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mirny: allow set attenuation with dB

This commit is contained in:
occheung 2022-02-07 13:31:47 +08:00 committed by Sébastien Bourdeauducq
parent 798a412c6f
commit a74196aa27
2 changed files with 40 additions and 1 deletions

View File

@ -102,6 +102,18 @@ class ADF5356:
else:
self.sync()
@kernel
def set_att(self, att):
"""Set digital step attenuator in SI units.
This method will write the attenuator settings of the channel.
.. seealso:: :meth:`artiq.coredevice.mirny.Mirny.set_att`
:param att: Attenuation in dB.
"""
self.cpld.set_att(self.channel, att)
@kernel
def set_att_mu(self, att):
"""Set digital step attenuator in machine units.

View File

@ -1,7 +1,7 @@
"""RTIO driver for Mirny (4 channel GHz PLLs)
"""
from artiq.language.core import kernel, delay
from artiq.language.core import kernel, delay, portable
from artiq.language.units import us
from numpy import int32
@ -132,6 +132,18 @@ class Mirny:
self.write_reg(1, (self.clk_sel << 4))
delay(1000 * us)
@portable(flags={"fast-math"})
def att_to_mu(self, att):
"""Convert an attenuation setting in dB to machine units.
:param att: Attenuation setting in dB.
:return: Digital attenuation setting.
"""
code = int32(255) - int32(round(att * 8))
if code < 0 or code > 255:
raise ValueError("Invalid Mirny attenuation!")
return code
@kernel
def set_att_mu(self, channel, att):
"""Set digital step attenuator in machine units.
@ -141,6 +153,21 @@ class Mirny:
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 16, SPIT_WR, SPI_CS)
self.bus.write(((channel | 8) << 25) | (att << 16))
@kernel
def set_att(self, channel, att):
"""Set digital step attenuator in SI units.
This method will write the attenuator settings of the selected channel.
.. seealso:: :meth:`set_att_mu`
:param channel: Attenuator channel (0-3).
:param att: Attenuation setting in dB. Higher value is more
attenuation. Minimum attenuation is 0*dB, maximum attenuation is
31.5*dB.
"""
self.set_att_mu(channel, self.att_to_mu(att))
@kernel
def write_ext(self, addr, length, data, ext_div=SPIT_WR):
"""Perform SPI write to a prefixed address"""