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ad9910: add RAM mode methods 

* also refactor the CFR1 access into a method

c.f. #1154

Signed-off-by: Robert Jördens <rj@quartiq.de>
This commit is contained in:
Robert Jördens 2018-12-10 10:56:06 +00:00
parent 6df4ae934f
commit 79eadb9465
1 changed files with 158 additions and 19 deletions
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177
artiq/coredevice/ad9910.py
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@ -13,7 +13,10 @@ urukul_sta_smp_err = urukul.urukul_sta_smp_err
__all__ = [
"AD9910",
"PHASE_MODE_CONTINUOUS", "PHASE_MODE_ABSOLUTE", "PHASE_MODE_TRACKING"
"PHASE_MODE_CONTINUOUS", "PHASE_MODE_ABSOLUTE", "PHASE_MODE_TRACKING",
"RAM_DEST_FTW", "RAM_DEST_POW", "RAM_DEST_ASF", "RAM_DEST_POWASF",
"RAM_MODE_DIRECTSWITCH", "RAM_MODE_RAMPUP", "RAM_MODE_BIDIR_RAMP",
"RAM_MODE_CONT_BIDIR_RAMP", "RAM_MODE_CONT_RECIRCULATE",
]
@ -44,6 +47,19 @@ _AD9910_REG_PROFILE6 = 0x14
_AD9910_REG_PROFILE7 = 0x15
_AD9910_REG_RAM = 0x16
# RAM destination
RAM_DEST_FTW = 0
RAM_DEST_POW = 1
RAM_DEST_ASF = 2
RAM_DEST_POWASF = 3
# RAM MODES
RAM_MODE_DIRECTSWITCH = 0
RAM_MODE_RAMPUP = 1
RAM_MODE_BIDIR_RAMP = 2
RAM_MODE_CONT_BIDIR_RAMP = 3
RAM_MODE_CONT_RECIRCULATE = 4
class AD9910:
"""
@ -222,6 +238,82 @@ class AD9910:
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write(data_low)
@kernel
def write_ram(self, data):
"""Write data to RAM.
The profile to write to and the step, start, and end address
need to be configured before and separately using
:meth:`set_profile_ram` and the parent CPLD `set_profile`.
:param data List(int32): Data to be written to RAM.
"""
self.bus.set_config_mu(urukul.SPI_CONFIG, 8, urukul.SPIT_DDS_WR,
self.chip_select)
self.bus.write(_AD9910_REG_RAM << 24)
self.bus.set_config_mu(urukul.SPI_CONFIG, 32,
urukul.SPIT_DDS_WR, self.chip_select)
for i in range(len(data) - 1):
self.bus.write(data[i])
self.bus.set_config_mu(urukul.SPI_CONFIG | spi.SPI_END, 32,
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write(data[len(data) - 1])
@kernel
def read_ram(self, data):
"""Read data from RAM.
The profile to read from and the step, start, and end address
need to be configured before and separately using
:meth:`set_profile_ram` and the parent CPLD `set_profile`.
:param data List(int32): List to be filled with data read from RAM.
"""
self.bus.set_config_mu(urukul.SPI_CONFIG, 8, urukul.SPIT_DDS_WR,
self.chip_select)
self.bus.write((_AD9910_REG_RAM | 0x80) << 24)
self.bus.set_config_mu(urukul.SPI_CONFIG | spi.SPI_INPUT, 32,
urukul.SPIT_DDS_RD, self.chip_select)
preload = 8
for i in range(len(data) - 1):
self.bus.write(0)
if i >= preload:
data[i - preload] = self.bus.read()
self.bus.set_config_mu(
urukul.SPI_CONFIG | spi.SPI_INPUT | spi.SPI_END, 32,
urukul.SPIT_DDS_RD, self.chip_select)
self.bus.write(0)
for i in range(preload + 1):
data[(len(data) - preload - 1) + i] = self.bus.read()
@kernel
def set_cfr1(self, power_down=0b0000, phase_autoclear=0,
drg_load_lrr=0, drg_autoclear=0,
internal_profile=0, ram_destination=0, ram_enable=0):
"""Set CFR1. See the AD9910 datasheet for parameter meanings.
