misoclib/com/gpio.py

   1 from migen.fhdl.std import *
   2 from migen.genlib.cdc import MultiReg
   3 from migen.bank.description import *
   4
   5
   6 class GPIOIn(Module, AutoCSR):
   7     def __init__(self, signal):
   8         self._in = CSRStatus(flen(signal))
   9         self.specials += MultiReg(signal, self._in.status)
  10
  11
  12 class GPIOOut(Module, AutoCSR):
  13     def __init__(self, signal):
  14         self._out = CSRStorage(flen(signal))
  15         self.comb += signal.eq(self._out.storage)
  16
  17
  18 class GPIOInOut(Module):
  19     def __init__(self, in_signal, out_signal):
  20         self.submodules.gpio_in = GPIOIn(in_signal)
  21         self.submodules.gpio_out = GPIOOut(out_signal)
  22
  23     def get_csrs(self):
  24         return self.gpio_in.get_csrs() + self.gpio_out.get_csrs()
  25
  26
  27 class Blinker(Module):
  28     def __init__(self, signal, divbits=26):
  29         counter = Signal(divbits)
  30         self.comb += signal.eq(counter[divbits-1])
  31         self.sync += counter.eq(counter + 1)