Bureaucrats, dave_user, Administrators
8,253
edits
Changes
no edit summary
<section begin="History" />
{| style="border-collapse:collapse; "
!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
|-
|-
|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"|X.Y.Z{{oldid|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"12508|Month Year2021/01/11}}|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"|TBDFirst Release
|-
|-
|}
<section end="History" /><section begin="Body" />
==Touchscreen interface ==
ETRA Evaluation Kit uses, by default, the USB interface for connecting the touchscreen controller. Anyway, the I2C interface is available too and - optionally - can be activated in the device tree for enabling the I2C touch controller driver. === Description USB touchscreen === The USB OTG port - available on J16 connector - is configured as USB Host controller for driving the touchscreen. For this purpose, it is required to enable the <code>USB OTG ID</code> signals a low. This can be possible using the S1.4 DIP switch which forces the ID signal as low: [[File:ETRA-EVK-USB-touchscreen.png|thumb|center|300px|Touchscreen connector]] [[File:ETRA_EVK-S1.4-USB_OTG_ID.png|thumb|center|300px|USB OTG ID set to low]]
This interface can be configured to work with 3.3V (default) or 5V power and signal levels.
[[File:{{{nomeETRA-som}}EVK-EVBI2C-Touchscreen-connectortouchscreen.png|thumb|center|500px|Touchscreen connector]]
====Signals ====
The following table describes the interface signals:
{| class="wikitable"
! latexfontsize="scriptsize"| Pin#! latexfontsize="scriptsize"| SOM Pin#! latexfontsize="scriptsize"| Pin name! latexfontsize="scriptsize"| Pin function! latexfontsize="scriptsize"| Pin Notes
|-
|1,2,4,6,,7,8,10
| -
| N.A.DGND| N.C.Ground| Not connected
|-
| 32| J1J18.18948| RS232_RXTOUCH_SDA| Receive lineI2C_SDA
|
|-
| 3
| J1J18.18738| RS232_TXTOUCH_SCL| Transmit lineI2C_SCL
|
|-
| 94|J18.101| TOUCH_VDD| TSC power| powered through a control switch| -| DGND5|J18.201|TOUCH_INT|TSC interrupt|input|-|6|J18.199|TOUCH_RES| GroundTSC reset| output
|}
=== Device mapping ===
=== Device usage ===
The simplest tools for touch screen management are the <code>tslib</code> library and <code>ts_tools</code> utilities. To connect to calibrate the debug serial port: # connect touch screen, the DB9 adapter bracket to <code>ts_calibrate</code> command line tool is available. After calibration, the J22 connector on touch screen can be tested using the SBCX board# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1graphical <code>ts_test</code> utility or the <code>ts_print</code> command line tool.
----
[[Category:ETRA]]