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pdq: unify spi-PDQ and usb-PDQ protocols

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This commit is contained in:
Robert Jördens 2017-06-10 14:59:03 +02:00
parent 6c54c0f834
commit 566ff73dff
8 changed files with 567 additions and 582 deletions
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78
artiq/coredevice/pdq.py
View File

@ -1,5 +1,6 @@
from artiq.language.core import kernel, portable, delay_mu
from artiq.coredevice import spi
from artiq.devices.pdq.protocol import PDQBase, PDQ_CMD
_PDQ_SPI_CONFIG = (
@ -9,27 +10,8 @@ _PDQ_SPI_CONFIG = (
)
@portable
def _PDQ_CMD(board, is_mem, adr, we):
"""Pack PDQ command fields into command byte.
:param board: Board address, 0 to 15, with ``15 = 0xf`` denoting broadcast
to all boards connected.
:param is_mem: If ``1``, ``adr`` denote the address of the memory to access
(0 to 2). Otherwise ``adr`` denotes the register to access.
:param adr: Address of the register or memory to access.
(``_PDQ_ADR_CONFIG``, ``_PDQ_ADR_FRAME``, ``_PDQ_ADR_CRC``).
:param we: If ``1`` then write, otherwise read.
"""
return (adr << 0) | (is_mem << 2) | (board << 3) | (we << 7)
_PDQ_ADR_CONFIG = 0
_PDQ_ADR_CRC = 1
_PDQ_ADR_FRAME = 2
class PDQ:
class PDQ(PDQBase):
"""PDQ smart arbitrary waveform generator stack.
Provides access to a stack of PDQ boards connected via SPI using PDQ
@ -50,10 +32,11 @@ class PDQ:
kernel_invariants = {"core", "chip_select", "bus"}
def __init__(self, dmgr, spi_device, chip_select=1):
def __init__(self, dmgr, spi_device, chip_select=1, **kwargs):
self.core = dmgr.get("core")
self.bus = dmgr.get(spi_device)
self.chip_select = chip_select
PDQBase.__init__(self, **kwargs)
@kernel
def setup_bus(self, write_div=24, read_div=64):
@ -82,7 +65,7 @@ class PDQ:
:param data: Register data (8 bit).
:param board: Board to access, ``0xf`` to write to all boards.
"""
self.bus.write((_PDQ_CMD(board, 0, adr, 1) << 24) | (data << 16))
self.bus.write((PDQ_CMD(board, 0, adr, 1) << 24) | (data << 16))
delay_mu(self.bus.ref_period_mu) # get to 20ns min cs high
@kernel
@ -96,57 +79,12 @@ class PDQ:
:return: Register data (8 bit).
"""
self.bus.set_xfer(self.chip_select, 16, 8)
self.bus.write(_PDQ_CMD(board, 0, adr, 0) << 24)
self.bus.write(PDQ_CMD(board, 0, adr, 0) << 24)
delay_mu(self.bus.ref_period_mu) # get to 20ns min cs high
self.bus.read_async()
self.bus.set_xfer(self.chip_select, 16, 0)
return int(self.bus.input_async() & 0xff) # FIXME: m-labs/artiq#713
@kernel
def write_config(self, reset=0, clk2x=0, enable=1,
trigger=0, aux_miso=0, aux_dac=0b111, board=0xf):
"""Set configuration register.
:param reset: Reset board (auto-clear).
:param clk2x: Enable clock double (100 MHz).
:param enable: Enable the reading and execution of waveform data from
memory.
:param trigger: Software trigger, logical OR with ``F1 TTL Input
Trigger``.
:param aux_miso: Use ``F5 OUT`` for ``MISO``. If ``0``, use the
masked logical OR of the DAC channels.
:param aux_dac: DAC channel mask to for AUX (``F5 OUT``) output.
:param board: Boards to address, ``0xf`` to write to all boards.
"""
config = ((reset << 0) | (clk2x << 1) | (enable << 2) |
(trigger << 3) | (aux_miso << 4) | (aux_dac << 5))
self.write_reg(_PDQ_ADR_CONFIG, config, board)
@kernel
def read_config(self, board=0xf):
"""Read configuration register."""
return self.read_reg(_PDQ_ADR_CONFIG, board)
@kernel
def write_crc(self, crc, board=0xf):
"""Write checksum register."""
self.write_reg(_PDQ_ADR_CRC, crc, board)
@kernel
def read_crc(self, board=0xf):
"""Read checksum register."""
return self.read_reg(_PDQ_ADR_CRC, board)
@kernel
def write_frame(self, frame, board=0xf):
"""Write frame selection register."""
self.write_reg(_PDQ_ADR_FRAME, frame, board)
@kernel
def read_frame(self, board=0xf):
"""Read frame selection register."""
return self.read_reg(_PDQ_ADR_FRAME, board)
@kernel
def write_mem(self, mem, adr, data, board=0xf): # FIXME: m-labs/artiq#714
"""Write to DAC channel waveform data memory.
@ -158,7 +96,7 @@ class PDQ:
to all boards.
"""
self.bus.set_xfer(self.chip_select, 24, 0)
self.bus.write((_PDQ_CMD(board, 1, mem, 1) << 24) |
self.bus.write((PDQ_CMD(board, 1, mem, 1) << 24) |
((adr & 0x00ff) << 16) | (adr & 0xff00))
delay_mu(-self.bus.write_period_mu-3*self.bus.ref_period_mu)
self.bus.set_xfer(self.chip_select, 16, 0)
@ -182,7 +120,7 @@ class PDQ:
if not n:
return
self.bus.set_xfer(self.chip_select, 24, 8)
self.bus.write((_PDQ_CMD(board, 1, mem, 0) << 24) |
self.bus.write((PDQ_CMD(board, 1, mem, 0) << 24) |
((adr & 0x00ff) << 16) | (adr & 0xff00))
delay_mu(-self.bus.write_period_mu-3*self.bus.ref_period_mu)
self.bus.set_xfer(self.chip_select, 0, 16)

