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user91312

Member since Jun 2018 • Last active Jul 2018
  • 1 conversations
  • 2 comments

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  • in Interfacing
    Avatar for user91312

    @Gordon and @Wilberforce Many thanks for quick response. Suggestion to use new setWatch functionality for reading data pin exactly resolved timing issues with data readings.

    I am amazed how Puck.JS and Espruino JavaScript approach makes prototyping so easy including making easy publishing of data via BLE GATT service. We have submitted order for additional Espruino gatgets to learn even more.

  • in Interfacing
    Avatar for user91312

    Hello,
    I am trying to port Arduino C code to Puck.JS JavaScript
    and I think I have potential timing issue with use of setWatch on clock PIN
    to read data from data PIN similar to code below.

    Is it possible to find optimal solution to interpret my input PINs
    even with setWatch callback?
    I do not get consistent results reading the data and I am worried that
    only solution would be to have native code handling it?

    What I try to do - storing each data bit on clock edge to array (to be interpreted later)

    var req = 31; //mic REQ
    
    var dat = 1; //mic Data line
    
    var clk = 2; //mic Clock line
    
    var i = 0;
    var a=[];
    
    pinMode(clk, 'input_pullup');
    
    pinMode(dat, 'input_pullup');
    
    pinMode(clk, 'input_pullup');
    
    setWatch(function () {
            b = digitalRead(dat);
            if (i < 52) {
              a.push(b);
              i++;
            }
    
    
    }, clk, {
        edge: "rising",
        debounce: 0,
        repeat: true
    });
    

    Arduino code was similar to
    Arduino is using loop driven by CLK pin vs. Espruino based on JavaScript callback with set Watch for CLK edge...
    My HW is Puck.JS.

    void loop()
    { 
        digitalWrite(req, HIGH); // generate set request
        for (i = 0; i < 13; i++)
        {
            k = 0;
            for (j = 0; j < 4; j++)
            {
    
                while (digitalRead(clk) == LOW) {}
                while (digitalRead(clk) == HIGH) {}
                bitWrite(k, j, (digitalRead(dat) & 0x1)); // read data bits, and reverse order )
            }
            mydata[i] = k;
        }
    ...
    
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