====== Checksum des trames de téléinformation enedis ======
===== Documentation Enedis =====
{{ :domotique:enedis_checksum.webp |}}
===== Python =====
<code python>
def checksum(frame):
    somme = 0
    for c in frame[:-1]:
        somme += ord(c)
    somme_trunc = bin(somme)[-6:]
    calc_check = chr(32 + int(somme_trunc, 2))
    if calc_check == frame[-1:]:
        return True
    else:
        return False
</code>
===== JavaScript =====
<code javascript>
function checksum(frame) {
    let somme = 0;
    for (let i = 0; i < frame.length - 1; i++) {
        somme += frame.charCodeAt(i);
    }
    const sommeTrunc = (somme & 0b111111).toString(2);
    const calcCheck = String.fromCharCode(32 + parseInt(sommeTrunc, 2));
    if (calcCheck === frame.slice(-1)) {
        return true;
    } else {
        return false;
    }
}
</code>