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209f3a3aef
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55 lines
2.0 KiB
JavaScript
55 lines
2.0 KiB
JavaScript
// SPDX-License-Identifier: MIT
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// Copyright (c) Uri Shaked and contributors
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const CLKPCE = 128;
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export const clockConfig = {
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CLKPR: 0x61,
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};
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const prescalers = [
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1, 2, 4, 8, 16, 32, 64, 128, 256,
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// The following values are "reserved" according to the datasheet, so we measured
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// with a scope to figure them out (on ATmega328p)
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2, 4, 8, 16, 32, 64, 128,
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];
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export class AVRClock {
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constructor(cpu, baseFreqHz, config = clockConfig) {
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this.cpu = cpu;
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this.baseFreqHz = baseFreqHz;
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this.config = config;
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this.clockEnabledCycles = 0;
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this.prescalerValue = 1;
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this.cyclesDelta = 0;
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this.cpu.writeHooks[this.config.CLKPR] = (clkpr) => {
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if ((!this.clockEnabledCycles || this.clockEnabledCycles < cpu.cycles) && clkpr === CLKPCE) {
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this.clockEnabledCycles = this.cpu.cycles + 4;
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}
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else if (this.clockEnabledCycles && this.clockEnabledCycles >= cpu.cycles) {
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this.clockEnabledCycles = 0;
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const index = clkpr & 0xf;
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const oldPrescaler = this.prescalerValue;
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this.prescalerValue = prescalers[index];
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this.cpu.data[this.config.CLKPR] = index;
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if (oldPrescaler !== this.prescalerValue) {
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this.cyclesDelta =
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(cpu.cycles + this.cyclesDelta) * (oldPrescaler / this.prescalerValue) - cpu.cycles;
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}
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}
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return true;
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};
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}
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get frequency() {
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return this.baseFreqHz / this.prescalerValue;
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}
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get prescaler() {
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return this.prescalerValue;
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}
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get timeNanos() {
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return ((this.cpu.cycles + this.cyclesDelta) / this.frequency) * 1e9;
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}
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get timeMicros() {
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return ((this.cpu.cycles + this.cyclesDelta) / this.frequency) * 1e6;
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}
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get timeMillis() {
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return ((this.cpu.cycles + this.cyclesDelta) / this.frequency) * 1e3;
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}
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}
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