def __init__(self, inwidth):
wlog = int(log(inwidth, 2))
self.inputs = Array()
for i in range(inwidth):
self.inputs.append(Signal(1, name_override="input_{}".format(i)))
self.output = Signal(name_override="output")
self.selector = Signal(max=inwidth + 1)
self.io = set(self.inputs) | set([self.output, self.selector])
sel_r = Signal(max=inwidth + 1)
sel25 = Signal(max=1 << inwidth)
zero = Constant(0)
muxes = []
for i in range(len(self.inputs)):
x = Constant(1 << i, inwidth)
choose = Signal()
choose.eq(self.selector & x)
muxes.append(Mux(self.selector & x, self.inputs[i], zero))
mux = self.output.eq(reduce(orop, muxes))
self.comb += mux
self.sync += sel_r.eq(self.selector)
d = {}
x = 1
for i in range(inwidth):
d[i] = (sel25.eq(x << i), )
self.sync += If(
self.selector != sel_r,
sel25.eq(0),
).Else(Case(sel_r, d))
class Blinker(Module):
def __init__(self, led, maxperiod1, maxperiod2, select):
self.counter = Signal(max=maxperiod1 + 1)
self.period1 = Signal(max=maxperiod1 + 1)
self.period2 = Signal(max=maxperiod2 + 1)
self.selector = Signal(max=select + 1)
self.period = Signal(max=maxperiod1 + 1)
self.comb += self.period.eq(
Mux(self.selector, self.period1, self.period2))
self.comb += self.period1.eq(maxperiod1)
self.comb += self.period2.eq(maxperiod2)
self.sync += If(self.counter == 0, led.eq(~led),
self.counter.eq(self.period)).Else(
self.counter.eq(self.counter - 1))
self.led = led
class LoopbackTop(Module):
def __init__(self, clk_freq, baud_rate):
self.submodules.uart = uart.Core(clk_freq, baud_rate)
self.rx_led = Signal()
self.tx_led = Signal()
self.load_led = Signal()
self.take_led = Signal()
self.empty_led = Signal()
self.comb += [self.tx_led.eq(~self.uart.tx),
self.rx_led.eq(~self.uart.rx),
self.load_led.eq(self.uart.sout.load),
self.take_led.eq(self.uart.sin.take),
self.empty_led.eq(self.uart.sin.empty)]
self.comb += [self.uart.out_data.eq(self.uart.in_data)]
self.sync += [
self.uart.wr.eq(0),
self.uart.rd.eq(0),
If(~self.uart.sin.empty,
self.uart.wr.eq(1),
self.uart.rd.eq(1)
)
]