From 01e61f5eff19c480bf322a974674dffc7a84c6f9 Mon Sep 17 00:00:00 2001
From: Charlymd <charles.peltierlanne@gmail.com>
Date: Wed, 26 Aug 2020 09:06:42 +0200
Subject: [PATCH] ajout de la fonction de calcul du checksum

---
 teleinfo.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/teleinfo.py b/teleinfo.py
index 87467a7..bb29f5b 100644
--- a/teleinfo.py
+++ b/teleinfo.py
@@ -73,6 +73,16 @@ def add_measures(measures, time_measure):
 
     client.write_points(points)
 
+def calc_checksum(group):
+    # Calcul le caractere de controle d'une ligne de trame linky
+    # seule l'etiquette et la donnée de chaque ligne doivent etre envoyés en parametre group
+    data_unicode = 0
+    for data in group:
+            data_unicode += ord(data)
+    sum_unicode = (data_unicode & 63) + 32
+    sum = chr(sum_unicode)
+    return sum
+
 
 def main():
     with serial.Serial(port='/dev/ttyS0', baudrate=1200, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,