[Q] Frequency & duty cycle measurement?

[Csókás Bence]

Hi,

On 2025. 02. 05. 10:30, Csókás Bence wrote:
> Hi,
> 
> On 2025. 02. 05. 0:37, William Breathitt Gray wrote:
>> The first step is to decide which event we'll monitor and on which
>> channel: we want to monitor Capture events so that's
>> COUNTER_EVENT_CAPTURE, and we want event channel 0 (n.b. 0 because
>> that's the channel parameter value passed to counter_push_event() in the
>> driver).

Ah, I push 0 and 1 for the two interrupts... So that's why `channel` has 
to be 0 and 1 as well. Does it make sense to do it this way, or should I 
push on event channel 0 always?

> I had no success using `channel = 0`, only data from `capture0` comes 
> back. If I set both `channel` AND `component.id` to X, then I start to 
> see similar values than what I get from reading sysfs. (For now I 
> hard-coded all values; I agree that the correct way would be to read 
> component IDs from sysfs, but this is still a PoC...)
> 
> Did I do something wrong in implementing the driver maybe? (See the 
> submitted patches.) And any idea as to why I might be seeing the slowdown?

The slowdown is still a mystery though...

Bence