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 sys import platform
   9 ESP32 = platform == 'esp32' or platform == 'esp32_LoBo'
  10 from ir_tx import IR
  11
  12 # Philips RC5 protocol
  13 _T_RC5 = const(889)  # Time for pulse of carrier
  14 ermsg = 'ESP32 does not support Philips protocols'
  15 class RC5(IR):
  16
  17     def __init__(self, pin, freq=36000, verbose=False):
  18         if ESP32:
  19             raise RuntimeError(ermsg)
  20         super().__init__(pin, freq, 28, 30, verbose)
  21
  22     def tx(self, addr, data, toggle):
  23         d = (data & 0x3f) | ((addr & 0x1f) << 6) | ((data & 0x40) << 6) | ((toggle & 1) << 11)
  24         self.verbose and print(bin(d))
  25         mask = 0x2000
  26         while mask:
  27             if mask == 0x2000:
  28                 self.append(_T_RC5)
  29             else:
  30                 bit = bool(d & mask)
  31                 if bit ^ self.carrier:
  32                     self.add(_T_RC5)
  33                     self.append(_T_RC5)
  34                 else:
  35                     self.append(_T_RC5, _T_RC5)
  36             mask >>= 1
  37
  38 # Philips RC6 mode 0 protocol
  39 _T_RC6 = const(444)
  40 _T2_RC6 = const(889)
  41
  42 class RC6_M0(IR):
  43
  44     def __init__(self, pin, freq=36000, verbose=False):
  45         if ESP32:
  46             raise RuntimeError(ermsg)
  47         super().__init__(pin, freq, 44, 30, verbose)
  48
  49     def tx(self, addr, data, toggle):
  50         # leader, 1, 0, 0, 0
  51         self.append(2666, _T2_RC6, _T_RC6, _T2_RC6, _T_RC6, _T_RC6, _T_RC6, _T_RC6, _T_RC6)
  52         # Append a single bit of twice duration
  53         if toggle:
  54             self.add(_T2_RC6)
  55             self.append(_T2_RC6)
  56         else:
  57             self.append(_T2_RC6, _T2_RC6)
  58         d = (data & 0xff) | ((addr & 0xff) << 8)
  59         mask = 0x8000
  60         self.verbose and print('toggle', toggle, self.carrier, bool(d & mask))
  61         while mask:
  62             bit = bool(d & mask)
  63             if bit ^ self.carrier:
  64                 self.append(_T_RC6, _T_RC6)
  65             else:
  66                 self.add(_T_RC6)
  67                 self.append(_T_RC6)
  68             mask >>= 1