ir_tx/philips.py

   1 # philips.py Encoder for IR remote control using synchronous code
   2 # RC-5 and RC-6 mode 0 protocols.
   3
   4 # Author: Peter Hinch
   5 # Copyright Peter Hinch 2020 Released under the MIT license
   6
   7 from micropython import const
   8 from ir_tx import IR
   9
  10 # Philips RC5 protocol
  11 _T_RC5 = const(889)  # Time for pulse of carrier
  12
  13
  14 class RC5(IR):
  15     valid = (0x1f, 0x3f, 1)  # Max addr, data, toggle
  16
  17     def __init__(self, pin, freq=36000, verbose=False):
  18         super().__init__(pin, freq, 28, 30, verbose)
  19
  20     def tx(self, addr, data, toggle):  # Fix RC5X S2 bit polarity
  21         d = (data & 0x3f) | ((addr & 0x1f) << 6) | (((data & 0x40) ^ 0x40) << 6) | ((toggle & 1) << 11)
  22         self.verbose and print(bin(d))
  23         mask = 0x2000
  24         while mask:
  25             if mask == 0x2000:
  26                 self.append(_T_RC5)
  27             else:
  28                 bit = bool(d & mask)
  29                 if bit ^ self.carrier:
  30                     self.add(_T_RC5)
  31                     self.append(_T_RC5)
  32                 else:
  33                     self.append(_T_RC5, _T_RC5)
  34             mask >>= 1
  35
  36 # Philips RC6 mode 0 protocol
  37 _T_RC6 = const(444)
  38 _T2_RC6 = const(889)
  39
  40 class RC6_M0(IR):
  41     valid = (0xff, 0xff, 1)  # Max addr, data, toggle
  42
  43     def __init__(self, pin, freq=36000, verbose=False):
  44         super().__init__(pin, freq, 44, 30, verbose)
  45
  46     def tx(self, addr, data, toggle):
  47         # leader, 1, 0, 0, 0
  48         self.append(2666, _T2_RC6, _T_RC6, _T2_RC6, _T_RC6, _T_RC6, _T_RC6, _T_RC6, _T_RC6)
  49         # Append a single bit of twice duration
  50         if toggle:
  51             self.add(_T2_RC6)
  52             self.append(_T2_RC6)
  53         else:
  54             self.append(_T2_RC6, _T2_RC6)
  55         d = (data & 0xff) | ((addr & 0xff) << 8)
  56         mask = 0x8000
  57         self.verbose and print('toggle', toggle, self.carrier, bool(d & mask))
  58         while mask:
  59             bit = bool(d & mask)
  60             if bit ^ self.carrier:
  61                 self.append(_T_RC6, _T_RC6)
  62             else:
  63                 self.add(_T_RC6)
  64                 self.append(_T_RC6)
  65             mask >>= 1