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