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 ==== | ||
− | HID interface | + | *HID interface |
− | |||
− | |||
− | + | Enable HID in menuconfig | |
− | + | <pre>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 </pre> | ||
− | + | *I2C interface | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
+ | Enable I2C bus in menuconfig | ||
− | + | <pre>Device drivers ---> | |
+ | I2C support ---> | ||
+ | <*> I2C support | ||
+ | [*] Enable compatibility bits for old user-space | ||
+ | <*> I2C device interface | ||
+ | <*> I2C bus multiplexing support | ||
+ | Multiplexer I2C Chip support ---> | ||
+ | |||
+ | </pre> | ||
− | + | copy and rename .config to arch/arm/configs/imx_v7_android_defconfig | |
==== Test ==== | ==== Test ==== | ||
− | The ''getevent'' tool | + | The ''getevent'' tool provides information about the touch device. |
<pre># getevent -lt | <pre># getevent -lt | ||
[ 78826.389007] EV_ABS ABS_MT_TRACKING_ID 0000001f | [ 78826.389007] EV_ABS ABS_MT_TRACKING_ID 0000001f | ||
Line 44: | Line 52: | ||
[ 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