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/* XYMini Sender - Minimal implementation of file transfer through serial
* Copyright (C) Ernesto Castellotti <mail@ernestocastellotti.it>
* SPDX-License-Identifier: MPL-2.0-no-copyleft-exception
*
* Warning: This does not comply with XMODEM and YMODEM standards
*/
const STX = 0x02;
const ACK = 0x06;
const NAK = 0x15;
const EOF = 0x04;
const XYMINI_1K_MAGIC = 0x43;
const PAYLOAD_LEN = 1024;
const BLOCK_LEN = PAYLOAD_LEN + 5;
const CRC_POLY = 0x1021;
function uint16 (n) {
return n & 0xFFFF;
}
function updateCrc(crcIn, incr) {
const xor = uint16(crcIn >> 15);
let result = uint16(crcIn << 1);
if (incr) {
result = uint16(result + 1);
}
if (xor) {
result = uint16(result ^= CRC_POLY);
}
return result;
}
function crc16(data) {
let crc;
for (let i = 0; i < data.length; i++) {
for (let j = 0x80; j; j >>= 1) {
crc = updateCrc(crc, data[i] & j);
}
}
for (let n = 0; n < 16; n++) {
crc = updateCrc(crc, 0);
}
return crc;
}
async function detectXYMini(reader) {
const textDecoder = new TextDecoder();
while (true) {
const { value, done } = await reader.read();
if (value[0] == XYMINI_1K_MAGIC) {
console.log("XYMini: detected");
break;
}
}
}
function generateXYMiniBlock(blockId, payload) {
let buf = new Uint8Array(BLOCK_LEN);
let i = 0;
buf[i++] = STX;
buf[i++] = blockId;
buf[i++] = 0xFF - blockId;
if (payload.length > PAYLOAD_LEN) {
throw new Error("Payload too large to be transmitted in one block");
}
for (let j = 0; j < payload.length; j++) {
buf[i++] = payload[j];
}
while (i < BLOCK_LEN - 2) {
buf[i++] = 0xFF;
}
let crcBuf = buf.slice(3, PAYLOAD_LEN + 3)
let crc = crc16(crcBuf);
buf[i++] = (crc >> 8) & 0xFF;
buf[i++] = crc & 0xFF;
return buf;
}
async function sendXYMini(portReader, portWriter, data, baudRate = 115200, progressCallback) {
let blockId = 1;
let size = data.length;
let i = 0;
let nakN = 0;
let wrongCharN = 0;
await detectXYMini(portReader);
while(true) {
const payloadSize = Math.min(PAYLOAD_LEN, size);
if (size) {
const payload = data.slice(i, payloadSize + i);
const block = generateXYMiniBlock(blockId, payload);
await portWriter.write(block);
} else {
portWriter.write(new Uint8Array([EOF]));
}
const { value, done } = await portReader.read();
if (value[0] == ACK) {
if (!size) {
console.log("XYMini: End of transmission");
return;
}
blockId++;
size -= payloadSize;
i += payloadSize;
nakN = 0;
wrongCharN = 0;
progressCallback(data.length - size);
} else if (value[0] == NAK) {
if (nakN >= 10) {
throw new Error("Received 10 NAK, receiver is rejecting file transmission");
}
console.log("XYMini: NAK");
nakN++;
} else {
if (wrongCharN >= 30) {
throw new Error("Received 30 wrong characters, the receiver is rejecting the transmission or the connection is too noisy");
}
console.log("XYMini: wrong character");
console.log(value);
wrongCharN++;
}
}
}
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