gistfile1.txt

//a data pin
//b clock pin
//c control variable, temperature or humidity or nothing
//m most sig
//l least sig
//r result
//w waiting for d4

function sht.report {
    print "sht.report";
    hq.report("rawtemp", r);
}

function sht.wait {
    print "sht.wait";
    w = 1;
}

function sht.temperature.execute {
    print "sht.temperature.execute";
    // data pin
    a = 4;
    // clock pin;
    b = 8;
    c = 1;

    pinmode(a, 1);
    pinmode(b, 1);
    dw(a, 1);
    dw(b, 1);
    dw(a, 0);
    dw(b, 0);
    dw(b, 1);
    dw(a, 1);
    dw(b, 0);
    shiftout(a, b, msbfirst, 0b00000011);
    dw(b, 1);
    pinmode(a, 0)
    if (dr(a)) {
        print "ACK error 0";
    }
    dw(b, 0);
    if (!dr(a)) {
        print "ACK error 1";
    }
    print "wait for sht.wait";
    power.sleep(4, "sht.wait");
}

function sht.humidity.execute {
    c = 2;
    // TBD
}

function on.d4.low {
    print "on.d4.low";
    if (w && c) {
        if (c == 1) {
            // do temperature
            pinmode(a, 0);
            pinmode(b, 1);
            m = shiftin(a, b, msbfirst);
            pinmode(a, 1);
            dw(a, 1);
            dw(a, 0);
            dw(b, 1);
            dw(b, 0);
            pinmode(a, 0);
            l = shiftin(a, b, msbfirst);
            r = ((m << 8) | l);
            sht.clearcrc();
            sht.report();
        } else if (c == 2) {
            // do humidity
        } else {
            // do nothing
        }

        // Reset c.
        c = 0;

        // Reset w.
        w = 0;
    }
}


function sht.clearcrc {
    print "clearcrc";
    pinmode(a, 1);
    pinmode(b, 1);
    dw(a, 1);
    dw(b, 1);
    dw(b, 0);
}