mirror of
https://github.com/jonathanhogg/scopething
synced 2025-07-14 03:02:09 +01:00
Add clock control; change analog calibration significantly; general improvements
This commit is contained in:
197
scope.py
197
scope.py
@ -16,13 +16,16 @@ import vm
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LOG = logging.getLogger('scope')
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class UsageError(Exception):
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pass
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class ConfigurationError(Exception):
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pass
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class Scope(vm.VirtualMachine):
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AnalogParams = namedtuple('AnalogParams', ['rd', 'rr', 'rt', 'rb', 'scale', 'offset', 'safe_high', 'safe_low', 'ab_offset'])
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AnalogParams = namedtuple('AnalogParams', ['la', 'lb', 'lc', 'ha', 'hb', 'hc', 'scale', 'offset', 'safe_low', 'safe_high', 'ab_offset'])
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@classmethod
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async def connect(cls, device=None):
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@ -46,24 +49,23 @@ class Scope(vm.VirtualMachine):
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await self.issue_get_revision()
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revision = ((await self.read_replies(2))[1]).decode('ascii')
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if revision == 'BS000501':
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self.capture_clock_period = 25e-9
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self.master_clock_period = 25e-9
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self.capture_buffer_size = 12<<10
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self.awg_clock_period = self.capture_clock_period
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self.awg_wavetable_size = 1024
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self.awg_sample_buffer_size = 1024
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self.awg_minimum_clock = 33
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self.awg_maximum_voltage = 3.3
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self.analog_params = {'x1': self.AnalogParams(20.2, 300, 339, 352, 18.5, -7.59, 8, -5.5, 19e-3),
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'x10': self.AnalogParams(20.6, 302, 353, 351, 188, -92, 65.5, -70.9, 236e-3)}
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self.logic_low = 0
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self.awg_maximum_voltage = self.clock_voltage = self.logic_high = 3.3
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self.analog_params = {'x1': self.AnalogParams(1.11, -6.57e-2, 8.46e-3, 1.11, -7.32e-2, -5.19e-2, 18.28, -7.45, -5.5, 8, 5.3e-3),
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'x10': self.AnalogParams(1.10, -6.11e-2, 8.61e-3, 1.10, -6.68e-2, -4.32e-2, 184.3, -90.4, -71.3, 65.7, 175e-3)}
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self.analog_lo_min = 0.07
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self.analog_hi_max = 0.88
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self.logic_low = 0
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self.logic_high = 3.3
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self.timeout_clock_period = (1<<8) * self.capture_clock_period
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self.timestamp_rollover = (1<<32) * self.capture_clock_period
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self.timeout_clock_period = (1<<8) * self.master_clock_period
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self.timestamp_rollover = (1<<32) * self.master_clock_period
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else:
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raise RuntimeError(f"Unsupported scope, revision: {revision}")
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self._awg_running = False
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self._clock_running = False
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LOG.info(f"Initialised scope, revision: {revision}")
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def __enter__(self):
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@ -78,11 +80,11 @@ class Scope(vm.VirtualMachine):
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def calculate_lo_hi(self, low, high, params):
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if not isinstance(params, self.AnalogParams):
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params = self.AnalogParams(*(list(params) + [None]*(9-len(params))))
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params = self.AnalogParams(*(list(params) + [None]*(11-len(params))))
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l = (low - params.offset) / params.scale
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h = (high - params.offset) / params.scale
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dl = l - params.rd*(h-l)/params.rr + params.rd*l/params.rb
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dh = h + params.rd*(h-l)/params.rr - params.rd*(1-h)/params.rt
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dl = params.la*l + params.lb*h + params.lc
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dh = params.ha*h + params.hb*l + params.hc
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return dl, dh
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async def capture(self, channels=['A'], trigger=None, trigger_level=None, trigger_type='rising', hair_trigger=False,
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@ -108,6 +110,8 @@ class Scope(vm.VirtualMachine):
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raise ValueError(f"Unrecognised channel: {channel}")
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if self._awg_running and 4 in logic_channels:
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logic_channels.remove(4)
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if self._clock_running and 5 in logic_channels:
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logic_channels.remove(5)
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if 'A' in analog_channels and 7 in logic_channels:
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logic_channels.remove(7)
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if 'B' in analog_channels and 6 in logic_channels:
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@ -115,25 +119,25 @@ class Scope(vm.VirtualMachine):
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analog_enable = sum(1<<(ord(channel)-ord('A')) for channel in analog_channels)
