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Code Issues Releases Wiki Activity

More work on triggering

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This commit is contained in:
Jonathan Hogg
2017-03-27 13:31:28 +01:00
parent ba4fb59313
commit bc6f585e2b
1 changed files with 37 additions and 24 deletions
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61
scope.py
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@ -6,6 +6,7 @@ import logging
import math
import os
import struct
import sys
import streams
import vm
@ -57,7 +58,7 @@ class Scope(vm.VirtualMachine):
self.analog_max = 8
self.capture_clock_period = 25e-9
self.capture_buffer_size = 12*1024
self.trigger_timeout_tick = 6.4e-6
self.timeout_clock_period = 6.4e-6
self.trigger_low = -7.517
self.trigger_high = 10.816
# await self.load_params() XXX switch this off until I understand EEPROM better
@ -101,7 +102,7 @@ class Scope(vm.VirtualMachine):
return dl, dh
async def capture(self, channels=['A'], trigger_channel=None, trigger_level=None, trigger_type='rising', hair_trigger=False,
period=1e-3, nsamples=1000, timeout=None, low=None, high=None, raw=False):
period=1e-3, nsamples=1000, timeout=None, low=None, high=None, raw=False, trigger_point=0.5):
channels = list(channels)
analog_channels = [channel for channel in channels if channel in {'A', 'B'}]
logic = 'L' in channels
@ -121,13 +122,14 @@ class Scope(vm.VirtualMachine):
continue
break
else:
raise RuntimeError(f"Unsupported clock period: {ticks}")
raise RuntimeError("Unable to find appropriate capture mode")
if capture_mode.clock_max is not None and ticks > capture_mode.clock_max:
ticks = capture_mode.clock_max
nsamples = int(round(period / ticks / self.capture_clock_period / clock_scale))
total_samples = nsamples*2 if logic else nsamples
total_samples = nsamples*2 if logic and analog_channels else nsamples
buffer_width = self.capture_buffer_size // capture_mode.sample_width
assert total_samples <= buffer_width
if total_samples > buffer_width:
raise RuntimeError("Capture buffer too small for requested capture")
if raw:
lo, hi = low, high
@ -138,9 +140,6 @@ class Scope(vm.VirtualMachine):
high = self.analog_max
lo, hi = self.calculate_lo_hi(low, high)
if self._generator_running:
kitchen_sink_b |= vm.KitchenSinkB.WaveformGeneratorEnable
analog_enable = 0
if 'A' in channels:
analog_enable |= 1
@ -178,7 +177,7 @@ class Scope(vm.VirtualMachine):
spock_option = vm.SpockOption.TriggerTypeSampledAnalog
kitchen_sink_a = kitchen_sink_b = trigger_mask = trigger_logic = 0
if trigger_level is not None:
for channel, value in trigger_level:
for channel, value in trigger_level.items():
if channel.startswith('L'):
mask = 1<<int(channel[1:])
trigger_mask |= mask
@ -187,13 +186,24 @@ class Scope(vm.VirtualMachine):
if trigger_type.lower() == 'notequal':
spock_option |= vm.SpockOption.TriggerInvert
trigger_intro = 0 if trigger_type.lower() == 'equal' else (1 if hair_trigger else 4)
await self.set_registers(TriggerMask=trigger_mask, TriggerLogic=trigger_logic)
await self.set_registers(TriggerMask=trigger_mask, TriggerLogic=trigger_logic,
TriggerLevel=((low+high)/2-self.trigger_low)/(self.trigger_high-self.trigger_low))
if self._generator_running:
kitchen_sink_b |= vm.KitchenSinkB.WaveformGeneratorEnable
trigger_outro = 2 if hair_trigger else 4
trace_intro = min(max(0, int(nsamples*trigger_point)), nsamples)
trace_outro = max(0, nsamples-trace_intro-trigger_outro)
if timeout is None:
trigger_timeout = int(period*5/self.timeout_clock_period)
else:
trigger_timeout = max(1, int((trace_intro*ticks*clock_scale*self.capture_clock_period + timeout)/self.timeout_clock_period))
await self.set_registers(TraceMode=capture_mode.TraceMode, BufferMode=capture_mode.BufferMode,
SampleAddress=0, ClockTicks=ticks, ClockScale=clock_scale,
TraceIntro=nsamples//2, TraceOutro=nsamples-nsamples//2, TraceDelay=0,
Timeout=max(1, int(round((period*5 if timeout is None else timeout) / self.trigger_timeout_tick))),
TriggerIntro=trigger_intro, TriggerOutro=2 if hair_trigger else 4, Prelude=0,
TraceIntro=trace_intro, TraceOutro=trace_outro, TraceDelay=0,
Timeout=trigger_timeout,
TriggerIntro=trigger_intro, TriggerOutro=trigger_outro, Prelude=0,
SpockOption=spock_option, ConverterLo=lo, ConverterHi=hi,
KitchenSinkA=kitchen_sink_a, KitchenSinkB=kitchen_sink_b,
AnalogEnable=analog_enable, DigitalEnable=logic_enable)
@ -350,29 +360,34 @@ class Scope(vm.VirtualMachine):
"""
$ ipython3 --pylab
resistance$ ipython3 --pylab
Using matplotlib backend: MacOSX
In [1]: run scope
In [1]: import pandas
In [2]: run scope
INFO:scope:Resetting scope
INFO:scope:Initialised scope, revision: BS000501
In [2]: generate(2000, 'triangle')
Out[2]: 2000.0
In [3]: generate(2000, 'triangle')
Out[3]: 2000.0
In [3]: traces = capture('A', low=0, high=3.3)
In [4]: t = pandas.DataFrame(capture(['A', 'B'], low=0, high=3.3))
In [4]: plot(traces.A.keys(), traces.A.values())
Out[4]: [<matplotlib.lines.Line2D at 0x114009160>]
In [5]: t.interpolate().plot()
Out[5]: <matplotlib.axes._subplots.AxesSubplot at 0x10db77d30>
In [5]:
In [6]:
"""
async def main():
global s, x, y, data
global s
parser = argparse.ArgumentParser(description="scopething")
parser.add_argument('device', nargs='?', default=None, type=str, help="Device to connect to")
parser.add_argument('--debug', action='store_true', default=False, help="Debug logging")
args = parser.parse_args()
logging.basicConfig(level=logging.DEBUG if args.debug else logging.INFO, stream=sys.stdout)
s = await Scope.connect(args.device)
#x = np.linspace(0, 2*np.pi, s.awg_wavetable_size, endpoint=False)
#y = np.round((np.sin(x)**5)*127 + 128, 0).astype('uint8')
@ -391,7 +406,5 @@ def generate(*args, **kwargs):
return await(s.start_generator(*args, **kwargs))
if __name__ == '__main__':
import sys
logging.basicConfig(level=logging.DEBUG, stream=sys.stderr)
asyncio.get_event_loop().run_until_complete(main())