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suservo: document set_config and get_status more 

close #1028
This commit is contained in:
Robert Jördens 2018-05-31 16:30:40 +00:00
parent e1b0fcc24e
commit 5dbdc5650c
1 changed files with 16 additions and 4 deletions
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20
artiq/coredevice/suservo.py
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@ -130,12 +130,15 @@ class SUServo:
def set_config(self, enable):
"""Set SU Servo configuration.
Disabling takes up to 2 Servo cycles (~2.2 µs) to clear
the processing pipeline.
This method advances the timeline by one Servo memory access.
It does not support RTIO event replacement.
:param enable: Enable Servo operation.
:param enable (int): Enable Servo operation. Enabling starts servo
iterations beginning with the ADC sampling stage. This also
provides a mean for synchronization of Servo updates to other RTIO
activity.
Disabling takes up to 2 Servo cycles (~2.2 µs) to clear the
processing pipeline.
"""
self.write(CONFIG_ADDR, enable)
@ -144,7 +147,16 @@ class SUServo:
"""Get current SU Servo status.
This method does not advance the timeline but consumes all slack.
The ``done`` bit indicates that a SUServo cycle has completed.
It is pulsed for one RTIO cycle every SUServo cycle and asserted
continuously when the servo is not ``enabled`` and the pipeline has
drained (the last DDS update is done).
This method returns and clears the clip indicator for all channels.
An asserted clip indicator corresponds to the servo having encountered
an input signal on an active channel that would have resulted in the
IIR state exceeding the output range.
:return: Status. Bit 0: enabled, bit 1: done,
bits 8-15: channel clip indicators.