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logic_enable = sum(1<<channel for channel in logic_channels)
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ticks = int(round(period / nsamples / self.capture_clock_period))
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ticks = int(round(period / nsamples / self.master_clock_period))
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for capture_mode in vm.CaptureModes:
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if capture_mode.analog_channels == len(analog_channels) and capture_mode.logic_channels == bool(logic_channels):
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if ticks > capture_mode.clock_high and capture_mode.clock_divide:
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for clock_scale in range(2, vm.Registers.ClockScale.maximum_value+1):
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test_ticks = int(round(period / nsamples / self.capture_clock_period / clock_scale))
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test_ticks = int(round(period / nsamples / self.master_clock_period / clock_scale))
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if test_ticks in range(capture_mode.clock_low, capture_mode.clock_high + 1):
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ticks = test_ticks
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break
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else:
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continue
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break
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elif ticks > capture_mode.clock_low:
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elif ticks >= capture_mode.clock_low:
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clock_scale = 1
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if ticks > capture_mode.clock_high:
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ticks = capture_mode.clock_high
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else:
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continue
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n = int(round(period / ticks / self.capture_clock_period / clock_scale))
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n = int(round(period / ticks / self.master_clock_period / clock_scale))
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if len(analog_channels) == 2:
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n -= n % 2
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buffer_width = self.capture_buffer_size // capture_mode.sample_width
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@ -207,7 +211,7 @@ class Scope(vm.VirtualMachine):
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if timeout is None:
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trigger_timeout = 0
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else:
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trigger_timeout = int(math.ceil(((trigger_intro+trigger_outro+trace_outro+2)*ticks*clock_scale*self.capture_clock_period
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trigger_timeout = int(math.ceil(((trigger_intro+trigger_outro+trace_outro+2)*ticks*clock_scale*self.master_clock_period
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+ timeout)/self.timeout_clock_period))
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if trigger_timeout > vm.Registers.Timeout.maximum_value:
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if timeout > 0:
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@ -215,7 +219,7 @@ class Scope(vm.VirtualMachine):
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else:
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raise ConfigurationError("Required trigger timeout too long, use a later trigger position")
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sample_period = ticks*clock_scale*self.capture_clock_period
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sample_period = ticks*clock_scale*self.master_clock_period
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sample_rate = 1/sample_period
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LOG.info(f"Begin {('mixed' if logic_channels else 'analogue') if analog_channels else 'logic'} signal capture "
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f"at {sample_rate:,.0f} samples per second (trace mode {capture_mode.trace_mode.name})")
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@ -248,8 +252,8 @@ class Scope(vm.VirtualMachine):
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address -= address % 2
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traces = vm.DotDict()
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timestamps = array.array('d', (t*self.capture_clock_period for t in range(start_timestamp, timestamp, ticks*clock_scale)))
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start_time = start_timestamp*self.capture_clock_period
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timestamps = array.array('d', (t*self.master_clock_period for t in range(start_timestamp, timestamp, ticks*clock_scale)))
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start_time = start_timestamp*self.master_clock_period
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for dump_channel, channel in enumerate(sorted(analog_channels)):
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asamples = nsamples // len(analog_channels)
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async with self.transaction():
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@ -261,7 +265,7 @@ class Scope(vm.VirtualMachine):
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value_multiplier, value_offset = (1, 0) if raw else (high-low, low-analog_params.ab_offset/2*(1 if channel == 'A' else -1))
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data = await self.read_analog_samples(asamples, capture_mode.sample_width)
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traces[channel] = vm.DotDict({'timestamps': timestamps[dump_channel::len(analog_channels)] if len(analog_channels) > 1 else timestamps,
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'samples': array.array('d', (value*value_multiplier+value_offset for value in data)),
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'samples': array.array('f', (value*value_multiplier+value_offset for value in data)),
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'start_time': start_time+sample_period*dump_channel,
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'sample_period': sample_period*len(analog_channels),
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'sample_rate': sample_rate/len(analog_channels),
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@ -284,23 +288,24 @@ class Scope(vm.VirtualMachine):
