mirror of
https://github.com/jonathanhogg/scopething
synced 2025-07-14 03:02:09 +01:00
Support for multiple analog params to handle calibrating different kinds of probe; naming convention changes; other random updates
This commit is contained in:
93
scope.py
93
scope.py
@ -13,7 +13,7 @@ import streams
|
||||
import vm
|
||||
|
||||
|
||||
Log = logging.getLogger('scope')
|
||||
LOG = logging.getLogger('scope')
|
||||
|
||||
|
||||
class DotDict(dict):
|
||||
@ -24,7 +24,7 @@ class DotDict(dict):
|
||||
|
||||
class Scope(vm.VirtualMachine):
|
||||
|
||||
AnalogParams = namedtuple('AnalogParams', ['rd', 'rr', 'rt', 'rb', 'scale', 'offset'])
|
||||
AnalogParams = namedtuple('AnalogParams', ['rd', 'rr', 'rt', 'rb', 'scale', 'offset', 'safe_high', 'safe_low', 'ab_offset'])
|
||||
|
||||
@classmethod
|
||||
async def connect(cls, device=None):
|
||||
@ -34,7 +34,7 @@ class Scope(vm.VirtualMachine):
|
||||
reader = writer = streams.SerialStream(device=device)
|
||||
elif ':' in device:
|
||||
host, port = device.split(':', 1)
|
||||
Log.info(f"Connecting to remote scope at {host}:{port}")
|
||||
LOG.info(f"Connecting to remote scope at {host}:{port}")
|
||||
reader, writer = await asyncio.open_connection(host, int(port))
|
||||
else:
|
||||
raise ValueError(f"Don't know what to do with {device!r}")
|
||||
@ -43,7 +43,7 @@ class Scope(vm.VirtualMachine):
|
||||
return scope
|
||||
|
||||
async def setup(self):
|
||||
Log.info("Resetting scope")
|
||||
LOG.info("Resetting scope")
|
||||
await self.reset()
|
||||
await self.issue_get_revision()
|
||||
revision = ((await self.read_replies(2))[1]).decode('ascii')
|
||||
@ -53,10 +53,8 @@ class Scope(vm.VirtualMachine):
|
||||
self.awg_sample_buffer_size = 1024
|
||||
self.awg_minimum_clock = 33
|
||||
self.awg_maximum_voltage = 3.3
|
||||
self.analog_params = self.AnalogParams(20, 300, 335, 355, 18.5, -7.585)
|
||||
self.analog_offsets = {'A': -9.5e-3, 'B': 9.5e-3}
|
||||
self.analog_default_low = -5.5
|
||||
self.analog_default_high = 8
|
||||
self.analog_params = {'x1': self.AnalogParams(20, 300, 335, 355, 18.5, -7.585, 7.9, -5.5, 19e-3),
|
||||
'x10': self.AnalogParams(20, 303, 350, 355, 187.3, -91.9, 64.2, -70.2, 234e-3)}
|
||||
self.analog_lo_min = 0.07
|
||||
self.analog_hi_max = 0.88
|
||||
self.logic_low = 0
|
||||
@ -68,10 +66,21 @@ class Scope(vm.VirtualMachine):
|
||||
else:
|
||||
raise RuntimeError(f"Unsupported scope, revision: {revision}")
|
||||
self._awg_running = False
|
||||
Log.info(f"Initialised scope, revision: {revision}")
|
||||
LOG.info(f"Initialised scope, revision: {revision}")
|
||||
|
||||
def calculate_lo_hi(self, low, high, params=None):
|
||||
params = self.analog_params if params is None else self.AnalogParams(*params)
|
||||
def __enter__(self):
|
||||
return self
|
||||
|
||||
def __exit__(self, exc_type, exc_value, traceback):
|
||||
self.close()
|
||||
|
||||
def close(self):
|
||||
super().close()
|
||||
LOG.info("Closed scope")
|
||||
|
||||
def calculate_lo_hi(self, low, high, params):
|
||||
if not isinstance(params, self.AnalogParams):
|
||||
params = self.AnalogParams(*(list(params) + [None]*(9-len(params))))
|
||||
l = (low - params.offset) / params.scale
|
||||
h = (high - params.offset) / params.scale
|
||||
