forked from M-Labs/artiq
artiq/devices: add pdq2.py
This commit is contained in:
parent
5e994071ce
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de158e0aeb
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#!/usr/bin/python
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# -*- coding: utf8 -*-
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#
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# Robert Jordens <jordens@gmail.com>, 2012
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import logging, struct
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import numpy as np
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from scipy import interpolate
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import warnings
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logger = logging.getLogger("Pdq2")
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Ftdi = None
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try:
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import pylibftdi
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class PyFtdi:
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def __init__(self, serial=None):
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self.dev = pylibftdi.Device(device_id=serial)
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def write(self, data):
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written = self.dev.write(data)
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if written < 0:
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raise pylibftdi.FtdiError(written,
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self.dev.get_error_string())
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return written
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def close(self):
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self.dev.close()
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del self.dev
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Ftdi = PyFtdi
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except ImportError:
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pass
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try:
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import ftd2xx
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class D2xxFtdi:
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def __init__(self, serial=None):
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if serial is not None:
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self.dev = ftd2xx.openEx(serial)
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else:
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self.dev = ftd2xx.open()
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self.dev.setTimeouts(read=5000, write=5000)
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def write(self, data):
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written = self.dev.write(str(data))
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return written
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def close(self):
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self.dev.close()
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del self.dev
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Ftdi = D2xxFtdi
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except ImportError:
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pass
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if Ftdi is None:
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class FileFtdi:
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def __init__(self, serial="unknown"):
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self.fil = open("pdq_%s_ftdi.bin" % serial, "wb")
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def write(self, data):
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self.fil.write(data)
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return len(data)
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def close(self):
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self.fil.close()
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del self.fil
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warnings.warn("no ftdi library found. writing to files")
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Ftdi = FileFtdi
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class Pdq2:
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"""
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PDQ DAC (a.k.a. QC_Waveform)
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"""
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max_val = 1<<15 # signed 16 bit DAC
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max_out = 10.
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freq = 50e6 # samples/s
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max_time = 1<<16 # unsigned 16 bit timer
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num_dacs = 3
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num_frames = 8
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num_channels = 9
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max_data = 4*(1<<10) # 8kx16 8kx16 4kx16
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escape_char = b"\xa5"
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cordic_gain = 1.
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for i in range(16):
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cordic_gain *= np.sqrt(1 + 2**(-2*i))
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commands = {
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"RESET_EN": b"\x00",
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"RESET_DIS": b"\x01",
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"TRIGGER_EN": b"\x02",
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"TRIGGER_DIS": b"\x03",
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"ARM_EN": b"\x04",
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"ARM_DIS": b"\x05",
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"DCM_EN": b"\x06",
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"DCM_DIS": b"\x07",
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"START_EN": b"\x08",
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"START_DIS": b"\x09",
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}
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def __init__(self, serial=None):
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self.serial = serial
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self.dev = Ftdi(serial)
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def close(self):
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self.dev.close()
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del self.dev
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def cmd(self, cmd):
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return self.escape_char + self.commands[cmd]
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def write_cmd(self, cmd):
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return self.write(self.cmd(cmd))
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def escape(self, data):
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return data.replace(self.escape_char, self.escape_char +
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self.escape_char)
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def write(self, *segments):
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"""
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writes data segments to device
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"""
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for segment in segments:
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written = self.dev.write(segment)
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if written != len(segment):
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raise IOError("wrote %i of %i" % (written, len(segment)))
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def write_data(self, *segments):
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return self.write(*(self.escape(seg) for seg in segments))
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def line_times(self, t, shift=0):
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scale = self.freq/2**shift
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t = t*scale
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tr = np.rint(t)
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dt = np.diff(tr)
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return t, tr, dt
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def interpolate(self, t, v, order, shift=0, tr=None):
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"""
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calculate spline interpolation derivatives for data
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according to interpolation order
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also differentiates times (implicitly shifts to 0) and removes
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the last value (irrelevant since the frame ends here)
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"""
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if order == 0:
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return [v[:-1]]
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spline = interpolate.splrep(t, v, k=order)
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if tr is None:
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tr = t
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dv = [interpolate.splev(tr[:-1], spline, der=i)
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for i in range(order + 1)]
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# correct for adder chain latency
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correction_map = [
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(1, -1/2., 2),
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(1, -1/6., 3),
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(2, -1., 3),
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]
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for i, c, j in correction_map:
