Waveshare 4" HDMI touchscreen is not working

Hardware
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1

Hi,
Need help with Touchscreen configuration for waveshare 4" HDMI touch screen.
I tried everything mentioned in hub, but still touch is not working.

Thank you,
Shailesh

2

Does it display anything or does touch not work?

3

Display is working perfectly, only issue is with touch screen.
I see these messages.
[ 630.720042] ads7846 spi0.1: Looking up vcc-supply from device tree

[ 630.720093] ads7846 spi0.1: Looking up vcc-supply property in node /soc/bus@c1100000/spi@8d80/touchscreen@1 failed

[ 630.720172] ads7846 spi0.1 : supply vcc not found, using dummy regulator

[ 630.732973] ads7846 spi0.1: touchscreen, irq 51

[ 630.733745] input: ADS7846 Touchscreen as /devices/platform/soc/c1100000.bus/c1108d80.spi/spi_master/spi0/spi0.1/input/input7

4

What board are you running? What did you run to enable the display? Did you follow this?

5

Yes I follow the instructions you mentioned and after that only I am seeing those log message I mentioned in earlier post. and I am using below mentioned board

Thank you,
Shailesh singh

6

Run evtest and then touch the screen. Does it show anything?

7

IMG_5790
IMG_57901920×2739 315 KB

Hi,
Please find attached image for evtest, I dont see anything on screen.

Thank you,
Shailesh

8

Run watch -n 1 cat /proc/interrupts and see if the interrupt pin is incrementing when you touch the screen.

It could also be that the SPI frequency is too high and needs to be lowered in the overlay. Change the max-frequency of the overlay to match Waveshare’s 50KHz setting. Compile and load it.