Oscilloscope: Wait indefinitely for trigger
bessman opened this issue · comments
Moving fossasia/pslab-python#61 here since it is a feature request that requires firmware support.
asitava1998
Description
We can add the various types of trigger modes found in the oscilloscopes used in Labs. They are as follows:-
A. Auto - This trigger mode allows the oscilloscope to acquire a waveform even when it does not detect a trigger condition. If no trigger condition occurs while the oscilloscope waits for a specific period (as determined by the time-base setting), it will force itself to trigger.
B. Normal - The Normal mode allows the oscilloscope to acquire a waveform only when it is triggered. If no trigger occurs, the oscilloscope will not acquire a new waveform, and the previous waveform, if any, will remain on the display.
C. Single - The Single mode allows the oscilloscope to acquire one waveform each time you press the RUN button, and the trigger condition is detected.
D. Scan – The Scan mode continuously sweeps waveform from left to right.
I can implement these in the oscilloscope UI and these would help to make it more elaborate.
jithinbp
Currently, the indefinite wait-for-trigger option is not available. Which means only the No-trigger, Auto-trigger and scan modes are available.
I will raise this as a firmware issue.
asitava1998
@jithinbp Yes sure. Even I was facing a problem when I was testing my code with a function generator and the PSLab as an oscilloscope.
This is already possible due to how the trigger timeout is implemented:
If DELAY >> TRIGGER_PRESCALER == 0 the trigger won't time out. This is documented in the oscilloscope header since f132af3.
This is not very user friendly, but improving the UX by e.g. letting the user set the timeout as a microsecond value instead is out of scope for this issue.