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cores/gpio/GPIOIRQ: Add mode CSR (Edge or Change) and rename polarity CSR to edge. 

Allow interrupts on Change, Rising Edge or Falling Edge.
This commit is contained in:
Florent Kermarrec 2021-03-20 21:49:12 +01:00
parent c2f65b2b04
commit 9113c1a2f9
1 changed files with 13 additions and 2 deletions
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15
litex/soc/cores/gpio.py
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@ -20,14 +20,25 @@ def _to_signal(obj):
class _GPIOIRQ:
def add_irq(self, in_pads):
self._polarity = CSRStorage(len(in_pads), description="GPIO IRQ Polarity: 0: Rising Edge, 1: Falling Edge.")
self._mode = CSRStorage(len(in_pads), description="GPIO IRQ Mode: 0: Edge, 1: Change.")
self._edge = CSRStorage(len(in_pads), description="GPIO IRQ Edge (when in Edge mode): 0: Rising Edge, 1: Falling Edge.")
# # #
self.submodules.ev = EventManager()
for n in range(len(in_pads)):
in_pads_n_d = Signal()
self.sync += in_pads_n_d.eq(in_pads[n])
esp = EventSourceProcess(name=f"i{n}", edge="rising")
self.comb += esp.trigger.eq(in_pads[n] ^ self._polarity.storage[n])
self.comb += [
# Change mode.
If(self._mode.storage[n],
esp.trigger.eq(in_pads[n] ^ in_pads_n_d)
# Edge mode.
).Else(
esp.trigger.eq(in_pads[n] ^ self._edge.storage[n])
)
]
setattr(self.ev, f"i{n}", esp)
# GPIO Input ---------------------------------------------------------------------------------------