dl = l - params.rd*(h-l)/params.rr + params.rd*l/params.rb
|
||||
@ -79,7 +88,7 @@ class Scope(vm.VirtualMachine):
|
||||
return dl, dh
|
||||
|
||||
async def capture(self, channels=['A'], trigger=None, trigger_level=None, trigger_type='rising', hair_trigger=False,
|
||||
period=1e-3, nsamples=1000, timeout=None, low=None, high=None, raw=False, trigger_position=0.25):
|
||||
period=1e-3, nsamples=1000, timeout=None, low=None, high=None, raw=False, trigger_position=0.25, probes='x1'):
|
||||
analog_channels = set()
|
||||
logic_channels = set()
|
||||
for channel in channels:
|
||||
@ -136,18 +145,19 @@ class Scope(vm.VirtualMachine):
|
||||
else:
|
||||
raise ValueError("Unable to find appropriate capture mode")
|
||||
|
||||
analog_params = self.analog_params[probes]
|
||||
if raw:
|
||||
lo, hi = low, high
|
||||
else:
|
||||
if low is None:
|
||||
low = self.analog_default_low if analog_channels else self.logic_low
|
||||
elif low < self.analog_default_low:
|
||||
Log.warning(f"Voltage range is below safe minimum: {low} < {self.analog_default_low}")
|
||||
low = analog_params.safe_low if analog_channels else self.logic_low
|
||||
elif low < analog_params.safe_low:
|
||||
LOG.warning(f"Voltage range is below safe minimum: {low} < {analog_params.safe_low}")
|
||||
if high is None:
|
||||
high = self.analog_default_high if analog_channels else self.logic_high
|
||||
elif high > self.analog_default_high:
|
||||
Log.warning(f"Voltage range is above safe maximum: {high} > {self.analog_default_high}")
|
||||
lo, hi = self.calculate_lo_hi(low, high)
|
||||
high = analog_params.safe_high if analog_channels else self.logic_high
|
||||
elif high > analog_params.safe_high:
|
||||
LOG.warning(f"Voltage range is above safe maximum: {high} > {analog_params.safe_high}")
|
||||
lo, hi = self.calculate_lo_hi(low, high, analog_params)
|
||||
|
||||
spock_option = vm.SpockOption.TriggerTypeHardwareComparator
|
||||
kitchen_sink_a = kitchen_sink_b = 0
|
||||
@ -161,7 +171,7 @@ class Scope(vm.VirtualMachine):
|
||||
kitchen_sink_b |= vm.KitchenSinkB.AnalogFilterEnable
|
||||
if trigger_level is None:
|
||||
trigger_level = (high + low) / 2
|
||||
trigger_level = (trigger_level - self.analog_params.offset) / self.analog_params.scale
|
||||
trigger_level = (trigger_level - analog_params.offset) / analog_params.scale
|
||||
if trigger == 'A' or trigger == 'B':
|
||||
if trigger == 'A':
|
||||
spock_option |= vm.SpockOption.TriggerSourceA
|
||||
@ -202,7 +212,7 @@ class Scope(vm.VirtualMachine):
|
||||
|
||||
sample_period = ticks*clock_scale*self.capture_clock_period
|
||||
sample_rate = 1/sample_period
|
||||
Log.info(f"Begin {('mixed' if logic_channels else 'analogue') if analog_channels else 'logic'} signal capture "
|
||||
LOG.info(f"Begin {('mixed' if logic_channels else 'analogue') if analog_channels else 'logic'} signal capture "
|
||||
f"at {sample_rate:,.0f} samples per second (trace mode {capture_mode.trace_mode.name})")
|
||||
async with self.transaction():
|
||||
await self.set_registers(TraceMode=capture_mode.trace_mode, BufferMode=capture_mode.buffer_mode,
|
||||
@ -243,7 +253,7 @@ class Scope(vm.VirtualMachine):
|
||||
DumpChan=dump_channel, DumpCount=asamples, DumpRepeat=1, DumpSend=1, DumpSkip=0)
|
||||
