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ad9914: fix set_mu

This commit is contained in:
Sebastien Bourdeauducq 2018-05-14 00:18:54 +08:00
parent 00cb31b804
commit 194d6462ee
1 changed files with 6 additions and 8 deletions
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14
artiq/coredevice/ad9914.py
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@ -174,20 +174,18 @@ class AD9914:
self.phase_mode = phase_mode self.phase_mode = phase_mode
@kernel @kernel
def set_mu(self, frequency, phase=0, phase_mode=_PHASE_MODE_DEFAULT, def set_mu(self, ftw, pow=0, phase_mode=_PHASE_MODE_DEFAULT,
amplitude=0x0fff, ref_time=-1): asf=0x0fff, ref_time=-1):
"""Sets the DDS channel to the specified frequency and phase. """Sets the DDS channel to the specified frequency and phase.
This uses machine units (FTW and POW). The frequency tuning word width This uses machine units (FTW and POW). The frequency tuning word width
is 32, whereas the phase offset word width depends on the type of DDS is 32, and the phase offset word width is 16.
chip and can be retrieved via the ``pow_width`` attribute. The amplitude
width is 12.
The "frequency update" pulse is sent to the DDS with a fixed latency The "frequency update" pulse is sent to the DDS with a fixed latency
with respect to the current position of the time cursor. with respect to the current position of the time cursor.
:param frequency: frequency to generate. :param ftw: frequency to generate.
:param phase: adds an offset, in turns, to the phase. :param pow: adds an offset 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 ref_time: reference time used to compute phase. Specifying this :param ref_time: reference time used to compute phase. Specifying this
@ -223,7 +221,7 @@ class AD9914:
self.continuous_phase_comp = pow self.continuous_phase_comp = pow
self.write(AD9914_REG_POW, pow) self.write(AD9914_REG_POW, pow)
self.write(AD9914_REG_ASF, amplitude) self.write(AD9914_REG_ASF, asf)
self.write(AD9914_FUD, 0) self.write(AD9914_FUD, 0)
@portable(flags={"fast-math"}) @portable(flags={"fast-math"})