Add MCE. Fix bug with RC5X.

[micorpython_ir.git] / ir_tx / mce.py

diff --git a/ir_tx/mce.py b/ir_tx/mce.py
new file mode 100644 (file)
index 0000000..24f1aef
--- /dev/null
+++ b/ir_tx/mce.py
@@ -0,0 +1,43 @@
+# mce.py Encoder for IR remote control using synchronous code
+# Supports Microsoft MCE edition remote protocol.
+
+# Author: Peter Hinch
+# Copyright Peter Hinch 2020 Released under the MIT license
+
+# WARNING: This is experimental and subject to change.
+
+from micropython import const
+from ir_tx import IR
+
+_TBIT = const(500)  # Time (μs) for pulse of carrier
+
+
+class MCE(IR):
+    init_cs = 4  # http://www.hifi-remote.com/johnsfine/DecodeIR.html#OrtekMCE says 3
+
+    def __init__(self, pin, freq=38000, verbose=False):
+        super().__init__(pin, freq, 34, 30, verbose)
+
+    def tx(self, addr, data, toggle):
+        def checksum(v):
+            cs = self.init_cs
+            for _ in range(12):
+                if v & 1:
+                    cs += 1
+                v >>= 1
+            return cs
+
+        self.append(2000, 1000, _TBIT)
+        d = ((data & 0x3f) << 6) | (addr & 0xf)  | ((toggle & 3) << 4)
+        d |= checksum(d) << 12
+        self.verbose and print(bin(d))
+
+        mask = 1
+        while mask < 0x10000:
+            bit = bool(d & mask)
+            if bit ^ self.carrier:
+                self.add(_TBIT)
+                self.append(_TBIT)
+            else:
+                self.append(_TBIT, _TBIT)
+            mask <<= 1