nes-emu/apu/registers/NoiseLCL.js

A NES emulator

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _registers = require("../../registers");
var _constants = require("../constants");
/** Controls the length counter value of the Noise channel. */
class NoiseLCL extends _registers.WriteOnlyInMemoryRegister {
  constructor() {
    super();
    this.addReadOnlyField("lengthCounterLoad", 3, 5);
  }

  /** Updates the length counter, and volume envelope's start flag. */
  writeAt(__, byte) {
    this.setValue(byte);
    const channel = this.context.apu.channels.noise;
    channel.lengthCounter.counter = _constants.lengthTable[this.lengthCounterLoad];
    channel.volumeEnvelope.startFlag = true;
  }
}
exports.default = NoiseLCL;