Hi, > how does sigrok behave if I put two triggers on two different channels (for > example: on one channel rising edge and on the other the falling edge)? I don't think sigrok has any rules or restrictions when it comes to multiple triggers. libsigrok.h simply specifies triggers, trigger stages and trigger matches. In other words, it allows specifying a list of triggers on multiple channels with arbitrary combination of matches (e.g. rising edge, falling edge, trigger threshold (for analog channels etc.)
> Does it depend perhaps on the hw (I have a DreamSourceLab DSLogic Plus)? In most of the cases yes. Triggers are often implemented directly in HW and depending on the HW this behavior for multiple triggers are different. This may also be the reason why sigrok is quite generic when it comes to triggers. There is also something which is called soft trigger (libsigrok/soft-trigger.c) which performs trigger matching inside of the HW driver before sending samples to the upper layer (pulseview/sigrok). This acts more as an initial guard before sending samples while the the HW already sends the samples to the driver. > I can't believe that it's an AND of the two instead, because in fact if I put > two triggers on front it's very unlikely that the two fronts will happen > together. The demo device for instance makes use of the soft trigger and if you look at the implementation of the soft trigger, you will see it performs a logic AND (see soft_trigger_logic_check() - you can also check the behavior in pulseview). But i agree with you, especially at high sample rates this may become unpractical since the probability that two matches happen on the same sample decreases. As far as DSLogic devices are concerned: I can only tell that the trigger configuration is sent to the device in set_trigger() (libsigrok/src/hardware/dreamsourcelab-dslogic/protocol.c). Essentially, this function maps between libsigrok trigger list and the trigger configuration DSLogic HW expects. I don't know by heart what is the actual behavior then in hardware, i'm using single triggers only. Let me check with my DSLogic U3Pro16 the next days to see how it behaves. Christian. _______________________________________________ sigrok-devel mailing list sigrok-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sigrok-devel