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LOG.info(f"{nsamples} samples captured on {cause}, traces: {', '.join(traces)}")
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return traces
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async def start_generator(self, frequency, waveform='sine', wavetable=None, ratio=0.5,
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low=0, high=None, min_samples=50, max_error=1e-4):
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async def start_waveform(self, frequency, waveform='sine', ratio=0.5, low=0, high=None, min_samples=50, max_error=1e-4):
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if self._clock_running:
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raise UsageError("Cannot start waveform generator while clock in use")
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if high is None:
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high = self.awg_maximum_voltage
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elif high < 0 or high > self.awg_maximum_voltage:
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raise ValueError(f"high out of range (0-{self.awg_maximum_voltage})")
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if low < 0 or low > high:
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raise ValueError("offset out of range (0-high)")
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raise ValueError("low out of range (0-high)")
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possible_params = []
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max_clock = int(math.floor(1 / frequency / min_samples / self.awg_clock_period))
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max_clock = int(math.floor(1 / frequency / min_samples / self.master_clock_period))
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for clock in range(self.awg_minimum_clock, max_clock+1):
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width = 1 / frequency / (clock * self.awg_clock_period)
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width = 1 / frequency / (clock * self.master_clock_period)
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if width <= self.awg_sample_buffer_size:
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nwaves = int(self.awg_sample_buffer_size / width)
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size = int(round(nwaves * width))
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width = size / nwaves
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actualf = 1 / (width * clock * self.awg_clock_period)
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actualf = 1 / (width * clock * self.master_clock_period)
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error = abs(frequency - actualf) / frequency
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if error < max_error:
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possible_params.append((width if error == 0 else -error, (size, nwaves, clock, actualf)))
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@ -308,16 +313,16 @@ class Scope(vm.VirtualMachine):
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raise ConfigurationError("No solution to required frequency/min_samples/max_error")
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size, nwaves, clock, actualf = sorted(possible_params)[-1][1]
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async with self.transaction():
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if wavetable is None:
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if isinstance(waveform, str):
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mode = {'sine': 0, 'triangle': 1, 'exponential': 2, 'square': 3}[waveform.lower()]
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await self.set_registers(Cmd=0, Mode=mode, Ratio=ratio)
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await self.issue_synthesize_wavetable()
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else:
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if len(wavetable) != self.awg_wavetable_size:
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raise ValueError(f"Wavetable data must be {self.awg_wavetable_size} samples")
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elif len(wavetable) == self.awg_wavetable_size:
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wavetable = bytes(min(max(0, int(round(y*255))),255) for y in wavetable)
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await self.set_registers(Cmd=0, Mode=1, Address=0, Size=1)
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await self.wavetable_write_bytes(wavetable)
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else:
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raise ValueError(f"waveform must be a valid name or {self.awg_wavetable_size} samples")
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async with self.transaction():
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offset = (high+low)/2 - self.awg_maximum_voltage/2
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await self.set_registers(Cmd=0, Mode=0, Level=(high-low)/self.awg_maximum_voltage,
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@ -328,7 +333,7 @@ class Scope(vm.VirtualMachine):
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async with self.transaction():
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await self.set_registers(Cmd=2, Mode=0, Clock=clock, Modulo=size,
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Mark=10, Space=1, Rest=0x7f00, Option=0x8004)
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await self.issue_control_waveform_generator()
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await self.issue_control_clock_generator()
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async with self.transaction():
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await self.set_registers(KitchenSinkB=vm.KitchenSinkB.WaveformGeneratorEnable)
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await self.issue_configure_device_hardware()
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@ -336,15 +341,41 @@ class Scope(vm.VirtualMachine):
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LOG.info(f"Signal generator running at {actualf:0.1f}Hz")
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return actualf
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async def stop_generator(self):
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async def stop_waveform(self):
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if not self._awg_running:
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raise UsageError("Waveform generator not in use")
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async with self.transaction():
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await self.set_registers(Cmd=1, Mode=0)
