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import {
avrInstruction,
AVRTimer,
CPU,
timer0Config,
timer1Config,
timer2Config,
AVRIOPort,
AVRUSART,
portBConfig,
portCConfig,
portDConfig,
usart0Config,
} from 'avr8js';
import { loadHex } from './intelhex';
import { MicroTaskScheduler } from './task-scheduler';
// ATmega328p params
const FLASH = 0x8000;
export class AVRRunner {
readonly program = new Uint16Array(FLASH);
readonly cpu: CPU;
readonly timer0: AVRTimer;
readonly timer1: AVRTimer;
readonly timer2: AVRTimer;
readonly portB: AVRIOPort;
readonly portC: AVRIOPort;
readonly portD: AVRIOPort;
readonly usart: AVRUSART;
readonly speed = 16e6; // 16 MHZ
readonly workUnitCycles = 500000;
readonly taskScheduler = new MicroTaskScheduler();
constructor(hex: string) {
loadHex(hex, new Uint8Array(this.program.buffer));
this.cpu = new CPU(this.program);
this.timer0 = new AVRTimer(this.cpu, timer0Config);
this.timer1 = new AVRTimer(this.cpu, timer1Config);
this.timer2 = new AVRTimer(this.cpu, timer2Config);
this.portB = new AVRIOPort(this.cpu, portBConfig);
this.portC = new AVRIOPort(this.cpu, portCConfig);
this.portD = new AVRIOPort(this.cpu, portDConfig);
this.usart = new AVRUSART(this.cpu, usart0Config, this.speed);
this.taskScheduler.start();
}
// CPU main loop
execute(callback: (cpu: CPU) => void) {
const cyclesToRun = this.cpu.cycles + this.workUnitCycles;
while (this.cpu.cycles < cyclesToRun) {
avrInstruction(this.cpu);
this.timer0.tick();
this.timer1.tick();
this.timer2.tick();
this.usart.tick();
this.cpu.tick();
}
callback(this.cpu);
this.taskScheduler.postTask(() => this.execute(callback));
}
stop() {
this.taskScheduler.stop();
}
}
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