- def decode(self, ss, es, data):
-
- for (self.samplenum, pins) in data:
- # Ignore identical samples early on (for performance reasons).
- if self.oldpin == pins[0]:
- continue
-
- # Initialize self.oldpins with the first sample value.
- if self.oldpin is None:
- self.oldpin = pins[0]
- continue
-
- if self.first_transition:
- # First rising edge
- if self.oldpin != self.startedge:
- self.first_samplenum = self.samplenum
- self.start_samplenum = self.samplenum
- self.first_transition = False
+ def decode(self):
+
+ # Get the first rising edge.
+ pin, = self.wait({0: 'e'})
+ if pin != self.startedge:
+ pin, = self.wait({0: 'e'})
+ self.first_samplenum = self.samplenum
+ self.start_samplenum = self.samplenum
+
+ # Handle all next edges.
+ while True:
+ pin, = self.wait({0: 'e'})
+
+ if pin == self.startedge:
+ # Rising edge
+ # We are on a full cycle we can calculate
+ # the period, the duty cycle and its ratio.
+ period = self.samplenum - self.start_samplenum
+ duty = self.end_samplenum - self.start_samplenum
+ ratio = float(duty / period)
+
+ # This interval starts at this edge.
+ self.ss_block = self.start_samplenum
+ # Store the new rising edge position and the ending
+ # edge interval.
+ self.start_samplenum = self.es_block = self.samplenum
+
+ # Report the duty cycle in percent.
+ percent = float(ratio * 100)
+ self.putx([0, ['%f%%' % percent]])
+
+ # Report the duty cycle in the binary output.
+ self.putb([0, bytes([int(ratio * 256)])])
+
+ # Report the period in units of time.
+ period_t = float(period / self.samplerate)
+ self.putp(period_t)
+
+ # Update and report the new duty cycle average.
+ self.num_cycles += 1
+ self.average += percent
+ self.put(self.first_samplenum, self.es_block, self.out_average,
+ float(self.average / self.num_cycles))