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dds: make it easier to specify phase

This commit is contained in:
Sebastien Bourdeauducq 2015-06-26 12:05:11 +02:00
parent dd2c1d1b72
commit e6a4c2fb36
1 changed files with 5 additions and 5 deletions
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10
artiq/coredevice/dds.py
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@ -3,7 +3,7 @@ from artiq.language.db import *
from artiq.language.units import * from artiq.language.units import *
PHASE_MODE_DEFAULT = -1 _PHASE_MODE_DEFAULT = -1
# keep in sync with dds.h # keep in sync with dds.h
PHASE_MODE_CONTINUOUS = 0 PHASE_MODE_CONTINUOUS = 0
PHASE_MODE_ABSOLUTE = 1 PHASE_MODE_ABSOLUTE = 1
@ -104,17 +104,17 @@ class DDS(AutoDB):
self.phase_mode = phase_mode self.phase_mode = phase_mode
@kernel @kernel
def set(self, frequency, phase_mode=PHASE_MODE_DEFAULT, phase_offset=0): def set(self, frequency, phase=0, phase_mode=_PHASE_MODE_DEFAULT):
"""Sets the DDS channel to the specified frequency and phase. """Sets the DDS channel to the specified frequency and phase.
:param frequency: frequency to generate. :param frequency: frequency to generate.
:param phase: adds an offset, in turns, to the phase.
:param phase_mode: if specified, overrides the default phase mode set :param phase_mode: if specified, overrides the default phase mode set
by ``set_phase_mode`` for this call. by ``set_phase_mode`` for this call.
:param phase_offset: adds an offset, in turns, to the phase.
""" """
if phase_mode == PHASE_MODE_DEFAULT: if phase_mode == _PHASE_MODE_DEFAULT:
phase_mode = self.phase_mode phase_mode = self.phase_mode
syscall("dds_set", time_to_cycles(now()), self.channel, syscall("dds_set", time_to_cycles(now()), self.channel,
self.frequency_to_ftw(frequency), round(phase_offset*2**14), self.frequency_to_ftw(frequency), round(phase*2**14),
phase_mode) phase_mode)