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pdq2: merge from main pdq2 repo

This commit is contained in:
Robert Jördens 2015-03-19 14:34:37 -06:00
parent fdca0a71ff
commit fae7246f30
1 changed files with 230 additions and 290 deletions

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@ -1,324 +1,264 @@
# Based on code by Robert Jordens <jordens@gmail.com>, 2012
# Robert Jordens <jordens@gmail.com>, 2012-2015
import logging
import struct
import warnings
from scipy import interpolate
import numpy as np
from scipy import interpolate
import serial
logger = logging.getLogger(__name__)
logger = logging.getLogger("pdq2")
class Segment:
def __init__(self):
self.data = b""
Ftdi = None
def line(self, typ, dt, data, trigger=False, silence=False,
aux=False, shift=0, end=False, clear=False, wait=False):
assert len(data) % 2 == 0, data
assert len(data)//2 <= 14
#assert dt*(1 << shift) > 1 + len(data)//2
head = (
1 + len(data)//2 | (typ << 4) | (trigger << 6) | (silence << 7) |
(aux << 8) | (shift << 9) | (end << 13) | (clear << 14) |
(wait << 15)
)
self.data += struct.pack("<HH", head, dt) + data
@staticmethod
def pack(widths, values):
fmt = "<"
ud = []
for width, value in zip(widths, values):
if width == 3:
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("%s as %s: %s", ud, fmt, e)
raise e
def lines(self, typ, dt, widths, v, first={}, mid={}, last={}, shift=0):
n = len(dt) - 1
dt = dt.astype(np.uint16)
v = v.astype(np.int64)
for i, (dti, vi) in enumerate(zip(dt, v)):
opts = mid
if i == 0:
opts = first
elif i == n:
opts = last
data = self.pack(widths, vi)
self.line(typ, dti, data, shift=shift, **opts)
@staticmethod
def interpolate(t, v, order, t_eval, widths=None):
"""Spline interpolating derivatives for t,v.
The returned spline coefficients are one shorter than t
"""
if order == 0:
return np.rint(v[:, None])
# FIXME: does not ensure that interpolates do not clip
s = interpolate.splrep(t, v, k=order)
# FIXME: needs k knots outside t_eval
# dv = np.array(interpolate.spalde(t_eval, s))
dv = np.array([interpolate.splev(t_eval, s, der=i, ext=0)
for i in range(order + 1)]).T
# correct for adder chain latency
if order > 1:
dv[:, 1] += dv[:, 2]/2
if order > 2:
dv[:, 1] += dv[:, 3]/6
dv[:, 2] += dv[:, 3]
if widths is not None:
dv *= 1 << 16*widths
return np.rint(dv)
def line_times(self, t, tr=None):
if tr is None:
tr = np.rint(t)
if len(tr) == 1:
return None, np.array([1])
dt = np.diff(tr)
assert np.all(dt >= 0)
assert np.all(dt < (1 << 16))
return tr[:-1], dt
def dac(self, t, v, first={}, mid={}, last={},
shift=0, tr=None, order=3, stop=True):
widths = np.array([1, 2, 3, 3])
tr, dt = self.line_times(t, tr)
dv = self.interpolate(t, v, order, tr, widths[:order + 1] - 1)
self.lines(0, dt, widths, dv, first, mid, mid if stop else last, shift)
if stop:
self.line(0, 2, self.pack([1], [int(round(v[-1]))]), **last)
def dds(self, t, v, p=None, f=None, first={}, mid={}, last={},
shift=0, tr=None, order=3, stop=True):
widths = np.array([1, 2, 3, 3, 1, 2, 2])
tr, dt = self.line_times(t, tr)
dv = self.interpolate(t, v, order, tr, widths[:order + 1] - 1)
if p is not None:
assert order == 3
dp = self.interpolate(t, p, 1, tr)[:, :1]
dv = np.concatenate((dv, dp), axis=1)
if f is not None:
df = self.interpolate(t, f, 1, tr, widths[-2:] - 1)
dv = np.concatenate((dv, df), axis=1)
self.lines(1, dt, widths, dv, first, mid, mid if stop else last, shift)
if stop:
dv = [int(round(v[-1])), 0, 0, 0]
if p is not None:
dv.append(int(round(p[-1])))
if f is not None:
dv.append(int(round(f[-1])))
self.line(1, 2, self.pack(widths, dv), **last)
try:
import pylibftdi
class Channel:
max_data = 4*(1 << 10) # 8kx16 8kx16 4kx16
num_frames = 8
max_val = 1 << 15 # int16 bit DAC
max_time = 1 << 16 # uint16 bit timer
cordic_gain = 1.
