forked from M-Labs/artiq
1
0
Fork 0

devices/rtio_core: add LLRTIOOut

This commit is contained in:
Sebastien Bourdeauducq 2014-10-17 00:12:53 +08:00
parent 3c49d7448d
commit 111bd3092c
1 changed files with 53 additions and 0 deletions

View File

@ -2,6 +2,59 @@ from artiq.language.core import *
from artiq.devices.runtime_exceptions import RTIOSequenceError
class LLRTIOOut(AutoContext):
"""Low-level RTIO output driver.
Allows setting RTIO outputs at arbitrary times, without time unit
conversion and without zero-length transition suppression.
This is meant to be used mostly in drivers; consider using
``RTIOOut`` instead.
"""
parameters = "channel"
def build(self):
self.previous_timestamp = int64(0) # in RTIO cycles
self._set_oe()
kernel_attr = "previous_timestamp"
@kernel
def _set_oe(self):
syscall("rtio_oe", self.channel, 1)
@kernel
def set_value(self, t, value):
"""Sets the value of the RTIO channel.
:param t: timestamp in RTIO cycles (64-bit integer).
:param value: value to set at the output.
"""
if t <= self.previous_timestamp:
raise RTIOSequenceError
syscall("rtio_set", t, self.channel, value)
self.previous_timestamp = t
@kernel
def on(self, t):
"""Turns the RTIO channel on.
:param t: timestamp in RTIO cycles (64-bit integer).
"""
self.set_value(t, 1)
@kernel
def off(self, t):
"""Turns the RTIO channel off.
:param t: timestamp in RTIO cycles (64-bit integer).
"""
self.set_value(t, 0)
class _RTIOBase(AutoContext):
parameters = "channel"