Difference between revisions of "STM32 Oscilloscope"

Revision as of 19:42, 9 May 2010

Features

Vertical (voltage)

Horizontal (Time)

Trigger

• Voltage level trigger
• Trigger on rising / falling edge
• Single trigger / force trigger / trigger continiously
• Auto detect and track trigger level
• Trigger at fixed frequency / Trigger output
• External trigger
• Pretrigger (sample continiously then stop n samples after the trigger)
• Filtered trigger (low frequency / high frequency / number of pulses)
• Video trigger
• RS-232 trigger

Dynamically labelled grid

Auto Scale

• Voltage
• Period

Metered values

• Voltage
• True RMS
• Average
• Peak
• Peak to peak
• Frequency
• Duty

Markers

• Voltage
• t1
• t2
• delta t
• frequency

Data output

• Save display snapshot to picture
• Save display frames for movie
• Save wave data to file (raw / .CSV)
• Stream non interrupted wave data to file

Display roll mode (continuous scrolling)

• BPM mode for heart rate monitoring
• wide range of scroll rates
• dynamically zoom in to check on activity of extremely slow rates

Display modes

• Waveform
• XYZ
• Fourier transform

Spectrum

Average spectrum

Subtract average

Spectrogram

• Turtle - Channel A = speed, Channel B = direction
• TV (pixel brightness)
• Histogram

Pause and scroll back

Protocol decoding

• RS232
• TTL RS232
• IR remotes

DSP

• Pre-scale before process
• Add channels
• Subtract channels
• Multiply channels
• AM demod
• FM demod
• Configurable bandpass filtering
• Phase tracking hum removal
• Audio output

Log playback

Output and control interfaces

• Computer via RS232
• Computer via Wireless RS232
• LCD touch screen
• Computer via USB

Coding

Protocol

One byte each:
C SS DDD...
C = Code
S = Size
D = Data

Commands PC → STM32

• 0 0 4 DDDD - Set sample rate in Hz
• 1 0 5 D DDDD - Trigger mode & voltage

Commands STM32 → PC

Advanced features for the future

• Realtime view and control over IP by another computer
• iPad/IPhone view and control
• Web interface