diff options
Diffstat (limited to 'nmigen_boards/dev/uart.py')
| -rw-r--r-- | nmigen_boards/dev/uart.py | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/nmigen_boards/dev/uart.py b/nmigen_boards/dev/uart.py index 27d1c81..df03bd1 100644 --- a/nmigen_boards/dev/uart.py +++ b/nmigen_boards/dev/uart.py @@ -1,7 +1,7 @@ from nmigen.build import * -__all__ = ["UARTResource"] +__all__ = ["UARTResource", "IrDAResource"] def UARTResource(number, *, rx, tx, rts=None, cts=None, dtr=None, dsr=None, dcd=None, ri=None, @@ -24,3 +24,19 @@ def UARTResource(number, *, rx, tx, rts=None, cts=None, dtr=None, dsr=None, dcd= if attrs is not None: io.append(attrs) return Resource("uart", number, *io) + + +def IrDAResource(number, *, rx, tx, en=None, sd=None, attrs=None): + # Exactly one of en (active-high enable) or sd (shutdown, active-low enable) should + # be specified, and it is mapped to a logic level en subsignal. + assert (en is not None) ^ (sd is not None) + io = [] + io.append(Subsignal("rx", Pins(rx, dir="i"))) + io.append(Subsignal("tx", Pins(rx, dir="o"))) + if en is not None: + io.append(Subsignal("en", Pins(en, dir="o"))) + if sd is not None: + io.append(Subsignal("en", PinsN(sd, dir="o"))) + if attrs is not None: + io.append(attrs) + return Resource("irda", number, *io) |