examples/basic/gpio.py

   1 from nmigen import *
   2 from nmigen.cli import main
   3
   4
   5 class GPIO(Elaboratable):
   6     def __init__(self, pins, bus):
   7         self.pins = pins
   8         self.bus  = bus
   9
  10     def elaborate(self, platform):
  11         m = Module()
  12         m.d.comb += self.bus.r_data.eq(self.pins[self.bus.addr])
  13         with m.If(self.bus.we):
  14             m.d.sync += self.pins[self.bus.addr].eq(self.bus.w_data)
  15         return m
  16
  17
  18 if __name__ == "__main__":
  19     bus = Record([
  20         ("addr",   3),
  21         ("r_data", 1),
  22         ("w_data", 1),
  23         ("we",     1),
  24     ])
  25     pins = Signal(8)
  26     gpio = GPIO(Array(pins), bus)
  27     main(gpio, ports=[pins, bus.addr, bus.r_data, bus.w_data, bus.we])