for i in range(16):
cordic_gain *= np.sqrt(1 + 2**(-2*i))
max_out = 10.
freq = 50e6 # samples/s
class PyFtdi:
def __init__(self, serial=None):
self.dev = pylibftdi.Device(device_id=serial)
def __init__(self):
self.segments = []
def write(self, data):
written = self.dev.write(data)
if written < 0:
raise pylibftdi.FtdiError(written,
self.dev.get_error_string())
return written
def clear(self):
del self.segments[:]
def close(self):
self.dev.close()
del self.dev
def new_segment(self):
# assert len(self.segments) < self.num_frames
segment = Segment()
self.segments.append(segment)
return segment
Ftdi = PyFtdi
except ImportError:
pass
def segment(self, t, v, p=None, f=None,
order=3, aux=False, shift=0, trigger=True, end=True,
silence=False, stop=True, clear=True, wait=False):
segment = self.new_segment()
t = t*(self.freq/2**shift)
v = np.clip(v/self.max_out, -1, 1)
order = min(order, len(t) - 1)
first = dict(trigger=trigger, clear=clear, aux=aux)
mid = dict(aux=aux)
last = dict(silence=silence, end=end, wait=wait, aux=aux)
if p is None:
v = v*self.max_val
segment.dac(t, v, first, mid, last, shift=shift, order=order,
stop=stop)
else:
v = v*(self.max_val/self.cordic_gain)
p = p*(self.max_val/np.pi)
if f is not None:
f = f*(self.max_val/self.freq)
segment.dds(t, v, p, f, first, mid, last, shift=shift,
order=order, stop=stop)
return segment
def place(self):
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
try:
import ftd2xx
def table(self, entry=None):
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)
class D2xxFtdi:
def __init__(self, serial=None):
if serial is not None:
self.dev = ftd2xx.openEx(serial)
else:
self.dev = ftd2xx.open()
self.dev.setTimeouts(read=5000, write=5000)
def write(self, data):
written = self.dev.write(str(data))
return written
def close(self):
self.dev.close()
del self.dev
Ftdi = D2xxFtdi
except ImportError:
pass
if Ftdi is None:
class FileFtdi:
def __init__(self, serial="unknown"):
self.fil = open("pdq_%s_ftdi.bin" % serial, "wb")
def write(self, data):
self.fil.write(data)
return len(data)
def close(self):
self.fil.close()
del self.fil
logger.warning("no ftdi library found. writing to files")
Ftdi = FileFtdi
def serialize(self, entry=None):
self.place()
data = b"".join([segment.data for segment in self.segments])
return self.table(entry) + data
class Pdq2:
"""
PDQ DAC (a.k.a. QC_Waveform)
"""
num_dacs = 3
num_boards = 3
num_channels = num_dacs*num_boards
commands = {
"RESET_EN": b"\x00",
"RESET_DIS": b"\x01",
"TRIGGER_EN": b"\x02",
"TRIGGER_DIS": b"\x03",
"ARM_EN": b"\x04",
"ARM_DIS": b"\x05",
"DCM_EN": b"\x06",
"DCM_DIS": b"\x07",
"START_EN": b"\x08",
"START_DIS": b"\x09",
}
_escape = b"\xa5"
_commands = "RESET TRIGGER ARM DCM START".split()
def __init__(self, serial=None):
self.serial = serial
self.dev = Ftdi(serial)
def __init__(self, url=None, dev=None):
if dev is None:
dev = serial.serial_for_url(url)
self.dev = dev
self.channels = [Channel() for i in range(self.num_channels)]
self.set_freq()
def init(self):
self.max_val = 1 << 15 # signed 16 bit DAC
self.max_out = 10.
