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sawg: add channel reset (closes #751)

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This commit is contained in:
Robert Jördens 2017-06-16 19:31:57 +02:00
parent 2a76034fbc
commit b5772f478a
2 changed files with 48 additions and 2 deletions
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45
artiq/coredevice/sawg.py
View File

@ -1,5 +1,5 @@
from artiq.language.types import TInt32, TFloat
from numpy import int32
from numpy import int32, int64
from artiq.language.core import kernel, now_mu
from artiq.coredevice.spline import Spline
from artiq.coredevice.rtio import rtio_output
@ -26,13 +26,18 @@ class Config:
:param channel: RTIO channel number of the channel.
:param core: Core device.
"""
kernel_invariants = {"channel", "core", "_out_scale", "_duc_scale"}
kernel_invariants = {"channel", "core", "_out_scale", "_duc_scale",
"_rtio_interval"}
def __init__(self, channel, core, cordic_gain=1.):
self.channel = channel
self.core = core
# normalized DAC output
self._out_scale = (1 << 15) - 1.
# normalized DAC output including DUC cordic gain
self._duc_scale = self._out_scale/cordic_gain
# configuration channel access interval
self._rtio_interval = int64(3*self.core.ref_multiplier)
@kernel
def set_div(self, div: TInt32, n: TInt32=0):
@ -321,3 +326,39 @@ class SAWG:
parallelism/self.core.coarse_ref_period)
self.phase0 = Spline(width, time_width, channel_base + 9,
self.core, 1.)
@kernel
def reset(self):
"""Re-establish initial conditions.
This clears all spline interpolators, accumulators and configuration
settings.
This method advances the timeline by the time required to perform all
eight writes to the configuration channel.
"""
self.frequency0.set_mu(0)
self.frequency1.set_mu(0)
self.frequency2.set_mu(0)
self.phase0.set_mu(0)
self.phase1.set_mu(0)
self.phase2.set_mu(0)
self.amplitude1.set_mu(0)
self.amplitude2.set_mu(0)
self.offset.set_mu(0)
self.config.set_clr(1, 1, 1)
delay_mu(self.config._rtio_interval)
self.config.set_iq_en(1, 0)
delay_mu(self.config._rtio_interval)
self.config.set_duc_i_min(-1.)
delay_mu(self.config._rtio_interval)
self.config.set_duc_i_max(1.)
delay_mu(self.config._rtio_interval)
self.config.set_duc_q_min(-1.)
delay_mu(self.config._rtio_interval)
self.config.set_duc_q_max(1.)
delay_mu(self.config._rtio_interval)
self.config.set_out_min(-1.)
delay_mu(self.config._rtio_interval)
self.config.set_out_max(1.)
delay_mu(self.config._rtio_interval)

5
artiq/examples/phaser/repository/demo_2tone.py
View File

@ -17,6 +17,11 @@ class SAWGTestTwoTone(EnvExperiment):
self.core.reset()
self.ttl_sma.output()
self.sawg0.reset()
self.sawg1.reset()
self.sawg2.reset()
self.sawg3.reset()
self.sawg0.config.set_clr(1, 1, 1)
delay(10*us)
self.sawg0.config.set_out_max(1.)