35
artiq/devices/pdq/crc.py Normal file
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@ -0,0 +1,35 @@
class CRC:
"""Generic and simple table driven CRC calculator.
This implementation is:
* MSB first data
* "un-reversed" full polynomial (i.e. starts with 0x1)
* no initial complement
* no final complement
Handle any variation on those details outside this class.
>>> r = CRC(0x1814141AB)(b"123456789") # crc-32q
>>> assert r == 0x3010BF7F, hex(r)
"""
def __init__(self, poly, data_width=8):
self.poly = poly
self.crc_width = poly.bit_length() - 1
self.data_width = data_width
self._table = [self._one(i << self.crc_width - data_width)
for i in range(1 << data_width)]
def _one(self, i):
for j in range(self.data_width):
i <<= 1
if i & 1 << self.crc_width:
i ^= self.poly
return i
def __call__(self, msg, crc=0):
for data in msg:
p = data ^ crc >> self.crc_width - self.data_width
q = crc << self.data_width & (1 << self.crc_width) - 1
crc = self._table[p] ^ q
return crc

525
artiq/devices/pdq/driver.py
View File

@ -22,480 +22,24 @@ import struct
import serial
from artiq.wavesynth.coefficients import discrete_compensate
from artiq.language.core import kernel, portable, delay_mu
from .crc import CRC
from .protocol import PDQBase, PDQ_CMD
logger = logging.getLogger(__name__)
def discrete_compensate(c):
"""Compensate spline coefficients for discrete accumulators.
Given continuous-time b-spline coefficients, this function
compensates for the effect of discrete time steps in the
target devices.
The compensation is performed in-place.
"""
l = len(c)
if l > 2:
c[1] += c[2]/2.
if l > 3:
c[1] += c[3]/6.
c[2] += c[3]
if l > 4:
raise ValueError("Only splines up to cubic order are supported.")
class CRC:
"""Generic and simple table driven CRC calculator.
This implementation is:
* MSB first data
* "un-reversed" full polynomial (i.e. starts with 0x1)
* no initial complement
* no final complement
Handle any variation on those details outside this class.
>>> r = CRC(0x1814141AB)(b"123456789") # crc-32q
>>> assert r == 0x3010BF7F, hex(r)
"""
def __init__(self, poly, data_width=8):
self.poly = poly
self.crc_width = poly.bit_length() - 1
self.data_width = data_width
self._table = [self._one(i << self.crc_width - data_width)
for i in range(1 << data_width)]
def _one(self, i):
for j in range(self.data_width):
i <<= 1
if i & 1 << self.crc_width:
i ^= self.poly
return i
def __call__(self, msg, crc=0):
for data in msg:
p = data ^ crc >> self.crc_width - self.data_width
q = crc << self.data_width & (1 << self.crc_width) - 1
crc = self._table[p] ^ q
return crc
crc8 = CRC(0x107)
class Segment:
"""Serialize the lines for a single Segment.
Attributes:
max_time (int): Maximum duration of a line.
max_val (int): Maximum absolute value (scale) of the DAC output.
max_out (float): Output voltage at :attr:`max_val`. In Volt.
out_scale (float): Steps per Volt.
cordic_gain (float): CORDIC amplitude gain.
addr (int): Address assigned to this segment.
data (bytes): Serialized segment data.
"""
max_time = 1 << 16 # uint16 timer
max_val = 1 << 15 # int16 DAC
max_out = 10. # Volt
out_scale = max_val/max_out
cordic_gain = 1.
for i in range(16):
cordic_gain *= sqrt(1 + 2**(-2*i))
def __init__(self):
self.data = b""
self.addr = None
def line(self, typ, duration, data, trigger=False, silence=False,
aux=False, shift=0, jump=False, clear=False, wait=False):
"""Append a line to this segment.
Args:
typ (int): Output module to target with this line.
duration (int): Duration of the line in units of
``clock_period*2**shift``.
data (bytes): Opaque data for the output module.
trigger (bool): Wait for trigger assertion before executing
this line.
silence (bool): Disable DAC clocks for the duration of this line.
aux (bool): Assert the AUX (F5 TTL) output during this line.
The corresponding global AUX routing setting determines which
channels control AUX.
shift (int): Duration and spline evolution exponent.
jump (bool): Return to the frame address table after this line.
clear (bool): Clear the DDS phase accumulator when starting to
exectute this line.
wait (bool): Wait for trigger assertion before executing the next
line.
"""
assert len(data) % 2 == 0, data
assert len(data)//2 <= 14
# assert dt*(1 << shift) > 1 + len(data)//2
header = (
1 + len(data)//2 | (typ << 4) | (trigger << 6) | (silence << 7) |
(aux << 8) | (shift << 9) | (jump << 13) | (clear << 14) |
(wait << 15)
)
self.data += struct.pack("<HH", header, duration) + data
@staticmethod
def pack(widths, values):
"""Pack spline data.
Args:
widths (list[int]): Widths of values in multiples of 16 bits.
values (list[int]): Values to pack.
Returns:
data (bytes): Packed data.
"""
fmt = "<"
ud = []
for width, value in zip(widths, values):
value = int(round(value * (1 << 16*width)))
if width == 2:
ud.append(value & 0xffff)
fmt += "H"
value >>= 16
width -= 1
ud.append(value)
fmt += "hi"[width]
try:
return struct.pack(fmt, *ud)
except struct.error as e:
logger.error("can not pack %s as %s (%s as %s): %s",
values, widths, ud, fmt, e)
raise e
def bias(self, amplitude=[], **kwargs):
"""Append a bias line to this segment.
Args:
amplitude (list[float]): Amplitude coefficients in in Volts and
increasing powers of ``1/(2**shift*clock_period)``.
Discrete time compensation will be applied.
**kwargs: Passed to :meth:`line`.
"""
coef = [self.out_scale*a for a in amplitude]
discrete_compensate(coef)
data = self.pack([0, 1, 2, 2], coef)
self.line(typ=0, data=data, **kwargs)
def dds(self, amplitude=[], phase=[], **kwargs):
"""Append a DDS line to this segment.