This method does not pulse IO_UPDATE.
:param power_down: Power down bits.
:param phase_autoclear: Autoclear phase accumulator.
:param drg_load_lrr: Load digital ramp generator LRR.
:param drg_autoclear: Autoclear digital ramp generator.
:param internal_profile: Internal profile control.
:param ram_destination: RAM destination
(:const:`_AD9910_RAM_DEST_FTW`, :const:`_AD9910_RAM_DEST_POW`,
:const:`_AD9910_RAM_DEST_ASF`, :const:`_AD9910_RAM_DEST_POWASF`).
:param ram_enable: RAM mode enable.
"""
self.write32(_AD9910_REG_CFR1,
(ram_enable << 31) |
(ram_destination << 29) |
(internal_profile << 17) |
(drg_load_lrr << 15) |
(drg_autoclear << 14) |
(phase_autoclear << 13) |
(power_down << 4) |
2) # SDIO input only, MSB first
@kernel
def init(self, blind=False):
"""Initialize and configure the DDS.
@ -233,7 +325,7 @@ class AD9910:
:param blind: Do not read back DDS identity and do not wait for lock.
"""
# Set SPI mode
self.write32(_AD9910_REG_CFR1, 0x00000002)
self.set_cfr1()
self.cpld.io_update.pulse(1*us)
delay(1*ms)
if not blind:
@ -274,13 +366,13 @@ class AD9910:
def power_down(self, bits=0b1111):
"""Power down DDS.
:param bits: power down bits, see datasheet
:param bits: Power down bits, see datasheet
"""
self.write32(_AD9910_REG_CFR1, 0x00000002 | (bits << 4))
self.set_cfr1(power_down=bits)
self.cpld.io_update.pulse(1*us)
@kernel
def set_mu(self, ftw, pow=0, asf=0x3fff, phase_mode=_PHASE_MODE_DEFAULT,
def set_mu(self, ftw, pow_=0, asf=0x3fff, phase_mode=_PHASE_MODE_DEFAULT,
ref_time=-1, profile=0):
"""Set profile 0 data in machine units.
@ -295,7 +387,7 @@ class AD9910:
phase modes.
:param ftw: Frequency tuning word: 32 bit.
:param pow: Phase tuning word: 16 bit unsigned.
:param pow_: Phase tuning word: 16 bit unsigned.
:param asf: Amplitude scale factor: 14 bit unsigned.
:param phase_mode: If specified, overrides the default phase mode set
by :meth:`set_phase_mode` for this call.
@ -313,7 +405,7 @@ class AD9910:
if phase_mode != PHASE_MODE_CONTINUOUS:
# Auto-clear phase accumulator on IO_UPDATE.
# This is active already for the next IO_UPDATE
self.write32(_AD9910_REG_CFR1, 0x00002002)
self.set_cfr1(phase_autoclear=1)
if phase_mode == PHASE_MODE_TRACKING and ref_time < 0:
# set default fiducial time stamp
ref_time = 0
@ -322,15 +414,51 @@ class AD9910:
# Also no need to use IO_UPDATE time as this
# is equivalent to an output pipeline latency.
dt = int32(now_mu()) - int32(ref_time)
pow += dt*ftw*self.sysclk_per_mu >> 16
self.write64(_AD9910_REG_PROFILE0 + profile, (asf << 16) | pow, ftw)
pow_ += dt*ftw*self.sysclk_per_mu >> 16
self.write64(_AD9910_REG_PROFILE0 + profile, (asf << 16) | pow_, ftw)
delay_mu(int64(self.io_update_delay))
self.cpld.io_update.pulse_mu(8) # assumes 8 mu > t_SYSCLK
at_mu(now_mu() & ~0xf)
if phase_mode != PHASE_MODE_CONTINUOUS:
self.write32(_AD9910_REG_CFR1, 0x00000002)
self.set_cfr1()
# future IO_UPDATE will activate
return pow
return pow_
@kernel
def set_profile_ram(self, start, end, step=1, profile=0, nodwell_high=0,
zero_crossing=0, mode=1):
"""Set the RAM profile settings.