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if j >= len(dv):
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break
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dv[i] -= c*dv[j]
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return dv
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def pack_frame(self, *parts_dtypes):
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frame = []
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for part, dtype in parts_dtypes:
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if dtype == "i6":
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part = part.astype("<i8")
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frame.append(part.astype("<i4"))
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frame.append((part >> 32).astype("<i2"))
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else:
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frame.append(part.astype("<" + dtype))
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frame = np.rec.fromarrays(frame) # interleave
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logger.debug("frame %s dtype %s shape %s length %s",
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frame, frame.dtype, frame.shape, len(bytes(frame.data)))
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return bytes(frame.data)
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def frame(self, t, v, p=None, f=None,
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order=3, aux=None, shift=0, trigger=True, end=True,
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silence=False, stop=True, clear=True, wait=False):
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"""
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serialize frame data
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voltages in volts, times in seconds
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"""
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words = [1, 2, 3, 3, 1, 2, 2]
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n = order + 1
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if f is not None:
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n += 2
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if p is None:
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p = np.zeros_like(f)
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if p is not None:
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n += 1
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length = 1 + sum(words[:n])
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parts = []
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head = np.zeros(len(t) - 1, "<u2")
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head[:] |= length # 4
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if p is not None:
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head[:] |= 1<<4 # typ # 2
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head[0] |= trigger<<6 # 1
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head[-1] |= (not stop and silence)<<7 # 1
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if aux is not None:
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head[:] |= aux[:len(head)]<<8 # 1
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head[:] |= shift<<9 # 4
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head[-1] |= (not stop and end)<<13 # 1
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head[0] |= clear<<14 # 1
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head[-1] |= (not stop and wait)<<15 # 1
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parts.append((head, "u2"))
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t, tr, dt = self.line_times(t, shift)
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assert np.all(dt*2**shift > 1 + length), (dt, length)
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assert np.all(dt < self.max_time), dt
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parts.append((dt, "u2"))
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v = np.clip(v/self.max_out, -1, 1)
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if p is not None:
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v /= self.cordic_gain
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for dv, w in zip(self.interpolate(t, v, order, shift, tr), words):
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parts.append((np.rint(dv*(2**(16*w - 1))), "i%i" % (2*w)))
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if p is not None:
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p = p/(2*np.pi)
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for dv, w in zip(self.interpolate(t, p, 0, shift, tr), [1]):
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parts.append((np.rint(dv*(2**(16*w))), "u%i" % (2*w)))
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if f is not None:
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f = f/self.freq
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for dv, w in zip(self.interpolate(t, f, 1, shift, tr), [2, 2]):
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parts.append((np.rint(dv*(2**(16*w))), "i%i" % (2*w)))
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frame = self.pack_frame(*parts)
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if stop:
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if p is not None:
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frame += struct.pack("<HH hiihih H ii", (15<<0) | (1<<4) |
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(silence<<7) | (end<<13) | (wait<<15),
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1, int(v[-1]*2**15), 0, 0, 0, 0, 0,
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int(p[-1]*2**16), int(f[-1]*2**31), 0)
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else:
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frame += struct.pack("<HH h", (2<<0) |
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(silence<<7) | (end<<13) | (wait << 15),
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1, int(v[-1]*2**15))
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return frame
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def line(self, dt, v=(), a=(), p=(), f=(), typ=0,
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silence=False, end=False, trigger=False, aux=False,
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clear=False):
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raise NotImplementedError
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fmt = "<HH"
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parts = [0, int(round(dt*self.freq))]
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for vi, wi in zip(v, [1, 2, 3, 3]):
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vi = int(round(vi*(2**(16*wi - 1))))
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if wi == 3:
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fmt += "Ih"
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parts += [vi & 0xffffffff, vi >> 32]
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else:
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fmt += "bih"[wi]
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parts += [vi]
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if p is not None:
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typ = 1
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def map_frames(self, frames, map=None):
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table = []
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adr = self.num_frames
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for frame in frames:
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table.append(adr)
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adr += len(frame)//2
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assert adr <= self.max_data, adr
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t = []
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for i in range(self.num_frames):
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if map is not None and len(map) > i:
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i = map[i]
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if i is not None and len(table) > i:
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i = table[i]
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else:
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i = 0
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t.append(i)
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t = struct.pack("<" + "H"*self.num_frames, *t)
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return t + b"".join(frames)
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def add_mem_header(self, board, dac, data, adr=0):
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assert dac in range(self.num_dacs)
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head = struct.pack("<HHH", (board << 4) | dac,
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adr, adr + len(data)//2 - 1)
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return head + data
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def multi_frame(self, times_voltages, channel, map=None, **kwargs):
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frames = [self.frame(t, v, **kwargs) for t, v in times_voltages]
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data = self.map_frames(frames, map)
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board, dac = divmod(channel, self.num_dacs)
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data = self.add_mem_header(board, dac, data)
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return data
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def _main():
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import argparse
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import time
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parser = argparse.ArgumentParser(description="""PDQ2 frontend.
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Evaluates times and voltages, interpolates and uploads
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them.""")
