ADXL362 with Puck.js

Try changing:

function SPIwriteOneRegister(regAddress, regValue, spi){
    spi.write([0x0A, regAddress, regValue]);
}

to

function SPIwriteOneRegister(regAddress, regValue, spi){
    spi.write([0x0A, regAddress, regValue], D31);
}

... you weren't specifying a 'CS' pin, so the writes likely wouldn't have been working.

Also, if you change:

function SPIreadOneRegister(regAddress, spi){
    var d = spi.send([0x0B,regAddress,0x00], D31);
    return d[2];
}

to

function SPIreadOneRegister(regAddress, spi){
    var d = spi.send([0x0B,regAddress,0x00], D31);
    print(d);
    return d[2];
}

Then what sort of things are printed to the console?