Need help in correcting issues in CRC-ITU check method written in Javascript (node.js)

Question

We are trying to code GPS device listener on Javascript.

While doing this, we are unable to develop the right script for the CRC-ITU error check. The explanation for

Answer 1

There are some crc packages on npm, but they may not work for you, I create a new one that is just a copy of c code from your link to document.

Install crc-itu from terminal:

npm install crc-itu

app.js

var crc16 = require('crc-itu').crc16;

var crcInHex = crc16('0d0103588990501766460026', 'hex').toString(16);
console.log(crcInHex); // will print 7bf9

you can also try with these values, note: crc16(data).toString(16) => crc

start          data              crc   end
-------------------------------------------
7878   0d0103588990501766460026  7bf9  0d0a
7878   0d010358899050176646002a  b195  0d0a
7878   0d010358899050176646002b  a01c  0d0a