Merge pull request #810 from antmicro/gpio_interrupts
Add support for interrupts on GPIOIn
This commit is contained in:
commit
89454d2df3
|
@ -10,19 +10,63 @@ from migen.genlib.cdc import MultiReg
|
|||
|
||||
from litex.soc.interconnect.csr import *
|
||||
|
||||
from litex.soc.interconnect.csr_eventmanager import *
|
||||
|
||||
from enum import Enum
|
||||
|
||||
# Helpers ------------------------------------------------------------------------------------------
|
||||
|
||||
def _to_signal(obj):
|
||||
return obj.raw_bits() if isinstance(obj, Record) else obj
|
||||
|
||||
class IRQ_Type(Enum):
|
||||
NO_IRQ = 0
|
||||
RISING_EDGE = 1
|
||||
FALLING_EDGE = 2
|
||||
|
||||
# GPIO Input ---------------------------------------------------------------------------------------
|
||||
|
||||
class GPIOIn(Module, AutoCSR):
|
||||
def __init__(self, pads):
|
||||
"""GPIO Input
|
||||
|
||||
Parameters / Attributes
|
||||
-----------------------
|
||||
pads : Object
|
||||
GPIO Input pads description.
|
||||
|
||||
irq : list of IRQ_Type (optional)
|
||||
List containing IRQ types for each pad. It can take values supported by IRQ_Type Enum.
|
||||
|
||||
Example use:
|
||||
irq = [IRQ_Type.NO_IRQ, IRQ_Type.NO_IRQ, IRQ_Type.FALLING_EDGE, IRQ_Type.RISING_EDGE]
|
||||
This adds interrupts on pins 2 (falling edge) and 3 (rising edge).
|
||||
"""
|
||||
def __init__(self, pads, irq=None):
|
||||
pads = _to_signal(pads)
|
||||
self._in = CSRStatus(len(pads), description="GPIO Input(s) Status.")
|
||||
self.specials += MultiReg(pads, self._in.status)
|
||||
|
||||
if irq:
|
||||
assert(len(irq) <= len(pads))
|
||||
self.submodules.ev = EventManager()
|
||||
|
||||
irq_no = []
|
||||
for i, irq_type in enumerate(irq):
|
||||
assert(irq_type, IRQ_Type)
|
||||
name = "pin" + str(i)
|
||||
if irq_type == IRQ_Type.RISING_EDGE:
|
||||
setattr(self.ev, name, EventSourcePulse())
|
||||
irq_no.append(i)
|
||||
elif irq_type == IRQ_Type.FALLING_EDGE:
|
||||
setattr(self.ev, name, EventSourceProcess())
|
||||
irq_no.append(i)
|
||||
|
||||
self.ev.finalize()
|
||||
|
||||
sources_u = [v for k, v in xdir(self.ev, True) if isinstance(v, (EventSourcePulse, EventSourceProcess))]
|
||||
for i, source in enumerate(sources_u):
|
||||
self.comb += source.trigger.eq(pads[irq_no[i]])
|
||||
|
||||
# GPIO Output --------------------------------------------------------------------------------------
|
||||
|
||||
class GPIOOut(Module, AutoCSR):
|
||||
|
|
Loading…
Reference in New Issue