await self.issue_program_spock_registers()
|
||||
await self.issue_analog_dump_binary()
|
||||
value_multiplier, value_offset = (1, 0) if raw else ((high-low), low+self.analog_offsets[channel])
|
||||
value_multiplier, value_offset = (1, 0) if raw else (high-low, low-analog_params.ab_offset/2*(1 if channel == 'A' else -1))
|
||||
data = await self.read_analog_samples(asamples, capture_mode.sample_width)
|
||||
traces[channel] = DotDict({'timestamps': timestamps[dump_channel::len(analog_channels)] if len(analog_channels) > 1 else timestamps,
|
||||
'samples': array.array('d', (value*value_multiplier+value_offset for value in data)),
|
||||
@ -266,7 +276,7 @@ class Scope(vm.VirtualMachine):
|
||||
'sample_period': sample_period,
|
||||
'sample_rate': sample_rate,
|
||||
'cause': cause})
|
||||
Log.info(f"{nsamples} samples captured on {cause}, traces: {', '.join(traces)}")
|
||||
LOG.info(f"{nsamples} samples captured on {cause}, traces: {', '.join(traces)}")
|
||||
return traces
|
||||
|
||||
async def start_generator(self, frequency, waveform='sine', wavetable=None, ratio=0.5,
|
||||
@ -288,19 +298,19 @@ class Scope(vm.VirtualMachine):
|
||||
actualf = 1 / (width * clock * self.awg_clock_period)
|
||||
error = abs(frequency - actualf) / frequency
|
||||
if error < max_error:
|
||||
possible_params.append(((error == 0, width), (size, nwaves, clock, actualf)))
|
||||
possible_params.append((width if error == 0 else -error, (size, nwaves, clock, actualf)))
|
||||
if not possible_params:
|
||||
raise ValueError("No solution to required frequency/min_samples/max_error")
|
||||
size, nwaves, clock, actualf = sorted(possible_params)[-1][1]
|
||||
async with self.transaction():
|
||||
if wavetable is None:
|
||||
mode = {'sine': 0, 'triangle': 1, 'sawtooth': 1, 'exponential': 2, 'square': 3}[waveform.lower()]
|
||||
mode = {'sine': 0, 'triangle': 1, 'exponential': 2, 'square': 3}[waveform.lower()]
|
||||
await self.set_registers(Cmd=0, Mode=mode, Ratio=ratio)
|
||||
await self.issue_synthesize_wavetable()
|
||||
else:
|
||||
wavetable = [min(max(0, int(round(y*255))),255) for y in wavetable]
|
||||
if len(wavetable) != self.awg_wavetable_size:
|
||||
raise ValueError(f"Wavetable data must be {self.awg_wavetable_size} samples")
|
||||
wavetable = bytes(min(max(0, int(round(y*255))),255) for y in wavetable)
|
||||
await self.set_registers(Cmd=0, Mode=1, Address=0, Size=1)
|
||||
await self.wavetable_write_bytes(wavetable)
|
||||
async with self.transaction():
|
||||
@ -318,7 +328,7 @@ class Scope(vm.VirtualMachine):
|
||||
await self.set_registers(KitchenSinkB=vm.KitchenSinkB.WaveformGeneratorEnable)
|
||||
await self.issue_configure_device_hardware()
|
||||
self._awg_running = True
|
||||
Log.info(f"Signal generator running at {actualf:0.1f}Hz")
|
||||
LOG.info(f"Signal generator running at {actualf:0.1f}Hz")
|
||||
return actualf
|
||||
|
||||
async def stop_generator(self):
|
||||
@ -327,7 +337,7 @@ class Scope(vm.VirtualMachine):
|
||||
await self.issue_control_waveform_generator()
|
||||
await self.set_registers(KitchenSinkB=0)
|
||||
await self.issue_configure_device_hardware()
|
||||
Log.info("Signal generator stopped")
|
||||
LOG.info("Signal generator stopped")
|
||||
self._awg_running = False
|
||||
|
||||