Args:
amplitude (list[float]): Amplitude coefficients in in Volts and
increasing powers of ``1/(2**shift*clock_period)``.
Discrete time compensation and CORDIC gain compensation
will be applied by this method.
phase (list[float]): Phase/frequency/chirp coefficients.
``phase[0]`` in ``turns``,
``phase[1]`` in ``turns/clock_period``,
``phase[2]`` in ``turns/(clock_period**2*2**shift)``.
**kwargs: Passed to :meth:`line`.
"""
scale = self.out_scale/self.cordic_gain
coef = [scale*a for a in amplitude]
discrete_compensate(coef)
if phase:
assert len(amplitude) == 4
coef += [p*self.max_val*2 for p in phase]
data = self.pack([0, 1, 2, 2, 0, 1, 1], coef)
self.line(typ=1, data=data, **kwargs)
class Channel:
"""PDQ Channel.
Attributes:
num_frames (int): Number of frames supported.
max_data (int): Number of 16 bit data words per channel.
segments (list[Segment]): Segments added to this channel.
"""
def __init__(self, max_data, num_frames):
self.max_data = max_data
self.num_frames = num_frames
self.segments = []
def clear(self):
"""Remove all segments."""
self.segments.clear()
def new_segment(self):
"""Create and attach a new :class:`Segment` to this channel.
Returns:
:class:`Segment`
"""
segment = Segment()
self.segments.append(segment)
return segment
def place(self):
"""Place segments contiguously.
Assign segment start addresses and determine length of data.
Returns:
addr (int): Amount of memory in use on this channel.
"""
addr = self.num_frames
for segment in self.segments:
segment.addr = addr
addr += len(segment.data)//2
assert addr <= self.max_data, addr
return addr
def table(self, entry=None):
"""Generate the frame address table.
Unused frame indices are assigned the zero address in the frame address
table.
This will cause the memory parser to remain in the frame address table
until another frame is selected.
The frame entry segments can be any segments in the channel.
Args:
entry (list[Segment]): List of initial segments for each frame.
If not specified, the first :attr:`num_frames` segments are
used as frame entry points.
Returns:
table (bytes): Frame address table.
"""
table = [0] * self.num_frames
if entry is None:
entry = self.segments
for i, frame in enumerate(entry):
if frame is not None:
table[i] = frame.addr
return struct.pack("<" + "H"*self.num_frames, *table)
def serialize(self, entry=None):
"""Serialize the memory for this channel.
Places the segments contiguously in memory after the frame table.
Allocates and assigns segment and frame table addresses.
Serializes segment data and prepends frame address table.
Args:
entry (list[Segment]): See :meth:`table`.
Returns:
data (bytes): Channel memory data.
"""
self.place()
data = b"".join([segment.data for segment in self.segments])
return self.table(entry) + data
class PdqBase:
"""
PDQ stack.
Attributes:
checksum (int): Running checksum of data written.
num_channels (int): Number of channels in this stack.
num_boards (int): Number of boards in this stack.
num_dacs (int): Number of DAC outputs per board.
num_frames (int): Number of frames supported.
channels (list[Channel]): List of :class:`Channel` in this stack.
"""
freq = 50e6
_mem_sizes = [None, (20,), (10, 10), (8, 6, 6)] # 10kx16 units
def __init__(self, num_boards=3, num_dacs=3, num_frames=32):
"""Initialize PDQ stack.
Args:
num_boards (int): Number of boards in this stack.
num_dacs (int): Number of DAC outputs per board.
num_frames (int): Number of frames supported.
"""
self.checksum = 0
self.num_boards = num_boards
self.num_dacs = num_dacs
self.num_frames = num_frames
self.num_channels = self.num_dacs * self.num_boards
m = self._mem_sizes[num_dacs]
self.channels = [Channel(m[j] << 11, num_frames)
for i in range(num_boards)
for j in range(num_dacs)]
def get_num_boards(self):
return self.num_boards
def get_num_channels(self):
return self.num_channels
def get_num_frames(self):
return self.num_frames
def get_freq(self):
return self.freq
def set_freq(self, freq):
self.freq = float(freq)
def _cmd(self, board, is_mem, adr, we):
return (adr << 0) | (is_mem << 2) | (board << 3) | (we << 7)
def write(self, data):
raise NotImplementedError
def write_reg(self, board, adr, data):
"""Write to a configuration register.
Args:
board (int): Board to write to (0-0xe), 0xf for all boards.
adr (int): Register address to write to (0-3).
data (int): Data to write (1 byte)
"""
self.write(struct.pack(
"<BB", self._cmd(board, False, adr, True), data))
def set_config(self, reset=False, clk2x=False, enable=True,
trigger=False, aux_miso=False, aux_dac=0b111, board=0xf):
"""Set the configuration register.
Args:
reset (bool): Reset the board. Memory is not reset. Self-clearing.
clk2x (bool): Enable the clock multiplier (100 MHz instead of 50
MHz)
enable (bool): Enable the channel data parsers and spline
interpolators.
trigger (bool): Soft trigger. Logical or with the hardware trigger.
aux_miso (bool): Drive SPI MISO on the AUX/F5 ttl port of each
board. If `False`, drive the masked logical or of the DAC
channels' aux data.
aux_dac (int): Mask for AUX/F5. Each bit represents one channel.
AUX/F5 is: `aux_miso ? spi_miso :
(aux_dac & Cat(_.aux for _ in channels) != 0)`
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
self.write_reg(board, 0, (reset << 0) | (clk2x << 1) | (enable << 2) |
(trigger << 3) | (aux_miso << 4) | (aux_dac << 5))
def set_checksum(self, crc=0, board=0xf):
"""Set/reset the checksum register.
Args:
crc (int): Checksum value to write.
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
self.write_reg(board, 1, crc)
