Hi, I've been using a 4 wires resistive touchscreen for a 10.1" LCD on a Beaglebone black with kernel 4.1.16. I've got a problem when getting the pressure value, either from tslib or from evtest. The Z value comes correctly but i get a "0" value randomly every couple of measure, even if I keep my finger on the screen.
ts_test output (time - xabs - yabs - zabs): 1455185513.504536: 480 302 63 1455185513.506526: 480 302 63 1455185513.508427: 481 302 0 1455185513.512350: 483 302 63 1455185513.514351: 483 302 0 1455185513.556991: 482 301 63 1455185513.560917: 482 301 0 1455185513.593729: 483 302 63 1455185513.595683: 483 302 0 1455185513.726991: 487 305 57 1455185513.728921: 487 305 0 1455185513.746334: 488 305 57 1455185513.748301: 488 305 0 evtest output: Event: time 1455185664.339576, -------------- EV_SYN ------------ Event: time 1455185664.341506, type 3 (EV_ABS), code 0 (ABS_X), value 2969 Event: time 1455185664.341506, type 3 (EV_ABS), code 1 (ABS_Y), value 2008 Event: time 1455185664.341506, type 3 (EV_ABS), *code 24 (ABS_PRESSURE), value 109* Event: time 1455185664.341506, -------------- EV_SYN ------------ Event: time 1455185664.343436, type 3 (EV_ABS), code 0 (ABS_X), value 2960 Event: time 1455185664.343436, type 3 (EV_ABS), code 1 (ABS_Y), value 2007 Event: time 1455185664.343436, type 3 (EV_ABS), *code 24 (ABS_PRESSURE), value 0* Event: time 1455185664.343436, -------------- EV_SYN ------------ Event: time 1455185664.345368, type 3 (EV_ABS), code 0 (ABS_X), value 2969 Here is the dts config: fragment@4 { target = <&tscadc>; __overlay__ { status = "okay"; tsc { ti,wires = <4>; ti,x-plate-resistance = <1200>; ti,coordinate-readouts = <5>; ti,wire-config = <0x03 0x10 0x22 0x31>; }; adc { ti,adc-channels = <4 5 6 7>; }; }; }; The touch is okay, but when I go in a drawing app, it only gives me points when I draw a line, instead of a continuous line. Does anyone knows a way to debug this? Did I miss a configuration parameter for the Ti-TSCADC driver? Thanks, Matthieu -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.