Method beginProgramming

tools/xsbug/esptool.js:391–458

(timeout = 20_000, doFlash = function(){})

		return result;
	}
	async beginProgramming(timeout = 20_000, doFlash = function(){}) {
		const stop = timeout + Date.now();
		let baud = this.#baudDownload ?? 921600;
		let reset = this.#reset;

		for (let pass = 0; pass < 2; pass++) {
			await this.buildSerial(this.#baud);

			const syncPayload = new Uint8Array(4 + 32);
			syncPayload[0] = 0x07;
			syncPayload[1] = 0x07;
			syncPayload[2] = 0x12;
			syncPayload[3] = 0x20;
			for (let i = 0; i < 32; i++)
				syncPayload[i + 4] = 0x55;
			let synced = false;

		syncLoop:
			for (let retry = 0; retry < 5; retry++) {
				if (reset) {
					await doFlash(true);
					this.#serial.set({DTR: false, RTS: true});

					await delay(100);

					this.#serial.set({DTR: true, RTS: false});

					await doFlash(false);

					await delay(50);

					this.#serial.set({DTR: false});
				}

				for (let i = 0; i < 4; i++) {
					if (Date.now() > stop)
						break syncLoop;
					this.#serial.purge();
					this.command(Bootloader.SYNC, syncPayload.buffer);
					const received = await this.getReply();
					if (received && this.parseReply(received, Bootloader.SYNC)) {
						synced = true;
						break syncLoop;
					}
				}
			}
			if (!synced)
				throw new Error("Unable to enter programming mode");

			await this.deployStub(this.#loader);
			console.log("change to baud rate of " + baud);
			await this.changeBaud(baud, this.#baud);

			if (("esp32" !== this.#mcu) || (undefined !== this.#baudDownload))
				break;

			try {
				const DR_REG_SYSCON_BASE = 0x3ff66000;