def set_frame(self, frame, board=0xf):
"""Set the current frame.
Args:
frame (int): Frame to select.
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
self.write_reg(board, 2, frame)
def write_mem(self, channel, data, start_addr=0):
"""Write to channel memory.
Args:
channel (int): Channel index to write to. Assumes every board in
the stack has :attr:`num_dacs` DAC outputs.
data (bytes): Data to write to memory.
start_addr (int): Start address to write data to.
"""
board, dac = divmod(channel, self.num_dacs)
self.write(struct.pack("<BH", self._cmd(board, True, dac, True),
start_addr) + data)
def program_segments(self, segments, data):
"""Append the wavesynth lines to the given segments.
Args:
segments (list[Segment]): List of :class:`Segment` to append the
lines to.
data (list): List of wavesynth lines.
"""
for i, line in enumerate(data):
dac_divider = line.get("dac_divider", 1)
shift = int(log(dac_divider, 2))
if 2**shift != dac_divider:
raise ValueError("only power-of-two dac_dividers supported")
duration = line["duration"]
trigger = line.get("trigger", False)
for segment, data in zip(segments, line["channel_data"]):
silence = data.pop("silence", False)
if len(data) != 1:
raise ValueError("only one target per channel and line "
"supported")
for target, target_data in data.items():
getattr(segment, target)(
shift=shift, duration=duration, trigger=trigger,
silence=silence, **target_data)
def program(self, program, channels=None):
"""Serialize a wavesynth program and write it to the channels
in the stack.
The :class:`Channel` targeted are cleared and each frame in the
wavesynth program is appended to a fresh set of :class:`Segment`
of the channels. All segments are allocated, the frame address tale
is generated, the channels are serialized and their memories are
written.
Short single-cycle lines are prepended and appended to each frame to
allow proper write interlocking and to assure that the memory reader
can be reliably parked in the frame address table.
The first line of each frame is mandatorily triggered.
Args:
program (list): Wavesynth program to serialize.
channels (list[int]): Channel indices to use. If unspecified, all
channels are used.
"""
if channels is None:
channels = range(self.num_channels)
chs = [self.channels[i] for i in channels]
for channel in chs:
channel.clear()
for frame in program:
segments = [c.new_segment() for c in chs]
self.program_segments(segments, frame)
# append an empty line to stall the memory reader before jumping
# through the frame table (`wait` does not prevent reading
# the next line)
for segment in segments:
segment.line(typ=3, data=b"", trigger=True, duration=1, aux=1,
jump=True)
for channel, ch in zip(channels, chs):
self.write_mem(channel, ch.serialize())
def disable(self, **kwargs):
"""Disable the device."""
self.set_config(enable=False, **kwargs)
self.flush()
def enable(self, **kwargs):
"""Enable the device."""
self.set_config(enable=True, **kwargs)
self.flush()
def ping(self):
"""Ping method returning True. Required for ARTIQ remote
controller."""
return True
class Pdq(PdqBase):
class PDQ(PDQBase):
def __init__(self, url=None, dev=None, **kwargs):
"""Initialize PDQ USB/Parallel device stack.
.. note:: This device should only be used if the PDQ is intended to be
configured using the USB connection and **not** via SPI.
Args:
url (str): Pyserial device URL. Can be ``hwgrep://`` style
(search for serial number, bus topology, USB VID:PID
@ -503,12 +47,13 @@ class Pdq(PdqBase):
``/dev/ttyUSB0`` for a Linux serial port.
dev (file-like): File handle to use as device. If passed, ``url``
is ignored.
**kwargs: See :class:`PdqBase` .
**kwargs: See :class:`PDQBase` .
"""
if dev is None:
dev = serial.serial_for_url(url)
self.dev = dev
PdqBase.__init__(self, **kwargs)
self.crc = 0
PDQBase.__init__(self, **kwargs)
def write(self, data):
"""Write data to the PDQ board over USB/parallel.
@ -524,7 +69,31 @@ class Pdq(PdqBase):
written = self.dev.write(msg)
if isinstance(written, int):
assert written == len(msg), (written, len(msg))
self.checksum = crc8(data, self.checksum)
self.crc = crc8(data, self.crc)
def write_reg(self, adr, data, board):
"""Write to a configuration register.
Args:
board (int): Board to write to (0-0xe), 0xf for all boards.
adr (int): Register address to write to (0-3).
data (int): Data to write (1 byte)
"""
self.write(struct.pack(
"<BB", PDQ_CMD(board, False, adr, True), data))
def write_mem(self, channel, data, start_addr=0):
"""Write to channel memory.
Args:
channel (int): Channel index to write to. Assumes every board in
the stack has :attr:`num_dacs` DAC outputs.
data (bytes): Data to write to memory.
start_addr (int): Start address to write data to.
"""
board, dac = divmod(channel, self.num_dacs)
self.write(struct.pack("<BH", PDQ_CMD(board, True, dac, True),
start_addr) + data)
def close(self):
"""Close the USB device handle."""
@ -534,25 +103,3 @@ class Pdq(PdqBase):
def flush(self):
"""Flush pending data."""
self.dev.flush()
class PdqSPI(PdqBase):
def __init__(self, dev=None, **kwargs):
"""Initialize PDQ SPI device stack."""
self.dev = dev
PdqBase.__init__(self, **kwargs)
def write(self, data):
"""Write data to the PDQ board over USB/parallel.
SOF/EOF control sequences are appended/prepended to
the (escaped) data. The running checksum is updated.
Args:
data (bytes): Data to write.
"""
logger.debug("> %r", data)
written = self.dev.write(data)
if isinstance(written, int):
assert written == len(data), (written, len(data))
self.checksum = crc8(data, self.checksum)