self.freq = 50e6 # samples/s
self.max_time = 1 << 16 # unsigned 16 bit timer
self.num_dacs = 3
self.num_frames = 8
self.num_channels = 9
self.max_data = 4*(1 << 10) # 8kx16 8kx16 4kx16
self.escape_char = b"\xa5"
self.cordic_gain = 1.
for i in range(16):
self.cordic_gain *= np.sqrt(1 + 2**(-2*i))
def set_freq(self, f=50e6):
for c in self.channels:
c.freq = f
def close(self):
self.dev.close()
del self.dev
def set_freq(self, f):
self.freq = f
def write(self, data):
logger.debug("> %r", data)
written = self.dev.write(data)
if isinstance(written, int):
assert written == len(data)
def get_freq(self):
return self.freq
def cmd(self, cmd, enable):
cmd = self._commands.index(cmd) << 1
if not enable:
cmd |= 1
self.write(struct.pack("cb", self._escape, cmd))
def get_num_channels(self):
return self.num_channels
def get_num_frames(self):
return self.num_frames
def get_max_out(self):
return self.max_out
def _cmd(self, cmd):
return self.escape_char + self.commands[cmd]
def _escape(self, data):
return data.replace(self.escape_char,
self.escape_char + self.escape_char)
def _write(self, *segments):
"""
writes data segments to device
"""
for segment in segments:
written = self.dev.write(segment)
if written != len(segment):
raise IOError("wrote %i of %i" % (written, len(segment)))
def flush_escape(self):
self._write(b"\x00")
def write_cmd(self, cmd):
return self._write(self._cmd(cmd))
def _write_data(self, *segments):
return self._write(*(self._escape(seg) for seg in segments))
def _line_times(self, t, shift=0):
scale = self.freq/2**shift
t = t*scale
tr = np.rint(t)
dt = np.diff(tr)
return t, tr, dt
def _interpolate(self, t, v, order, shift=0, tr=None):
"""
calculate spline interpolation derivatives for data
according to interpolation order
also differentiates times (implicitly shifts to 0) and removes
the last value (irrelevant since the frame ends here)
"""
if order == 0:
return [v[:-1]]
spline = interpolate.splrep(t, v, k=order)
if tr is None:
tr = t
dv = [interpolate.splev(tr[:-1], spline, der=i)
for i in range(order + 1)]
# correct for adder chain latency
correction_map = [
(1, -1/2., 2),
(1, -1/6., 3),
(2, -1., 3),
]
for i, c, j in correction_map:
if j >= len(dv):
break
dv[i] -= c*dv[j]
return dv
def _pack_frame(self, *parts_dtypes):
frame = []
for part, dtype in parts_dtypes:
if dtype == "i6":
part = part.astype("<i8")
frame.append(part.astype("<i4"))
frame.append((part >> 32).astype("<i2"))
else:
frame.append(part.astype("<" + dtype))
frame = np.rec.fromarrays(frame) # interleave
logger.debug("frame %s dtype %s shape %s length %s",
frame, frame.dtype, frame.shape, len(bytes(frame.data)))
return bytes(frame.data)
def _frame(self, t, v, p=None, f=None,
order=3, aux=None, shift=0, trigger=True, end=True,
silence=False, stop=True, clear=True, wait=False):
"""
serialize frame data
voltages in volts, times in seconds
"""
words = [1, 2, 3, 3, 1, 2, 2]
n = order + 1
if f is not None:
n += 2
if p is None:
p = np.zeros_like(f)
if p is not None:
n += 1
length = 1 + sum(words[:n])
parts = []
head = np.zeros(len(t) - 1, "<u2")
head[:] |= length # 4
if p is not None:
head[:] |= 1 << 4 # typ # 2
head[0] |= trigger << 6 # 1
head[-1] |= (not stop and silence) << 7 # 1
if aux is not None:
head[:] |= aux[:len(head)] << 8 # 1
head[:] |= shift << 9 # 4
head[-1] |= (not stop and end) << 13 # 1
head[0] |= clear << 14 # 1
