Difference between revisions of "ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/Touchscreen"
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! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ||
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date | ||
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ||
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First Release | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First Release | ||
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=== Description === | === Description === | ||
| − | The Touchscreen interface is available on | + | The Touchscreen interface is available on the Evaluation Kit at the connector ''J20'' |
| − | + | ''J20'' is a 6 pin ''Molex PicoBlade'' connector for the I2C and control signals needed by most of the capacitive TSC. | |
| − | + | This interface can be configured to work with 3.3V (default) or 5V power and signal levels. | |
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| − | [[File: | + | [[File:{{{nome-som}}-EVB-Touchscreen-connector.png|thumb|center|500px|Touchscreen connector]] |
| − | + | ===Signals === | |
The following table describes the interface signals: | The following table describes the interface signals: | ||
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=== Device usage === | === Device usage === | ||
| − | The simplest tools for touch screen management are the | + | The simplest tools for touch screen management are the tslib library and ts_tools utilities. To calibrate the touch screen, the <code>ts_calibrate</code> command line tool is available. After calibration, the touch screen can be tested using the graphical <code>ts_test</code> utility or the <code>ts_print</code> command line tool. |
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[[Category:ETRA]] | [[Category:ETRA]] | ||
Revision as of 15:20, 31 December 2020
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Touchscreen interface[edit | edit source]
Description[edit | edit source]
The Touchscreen interface is available on the Evaluation Kit at the connector J20
J20 is a 6 pin Molex PicoBlade connector for the I2C and control signals needed by most of the capacitive TSC.
This interface can be configured to work with 3.3V (default) or 5V power and signal levels.
[[File:{Template:Nome-som-EVB-Touchscreen-connector.png|thumb|center|500px|Touchscreen connector]]
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 1 | - | DGND | Ground | |
| 2 | J18.48 | TOUCH_SDA | I2C_SDA | |
| 3 | J18.38 | TOUCH_SCL | I2C_SCL | |
| 4 | J18.101 | TOUCH_VDD | TSC power | powered through a control switch |
| 5 | J18.201 | TOUCH_INT | TSC interrupt | input |
| 6 | J18.199 | TOUCH_RES | TSC reset | output |
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 simplest tools for touch screen management are the tslib library and ts_tools utilities. To calibrate the touch screen, the ts_calibrate command line tool is available. After calibration, the touch screen can be tested using the graphical ts_test utility or the ts_print command line tool.
