), it is all useless.
  In the attachment is some information about my memory usage.

  Thank you guys very much!