head[-1] |= (not stop and wait) << 15 # 1
parts.append((head, "u2"))
t, tr, dt = self._line_times(t, shift)
assert np.all(dt*2**shift > 1 + length), (dt, length)
assert np.all(dt < self.max_time), dt
parts.append((dt, "u2"))
v = np.clip(v/self.max_out, -1, 1)
if p is not None:
v /= self.cordic_gain
for dv, w in zip(self._interpolate(t, v, order, shift, tr), words):
parts.append((np.rint(dv*(2**(16*w - 1))), "i%i" % (2*w)))
if p is not None:
p = p/(2*np.pi)
for dv, w in zip(self._interpolate(t, p, 0, shift, tr), [1]):
parts.append((np.rint(dv*(2**(16*w))), "u%i" % (2*w)))
if f is not None:
f = f/self.freq
for dv, w in zip(self._interpolate(t, f, 1, shift, tr), [2, 2]):
parts.append((np.rint(dv*(2**(16*w))), "i%i" % (2*w)))
frame = self._pack_frame(*parts)
if stop:
if p is not None:
frame += struct.pack("<HH hiihih H ii", (15 << 0) | (1 << 4) |
(silence << 7) |
(end << 13) |
(wait << 15),
1, int(v[-1]*2**15), 0, 0, 0, 0, 0,
int(p[-1]*2**16), int(f[-1]*2**31), 0)
else:
frame += struct.pack("<HH h", (2 << 0) | (silence << 7) |
(end << 13) | (wait << 15),
1, int(v[-1]*2**15))
return frame
def _line(self, dt, v=(), a=(), p=(), f=(), typ=0,
silence=False, end=False, trigger=False, aux=False,
clear=False):
raise NotImplementedError
fmt = "<HH"
parts = [0, int(round(dt*self.freq))]
for vi, wi in zip(v, [1, 2, 3, 3]):
vi = int(round(vi*(2**(16*wi - 1))))
if wi == 3:
fmt += "Ih"
parts += [vi & 0xffffffff, vi >> 32]
else:
fmt += "bih"[wi]
parts += [vi]
if p is not None:
typ = 1
def _map_frames(self, frames, map=None):
table = []
adr = self.num_frames
for frame in frames:
table.append(adr)
adr += len(frame)//2
assert adr <= self.max_data, adr
t = []
for i in range(self.num_frames):
if map is not None and len(map) > i:
i = map[i]
if i is not None and len(table) > i:
i = table[i]
else:
i = 0
t.append(i)
t = struct.pack("<" + "H"*self.num_frames, *t)
return t + b"".join(frames)
def _add_mem_header(self, board, dac, data, adr=0):
assert dac in range(self.num_dacs)
head = struct.pack("<HHH", (board << 4) | dac,
adr, adr + len(data)//2 - 1)
return head + data
def multi_frame(self, times_voltages, channel, map=None, **kwargs):
frames = [self._frame(t, v, **kwargs) for t, v in times_voltages]
data = self._map_frames(frames, map)
def write_mem(self, channel, data, start_addr=0):
board, dac = divmod(channel, self.num_dacs)
data = self._add_mem_header(board, dac, data)
self._write_data(data)
data = struct.pack("<HHH", (board << 4) | dac, start_addr,
start_addr + len(data)//2 - 1) + data
data = data.replace(self._escape, self._escape + self._escape)
self.write(data)
def write_channel(self, channel, entry=None):
self.write_mem(self.channels.index(channel),
channel.serialize(entry))
def write_all(self):
for channel in self.channels:
self.write_mem(self.channels.index(channel),
channel.serialize())
def write_table(self, channel, segments=None):
# no segment placement
# no segment writing
self.write_mem(channel, self.channels[channel].table(segments))
def write_segment(self, channel, segment):
# no collision check
s = self.channels[channel].segments[segment]
self.write_mem(channel, s.data, s.adr)
def multi_segment(self, times_voltages, channel, map=None, **kwargs):
warnings.warn("deprecated", DeprecationWarning)
c = self.channels[channel]
del c.segments[:]
for t, v in times_voltages:
c.segment(t, v, **kwargs)
return c.serialize(map)