global load and one shot load

Hi Quentin,

Apologies for the late response. The sync event is configurable by you.

For each EPWM module, you can define a sync source (a sync input called "SYNCI"), and a sync output (called "SYNCO"). These can be two completely separate/independent signals, or you can just pass through the input signal as the output (and then use that output signal to sync another PWM module, for example).

If you look at the TRM Figure 18-7. Time-Base Counter Synchronization Scheme, you can see how the signals can be used by EPWM modules and passed through to synchronize other EPWM modules. For example, EPWM1 can source its syncing from an external signal. It can also output a sync signal for other EPWM modules (down the sync line) to use as a sync source. You could also, for example, select a counter=0 event as the EPWM1 sync-out source. This means that every time EPWM1's counter matches '0', a pulse will be generated on the SYNC-OUT line and you can use this sync pulse as a SYNC-IN "event" in other EPWM trigger certain actions. So to sum up, the sync signal can be generated by a variety of events depending on your application/need. It will result in a single pulse that can be used to trigger other actions to occur (such as phase shifting, etc.)

I also wanted to highlight some of our resources that have some helpful information on these topics.

1. The EPWM developer's guide, which walks through a very clear and simple setting up of the EPWM using all of the various submodules. This includes the action qualifiers as well as setting up synchronization (section 3.3) in the timebase submodule. It shows how you can easily configure this using the sysconfig GUI, but also does show the driverlib code as well.
2. Another resource is the EPWM video series. You can watch through all of them (they are pretty short videos) or also skip to the submodules you are having trouble with (such as the time base submodule or action qualifier submodule).
3. If these are not detailed enough, the TRM sections have quite detailed descriptions of applying these here are a few you may find helpful:
   
   1. 18.4.3.3 Time-Base Counter Synchronization
   2. 18.4.6 Time-Base Counter Modes and Timing Waveforms

Let me know if any of these help clarify things! If not, feel free to comment back here and I'll be happy to assist further 

Best Regards,

Allison

Hi Quentin,

Glad everything explained prior was clear! 

Yes, so the synchronization does incur delay as the device TRM states:

So if the base2 PWM has global load based on a sync signal, this would also incur some delay. Let me know if you have issues/doubts with this.

Best Regards,

Allison