:param start: Profile start address in RAM.
:param end: Profile end address in RAM (last address).
:param step: Profile address step size (default: 1).
:param profile: Profile index (0 to 7) (default: 0).
:param nodwell_high: No-dwell high bit (default: 0,
see AD9910 documentation).
:param zero_crossing: Zero crossing bit (default: 0,
see AD9910 documentation).
:param mode: Profile RAM mode (:const:`RAM_MODE_DIRECTSWITCH`,
:const:`RAM_MODE_RAMPUP`, :const:`RAM_MODE_BIDIR_RAMP`,
:const:`RAM_MODE_CONT_BIDIR_RAMP`, or
:const:`RAM_MODE_CONT_RECIRCULATE`, default:
:const:`RAM_MODE_RAMPUP`)
"""
hi = (step << 8) | (end >> 2)
lo = ((end << 30) | (start << 14) | (nodwell_high << 5) |
(zero_crossing << 3) | mode)
self.write64(_AD9910_REG_PROFILE0 + profile, hi, lo)
@kernel
def set_ftw(self, ftw):
self.write32(_AD9910_REG_FTW, ftw)
@kernel
def set_asf(self, asf):
self.write32(_AD9910_REG_ASF, asf)
@kernel
def set_pow(self, pow_):
self.write32(_AD9910_REG_POW, pow_)
@portable(flags={"fast-math"})
def frequency_to_ftw(self, frequency):
@ -351,10 +479,22 @@ class AD9910:
return int32(round(amplitude*0x3ffe))
@portable(flags={"fast-math"})
def pow_to_turns(self, pow):
def pow_to_turns(self, pow_):
"""Return the phase in turns corresponding to a given phase offset
word."""
return pow/0x10000
return pow_/0x10000
@kernel
def set_frequency(self, frequency):
return self.set_ftw(self.frequency_to_ftw(frequency))
@kernel
def set_amplitude(self, amplitude):
return self.set_asf(self.amplitude_to_asf(amplitude))
@kernel
def set_phase(self, turns):
return self.set_pow(self.turns_to_pow(turns))
@kernel
def set(self, frequency, phase=0.0, amplitude=1.0,
@ -363,9 +503,9 @@ class AD9910:
.. seealso:: :meth:`set_mu`
:param ftw: Frequency in Hz
:param pow: Phase tuning word in turns
:param asf: Amplitude in units of full scale
:param frequency: Frequency in Hz
:param phase: Phase tuning word in turns
:param amplitude: Amplitude in units of full scale
:param phase_mode: Phase mode constant
:param ref_time: Fiducial time stamp in machine units
:param profile: Profile to affect
@ -509,8 +649,7 @@ class AD9910:
:return: Odd/even SYNC_CLK cycle indicator.
"""
# set up DRG
# DRG ACC autoclear and LRR on io update
self.write32(_AD9910_REG_CFR1, 0x0000c002)
self.set_cfr1(drg_load_lrr=1, drg_autoclear=1)
# DRG -> FTW, DRG enable
self.write32(_AD9910_REG_CFR2, 0x01090000)
# no limits
@ -524,7 +663,7 @@ class AD9910:
at_mu(t + delay_start)
self.cpld.io_update.pulse_mu(32 - delay_start) # realign
# disable DRG autoclear and LRR on io_update
self.write32(_AD9910_REG_CFR1, 0x00000002)
self.set_cfr1()
# stop DRG
self.write64(_AD9910_REG_RAMP_STEP, 0, 0)
at_mu(t + 0x1000 + delay_stop)