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Contents
TouchscreenEdit
DescriptionEdit
The 4-wire resistive touch controller signals are routed to J50, which is a 4 pin (1mm pitch vertical) ZIF connector for the 4-wires resistive controller.
The touch controller is a TI TSC2003 device, connected to the I²C2 bus (address 0x1001000b).
SignalsEdit
The following table describes the interface signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 1 | - | TSC_YP | Touch controller Y+ | |
| 2 | - | TSC_XP | Touch controller X+ | |
| 3 | - | TSC_YM | Touch controller Y- | |
| 4 | - | TSC_XM | Touch controller X- |
Device mappingEdit
The device is typically mapped to /dev/touchscreen0 device in Linux.
The touch controller is attached to the generic Linux input event interface (evdev).
Device usageEdit
The simplest tools for touch screen management are the tslib library and ts_tools utilities. To calibrate the touch screen, the ts_calibrate command line tool is available.
After calibration, the touch screen can be tested using the graphical ts_test utility or the ts_print command line tool.