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ad9910: avoid unnecessary write/param 

Credit: Solution proposed by @pmldrmota in https://github.com/m-labs/artiq/pull/1584#issuecomment-987774353
This commit is contained in:
occheung 2021-12-08 11:21:57 +08:00
parent 1064fdff2e
commit 158a7be74c
1 changed files with 25 additions and 13 deletions
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38
artiq/coredevice/ad9910.py
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@ -516,9 +516,10 @@ class AD9910:
self.cpld.io_update.pulse(1 * us)
@kernel
def set_mu(self, ftw: TInt32, pow_: TInt32 = 0, asf: TInt32 = 0x3fff,
def set_mu(self, ftw: TInt32 = 0, pow_: TInt32 = 0, asf: TInt32 = 0x3fff,
phase_mode: TInt32 = _PHASE_MODE_DEFAULT,
ref_time_mu: TInt64 = int64(-1), profile: TInt32 = 7) -> TInt32:
ref_time_mu: TInt64 = int64(-1), profile: TInt32 = 7,
ram_destination: TInt32 = -1) -> TInt32:
"""Set DDS data in machine units.
This uses machine units (FTW, POW, ASF). The frequency tuning word
@ -543,8 +544,13 @@ class AD9910:
by :meth:`set_phase_mode` for this call.
:param ref_time_mu: Fiducial time used to compute absolute or tracking
phase updates. In machine units as obtained by `now_mu()`.
:param profile: Profile number to set (0-7, default: 7), or -1 to write
parameters to the ASF, FTW and POW registers instead.
:param profile: Single tone profile number to set (0-7, default: 7).
Ineffective if `ram_destination` is specified.
:param ram_destination: RAM destination (:const:`RAM_DEST_FTW`,
:const:`RAM_DEST_POW`, :const:`RAM_DEST_ASF`,
:const:`RAM_DEST_POWASF`). If specified, write free DDS parameters
to the ASF/FTW/POW registers instead of to the single tone profile
register (default behaviour, see `profile`).
:return: Resulting phase offset word after application of phase
tracking offset. When using :const:`PHASE_MODE_CONTINUOUS` in
subsequent calls, use this value as the "current" phase.
@ -567,13 +573,17 @@ class AD9910:
# is equivalent to an output pipeline latency.
dt = int32(now_mu()) - int32(ref_time_mu)
pow_ += dt * ftw * self.sysclk_per_mu >> 16
if profile < 0:
self.set_asf(asf)
self.set_ftw(ftw)
self.set_pow(pow_)
else:
if ram_destination == -1:
self.write64(_AD9910_REG_PROFILE0 + profile,
(asf << 16) | (pow_ & 0xffff), ftw)
else:
if not ram_destination == RAM_DEST_FTW:
self.set_ftw(ftw)
if not ram_destination == RAM_DEST_POWASF:
if not ram_destination == RAM_DEST_ASF:
self.set_asf(asf)
if not ram_destination == RAM_DEST_POW:
self.set_pow(pow_)
delay_mu(int64(self.sync_data.io_update_delay))
self.cpld.io_update.pulse_mu(8) # assumes 8 mu > t_SYN_CCLK
at_mu(now_mu() & ~7) # clear fine TSC again
@ -832,9 +842,10 @@ class AD9910:
return self.pow_to_turns(self.get_pow())
@kernel
def set(self, frequency: TFloat, phase: TFloat = 0.0,
def set(self, frequency: TFloat = 0.0, phase: TFloat = 0.0,
amplitude: TFloat = 1.0, phase_mode: TInt32 = _PHASE_MODE_DEFAULT,
ref_time_mu: TInt64 = int64(-1), profile: TInt32 = 7) -> TFloat:
ref_time_mu: TInt64 = int64(-1), profile: TInt32 = 7,
ram_destination: TInt32 = -1) -> TFloat:
"""Set DDS data in SI units.
.. seealso:: :meth:`set_mu`
@ -844,13 +855,14 @@ class AD9910:
:param amplitude: Amplitude in units of full scale
:param phase_mode: Phase mode constant
:param ref_time_mu: Fiducial time stamp in machine units
:param profile: Registers to affect
:param profile: Single tone profile to affect.
:param ram_destination: RAM destination.
:return: Resulting phase offset in turns
"""
return self.pow_to_turns(self.set_mu(
self.frequency_to_ftw(frequency), self.turns_to_pow(phase),
self.amplitude_to_asf(amplitude), phase_mode, ref_time_mu,
profile))
profile, ram_destination))
@kernel
def get(self, profile: TInt32 = 0) -> TTuple([TFloat, TFloat, TFloat]):