async def read_wavetable(self):
|
||||
@ -349,13 +359,13 @@ class Scope(vm.VirtualMachine):
|
||||
if int((await self.read_replies(2))[1], 16) != byte:
|
||||
raise RuntimeError("Error writing EEPROM byte")
|
||||
|
||||
async def calibrate(self, n=32):
|
||||
async def calibrate(self, probes='x1', n=32):
|
||||
import numpy as np
|
||||
from scipy.optimize import least_squares
|
||||
items = []
|
||||
await self.start_generator(frequency=1000, waveform='square')
|
||||
for lo in np.linspace(self.analog_lo_min, 0.5, n, endpoint=False):
|
||||
for hi in np.linspace(0.5, self.analog_hi_max, n):
|
||||
for hi in np.linspace(self.analog_hi_max, 0.5, n):
|
||||
traces = await self.capture(channels=['A','B'], period=2e-3, nsamples=2000, timeout=0, low=lo, high=hi, raw=True)
|
||||
A = np.array(traces.A.samples)
|
||||
A.sort()
|
||||
@ -378,22 +388,23 @@ class Scope(vm.VirtualMachine):
|
||||
def f(params, lo, hi, low, high, offset):
|
||||
clo, chi = self.calculate_lo_hi(low, high, params)
|
||||
return np.sqrt((lo-clo)**2 + (hi-chi)**2)
|
||||
result = least_squares(f, self.analog_params, args=items, bounds=([0, 200, 200, 200, 18, -8], [50, 400, 400, 400, 19, -7]))
|
||||
start_params = self.analog_params.get(probes, self.AnalogParams(20, 300, 300, 300, 18.5, -7.585, None, None, None))[:-3]
|
||||
result = least_squares(f, start_params, args=items, bounds=([10, 200, 200, 200, 1, -500], [30, 400, 400, 400, 1000, 0]))
|
||||
if result.success:
|
||||
Log.info(f"Calibration succeeded: {result.message}")
|
||||
params = self.analog_params = self.AnalogParams(*result.x)
|
||||
Log.info(f"Analog parameters: rd={params.rd:.1f}Ω rr={params.rr:.1f}Ω rt={params.rt:.1f}Ω rb={params.rb:.1f}Ω "
|
||||
f"scale={params.scale:.3f}V offset={params.offset:.3f}V")
|
||||
LOG.info(f"Calibration succeeded: {result.message}")
|
||||
lo, hi, low, high, offset = items
|
||||
clo, chi = self.calculate_lo_hi(low, high)
|
||||
offset_mean = offset.mean()
|
||||
LOG.info(f"Mean A-B offset: {offset_mean*1000:.1f}mV (+/- {100*offset.std()/offset_mean:.1f}%)")
|
||||
params = self.analog_params[probes] = self.AnalogParams(*result.x, round(items[3,0],1), round(items[2,0],1), offset_mean)
|
||||
LOG.info(f"Analog parameters: rd={params.rd:.1f}Ω rr={params.rr:.1f}Ω rt={params.rt:.1f}Ω rb={params.rb:.1f}Ω "
|
||||
f"scale={params.scale:.3f}V offset={params.offset:.3f}V "
|
||||
f"safe_high={params.safe_high:.1f}V safe_low={params.safe_low:.1f}V")
|
||||
clo, chi = self.calculate_lo_hi(low, high, params)
|
||||
lo_error = np.sqrt((((clo-lo)/(hi-lo))**2).mean())
|
||||
hi_error = np.sqrt((((chi-hi)/(hi-lo))**2).mean())
|
||||
Log.info(f"Mean error: lo={lo_error*10000:.1f}bps hi={hi_error*10000:.1f}bps")
|
||||
offset_mean = offset.mean()
|
||||
Log.info(f"Mean A-B offset: {offset_mean*1000:.1f}mV (+/- {100*offset.std()/offset_mean:.1f}%)")
|
||||
self.analog_offsets = {'A': -offset_mean/2, 'B': +offset_mean/2}
|
||||
LOG.info(f"Mean error: lo={lo_error*10000:.1f}bps hi={hi_error*10000:.1f}bps")
|
||||
else:
|
||||
Log.warning(f"Calibration failed: {result.message}")
|
||||
LOG.warning(f"Calibration failed: {result.message}")
|
||||
return result.success
|
||||
|
||||
|
||||
|
||||
55
streams.py
55
streams.py
@ -7,52 +7,33 @@ Package for asynchronous serial IO.
