Method changeBaud

tools/xsbug/esptool.js:729–740

(baud, previous = 0)

		throw new Error(`readRegister ${address.toString(16)} failed`);
	}
	async changeBaud(baud, previous = 0) {
		const view = new DataView(new ArrayBuffer(8));
		view.setUint32(0, baud, true);		// little-endian
		view.setUint32(4, previous, true);	// little-endian
		await this.command(Bootloader.CHANGE_BAUDRATE, view.buffer);
		if (!this.parseReply(await this.getReply(), Bootloader.CHANGE_BAUDRATE))
			throw new Error("change baud failed");

		await this.buildSerial(baud);
		await new Promise(resolve => setTimeout(resolve, 50));
		this.#baud = baud;
	}
	async downloadToFlash(data, offset, compress = false, progress) {
		const uncompressedByteLength = data.byteLength;
		const FLASH_WRITE_SIZE = 16 * 1024;