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await self.issue_control_waveform_generator()
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await self.issue_control_clock_generator()
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await self.set_registers(KitchenSinkB=0)
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await self.issue_configure_device_hardware()
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LOG.info("Signal generator stopped")
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self._awg_running = False
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async def start_clock(self, frequency, ratio=0.5, max_error=1e-4):
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if self._awg_running:
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raise UsageError("Cannot start clock while waveform generator in use")
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ticks = min(max(2, int(round(1 / frequency / self.master_clock_period))), vm.Registers.Clock.maximum_value)
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fall = min(max(1, int(round(ticks * ratio))), ticks-1)
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actualf, actualr = 1 / ticks / self.master_clock_period, fall / ticks
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if abs(actualf - frequency) / frequency > max_error:
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raise ConfigurationError("No solution to required frequency and max_error")
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async with self.transaction():
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await self.set_registers(Map5=0x12, Clock=ticks, Rise=0, Fall=fall, Control=0x80, Cmd=3, Mode=0)
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await self.issue_control_clock_generator()
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self._clock_running = True
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LOG.info(f"Clock generator running at {actualf:0.1f}Hz, {actualr*100:.0f}% duty cycle")
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return actualf, actualr
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async def stop_clock(self):
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if not self._clock_running:
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raise UsageError("Clock not in use")
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async with self.transaction():
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await self.set_registers(Map5=0, Cmd=1, Mode=0)
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await self.issue_control_clock_generator()
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LOG.info("Clock generator stopped")
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self._clock_running = False
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async def read_wavetable(self):
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with self.transaction():
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self.set_registers(Address=0, Size=self.awg_wavetable_size)
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@ -366,59 +397,66 @@ class Scope(vm.VirtualMachine):
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async def calibrate(self, probes='x1', n=32):
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import numpy as np
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from scipy.optimize import least_squares, minimize
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from scipy.optimize import minimize
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items = []
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await self.start_generator(frequency=1000, waveform='square')
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async def measure(lo, hi, period=2e-3, chop=True):
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if chop:
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traces = await self.capture(channels=['A','B'], period=period, nsamples=2000, timeout=0, low=lo, high=hi, raw=True)
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A = np.array(traces.A.samples)
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B = np.array(traces.B.samples)
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else:
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A = np.array((await self.capture(channels=['A'], period=period/2, nsamples=1000, timeout=0, low=lo, high=hi, raw=True)).A.samples)
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B = np.array((await self.capture(channels=['B'], period=period/2, nsamples=1000, timeout=0, low=lo, high=hi, raw=True)).B.samples)
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Amean = A.mean()
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Azero, Afull = np.median(A[A<=Amean]), np.median(A[A>=Amean])
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Bmean = B.mean()
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Bzero, Bfull = np.median(B[B<=Bmean]), np.median(B[B>=Bmean])
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return (Azero + Bzero) / 2, (Afull + Bfull) / 2, ((Afull - Bfull) + (Azero - Azero)) / 2
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await self.start_clock(frequency=2000)
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zero, full, offset = await measure(1/3, 2/3)
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zero = (zero + 1) / 3
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full = (full + 1) / 3
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analog_scale = self.clock_voltage / (full - zero)
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analog_offset = -zero * analog_scale
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LOG.info(f"Analog full range = {analog_scale:.1f}V, zero offset = {analog_offset:.1f}V")
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for lo in np.linspace(self.analog_lo_min, 0.5, n, endpoint=False):
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for hi in np.linspace(self.analog_hi_max, 0.5, n):
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if len(items) % 2 == 0:
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traces = await self.capture(channels=['A','B'], period=2e-3, nsamples=2000, timeout=0, low=lo, high=hi, raw=True)
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A = np.array(traces.A.samples)
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B = np.array(traces.B.samples)
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else:
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A = np.array((await self.capture(channels=['A'], period=2e-3, nsamples=1000, timeout=0, low=lo, high=hi, raw=True)).A.samples)
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B = np.array((await self.capture(channels=['B'], period=2e-3, nsamples=1000, timeout=0, low=lo, high=hi, raw=True)).B.samples)