31
artiq/devices/pdq/mediator.py
View File

@ -1,8 +1,7 @@
from artiq.language import *
frame_setup = 20*ns
trigger_duration = 50*ns
frame_setup = 1.5*us
sample_period = 10*ns
delay_margin_factor = 1 + 1e-4
@ -117,7 +116,7 @@ class _Frame:
r += segment_program
return r
@kernel
@portable
def advance(self):
if self.invalidated:
raise InvalidatedError()
@ -137,9 +136,7 @@ class _Frame:
self.pdq.current_frame = self.frame_number
self.pdq.next_segment = 0
at_mu(trigger_start_t - self.core.seconds_to_mu(frame_setup))
self.pdq.frame0.set_o(bool(self.frame_number & 1))
self.pdq.frame1.set_o(bool((self.frame_number & 2) >> 1))
self.pdq.frame2.set_o(bool((self.frame_number & 4) >> 2))
self.pdq.write_frame(self.frame_number)
at_mu(trigger_start_t)
self.pdq.trigger.pulse(trigger_duration)
@ -155,30 +152,34 @@ class _Frame:
class CompoundPDQ:
def __init__(self, dmgr, pdq_devices, trigger_device, frame_devices):
def __init__(self, dmgr, pdq_devices, trigger_device,
aux_miso=0, aux_dac=0b111, clk2x=0):
self.core = dmgr.get("core")
self.pdqs = [dmgr.get(d) for d in pdq_devices]
self.trigger = dmgr.get(trigger_device)
self.frame0 = dmgr.get(frame_devices[0])
self.frame1 = dmgr.get(frame_devices[1])
self.frame2 = dmgr.get(frame_devices[2])
self.aux_miso = aux_miso
self.aux_dac = aux_dac
self.clk2x = clk2x
self.frames = []
self.current_frame = -1
self.next_segment = -1
self.armed = False
@portable
def disarm(self):
for frame in self.frames:
frame._invalidate()
self.frames.clear()
for dev in self.pdqs:
dev.park()
dev.write_config(reset=0, clk2x=self.clk2x, enable=0, trigger=0,
aux_miso=self.aux_miso, aux_dac=self.aux_dac, board=0xf)
self.armed = False
def get_program(self):
return [f._get_program() for f in self.frames]
@portable
def arm(self):
if self.armed:
raise ArmError()
@ -204,7 +205,8 @@ class CompoundPDQ:
pdq.program(program)
n += dn
for pdq in self.pdqs:
pdq.unpark()
dev.write_config(reset=0, clk2x=self.clk2x, enable=1, trigger=0,
aux_miso=self.aux_miso, aux_dac=self.aux_dac, board=0xf)
self.armed = True
def create_frame(self):
@ -213,3 +215,8 @@ class CompoundPDQ:
r = _Frame(self, len(self.frames))
self.frames.append(r)
return r
@kernel
def write_frame(self, frame):
for pdq in self.pdqs:
pdq.write_frame(self.frame_number)

