jonathan/scopething
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Code Issues Releases Wiki Activity

Fix bug in calculating SampleAddress that was breaking mixed signal capture

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Jonathan Hogg
2017-03-30 15:00:59 +01:00
parent 0d3e73439b
commit c5db95ddb1
2 changed files with 8 additions and 7 deletions
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2
README.md
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@ -5,4 +5,6 @@
- Only tested against a BitScope Micro (BS05)
- Requires Python >3.6 and the **pyserial** package
- Also requires **NumPy** and **SciPy** if you want to do analog range calibration
- Having **Pandas** is useful for wrapping capture results for further processing

13
scope.py
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@ -157,9 +157,10 @@ class Scope(vm.VirtualMachine):
nsamples = int(round(period / ticks / self.capture_clock_period / clock_scale / len(analog_channels))) * len(analog_channels)
else:
nsamples = int(round(period / ticks / self.capture_clock_period / clock_scale))
total_samples = nsamples*2 if logic_channels and analog_channels else nsamples
buffer_width = self.capture_buffer_size // capture_mode.sample_width
if total_samples > buffer_width:
if logic_channels and analog_channels:
buffer_width //= 2
if nsamples > buffer_width:
raise RuntimeError("Capture buffer too small for requested capture")
if raw:
@ -234,15 +235,13 @@ class Scope(vm.VirtualMachine):
start_timestamp += 1<<32
timestamp += 1<<32
address = int((await self.read_replies(1))[0], 16)
if capture_mode.BufferMode in {vm.BufferMode.Chop, vm.BufferMode.Dual, vm.BufferMode.MacroChop}:
if capture_mode.BufferMode in {vm.BufferMode.Chop, vm.BufferMode.MacroChop, vm.BufferMode.ChopDual}:
address -= address % 2
elif capture_mode.BufferMode == vm.BufferMode.ChopDual:
address -= address % 4
traces = DotDict()
for dump_channel, channel in enumerate(sorted(analog_channels)):
asamples = nsamples // len(analog_channels)
async with self.transaction():
await self.set_registers(SampleAddress=(address - total_samples) % buffer_width,
await self.set_registers(SampleAddress=(address - nsamples) % buffer_width,
DumpMode=vm.DumpMode.Native if capture_mode.sample_width == 2 else vm.DumpMode.Raw,
DumpChan=dump_channel, DumpCount=asamples, DumpRepeat=1, DumpSend=1, DumpSkip=0)
await self.issue_program_spock_registers()
@ -259,7 +258,7 @@ class Scope(vm.VirtualMachine):
if logic_channels:
async with self.transaction():
await self.set_registers(SampleAddress=(address - total_samples) % buffer_width,
await self.set_registers(SampleAddress=(address - nsamples) % buffer_width,
DumpMode=vm.DumpMode.Raw, DumpChan=128, DumpCount=nsamples, DumpRepeat=1, DumpSend=1, DumpSkip=0)
await self.issue_program_spock_registers()
await self.issue_analog_dump_binary()