nmigen/sim/_pyclock.py

   1 import inspect
   2
   3 from ._base import BaseProcess
   4
   5
   6 __all__ = ["PyClockProcess"]
   7
   8
   9 class PyClockProcess(BaseProcess):
  10     def __init__(self, state, signal, *, phase, period):
  11         assert len(signal) == 1
  12
  13         self.state  = state
  14         self.slot   = self.state.get_signal(signal)
  15         self.phase  = phase
  16         self.period = period
  17
  18         self.reset()
  19
  20     def reset(self):
  21         self.runnable = True
  22         self.passive = True
  23
  24         self.initial = True
  25
  26     def run(self):
  27         self.runnable = False
  28
  29         if self.initial:
  30             self.initial = False
  31             self.state.wait_interval(self, self.phase)
  32
  33         else:
  34             clk_state = self.state.slots[self.slot]
  35             clk_state.set(not clk_state.curr)
  36             self.state.wait_interval(self, self.period / 2)