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core/led: simplify LedChaser (to have the same user interface than GPIOOut).

This commit is contained in:
Florent Kermarrec 2020-05-08 22:13:47 +02:00
parent 05869beb72
commit fbbbdf03b5
1 changed files with 11 additions and 12 deletions
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23
litex/soc/cores/led.py
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@ -8,27 +8,26 @@ from litex.soc.interconnect.csr import *
# Led Chaser ---------------------------------------------------------------------------------------
_CHASER_MODE = 0
_CONTROL_MODE = 1
class LedChaser(Module, AutoCSR):
def __init__(self, pads, sys_clk_freq, period=1e0):
self.control = CSRStorage(fields=[
CSRField("mode", size=2, values=[
("``0b0``", "Chaser mode."),
("``0b1``", "CPU mode."),
])
])
self.value = CSRStorage(len(pads), description="Control value when in CPU mode.")
self._out = CSRStorage(len(pads), description="Led Output(s) Control.")
# # #
n = len(pads)
chaser = Signal(n)
timer = WaitTimer(int(period*sys_clk_freq/(2*n)))
n = len(pads)
chaser = Signal(n)
mode = Signal(reset=_CHASER_MODE)
timer = WaitTimer(int(period*sys_clk_freq/(2*n)))
self.submodules += timer
self.comb += timer.wait.eq(~timer.done)
self.sync += If(timer.done, chaser.eq(Cat(~chaser[-1], chaser)))
self.sync += If(self._out.re, mode.eq(_CONTROL_MODE))
self.comb += [
If(self.control.fields.mode,
pads.eq(self.value.storage)
If(mode == _CONTROL_MODE,
pads.eq(self._out.storage)
).Else(
pads.eq(chaser)
)