You are reading a single comment by @Gordon and its replies. Click here to read the full conversation.
  • 1300 kBytes? Wow - and I was getting fed up with the ~120k of Nordic softdevice :)

    Can you see any obvious ways to speed up shiftOut? I guess minifying and maybe unrolling the 16 entry FOR loop would help a bit, but I'm not sure how much.

    It did look like maybe jshPinSetValue on ESP32 could skip the mapping call (if that were in PinSetState) and that might help?

    I guess for convertArray you could do:

    g = Graphics.createArrayBuffer(64,32,8); // 8 bits to make shifting easier
    // 64x16=1024
    ledBuf = new Uint8Array(1024);
    ledBuf.set(new Uint8Array(g.buffer)); // fill first part
    // now use 32 bit arrays to mash 4 pixels together at once
    var s = new Uint32Array(g.buffer,1024,1024);
    var d = new Uint32Array(ledBuf.buffer);
    for (var i=0;i<256;i++) d[i]|=s[i]<<4;

    Not tested, but that should work - I guess it may still not be that fast but it should be an improvement.


Avatar for Gordon @Gordon started