|
||||
|
||||
import asyncio
|
||||
import logging
|
||||
import os
|
||||
import sys
|
||||
|
||||
import serial
|
||||
from serial.tools.list_ports import comports
|
||||
|
||||
|
||||
Log = logging.getLogger('streams')
|
||||
|
||||
|
||||
if sys.platform == 'linux':
|
||||
|
||||
import fcntl
|
||||
import struct
|
||||
|
||||
TIOCGSERIAL = 0x541E
|
||||
TIOCSSERIAL = 0x541F
|
||||
ASYNC_LOW_LATENCY = 1<<13
|
||||
SERIAL_STRUCT_FORMAT = '2iI5iH2ci2HPHIL'
|
||||
SERIAL_FLAGS_INDEX = 4
|
||||
|
||||
def set_low_latency(fd):
|
||||
data = list(struct.unpack(SERIAL_STRUCT_FORMAT, fcntl.ioctl(fd, TIOCGSERIAL, b'\0'*struct.calcsize(SERIAL_STRUCT_FORMAT))))
|
||||
data[SERIAL_FLAGS_INDEX] |= ASYNC_LOW_LATENCY
|
||||
fcntl.ioctl(fd, TIOCSSERIAL, struct.pack(SERIAL_STRUCT_FORMAT, *data))
|
||||
|
||||
else:
|
||||
|
||||
def set_low_latency(fd):
|
||||
pass
|
||||
|
||||
LOG = logging.getLogger('streams')
|
||||
|
||||
|
||||
class SerialStream:
|
||||
|
||||
@classmethod
|
||||
def stream_matching(cls, vid, pid, **kwargs):
|
||||
def devices_matching(cls, vid=None, pid=None, serial=None):
|
||||
for port in comports():
|
||||
if port.vid == vid and port.pid == pid:
|
||||
return SerialStream(port.device, **kwargs)
|
||||
if (vid is None or vid == port.vid) and (pid is None or pid == port.pid) and (serial is None or serial == port.serial_number):
|
||||
yield port.device
|
||||
|
||||
@classmethod
|
||||
def stream_matching(cls, vid=None, pid=None, serial=None, **kwargs):
|
||||
for device in cls.devices_matching(vid, pid, serial):
|
||||
return SerialStream(device, **kwargs)
|
||||
raise RuntimeError("No matching serial device")
|
||||
|
||||
def __init__(self, device, loop=None, **kwargs):
|
||||
self._device = device
|
||||
self._connection = serial.Serial(self._device, timeout=0, write_timeout=0, **kwargs)
|
||||
set_low_latency(self._connection)
|
||||
Log.debug(f"Opened SerialStream on {device}")
|
||||
LOG.debug(f"Opened SerialStream on {device}")
|
||||
self._loop = loop if loop is not None else asyncio.get_event_loop()
|
||||
self._output_buffer = bytes()
|
||||
self._output_buffer_empty = None
|
||||
@ -71,11 +52,11 @@ class SerialStream:
|
||||
n = self._connection.write(data)
|
||||
except serial.SerialTimeoutException:
|
||||
n = 0
|
||||
except:
|
||||
Log.exception("Error writing to stream")
|
||||
except Exception:
|
||||
LOG.exception("Error writing to stream")
|
||||
raise
|
||||
if n:
|
||||
Log.debug(f"Write {data[:n]!r}")
|
||||
LOG.debug(f"Write {data[:n]!r}")
|
||||
self._output_buffer = data[n:]
|
||||
else:
|
||||
self._output_buffer += data
|
||||
@ -93,11 +74,11 @@ class SerialStream:
|
||||
except serial.SerialTimeoutException:
|
||||
n = 0
|
||||
except Exception as e:
