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ttl: Expand input gate/count API docstrings

This commit is contained in:
David Nadlinger 2018-10-26 16:08:08 +01:00 committed by Sébastien Bourdeauducq
parent f02ceee626
commit f79b9d9e1e
1 changed files with 73 additions and 14 deletions
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87
artiq/coredevice/ttl.py
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@ -190,7 +190,8 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(1)
delay_mu(duration)
@ -204,7 +205,8 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(2)
delay_mu(duration)
@ -218,7 +220,8 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(3)
delay_mu(duration)
@ -232,7 +235,8 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(1)
delay(duration)
@ -246,7 +250,9 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(2)
delay(duration)
@ -260,7 +266,8 @@ class TTLInOut:
The time cursor is advanced by the specified duration.
:return: The timeline cursor at the end of the gate window.
:return: The timeline cursor at the end of the gate window, for
convenience when used with :meth:`count`/:meth:`timestamp_mu`.
"""
self._set_sensitivity(3)
delay(duration)
@ -269,10 +276,52 @@ class TTLInOut:
@kernel
def count(self, up_to_timestamp_mu):
"""Poll the RTIO input up to the specified timestamp, and returns the
number of registered events.
"""Consume RTIO input events until the hardware timestamp counter has
reached the specified timestamp and return the number of observed
events.
This function does not interact with the timeline cursor."""
This function does not interact with the timeline cursor.
See the ``gate_*()`` family of methods to select the input transitions
that generate events, and :meth:`timestamp_mu` to obtain the timestamp
of the first event rather than an accumulated count.
:param up_to_timestamp_mu: The timestamp up to which execution is
blocked, that is, up to which input events are guaranteed to be
taken into account. (Events with later timestamps might still be
registered if they are already available.)
:return: The number of events before the timeout elapsed (0 if none
observed).
Examples:
To count events on channel ``ttl_input``, up to the current timeline
position::
ttl_input.count(now_mu())
If other events are scheduled between the end of the input gate
period and when the number of events is counted, using ``now_mu()``
as timeout consumes an unnecessary amount of timeline slack. In
such cases, it can be beneficial to pass a more precise timestamp,
for example::
gate_end_mu = ttl_input.gate_rising(100 * us)
# Schedule a long pulse sequence, represented here by a delay.
delay(10 * ms)
# Get number of rising edges. This will block until the end of
# the gate window, but does not wait for the long pulse sequence
# afterwards, thus (likely) completing with a large amount of
# slack left.
num_rising_edges = ttl_input.count(gate_end_mu)
The ``gate_*()`` family of methods return the cursor at the end
of the window, allowing this to be expressed in a compact fashion::
ttl_input.count(ttl_input.gate_rising(100 * us))
"""
count = 0
while rtio_input_timestamp(up_to_timestamp_mu, self.channel) >= 0:
count += 1
@ -280,13 +329,23 @@ class TTLInOut:
@kernel
def timestamp_mu(self, up_to_timestamp_mu):
"""Poll the RTIO input and returns an event timestamp (in machine
units) according to the selected gates, or -1 if no event occured before
the specified timestamp.
"""Return the timestamp of the next RTIO input event, or -1 if the
hardware timestamp counter reaches the given value before an event is
received.
If the gate is permanently closed, returns a negative value.
This function does not interact with the timeline cursor.
This function does not interact with the timeline cursor."""
See the ``gate_*()`` family of methods to select the input transitions
that generate events, and :meth:`count` for usage examples.
:param up_to_timestamp_mu: The timestamp up to which execution is
blocked, that is, up to which input events are guaranteed to be
taken into account. (Events with later timestamps might still be
registered if they are already available.)
:return: The timestamp (in machine units) of the first event received;
-1 on timeout.
"""
return rtio_input_timestamp(up_to_timestamp_mu, self.channel)
# Input API: sampling