Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to configure Capacitive Multi-touch Display"
From ESS-WIKI
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| + | ==== Introduction ==== | ||
| + | |||
| + | Because the standard to connect custom capacitive touch devices(single- or multi-touch) is not defined, this resulted in having a variety of touch drivers interface. General speaking, USB/HID and I2C are the common hardware interface. | ||
| + | |||
==== Configure ==== | ==== Configure ==== | ||
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</pre> | </pre> | ||
| − | + | For developer mode option, showing touch points and locations on the screen | |
| − | <pre> | + | <pre>Settings > Developer Options > Show touches |
| − | Settings > Developer Options > | + | Settings > Developer Options > pointer location |
</pre> | </pre> | ||
Latest revision as of 08:31, 3 February 2017
Introduction
Because the standard to connect custom capacitive touch devices(single- or multi-touch) is not defined, this resulted in having a variety of touch drivers interface. General speaking, USB/HID and I2C are the common hardware interface.
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
For developer mode option, showing touch points and locations on the screen
Settings > Developer Options > Show touches Settings > Developer Options > pointer location