X-Git-Url: https://vault307.fbx.one/gitweb/micorpython_ir.git/blobdiff_plain/d8d6758c3370f4adc636aed7b935a492754f6062..refs/heads/master:/ir_tx/nec.py

diff --git a/ir_tx/nec.py b/ir_tx/nec.py
index 1e02c9f..be9ee28 100644
--- a/ir_tx/nec.py
+++ b/ir_tx/nec.py
@@ -2,8 +2,9 @@
 # NEC protocol.
 
 # Author: Peter Hinch
-# Copyright Peter Hinch 2020 Released under the MIT license
+# Copyright Peter Hinch 2020-2022 Released under the MIT license
 
+# With thanks to J.E. Tannenbaum for information re Samsung protocol
 from micropython import const
 from ir_tx import IR, STOP
 
@@ -11,17 +12,25 @@ _TBURST = const(563)
 _T_ONE = const(1687)
 
 class NEC(IR):
+    valid = (0xffff, 0xff, 0)  # Max addr, data, toggle
+    samsung = False
 
-    def __init__(self, pin, freq=38000, verbose=False):  # NEC specifies 38KHz
-        super().__init__(pin, freq, 68, 50, verbose)
+    def __init__(self, pin, freq=38000, verbose=False):  # NEC specifies 38KHz also Samsung
+        super().__init__(pin, freq, 68, 33, verbose)  # Measured duty ratio 33%
 
     def _bit(self, b):
         self.append(_TBURST, _T_ONE if b else _TBURST)
 
     def tx(self, addr, data, _):  # Ignore toggle
-        self.append(9000, 4500)
+        if self.samsung:
+            self.append(4500, 4500)
+        else:
+            self.append(9000, 4500)
         if addr < 256:  # Short address: append complement
-            addr |= ((addr ^ 0xff) << 8)
+            if self.samsung:
+              addr |= addr << 8
+            else:
+              addr |= ((addr ^ 0xff) << 8)
         for _ in range(16):
             self._bit(addr & 1)
             addr >>= 1