X-Git-Url: https://robinkrens.nl/gitweb/?a=blobdiff_plain;f=src%2FRAPacker.py;h=676a296e4a26cdaae482851b992c580f9d63b7e4;hb=ea527f1f036f5f313d0c395a9e24ae365c22f451;hp=8480267299d6759d7512455f946124fd0dfc6d0e;hpb=f20539bf17d3de8e0ab56d834f665eeea4813988;p=renesas-ra-flasher

diff --git a/src/RAPacker.py b/src/RAPacker.py
index 8480267..676a296 100644
--- a/src/RAPacker.py
+++ b/src/RAPacker.py
@@ -63,7 +63,7 @@ TESTID = [
 
 def calc_sum(cmd, data):
     data_len = len(data)
-    lnh = data_len + 1 & 0xFF00
+    lnh = (data_len + 1 & 0xFF00) >> 8
     lnl = data_len + 1 & 0x00FF
     res = lnh + lnl + cmd
     for i in range(data_len):
@@ -98,8 +98,8 @@ def pack_command(cmd, data):
 
 # format of data packet is [SOD|LNH|LNL|RES|DAT|SUM|ETX]
 def pack_pkt(res, data):
-    SOD = 0x81
-    if (len(data) >= 1024):
+    SOD = 0x01 # TODO: check if 0x81 header needed
+    if (len(data) > 1024):
         raise Exception(f'Data packet too large, data length is {DATA_LEN} (>1024)')
     LNH, LNL, SUM = calc_sum(int(res), data)
     if not isinstance(data, bytes):