446
artiq/devices/pdq/protocol.py Normal file
View File

@ -0,0 +1,446 @@
from math import log, sqrt
import logging
import struct
import serial
from artiq.wavesynth.coefficients import discrete_compensate
from artiq.language.core import portable
logger = logging.getLogger(__name__)
class Segment:
"""Serialize the lines for a single Segment.
Attributes:
max_time (int): Maximum duration of a line.
max_val (int): Maximum absolute value (scale) of the DAC output.
max_out (float): Output voltage at :attr:`max_val`. In Volt.
out_scale (float): Steps per Volt.
cordic_gain (float): CORDIC amplitude gain.
addr (int): Address assigned to this segment.
data (bytes): Serialized segment data.
"""
max_time = 1 << 16 # uint16 timer
max_val = 1 << 15 # int16 DAC
max_out = 10. # Volt
out_scale = max_val/max_out
cordic_gain = 1.
for i in range(16):
cordic_gain *= sqrt(1 + 2**(-2*i))
def __init__(self):
self.data = b""
self.addr = None
def line(self, typ, duration, data, trigger=False, silence=False,
aux=False, shift=0, jump=False, clear=False, wait=False):
"""Append a line to this segment.
Args:
typ (int): Output module to target with this line.
duration (int): Duration of the line in units of
``clock_period*2**shift``.
data (bytes): Opaque data for the output module.
trigger (bool): Wait for trigger assertion before executing
this line.
silence (bool): Disable DAC clocks for the duration of this line.
aux (bool): Assert the AUX (F5 TTL) output during this line.
The corresponding global AUX routing setting determines which
channels control AUX.
shift (int): Duration and spline evolution exponent.
jump (bool): Return to the frame address table after this line.
clear (bool): Clear the DDS phase accumulator when starting to
exectute this line.
wait (bool): Wait for trigger assertion before executing the next
line.
"""
assert len(data) % 2 == 0, data
assert len(data)//2 <= 14
# assert dt*(1 << shift) > 1 + len(data)//2
header = (
1 + len(data)//2 | (typ << 4) | (trigger << 6) | (silence << 7) |
(aux << 8) | (shift << 9) | (jump << 13) | (clear << 14) |
(wait << 15)
)
self.data += struct.pack("<HH", header, duration) + data
@staticmethod
def pack(widths, values):
"""Pack spline data.
Args:
widths (list[int]): Widths of values in multiples of 16 bits.
values (list[int]): Values to pack.
Returns:
data (bytes): Packed data.
"""
fmt = "<"
ud = []
for width, value in zip(widths, values):
value = int(round(value * (1 << 16*width)))
if width == 2:
ud.append(value & 0xffff)
fmt += "H"
value >>= 16
width -= 1
ud.append(value)
fmt += "hi"[width]
try:
return struct.pack(fmt, *ud)
except struct.error as e:
logger.error("can not pack %s as %s (%s as %s): %s",
values, widths, ud, fmt, e)
raise e
def bias(self, amplitude=[], **kwargs):
"""Append a bias line to this segment.
Args:
amplitude (list[float]): Amplitude coefficients in in Volts and
increasing powers of ``1/(2**shift*clock_period)``.
Discrete time compensation will be applied.
**kwargs: Passed to :meth:`line`.
"""
coef = [self.out_scale*a for a in amplitude]
discrete_compensate(coef)
data = self.pack([0, 1, 2, 2], coef)
self.line(typ=0, data=data, **kwargs)
def dds(self, amplitude=[], phase=[], **kwargs):
"""Append a DDS line to this segment.
Args:
amplitude (list[float]): Amplitude coefficients in in Volts and
increasing powers of ``1/(2**shift*clock_period)``.
Discrete time compensation and CORDIC gain compensation
will be applied by this method.
phase (list[float]): Phase/frequency/chirp coefficients.
``phase[0]`` in ``turns``,
``phase[1]`` in ``turns/clock_period``,
``phase[2]`` in ``turns/(clock_period**2*2**shift)``.
**kwargs: Passed to :meth:`line`.
"""
scale = self.out_scale/self.cordic_gain
coef = [scale*a for a in amplitude]
discrete_compensate(coef)
if phase:
assert len(amplitude) == 4
coef += [p*self.max_val*2 for p in phase]
data = self.pack([0, 1, 2, 2, 0, 1, 1], coef)
self.line(typ=1, data=data, **kwargs)
class Channel:
"""PDQ Channel.
Attributes:
num_frames (int): Number of frames supported.
max_data (int): Number of 16 bit data words per channel.
segments (list[Segment]): Segments added to this channel.
"""
def __init__(self, max_data, num_frames):
self.max_data = max_data
self.num_frames = num_frames
self.segments = []
def clear(self):
"""Remove all segments."""
self.segments.clear()
def new_segment(self):
"""Create and attach a new :class:`Segment` to this channel.
Returns:
:class:`Segment`
"""
segment = Segment()
self.segments.append(segment)
return segment
def place(self):
"""Place segments contiguously.
Assign segment start addresses and determine length of data.
Returns:
addr (int): Amount of memory in use on this channel.
"""
addr = self.num_frames
for segment in self.segments:
segment.addr = addr
addr += len(segment.data)//2
assert addr <= self.max_data, addr
return addr
def table(self, entry=None):
"""Generate the frame address table.
Unused frame indices are assigned the zero address in the frame address
table.
This will cause the memory parser to remain in the frame address table
until another frame is selected.
The frame entry segments can be any segments in the channel.
Args:
entry (list[Segment]): List of initial segments for each frame.
If not specified, the first :attr:`num_frames` segments are
used as frame entry points.
Returns:
table (bytes): Frame address table.
"""
table = [0] * self.num_frames
if entry is None:
entry = self.segments
for i, frame in enumerate(entry):
if frame is not None:
table[i] = frame.addr
return struct.pack("<" + "H"*self.num_frames, *table)
def serialize(self, entry=None):
"""Serialize the memory for this channel.
Places the segments contiguously in memory after the frame table.
Allocates and assigns segment and frame table addresses.
Serializes segment data and prepends frame address table.
Args:
entry (list[Segment]): See :meth:`table`.
Returns:
data (bytes): Channel memory data.
"""
self.place()
data = b"".join([segment.data for segment in self.segments])
return self.table(entry) + data
@portable
def PDQ_CMD(board, is_mem, adr, we):
"""Pack PDQ command fields into command byte.
:param board: Board address, 0 to 15, with ``15 = 0xf`` denoting broadcast
