Touch screen on ud7000

trichins · January 15, 2019, 2:31pm

No hard interrupts

trichins · January 15, 2019, 2:45pm

Is there a debounce machinism for touch ?

John_Brochue · January 15, 2019, 5:22pm

On ST processors, only one interrupt can be active on a given pin-number within a port at a time. For example, if you have an interrupt on PA3, you cannot have one on PB3. PB4 is fine though. In this case, the touch interrupt is pin PE3, so you cannot have an interrupt on PI3, SYSD.

trichins · January 15, 2019, 7:01pm

OK, thanks

trichins · January 16, 2019, 5:20pm

I randomly get this exception when handling an event from touch:

I am using ‘TouchDown’ event

trichins · January 16, 2019, 5:40pm

I also get this exception randomly on touch handling:

Gus_Issa · January 17, 2019, 4:04am

We would need to connect am analyzer to see what is happening on the bus but can you for now catch and discard those exceptions?

Gus_Issa · January 17, 2019, 10:33pm

I can’t get it to give me any exceptions. Can you narrow it down some more?

trichins · January 17, 2019, 10:57pm

It happens completely randomly. Just now, on first press after reset. It seemed to happen more often if I hold down. I am using the touchdown event. I have also used the touchmove. touchup didn’t give any event.

John_Brochue · January 18, 2019, 3:33pm

Do you have any other code in your system or any devices connected to the UCM dev board beyond the display?

trichins · January 18, 2019, 5:16pm

I am using CAN

John_Brochue · January 21, 2019, 3:25pm

Just for testing, create a brand new project and only add code to draw on the screen when a touch occurs. No CAN or anything else.