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parser.add_argument("-s", "--serial", default=None,
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help="device (FT245R) serial string [first]")
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parser.add_argument("-c", "--channel", default=0, type=int,
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help="channel: 3*board_num+dac_num [%(default)s]")
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parser.add_argument("-f", "--frame", default=0, type=int,
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help="frame [%(default)s]")
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parser.add_argument("-e", "--free", default=False,
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action="store_true",
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help="software trigger [%(default)s]")
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parser.add_argument("-n", "--disarm", default=False,
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action="store_true",
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help="disarm group [%(default)s]")
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parser.add_argument("-t", "--times",
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default="np.arange(5)*1e-6",
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help="sample times (s) [%(default)s]")
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parser.add_argument("-v", "--voltages",
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default="(1-np.cos(t/t[-1]*2*np.pi))/2",
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help="sample voltages (V) [%(default)s]")
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parser.add_argument("-o", "--order", default=3, type=int,
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help="interpolation (0: const, 1: lin, 2: quad, 3: cubic)"
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" [%(default)s]")
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parser.add_argument("-m", "--dcm", default=None, type=int,
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help="choose fast 100MHz clock [%(default)s]")
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parser.add_argument("-x", "--demo", default=False, action="store_true",
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help="demo mode: pulse and chirp, 1V*ch+0.1V*frame [%(default)s]")
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parser.add_argument("-p", "--plot", help="plot to file [%(default)s]")
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parser.add_argument("-d", "--debug", default=False,
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action="store_true", help="debug communications")
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parser.add_argument("-r", "--reset", default=False,
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action="store_true", help="do reset before")
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parser.add_argument("-b", "--bit", default=False,
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action="store_true", help="do bit test")
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args = parser.parse_args()
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if args.debug:
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logging.basicConfig(level=logging.DEBUG)
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else:
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logging.basicConfig(level=logging.WARNING)
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times = eval(args.times, globals(), {})
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voltages = eval(args.voltages, globals(), dict(t=times))
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dev = Pdq2(serial=args.serial)
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if args.reset:
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dev.write(b"\x00") # flush any escape
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dev.write_cmd("RESET_EN")
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time.sleep(.1)
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if args.dcm:
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dev.write_cmd("DCM_EN")
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dev.freq = 100e6
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elif args.dcm == 0:
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dev.write_cmd("DCM_DIS")
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dev.freq = 50e6
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dev.write_cmd("START_DIS")
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if args.demo:
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channels = [args.channel] if args.channel < dev.num_channels \
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else range(dev.num_channels)
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frames = [args.frame] if args.frame < dev.num_frames \
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else range(dev.num_frames)
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for channel in channels:
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f = []
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for frame in frames:
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vi = .1*frame + channel + voltages
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pi = 2*np.pi*(.01*frame + .1*channel + 0*voltages)
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fi = 10e6*times/times[-1]
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f.append(b"".join([
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dev.frame(times, vi, order=args.order, end=False),
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dev.frame(2*times, voltages, pi, fi, trigger=False),
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#dev.frame(2*times, 0*vi+.1, 0*pi, 0*fi+1e6),
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#dev.frame(times, 0*vi, order=args.order, silence=True),
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]))
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board, dac = divmod(channel, dev.num_dacs)
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dev.write_data(dev.add_mem_header(board, dac, dev.map_frames(f)))
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elif args.bit:
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map = [0] * dev.num_frames
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t = np.arange(2*16) * 1.
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v = [-1, 0, -1]
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for i in range(15):
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vi = 1<<i
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v.extend([vi - 1, vi])
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v = np.array(v)*dev.max_out/(1<<15)
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t, v = t[:3], v[:3]
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#print(t, v)
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for channel in range(dev.num_channels):
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dev.write_data(dev.multi_frame([(t, v)], channel=channel,
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order=0, map=map, shift=15, stop=False, trigger=False))
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else:
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tv = [(times, voltages)]
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map = [None] * dev.num_frames
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map[args.frame] = 0
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dev.write_data(dev.multi_frame(tv, channel=args.channel,
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order=args.order, map=map))
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dev.write_cmd("START_EN")
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if not args.disarm:
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dev.write_cmd("ARM_EN")
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if args.free:
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dev.write_cmd("TRIGGER_EN")
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dev.close()
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if args.plot:
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from matplotlib import pyplot as plt
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fig, ax0 = plt.subplots()
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ax0.plot(times, voltages, "xk", label="points")
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if args.order:
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spline = interpolate.splrep(times, voltages, k=args.order)
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ttimes = np.arange(0, times[-1], 1/dev.freq)
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vvoltages = interpolate.splev(ttimes, spline)
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ax0.plot(ttimes, vvoltages, ",b", label="interpolation")
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fig.savefig(args.plot)
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if __name__ == "__main__":
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_main()
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