'%s' % btn[1]]])
def __init__(self):
+ self.reset()
+
+ def reset(self):
self.state = 'IDLE'
self.ss_bit = self.ss_start = self.ss_other_edge = self.ss_remote = 0
self.data = self.count = self.active = None
self.out_ann = self.register(srd.OUTPUT_ANN)
self.active = 0 if self.options['polarity'] == 'active-low' else 1
- # Set the initial (assumed) value of the pin as per user-config.
- self.initial_pins = [1 if self.active == 0 else 0]
-
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
- self.margin = int(self.samplerate * 0.0001) - 1 # 0.1ms
+ self.tolerance = 0.05 # +/-5%
self.lc = int(self.samplerate * 0.0135) - 1 # 13.5ms
self.rc = int(self.samplerate * 0.01125) - 1 # 11.25ms
self.dazero = int(self.samplerate * 0.001125) - 1 # 1.125ms
self.daone = int(self.samplerate * 0.00225) - 1 # 2.25ms
self.stop = int(self.samplerate * 0.000652) - 1 # 0.652ms
+ def compare_with_tolerance(self, measured, base):
+ return (measured >= base * (1 - self.tolerance)
+ and measured <= base * (1 + self.tolerance))
+
def handle_bit(self, tick):
ret = None
- if tick in range(self.dazero - self.margin, self.dazero + self.margin):
+ if self.compare_with_tolerance(tick, self.dazero):
ret = 0
- elif tick in range(self.daone - self.margin, self.daone + self.margin):
+ elif self.compare_with_tolerance(tick, self.daone):
ret = 1
if ret in (0, 1):
self.putb([0, ['%d' % ret]])
# State machine.
if self.state == 'IDLE':
- if b in range(self.lc - self.margin, self.lc + self.margin):
+ if self.compare_with_tolerance(b, self.lc):
self.putpause('Long')
self.putx([5, ['Leader code', 'Leader', 'LC', 'L']])
self.ss_remote = self.ss_start
self.data = self.count = 0
self.state = 'ADDRESS'
- elif b in range(self.rc - self.margin, self.rc + self.margin):
+ elif self.compare_with_tolerance(b, self.rc):
self.putpause('Short')
self.putstop(self.samplenum)
self.samplenum += self.stop