to all boards connected.
:param is_mem: If ``1``, ``adr`` denote the address of the memory to access
(0 to 2). Otherwise ``adr`` denotes the register to access.
:param adr: Address of the register or memory to access.
(``PDQ_ADR_CONFIG``, ``PDQ_ADR_FRAME``, ``PDQ_ADR_CRC``).
:param we: If ``1`` then write, otherwise read.
"""
return (adr << 0) | (is_mem << 2) | (board << 3) | (we << 7)
PDQ_ADR_CONFIG = 0
PDQ_ADR_CRC = 1
PDQ_ADR_FRAME = 2
class PDQBase:
"""
PDQ stack.
Attributes:
checksum (int): Running checksum of data written.
num_channels (int): Number of channels in this stack.
num_boards (int): Number of boards in this stack.
num_dacs (int): Number of DAC outputs per board.
num_frames (int): Number of frames supported.
channels (list[Channel]): List of :class:`Channel` in this stack.
"""
freq = 50e6
_mem_sizes = [None, (20,), (10, 10), (8, 6, 6)] # 10kx16 units
def __init__(self, num_boards=3, num_dacs=3, num_frames=32):
"""Initialize PDQ stack.
Args:
num_boards (int): Number of boards in this stack.
num_dacs (int): Number of DAC outputs per board.
num_frames (int): Number of frames supported.
"""
self.checksum = 0
self.num_boards = num_boards
self.num_dacs = num_dacs
self.num_frames = num_frames
self.num_channels = self.num_dacs * self.num_boards
m = self._mem_sizes[num_dacs]
self.channels = [Channel(m[j] << 11, num_frames)
for i in range(num_boards)
for j in range(num_dacs)]
@portable
def get_num_boards(self):
return self.num_boards
@portable
def get_num_channels(self):
return self.num_channels
@portable
def get_num_frames(self):
return self.num_frames
def get_freq(self):
return self.freq
def set_freq(self, freq):
self.freq = float(freq)
@portable
def write_reg(self, adr, data, board):
raise NotImplementedError
@portable
def read_reg(self, adr, board):
raise NotImplementedError
@portable
def write_mem(self, mem, adr, data, board=0xf):
raise NotImplementedError
@portable
def read_mem(self, mem, adr, data, board=0xf, buffer=8):
raise NotImplementedError
@portable
def write_config(self, reset=0, clk2x=0, enable=1,
trigger=0, aux_miso=0, aux_dac=0b111, board=0xf):
"""Set the configuration register.
Args:
reset (bool): Reset the board. Memory is not reset. Self-clearing.
clk2x (bool): Enable the clock multiplier (100 MHz instead of 50
MHz)
enable (bool): Enable the reading and execution of waveform data
from memory.
trigger (bool): Soft trigger. Logical or with the ``F1 TTL Input``
hardware trigger.
aux_miso (bool): Drive SPI MISO on the AUX/``F5 OUT`` TTL port of
each board. If ``False``/``0``, drive the masked logical OR of
the DAC channels' aux data.
aux_dac (int): DAC channel mask for AUX/F5. Each bit represents
one channel. AUX/F5 is: ``aux_miso ? spi_miso :
(aux_dac & Cat(_.aux for _ in channels) != 0)``
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
config = ((reset << 0) | (clk2x << 1) | (enable << 2) |
(trigger << 3) | (aux_miso << 4) | (aux_dac << 5))
self.write_reg(PDQ_ADR_CONFIG, config, board)
@portable
def read_config(self, board=0xf):
"""Read configuration register.
.. seealso: :meth:`write_config`
"""
return self.read_reg(PDQ_ADR_CONFIG, board)
@portable
def write_crc(self, crc=0, board=0xf):
"""Set/reset the checksum register.
Args:
crc (int): Checksum value to write.
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
self.write_reg(PDQ_ADR_CRC, crc, board)
@portable
def read_crc(self, board=0xf):
"""Read checksum register.
.. seealso:: :meth:`write_crc`
"""
return self.read_reg(PDQ_ADR_CRC, board)
@portable
def write_frame(self, frame, board=0xf):
"""Set the current frame.
Args:
frame (int): Frame to select.
board (int): Board to write to (0-0xe), 0xf for all boards.
"""
self.write_reg(PDQ_ADR_FRAME, frame, board)
@portable
def read_frame(self, board=0xf):
"""Read frame selection register.
.. seealso:: :meth:`write_frame`
"""
return self.read_reg(PDQ_ADR_FRAME, board)
def program_segments(self, segments, data):
"""Append the wavesynth lines to the given segments.
Args:
segments (list[Segment]): List of :class:`Segment` to append the
lines to.
data (list): List of wavesynth lines.
"""
for i, line in enumerate(data):
dac_divider = line.get("dac_divider", 1)
shift = int(log(dac_divider, 2))
if 2**shift != dac_divider:
raise ValueError("only power-of-two dac_dividers supported")
duration = line["duration"]
trigger = line.get("trigger", False)
for segment, data in zip(segments, line["channel_data"]):
silence = data.pop("silence", False)
if len(data) != 1:
raise ValueError("only one target per channel and line "
"supported")
for target, target_data in data.items():
getattr(segment, target)(
shift=shift, duration=duration, trigger=trigger,
silence=silence, **target_data)
def program(self, program, channels=None):
"""Serialize a wavesynth program and write it to the channels
in the stack.
The :class:`Channel` targeted are cleared and each frame in the
wavesynth program is appended to a fresh set of :class:`Segment`
of the channels. All segments are allocated, the frame address tale
is generated, the channels are serialized and their memories are
written.
Short single-cycle lines are prepended and appended to each frame to
allow proper write interlocking and to assure that the memory reader
can be reliably parked in the frame address table.
The first line of each frame is mandatorily triggered.
Args:
program (list): Wavesynth program to serialize.
channels (list[int]): Channel indices to use. If unspecified, all
channels are used.
"""
if channels is None:
channels = range(self.num_channels)
chs = [self.channels[i] for i in channels]
for channel in chs:
channel.clear()
for frame in program:
segments = [c.new_segment() for c in chs]
self.program_segments(segments, frame)
# append an empty line to stall the memory reader before jumping
# through the frame table (`wait` does not prevent reading
# the next line)
for segment in segments:
segment.line(typ=3, data=b"", trigger=True, duration=1, aux=1,
jump=True)
for channel, ch in zip(channels, chs):
self.write_mem(channel, ch.serialize())
def ping(self):
"""Ping method returning True. Required for ARTIQ remote
controller."""
return True

