Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to configure Capacitive Multi-touch Display"

Revision as of 04:49, 3 February 2017

Configure

• HID interface

Enable HID in menuconfig

Device Drivers --->
       Input device support --->
            <*> Event interface Miscellaneous devices --->
                  <*>User level driver support 
       HID Devices --->
            [*]/dev/hidraw raw HID device support Special HID drivers --->
                  <*> HID Multitouch panels 

• I2C interface

Enable I2C bus in menuconfig

Device drivers --->
        I2C support  --->
            <*> I2C support
                [*]   Enable compatibility bits for old user-space
                <*>   I2C device interface
                <*>   I2C bus multiplexing support
                        Multiplexer I2C Chip support  --->
               

copy and rename .config to arch/arm/configs/imx_v7_android_defconfig

Test

The getevent tool provides information about the touch device.

# getevent -lt
[   78826.389007] EV_ABS       ABS_MT_TRACKING_ID   0000001f
[   78826.389038] EV_ABS       ABS_MT_PRESSURE      000000ab
[   78826.389038] EV_ABS       ABS_MT_POSITION_X    000000ab
[   78826.389068] EV_ABS       ABS_MT_POSITION_Y    0000025b
[   78826.389068] EV_ABS       ABS_MT_SLOT          00000001
[   78826.389068] EV_ABS       ABS_MT_TRACKING_ID   00000020
[   78826.389068] EV_ABS       ABS_MT_PRESSURE      000000b9
[   78826.389099] EV_ABS       ABS_MT_POSITION_X    0000019e
[   78826.389099] EV_ABS       ABS_MT_POSITION_Y    00000361
[   78826.389099] EV_SYN       SYN_REPORT           00000000
[   78826.468688] EV_ABS       ABS_MT_SLOT          00000000
[   78826.468688] EV_ABS       ABS_MT_TRACKING_ID   ffffffff
[   78826.468719] EV_ABS       ABS_MT_SLOT          00000001
[   78826.468719] EV_ABS       ABS_MT_TRACKING_ID   ffffffff
[   78826.468719] EV_SYN       SYN_REPORT           00000000

Show touch points on the screen

Settings > Developer Options > Show touch points