ir_rx/samsung.py

   1 # samsung.py Decoder for IR remote control using synchronous code
   2 # Supports Samsung TV remote protocols.
   3
   4 # Author: J.E. Tannenbaum
   5 # Copyright J.E.Tannenbaum 2021 Released under the MIT license
   6
   7 from utime import ticks_us, ticks_diff
   8 from ir_rx import IR_RX
   9
  10 class SAMSUNG(IR_RX):
  11     def __init__(self, pin, callback, *args):
  12         super().__init__(pin, 68, 80, callback, *args)
  13
  14     def decode(self, _):
  15         def near(v, target):
  16             return target * 0.8 < v < target * 1.2
  17
  18         lb = self.edge - 1  # Possible length of burst
  19         burst = []
  20         for x in range(lb):
  21             dt = ticks_diff(self._times[x + 1], self._times[x])
  22             if x > 0 and dt > 10000:  # Reached gap between repeats
  23                 break
  24             burst.append(dt)
  25
  26         lb = len(burst)  # Actual length
  27         cmd = 0
  28         if near(burst[0], 4500) and near(burst[1], 4500) and lb == 67:
  29             # Skip the starting bits and the checksum at the end of the sequence
  30             for x in range(2, lb - 1, 2):
  31                 cmd *= 2
  32                 # Test for logical 1 (One byte low, next byte high)
  33                 if burst[x] < 1000 and burst[x + 1] > 1000:
  34                     cmd += 1
  35
  36         # Set up for new data burst and run user callback
  37         self.do_callback(cmd, 0, 0)