12
artiq/frontend/aqctl_pdq.py
View File

@ -4,13 +4,15 @@ import argparse
import sys
import time
from artiq.devices.pdq.driver import Pdq
from artiq.devices.pdq.driver import PDQ
from artiq.protocols.pc_rpc import simple_server_loop
from artiq.tools import *
def get_argparser():
parser = argparse.ArgumentParser(description="PDQ controller")
parser = argparse.ArgumentParser(description="""PDQ controller.
Use this controller for PDQ stacks that are connected via USB.""")
simple_network_args(parser, 3252)
parser.add_argument("-d", "--device", default=None, help="serial port")
parser.add_argument("--simulation", action="store_true",
@ -37,14 +39,14 @@ def main():
if args.simulation:
port = open(args.dump, "wb")
dev = Pdq(url=args.device, dev=port, num_boards=args.boards)
dev = PDQ(url=args.device, dev=port, num_boards=args.boards)
try:
if args.reset:
dev.write(b"") # flush eop
dev.set_config(reset=True)
dev.write_config(reset=True)
time.sleep(.1)
dev.set_checksum(0)
dev.write_crc(0)
dev.checksum = 0
simple_server_loop({"pdq": dev}, bind_address_from_args(args),

16
artiq/test/test_pdq.py
View File

@ -4,7 +4,7 @@ import unittest
import os
import io
from artiq.devices.pdq.driver import Pdq
from artiq.devices.pdq.driver import PDQ
from artiq.wavesynth.compute_samples import Synthesizer
@ -13,11 +13,11 @@ pdq_gateware = os.getenv("ARTIQ_PDQ_GATEWARE")
class TestPdq(unittest.TestCase):
def setUp(self):
self.dev = Pdq(dev=io.BytesIO())
self.dev = PDQ(dev=io.BytesIO())
self.synth = Synthesizer(3, _test_program)
def test_reset(self):
self.dev.set_config(reset=True)
self.dev.write_config(reset=True)
buf = self.dev.dev.getvalue()
self.assertEqual(buf, b"\xa5\x02\xf8\xe5\xa5\x03")
@ -26,9 +26,9 @@ class TestPdq(unittest.TestCase):
self.dev.program(_test_program)
def test_cmd_program(self):
self.dev.set_config(enable=False)
self.dev.write_config(enable=False)
self.dev.program(_test_program)
self.dev.set_config(enable=True, trigger=True)
self.dev.write_config(enable=True, trigger=True)
return self.dev.dev.getvalue()
def test_synth(self):
@ -43,10 +43,14 @@ class TestPdq(unittest.TestCase):
from gateware.pdq import PdqSim
from migen import run_simulation
def ncycles(n):
for i in range(n):
yield
buf = self.test_cmd_program()
tb = PdqSim()
tb.ctrl_pads.trigger.reset = 1
run_simulation(tb, ncycles=len(buf) + 250)
run_simulation(tb, [ncycles(len(buf) + 250)])
delays = 7, 10, 30
y = list(zip(*tb.outputs[len(buf) + 130:]))
y = list(zip(*(yi[di:] for yi, di in zip(y, delays))))

6
doc/manual/ndsp_reference.rst
View File

@ -11,6 +11,12 @@ Core device logging controller
PDQ2
----
Protocol
++++++++
.. automodule:: artiq.devices.pdq.protocol
:members:
Driver
++++++