litex/soc/cores/gpio.py

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