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Simplified use of the AD9910 RAM feature (#1584)

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* coredevice: Change Urukul default single-tone profile to 7

This allows using the internal profile control in RAM modulation mode (which always starts to play back at profile 0) without competing for the content of the profile 0 register used in single tone mode.

Signed-off-by: Peter Drmota <peter.drmota@physics.ox.ac.uk>

* ad9910/set_mu: comment on caveats when setting register

* ad9910: avoid unnecessary write/param

Credit: Solution proposed by @pmldrmota in https://github.com/m-labs/artiq/pull/1584#issuecomment-987774353

* revert 1064fdff (`set_mu()` comments)

158a7be7 had addressed this issue.

Co-authored-by: occheung <dc@m-labs.hk>
This commit is contained in:
Peter Drmota 2021-12-13 15:44:03 +00:00 committed by GitHub
parent 33a9ca2684
commit 7c664142a5
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3 changed files with 36 additions and 15 deletions
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7
RELEASE_NOTES.rst
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@ -84,8 +84,11 @@ Highlights:
- Improved performance for kernel RPC involving list and array.
* Coredevice SI to mu conversions now always return valid codes, or raise a ``ValueError``.
* Zotino now exposes ``voltage_to_mu()``
* ``ad9910``: The maximum amplitude scale factor is now ``0x3fff`` (was ``0x3ffe``
before).
* ``ad9910``:
- The maximum amplitude scale factor is now ``0x3fff`` (was ``0x3ffe`` before).
- The default single-tone profile is now 7 (was 0).
- Added option to ``set_mu()`` that affects the ASF, FTW and POW registers
instead of the single-tone profile register.
* Mirny now supports HW revision independent, human readable ``clk_sel`` parameters:
"XO", "SMA", and "MMCX". Passing an integer is backwards compatible.
* Dashboard:

42
artiq/coredevice/ad9910.py
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@ -236,7 +236,7 @@ class AD9910:
"""
self.bus.set_config_mu(urukul.SPI_CONFIG | spi.SPI_END, 24,
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write((addr << 24) | (data << 8))
self.bus.write((addr << 24) | ((data & 0xffff) << 8))
@kernel
def write32(self, addr: TInt32, data: TInt32):
@ -516,10 +516,11 @@ 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 = 0) -> TInt32:
"""Set profile 0 data in machine units.
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
width is 32, the phase offset word width is 16, and the amplitude
@ -538,7 +539,13 @@ 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: 0).
: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.
@ -561,8 +568,17 @@ 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
self.write64(_AD9910_REG_PROFILE0 + profile,
(asf << 16) | (pow_ & 0xffff), ftw)
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
@ -821,10 +837,11 @@ 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 = 0) -> TFloat:
"""Set profile 0 data in SI units.
ref_time_mu: TInt64 = int64(-1), profile: TInt32 = 7,
ram_destination: TInt32 = -1) -> TFloat:
"""Set DDS data in SI units.
.. seealso:: :meth:`set_mu`
@ -833,13 +850,14 @@ 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: Profile 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]):

2
artiq/coredevice/urukul.py
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@ -188,7 +188,7 @@ class CPLD:
assert sync_div is None
sync_div = 0
self.cfg_reg = urukul_cfg(rf_sw=rf_sw, led=0, profile=0,
self.cfg_reg = urukul_cfg(rf_sw=rf_sw, led=0, profile=7,
io_update=0, mask_nu=0, clk_sel=clk_sel,
sync_sel=sync_sel,
rst=0, io_rst=0, clk_div=clk_div)