Dear zynthianers - hello to everyone !
I have found myself a new quest and almost succeed. Almost is the keyword here.
It is GEN4-4DPI-70CT-CLB touchscreen with GPIO interface, resistive touch 7" with 800x480 resolution. Very nice screen I must say !
After a few days of struggling (changing kernel for the specific version of their drivers and et cetera) I have managed to make the screen itself work nicely on RPi 4 with audioinjector stereo and zynaptik module.
Everything works except touchscreen
It is based on AR1020 chip and has ADS7846 driver responsible for interfacing. But it doesn’t want to work yet. I suspect the problem is in badly written drivers and also in SPI interface but the strange thing leaving the screen alone on RPI doesn’t change the situation:
dmesg | grep spi [ 0.188720] spi-bcm2835 fe204000.spi: could not get clk: -517 [ 0.278322] 4d-hats spi0.0: 4d-hat registered, product code = b4
All the same…
Have anyone struggled with similar SPI issues ?
Any advice ?