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doc: clarify urukul attenuator behavior 

Closes #1386

Signed-off-by: Fabian Schmid <fabian.schmid@mpq.mpg.de>
This commit is contained in:
Fabian Schmid 2019-11-17 16:51:26 +01:00 committed by Robert Jördens
parent f330e285fb
commit f73e2a3d30
3 changed files with 16 additions and 1 deletions
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4
artiq/coredevice/ad9910.py
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@ -684,6 +684,8 @@ class AD9910:
def set_att_mu(self, att): def set_att_mu(self, att):
"""Set digital step attenuator in machine units. """Set digital step attenuator in machine units.
This method will write the attenuator settings of all four channels.
.. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att_mu` .. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att_mu`
:param att: Attenuation setting, 8 bit digital. :param att: Attenuation setting, 8 bit digital.
@ -694,6 +696,8 @@ class AD9910:
def set_att(self, att): def set_att(self, att):
"""Set digital step attenuator in SI units. """Set digital step attenuator in SI units.
This method will write the attenuator settings of all four channels.
.. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att` .. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att`
:param att: Attenuation in dB. :param att: Attenuation in dB.

4
artiq/coredevice/ad9912.py
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@ -113,6 +113,8 @@ class AD9912:
def set_att_mu(self, att): def set_att_mu(self, att):
"""Set digital step attenuator in machine units. """Set digital step attenuator in machine units.
This method will write the attenuator settings of all four channels.
.. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att_mu` .. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att_mu`
:param att: Attenuation setting, 8 bit digital. :param att: Attenuation setting, 8 bit digital.
@ -123,6 +125,8 @@ class AD9912:
def set_att(self, att): def set_att(self, att):
"""Set digital step attenuator in SI units. """Set digital step attenuator in SI units.
This method will write the attenuator settings of all four channels.
.. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att` .. seealso:: :meth:`artiq.coredevice.urukul.CPLD.set_att`
:param att: Attenuation in dB. Higher values mean more attenuation. :param att: Attenuation in dB. Higher values mean more attenuation.

9
artiq/coredevice/urukul.py
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@ -288,7 +288,8 @@ class CPLD:
def set_att_mu(self, channel, att): def set_att_mu(self, channel, att):
"""Set digital step attenuator in machine units. """Set digital step attenuator in machine units.
This method will write the attenuator settings of all four channels. This method will also write the attenuator settings of the three other channels. Use
:meth:`get_att_mu` to retrieve the hardware state set in previous experiments.
:param channel: Attenuator channel (0-3). :param channel: Attenuator channel (0-3).
:param att: Digital attenuation setting: :param att: Digital attenuation setting:
@ -315,6 +316,10 @@ class CPLD:
def set_att(self, channel, att): def set_att(self, channel, att):
"""Set digital step attenuator in SI units. """Set digital step attenuator in SI units.
This method will write the attenuator settings of all four channels.
.. seealso:: :meth:`set_att_mu`
:param channel: Attenuator channel (0-3). :param channel: Attenuator channel (0-3).
:param att: Attenuation setting in dB. Higher value is more :param att: Attenuation setting in dB. Higher value is more
attenuation. Minimum attenuation is 0*dB, maximum attenuation is attenuation. Minimum attenuation is 0*dB, maximum attenuation is
@ -326,6 +331,8 @@ class CPLD:
def get_att_mu(self): def get_att_mu(self):
"""Return the digital step attenuator settings in machine units. """Return the digital step attenuator settings in machine units.
The result is stored and will be used in future calls of :meth:`set_att_mu`.
:return: 32 bit attenuator settings :return: 32 bit attenuator settings
""" """
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_INPUT, 32, self.bus.set_config_mu(SPI_CONFIG | spi.SPI_INPUT, 32,