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A.sort()
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Azero, Amax = A[25:475].mean(), A[525:975].mean()
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if Azero < 0.01 or Amax > 0.99:
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continue
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B.sort()
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Bzero, Bmax = B[25:475].mean(), B[525:975].mean()
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if Bzero < 0.01 or Bmax > 0.99:
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continue
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zero = (Azero + Bzero) / 2
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analog_range = self.awg_maximum_voltage / ((Amax + Bmax)/2 - zero)
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low = -zero * analog_range
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high = low + analog_range
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offset = ((Amax - Bmax) + (Azero - Bzero))/2 * analog_range
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items.append((lo, hi, low, high, offset))
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await self.stop_generator()
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period = 2e-3 if len(items) % 4 < 2 else 1e-3
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zero, full, offset = await measure(lo, hi, 2e-3 if len(items) % 4 < 2 else 1e-3, len(items) % 2 == 0)
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if zero > 0.01 and full < 0.99 and full > zero:
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analog_range = self.clock_voltage / (full - zero)
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items.append((lo, hi, -zero*analog_range, (1-zero)*analog_range, offset*analog_range))
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await self.stop_clock()
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items = np.array(items).T
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def f(params, lo, hi, low, high, offset):
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clo, chi = self.calculate_lo_hi(low, high, params)
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return np.sqrt((lo-clo)**2 + (hi-chi)**2)
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start_params = self.analog_params.get(probes, self.AnalogParams(20, 300, 300, 300, 18.5, -7.585, None, None, None))[:-3]
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result = least_squares(f, start_params, args=items, bounds=([10, 200, 200, 200, 1, -500], [30, 400, 400, 400, 1000, 0]))
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lo, hi, low, high, offset = items
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def f(params):
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dl, dh = self.calculate_lo_hi(low, high, self.AnalogParams(*params, analog_scale, analog_offset, None, None, None))
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return np.sqrt((lo-dl)**2 + (hi-dh)**2).mean()
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start_params = self.analog_params.get(probes, [1,0,0,1,0,0])[:6]
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result = minimize(f, start_params, method='SLSQP',
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bounds=[(1,np.inf), (-np.inf,0), (0,np.inf), (1,np.inf), (-np.inf,0), (-np.inf,0)],
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constraints=[{'type': 'eq', 'fun': lambda x: x[0]*1/3 + x[1]*2/3 + x[2] - 1/3},
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{'type': 'eq', 'fun': lambda x: x[3]*2/3 + x[4]*1/3 + x[5] - 2/3}])
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if result.success:
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LOG.info(f"Calibration succeeded: {result.message}")
|
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lo, hi, low, high, offset = items
|
||||
offset_mean = offset.mean()
|
||||
LOG.info(f"Mean A-B offset: {offset_mean*1000:.1f}mV (+/- {100*offset.std()/offset_mean:.1f}%)")
|
||||
params = self.AnalogParams(*result.x, analog_scale, analog_offset, None, None, None)
|
||||
def f(x):
|
||||
lo, hi = self.calculate_lo_hi(x[0], x[1], result.x)
|
||||
lo, hi = self.calculate_lo_hi(x[0], x[1], params)
|
||||
return np.sqrt((self.analog_lo_min - lo)**2 + (self.analog_hi_max - hi)**2)
|
||||
safe_low, safe_high = minimize(f, (low[0],high[0])).x
|
||||
params = self.analog_params[probes] = self.AnalogParams(*result.x, safe_high, safe_low, 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 "
|
||||
safe_low, safe_high = minimize(f, (low[0], high[0])).x
|
||||
offset_mean = offset.mean()
|
||||
params = self.analog_params[probes] = self.AnalogParams(*result.x, analog_scale, analog_offset, safe_low, safe_high, offset_mean)
|
||||
LOG.info(f"Analog parameters: la={params.la:.3e} lb={params.lb:.3e} lc={params.lc:.3e} "
|
||||
f"ha={params.ha:.3e} hb={params.hb:.3e} hc={params.hc:.3e} "
|
||||
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")
|
||||
f"safe_low={params.safe_low:.1f}V safe_high={params.safe_high:.1f}V "
|
||||
f"ab_offset={offset_mean*1000:.1f}mV (±{100*offset.std()/offset_mean:.1f}%)")
|
||||
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")
|
||||
else:
|
||||
LOG.warning(f"Calibration failed: {result.message}")
|
||||
return items
|
||||
return result.success
|
||||
|
||||
|
||||
@ -454,7 +492,7 @@ async def main():
|
||||
logging.basicConfig(level=logging.DEBUG if args.debug else (logging.INFO if args.verbose else logging.WARNING), stream=sys.stdout)
|
||||
s = await Scope.connect(args.device)
|
||||
|
||||
def await(g):
|
||||
def await_(g):
|
||||
task = asyncio.Task(g)
|
||||
while True:
|
||||
try:
|
||||
@ -463,7 +501,7 @@ def await(g):
|
||||
task.cancel()
|
||||
|
||||
def capture(*args, **kwargs):
|
||||
return await(s.capture(*args, **kwargs))
|
||||
return await_(s.capture(*args, **kwargs))
|
||||
|
||||
def capturep(*args, **kwargs):
|
||||
import pandas
|
||||
@ -471,10 +509,13 @@ def capturep(*args, **kwargs):
|
||||
return pandas.DataFrame({channel: pandas.Series(trace.samples, trace.timestamps) for (channel,trace) in traces.items()})
|
||||
|
||||
def calibrate(*args, **kwargs):
|
||||
return await(s.calibrate(*args, **kwargs))
|
||||
return await_(s.calibrate(*args, **kwargs))
|
||||
|
||||
def generate(*args, **kwargs):
|
||||
return await(s.start_generator(*args, **kwargs))
|
||||
def start_waveform(*args, **kwargs):
|
||||
return await_(s.start_waveform(*args, **kwargs))
|
||||
|
||||
def start_clock(*args, **kwargs):
|
||||
return await_(s.start_clock(*args, **kwargs))
|
||||
|
||||
if __name__ == '__main__':
|
||||
asyncio.get_event_loop().run_until_complete(main())
|
||||
|
||||
Reference in New Issue
Block a user