mirror of https://github.com/joan2937/pigpio
166 lines
4.4 KiB
Python
Executable File
166 lines
4.4 KiB
Python
Executable File
#!/usr/bin/env python
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import pigpio
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class hasher:
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"""
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This class forms a hash over the IR pulses generated by an
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IR remote.
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The remote key press is not converted into a code in the manner of
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the lirc module. No attempt is made to decode the type of protocol
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used by the remote. The hash is likely to be unique for different
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keys and different remotes but this is not guaranteed.
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This hashing process works for some remotes/protocols but not for
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others. The only way to find out if it works for one or more of
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your remotes is to try it and see.
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EXAMPLE CODE
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#!/usr/bin/env python
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import time
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import pigpio
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import ir_hasher
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def callback(hash):
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print("hash={}".format(hash));
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pi = pigpio.pi()
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ir = ir_hasher.hasher(pi, 7, callback, 5)
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print("ctrl c to exit");
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time.sleep(300)
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pi.stop()
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"""
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def __init__(self, pi, gpio, callback, timeout=5):
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"""
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Initialises an IR remote hasher on a pi's gpio. A gap of timeout
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milliseconds indicates the end of the remote key press.
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"""
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self.pi = pi
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self.gpio = gpio
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self.code_timeout = timeout
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self.callback = callback
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self.in_code = False
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pi.set_mode(gpio, pigpio.INPUT)
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self.cb = pi.callback(gpio, pigpio.EITHER_EDGE, self._cb)
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def _hash(self, old_val, new_val):
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if new_val < (old_val * 0.60):
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val = 13
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elif old_val < (new_val * 0.60):
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val = 23
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else:
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val = 2
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self.hash_val = self.hash_val ^ val
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self.hash_val *= 16777619 # FNV_PRIME_32
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self.hash_val = self.hash_val & ((1<<32)-1)
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def _cb(self, gpio, level, tick):
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if level != pigpio.TIMEOUT:
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if self.in_code == False:
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self.in_code = True
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self.pi.set_watchdog(self.gpio, self.code_timeout)
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self.hash_val = 2166136261 # FNV_BASIS_32
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self.edges = 1
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self.t1 = None
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self.t2 = None
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self.t3 = None
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self.t4 = tick
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else:
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self.edges += 1
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self.t1 = self.t2
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self.t2 = self.t3
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self.t3 = self.t4
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self.t4 = tick
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if self.t1 is not None:
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d1 = pigpio.tickDiff(self.t1,self.t2)
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d2 = pigpio.tickDiff(self.t3,self.t4)
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self._hash(d1, d2)
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else:
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if self.in_code:
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self.in_code = False
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self.pi.set_watchdog(self.gpio, 0)
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if self.edges > 12:
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self.callback(self.hash_val)
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if __name__ == "__main__":
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import time
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import pigpio
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import ir_hasher
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hashes = {
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142650387: '2', 244341844: 'menu', 262513468: 'vol-',
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272048826: '5', 345069212: '6', 363685443: 'prev.ch',
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434191356: '1', 492745084: 'OK', 549497027: 'mute',
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603729091: 'text', 646476378: 'chan-', 832916949: 'home',
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923778138: 'power', 938165610: 'power', 953243510: 'forward',
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1009731980:'1', 1018231875:'TV', 1142888517:'c-up',
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1151589683:'chan+', 1344018636:'OK', 1348032067:'chan+',
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1367109971:'prev.ch', 1370712102:'c-left', 1438405361:'rewind',
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1452589043:'pause', 1518578730:'chan-', 1554432645:'8',
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1583569525:'0', 1629745313:'rewind', 1666513749:'record',
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1677653754:'c-down', 1825951717:'c-right', 1852412236:'6',
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1894279468:'9', 1904895749:'vol+', 1941947509:'ff',
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2076573637:'0', 2104823531:'back', 2141641957:'home',
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2160787557:'record', 2398525299:'7', 2468117013:'8',
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2476712746:'play', 2574308838:'forward', 2577952149:'4',
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2706654902:'stop', 2829002741:'c-up', 2956097083:'back',
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3112717386:'5', 3263244773:'ff', 3286088195:'pause',
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3363767978:'c-down', 3468076364:'vol-', 3491068358:'stop',
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3593710134:'c-left', 3708232515:'3', 3734134565:'back',
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3766109107:'TV', 3798010010:'play', 3869937700:'menu',
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3872715523:'7', 3885097091:'2', 3895301587:'text',
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3931058739:'mute', 3983900853:'c-right', 4032250885:'4',
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4041913909:'vol+', 4207017660:'9', 4227138677:'back',
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4294027955:'3'}
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def callback(hash):
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if hash in hashes:
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print("key={} hash={}".format(hashes[hash], hash));
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pi = pigpio.pi()
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ir = ir_hasher.hasher(pi, 7, callback, 5)
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print("ctrl c to exit");
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time.sleep(300)
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pi.stop()
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