0xPIT
January 5, 2025, 9:13pm
1
I use a button to react on press and release only.only while that button is pressed/held .
I’ve tried the PRESSED/RELEASED/LONG_PRESSED_REPEAT events, and the events are repeated while I hold the button → I’d expect one PRESSED and one RELEASED only.
Logging lv_event_get_code(e) on a widget that has 1 callback for the 3 events mentioned:
1
8
1
8
1
8
1
6
8
1
8
1
8
1
8
...
ESP32-S3 ESP-BOX 1.0 with esp-idf; UI created by SquareLine studio
9.2.2
I’d like to create a button that turns on a GPIO only while it is held pressed.
Attaching mentioned events to arbitrary widget types and tracing lv_event_get_code(e), all with the same results as mentioned above.
You might be looking for LV_EVENT_SHORT_CLICKED and LV_EVENT_LONG_PRESSED.
If that does not solve the issue, then the code that generates the event (lv_indev driver?) possibly has a bug.
0xPIT
January 6, 2025, 7:53am
3
Thanks for you reply!
I will investigate.
How would I detect the finger being lifted with just those two?
The short click one only triggers when lifting the finger, but long-press by design triggers as your finger is still down, so you’d likely have to write some state machine code and tie events together. (e.g. with LV_EVENT_RELEASED)
0xPIT
January 6, 2025, 8:40am
5
Hm, does not seem to work as suspected.
I’ve also added a style color for focussed and pressed: while holding my finger, a flicker between them is observable.
I have several other guy buttons and they seem to work fine.
Trace: (mind the “manual grind” → this is for a coffee mill)
Manual grind LV_EVENT_HOVER_OVER
Could it be an electrical connection issue? Perhaps you can try a different switch or just bridge the connections for a test?
0xPIT
January 7, 2025, 8:25pm
7
No, the touch works fine elsewhere.
I’ve just published the thing, so you can see the code here:
Espresso Mill Controller based on ESP32 & LVGL Touchscreen
Thanks for your help.
bahaman
January 13, 2025, 11:11am
8
try reducing the i2c frequency to 100000 (or whatever freq. the specific touch controller needs).