From 6b24cd713c4d8e513ba21ce42eebed39fe1cf180 Mon Sep 17 00:00:00 2001
From: sasha80 <sasha@mail.ru>
Date: Fri, 29 Aug 2025 10:10:53 +0300
Subject: [PATCH] =?UTF-8?q?=D0=94=D0=BE=D1=80=D0=B0=D0=B1=D0=BE=D1=82?=
 =?UTF-8?q?=D0=BA=D0=B0.=20=D0=9A=D0=BE=D0=BD=D1=82=D1=80=D0=BE=D0=BB?=
 =?UTF-8?q?=D1=8C=D0=BD=D0=B0=D1=8F=20=D1=81=D1=83=D0=BC=D0=BC=D0=B0=20?=
 =?UTF-8?q?=D0=B4=D0=BB=D1=8F=20=D0=A1=D0=9F=D0=A2-25?=
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---
 scripts/network.gd | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/scripts/network.gd b/scripts/network.gd
index 3a73b13a..3104223f 100644
--- a/scripts/network.gd
+++ b/scripts/network.gd
@@ -21,6 +21,31 @@ class Spt25Serial extends SerialPort:
 
     func _to_string() -> String: return 'последовательный порт \"%s\" @ %d (%s)' % [self.port, self.baudrate, 'открыт' if is_open() else 'закрыт']
 
+    func get_check_sum(src: PackedByteArray) -> int:
+        var P_DIV: = 0xF0B8
+        var FCS = ~((src[2]<<8) + src[1])
+        for i in range(3, src.size()):
+            var C = src[i]
+            for j in 8:
+                if C & 1:
+                    if FCS & 1:
+                        FCS = ((FCS >> 1) | 0x8000) ^ P_DIV
+                    else:
+                        FCS = ((FCS >> 1) | 0x8000)
+                else:
+                    if FCS & 1:
+                        FCS = (FCS >> 1) ^ P_DIV
+                    else:
+                        FCS = FCS >> 1
+                C >>= 1
+            for j in 16:
+                if FCS & 1:
+                    FCS = (FCS >> 1) ^ P_DIV
+                else:
+                    FCS = FCS >> 1
+        return ~FCS
+
+
     func try_open(parsing_proc: Callable):
         if is_open():
             return Error.OK