artiq/artiq/coredevice/ttl.py

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from artiq.language.core import *
from artiq.language.db import *
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class LLTTLOut(AutoDB):
"""Low-level RTIO TTL output driver.
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Allows setting RTIO TTL outputs at arbitrary times, without time
unit conversion.
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This is meant to be used mostly in drivers; consider using
``TTLOut`` instead.
This should be used with output-only channels.
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"""
class DBKeys:
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core = Device()
channel = Argument()
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@kernel
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def set_o(self, t, value):
"""Sets the output value of the RTIO channel.
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:param t: timestamp in RTIO cycles (64-bit integer).
:param value: value to set at the output.
"""
syscall("ttl_set_o", t, self.channel, value)
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@kernel
def on(self, t):
"""Turns the RTIO channel on.
:param t: timestamp in RTIO cycles (64-bit integer).
"""
self.set_o(t, True)
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@kernel
def off(self, t):
"""Turns the RTIO channel off.
:param t: timestamp in RTIO cycles (64-bit integer).
"""
self.set_o(t, False)
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class TTLOut(AutoDB):
"""RTIO TTL output driver.
This should be used with output-only channels.
:param core: core device
:param channel: channel number
"""
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class DBKeys:
core = Device()
channel = Argument()
def build(self):
# in RTIO cycles
self.o_previous_timestamp = int64(0)
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@kernel
def _set_o(self, o):
syscall("ttl_set_o", time_to_cycles(now()), self.channel, o)
self.o_previous_timestamp = time_to_cycles(now())
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@kernel
def sync(self):
"""Busy-waits until all programmed level switches have been effected."""
while syscall("rtio_get_counter") < self.o_previous_timestamp:
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pass
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@kernel
def on(self):
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"""Sets the output to a logic high state."""
self._set_o(True)
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@kernel
def off(self):
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"""Sets the output to a logic low state."""
self._set_o(False)
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@kernel
def pulse(self, duration):
"""Pulses the output high for the specified duration."""
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self.on()
delay(duration)
self.off()
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class TTLInOut(AutoDB):
"""RTIO TTL input/output driver.
In output mode, provides functions to set the logic level on the signal.
In input mode, provides functions to analyze the incoming signal, with
real-time gating to prevent overflows.
RTIO TTLs supports zero-length transition suppression. For example, if
two pulses are emitted back-to-back with no delay between them, they will
be merged into a single pulse with a duration equal to the sum of the
durations of the original pulses.
This should be used with bidirectional channels.
:param core: core device
:param channel: channel number
"""
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class DBKeys:
core = Device()
channel = Argument()
def build(self):
# in RTIO cycles
self.o_previous_timestamp = int64(0)
self.i_previous_timestamp = int64(0)
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@kernel
def _set_oe(self, oe):
syscall("ttl_set_oe", time_to_cycles(now()), self.channel, oe)
@kernel
def output(self):
self._set_oe(True)
@kernel
def input(self):
self._set_oe(False)
@kernel
def _set_o(self, o):
syscall("ttl_set_o", time_to_cycles(now()), self.channel, o)
self.o_previous_timestamp = time_to_cycles(now())
@kernel
def sync(self):
"""Busy-waits until all programmed level switches have been effected."""
while syscall("rtio_get_counter") < self.o_previous_timestamp:
pass
@kernel
def on(self):
"""Sets the output to a logic high state."""
self._set_o(True)
@kernel
def off(self):
"""Sets the output to a logic low state."""
self._set_o(False)
@kernel
def pulse(self, duration):
"""Pulses the output high for the specified duration."""
self.on()
delay(duration)
self.off()
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@kernel
def _set_sensitivity(self, value):
syscall("ttl_set_sensitivity", time_to_cycles(now()), self.channel, value)
self.i_previous_timestamp = time_to_cycles(now())
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@kernel
def gate_rising(self, duration):
"""Register rising edge events for the specified duration."""
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self._set_sensitivity(1)
delay(duration)
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self._set_sensitivity(0)
@kernel
def gate_falling(self, duration):
"""Register falling edge events for the specified duration."""
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self._set_sensitivity(2)
delay(duration)
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self._set_sensitivity(0)
@kernel
def gate_both(self, duration):
"""Register both rising and falling edge events for the specified
duration."""
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self._set_sensitivity(3)
delay(duration)
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self._set_sensitivity(0)
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@kernel
def count(self):
"""Poll the RTIO input during all the previously programmed gate
openings, and returns the number of registered events."""
count = 0
while syscall("ttl_get", self.channel,
self.i_previous_timestamp) >= 0:
count += 1
return count
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@kernel
def timestamp(self):
"""Poll the RTIO input and returns an event timestamp, according to
the gating.
If the gate is permanently closed, returns a negative value.
"""
return cycles_to_time(syscall("ttl_get", self.channel,
self.i_previous_timestamp))