Touch panel polling function not being called

samv — Thu, 26 Dec 2024 03:12:53 GMT

On the LPC54628 dev. board I am trying to combine LWIP with LVGL to create an app with graphics and Ethernet ability. I started with the LWIP demo and added the necessary code to implement the touch panel functions. The issue I am having is that the panel polling function "DEMO_ReadTouch(...)" is not being called. On the original LVLG demo the "DEMO_ReadTouch(...)" function gets called every 100 uS. The "DEMO_InitTouch(void)" function does send 3 bytes of data over the I2C lines so I know the hardware is working. Just above the "DEMO_ReadTouch(...)" function is the line /* Will be called by the library to read the touchpad */ but I don't know where the calling function is to see why it isn't firing.

Does MCUXpresso have a way to see where a function was called from?

Re: Touch panel polling function not being called

samv — Fri, 27 Dec 2024 02:42:28 GMT

I discovered that the lv_task_handler() was not called in the main startup routine. Once I corrected that it is now working fine.

Re: Touch panel polling function not being called

Harry_Zhang — Fri, 27 Dec 2024 03:26:56 GMT

Hi @samv

You can search it in the project.

Harry

topic Re: Touch panel polling function not being called in LPC Microcontrollers

Touch panel polling function not being called

Re: Touch panel polling function not being called

Re: Touch panel polling function not being called