Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to configure Capacitive Multi-touch Display"
From ESS-WIKI
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+ | ==== Introduction ==== | ||
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+ | 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 ==== | ||
− | HID interface | + | *HID interface |
− | + | Enable HID in menuconfig | |
<pre>Device Drivers ---> | <pre>Device Drivers ---> | ||
Input device support ---> | Input device support ---> | ||
Line 10: | Line 14: | ||
HID Devices ---> | HID Devices ---> | ||
[*]/dev/hidraw raw HID device support Special HID drivers ---> | [*]/dev/hidraw raw HID device support Special HID drivers ---> | ||
− | <*> HID Multitouch panels | + | <*> HID Multitouch panels </pre> |
− | </pre> | ||
− | + | *I2C interface | |
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− | + | Enable I2C bus in menuconfig | |
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<pre>Device drivers ---> | <pre>Device drivers ---> | ||
I2C support ---> | I2C support ---> | ||
Line 41: | Line 28: | ||
<*> I2C bus multiplexing support | <*> I2C bus multiplexing support | ||
Multiplexer I2C Chip support ---> | Multiplexer I2C Chip support ---> | ||
− | + | ||
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</pre> | </pre> | ||
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[ 78826.468719] EV_ABS ABS_MT_TRACKING_ID ffffffff | [ 78826.468719] EV_ABS ABS_MT_TRACKING_ID ffffffff | ||
[ 78826.468719] EV_SYN SYN_REPORT 00000000 | [ 78826.468719] EV_SYN SYN_REPORT 00000000 | ||
+ | </pre> | ||
+ | |||
+ | For developer mode option, showing touch points and locations on the screen | ||
+ | <pre>Settings > Developer Options > Show touches | ||
+ | Settings > Developer Options > pointer location | ||
</pre> | </pre> |
Latest revision as of 09:31, 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