X-Git-Url: https://vault307.fbx.one/gitweb/micorpython_ir.git/blobdiff_plain/22acf8e1d02787907c7eacba1756b5acd1c4495f..36140aa568d4a538adafb03e575b26de8a0784ef:/ir_tx/nec.py

diff --git a/ir_tx/nec.py b/ir_tx/nec.py
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+++ b/ir_tx/nec.py
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+# nec.py Encoder for IR remote control using synchronous code
+# NEC protocol.
+
+# Author: Peter Hinch
+# Copyright Peter Hinch 2020 Released under the MIT license
+
+from micropython import const
+from ir_tx import IR, STOP
+
+_TBURST = const(563)
+_T_ONE = const(1687)
+
+class NEC(IR):
+
+    def __init__(self, pin, freq=38000, verbose=False):  # NEC specifies 38KHz
+        super().__init__(pin, freq, 68, 50, verbose)
+
+    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 addr < 256:  # Short address: append complement
+            addr |= ((addr ^ 0xff) << 8)
+        for _ in range(16):
+            self._bit(addr & 1)
+            addr >>= 1
+        data |= ((data ^ 0xff) << 8)
+        for _ in range(16):
+            self._bit(data & 1)
+            data >>= 1
+        self.append(_TBURST)
+
+    def repeat(self):
+        self.aptr = 0
+        self.append(9000, 2250, _TBURST, STOP)
+        self.aptr = 0  # Reset pointer
+        self.cb(self._tim)  # Initiate physical transmission.