UNICA SBC/Interfaces and Connectors/Touchscreen
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Contents
Touchscreen[edit | edit source]
Description[edit | edit source]
A PCAP touch controller can be connected to J16, which is a 6-pin Molex 53398-0671 connector. The touch controller will be enabled via the SOC I²C bus.
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | Pin name | Pin function |
|---|---|---|
| 1 | +V_TOUCH | Touch power supply |
| 2 | TOUCH_SDA | Touch SDA signal |
| 3 | TOUCH_SCL | Touch SCL signal |
| 4 | TOUCH_INT | Touch interrupt signal |
| 5 | TOUCH_RST | Touch reset signal |
| 6 | DGND | Ground |
Power control[edit | edit source]
The touch controller can be powered with the following signals and levels:
TOUCH_PWREN: used to enable the touch power supply using a GPIO in the GPIO expander+V_TOUCH: the touch power supply can be 3V3 or 5V with an hardware mounting option (3V3 by default)
Device mapping[edit | edit source]
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 usage[edit | edit source]
The touchscreen device is often passed as a parameter to the user interface application or is automatically discovered.
The touchscreen can be tested with the evtest tool that prints the finger coordinates to the console.