|
||||
Log.exception("Error writing to stream")
|
||||
LOG.exception("Error writing to stream")
|
||||
self._output_buffer_empty.set_exception(e)
|
||||
self.remove_writer(self._connection)
|
||||
self._loop.remove_writer(self._connection)
|
||||
if n:
|
||||
Log.debug(f"Write {self._output_buffer[:n]!r}")
|
||||
LOG.debug(f"Write {self._output_buffer[:n]!r}")
|
||||
self._output_buffer = self._output_buffer[n:]
|
||||
if not self._output_buffer:
|
||||
self._loop.remove_writer(self._connection)
|
||||
@ -109,7 +90,7 @@ class SerialStream:
|
||||
w = self._connection.in_waiting
|
||||
if w:
|
||||
data = self._connection.read(w if n is None else min(n, w))
|
||||
Log.debug(f"Read {data!r}")
|
||||
LOG.debug(f"Read {data!r}")
|
||||
return data
|
||||
else:
|
||||
future = self._loop.create_future()
|
||||
|
||||
12
vm.py
12
vm.py
@ -21,7 +21,7 @@ import logging
|
||||
import struct
|
||||
|
||||
|
||||
Log = logging.getLogger('vm')
|
||||
LOG = logging.getLogger('vm')
|
||||
|
||||
|
||||
class Register(namedtuple('Register', ['base', 'dtype', 'description'])):
|
||||
@ -262,7 +262,7 @@ class VirtualMachine:
|
||||
if isinstance(cmd, str):
|
||||
cmd = cmd.encode('ascii')
|
||||
if not self._transactions:
|
||||
Log.debug(f"Issue: {cmd!r}")
|
||||
LOG.debug(f"Issue: {cmd!r}")
|
||||
self._writer.write(cmd)
|
||||
await self._writer.drain()
|
||||
echo = await self._reader.readexactly(len(cmd))
|
||||
@ -280,7 +280,7 @@ class VirtualMachine:
|
||||
index = data.find(b'\r')
|
||||
if index >= 0:
|
||||
reply = data[:index]
|
||||
Log.debug(f"Read reply: {reply!r}")
|
||||
LOG.debug(f"Read reply: {reply!r}")
|
||||
replies.append(reply)
|
||||
data = data[index+1:]
|
||||
else:
|
||||
@ -292,13 +292,13 @@ class VirtualMachine:
|
||||
async def reset(self):
|
||||
if self._transactions:
|
||||
raise TypeError("Command transaction in progress")
|
||||
Log.debug("Issue reset")
|
||||
LOG.debug("Issue reset")
|
||||
self._writer.write(b'!')
|
||||
await self._writer.drain()
|
||||
while not (await self._reader.read()).endswith(b'!'):
|
||||
pass
|
||||
self._reply_buffer = b''
|
||||
Log.debug("Reset complete")
|
||||
LOG.debug("Reset complete")
|
||||
|
||||
async def set_registers(self, **kwargs):
|
||||
cmd = ''
|
||||
@ -306,7 +306,7 @@ class VirtualMachine:
|
||||
for base, name in sorted((Registers[name].base, name) for name in kwargs):
|
||||
register = Registers[name]
|
||||
bs = register.encode(kwargs[name])
|
||||
Log.debug(f"{name} = 0x{''.join(f'{b:02x}' for b in reversed(bs))}")
|
||||
LOG.debug(f"{name} = 0x{''.join(f'{b:02x}' for b in reversed(bs))}")
|
||||
for i, byte in enumerate(bs):
|
||||
if cmd:
|
||||
cmd += 'z'
|
||||
|
||||
Reference in New Issue
Block a user