struggles with output compare mode one pulse --- stm32l476rg?

[SWenn.1]

Hello...

I am struggling (for a week now) trying to figure out how this output compare stuff works....Documentation is very poor on this and naming conventions are all over the place....

I would like to gate timer15 with a pulse from timer1. I am experimenting with timer1 output compare to do this bcz it seems PWM will not work. I am trying to port out a signal to PA8 on output compare channel 1 to test and then the hope is via one of the TRGO selections I can then move it to there. So the questions :

1. what am I doing wrong in the picture (you cannot see it but I have checked One Pulse Mode)....my expectation based on settings is to get a high pulse at 998 counts for 1 pulse and this should repeat based on Retriggerable OPM1?? scope indicates pin goes high one time and that is it
2. Assuming I can get a pulse out of this thing to see using OC Mode will it be possible to send this to TRGO to gate another timer??
3. Is there a way to have PWM port out to TRGO to gate a second timer?

Please don't refer me to manuals I have scoured these things and the lack of good info seems scarce at best for what I am trying to do.....

Thank you

 

[waclawek.jan]

Try to describe us what do you want to achieve, perhaps drawing a timing diagram.

JW

[SWenn.1]

This is the ultimate picture but I'd be happy understanding how to gate say tim15 with tim1 ....I have tim15 set up as PWM output but it runs continuously....

[KnarfB]

A more educational ressource is AN4776 Application note "General-purpose timer cookbook for STM32 microcontrollers"

hth

KnarfB