Newhaven LVDS Capacitive Display Set - Revision history

Voipac: /* Hardware jumpers Newhaven LVDS */

2025-02-27T16:24:20Z

Hardware jumpers Newhaven LVDS

Voipac: /* Hardware jumpers Newhaven LVDS */

2025-02-27T16:23:32Z

Hardware jumpers Newhaven LVDS

Voipac at 13:49, 11 September 2024

2024-09-11T13:49:07Z

Voipac at 13:47, 11 September 2024

2024-09-11T13:47:12Z

Voipac-hw: /* Touchscreen test */

2022-07-26T16:06:02Z

Touchscreen test

Voipac-hw: /* Touchscreen test */

2022-07-26T16:04:52Z

Touchscreen test

Voipac-hw at 12:17, 23 July 2022

2022-07-23T12:17:26Z

Voipac-hw: /* Hardware connection */

2022-07-23T09:01:16Z

Hardware connection

Voipac-hw: /* Hardware connection */

2022-07-23T08:58:48Z

Hardware connection

Voipac-hw: /* Touchscreen test */

2022-06-02T13:45:45Z

Touchscreen test

@@ Line 23: / Line 23: @@
 [[image:imx8m_LVDS_with_touchscreen_cable_for_NHD.jpg|800px]]
 === Hardware jumpers Newhaven LVDS ===
-Make sure that configurable 0R resistor are assembled to support the default Newhaven LVDS0 interface <br />
+Make sure that configurable 0R resistor are assembled to support the default Newhaven LVDS0 interface: <br />
 [[image:LVDS0 NH jumpers.png|800px]]

@@ Line 23: / Line 23: @@
 [[image:imx8m_LVDS_with_touchscreen_cable_for_NHD.jpg|800px]]
 === Hardware jumpers Newhaven LVDS ===
-Make sure that configurable 0R resistor are moved to Newhaven LVDS0 interface <br />
+Make sure that configurable 0R resistor are assembled to support the default Newhaven LVDS0 interface <br />
 [[image:LVDS0 NH jumpers.png|800px]]
 <br />

@@ Line 1: / Line 1: @@
-[[Category:iMX8M Industial Development Kit]]
+[[Category:iMX8M Industrial Development Kit]]
-[[Category:iMX8M Industial Peripherals]]
+[[Category:iMX8M Industrial Peripherals]]
 <!-- -->
 <div style="float:right">__TOC__</div>

@@ Line 4: / Line 4: @@
 <div style="float:right">__TOC__</div>
-This section shows information about the Newhaven LVDS Capacitive Display Set. The iMX8M Industrial Development Kit in this configuration is equipped with Yocto dunfell, kernel 5.4 to support LVDS display with a touchscreen layer. In this case the display is installed on the top of the iMX8M Development Baseboard.<br />
+This section shows information about the Newhaven LVDS Capacitive Display Set. The iMX8M Industrial Development Kit in this configuration is equipped with Yocto dunfell, kernel 5.4 to support LVDS display with a touchscreen layer. In this case the display is installed on the top of the iMX Development Baseboard.<br />
 [[image:Voipac NHD LCD Assembly.png|800px]]
@@ Line 18: / Line 18: @@
 == Hardware connection ==
 To enable smooth communication between the board and the display, connect the 40 Position FFC cable for LCD and 6 pin touchscreen FFC cable. To implement the display capabilities, following connections need to be made:
-* connection between LVDS Display and iMX8M Development Baseboard connector LVDS0 NHD (J12) using a 40 Position FFC cable
+* connection between LVDS Display and iMX Development Baseboard connector LVDS0 NHD (J12) using a 40 Position FFC cable
-* touchscreen connection between iMX8M Development Baseboard connector NHD Touch (J13) and Touchscreen 6 pin FFC cable
+* touchscreen connection between iMX Development Baseboard connector NHD Touch (J13) and Touchscreen 6 pin FFC cable
 === LVDS and Touchscreen cable ===
 [[image:imx8m_LVDS_with_touchscreen_cable_for_NHD.jpg|800px]]

@@ Line 113: / Line 113: @@
 Touchscreen events are generated after touching capacitive touch screen.
 <syntaxhighlight lang="bash">
 Testing ... (interrupt to exit)
 Event: time 1658851286.1658851286, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 40
@@ Line 121: / Line 120: @@
 Event: time 1658851286.1658851286, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
 Event: time 1658851286.1658851286, -------------- SYN_REPORT ------------
 </syntaxhighlight>

@@ Line 59: / Line 59: @@
 === Touchscreen test ===
-Default Voipac iMX8M Image contain evtest utility to catch touchscreen events. Make sure SiS9509 controller is detected and bound as input device:
+Default Voipac iMX8M Image contain evtest utility to catch touchscreen events. Make sure SiS9509 controller is detected and bound as input device. Select the device event number 1 (generic ft5x06 (79)):
 <syntaxhighlight lang="bash">
-root@imx8mq-voipac:~# dmesg | grep -i SiS9509
+root@imx8mq-voipac:~# evtest
-input: ----------
+No device specified, trying to scan all of /dev/input/event*
-evbug: ----------
+Available devices:
 </syntaxhighlight>
@@ Line 69: / Line 114: @@
 <syntaxhighlight lang="bash">
 root@imx8mq-voipac:~# evtest /dev/input/by-path/platform-21a4000.i2c-event
+Testing ... (interrupt to exit)
+Event: time 1658851286.1658851286, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 40
---
+Event: time 1658851286.1658851286, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 506
----
+Event: time 1658851286.1658851286, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 478
----
+Event: time 1658851286.1658851286, -------------- SYN_REPORT ------------
---
+Event: time 1658851286.1658851286, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
+Event: time 1658851286.1658851286, -------------- SYN_REPORT ------------
 </syntaxhighlight>

@@ Line 5: / Line 5: @@
 This section shows information about the Newhaven LVDS Capacitive Display Set. The iMX8M Industrial Development Kit in this configuration is equipped with Yocto dunfell, kernel 5.4 to support LVDS display with a touchscreen layer. In this case the display is installed on the top of the iMX8M Development Baseboard.<br />
-[[image:iMX8M_Industrial_NH_EMC.jpg|800px]]
+[[image:Voipac NHD LCD Assembly.png|800px]]
 == Mechanical connection ==
@@ Line 14: / Line 14: @@
 * 6 pin touchscreen flat flex  cable
 * necessary spacers
-[[image:iMX8M_Industrial_NH_EMC.jpg|800px]]
+[[image:Voipac NHD LCD Fastener.png|800px]]
 == Hardware connection ==

@@ Line 57: / Line 57: @@
 Default Voipac iMX8M Image contain evtest utility to catch touchscreen events. Make sure SiS9509 controller is detected and bound as input device:
 <syntaxhighlight lang="bash">
-root@imx6-rexultra:~# dmesg | grep -i tsc2007
+root@imx8mq-voipac:~# dmesg | grep -i SiS9509
-input: TSC2007 Touchscreen as /devices/soc0/soc.0/2100000.aips-bus/21a4000.i2c/i2c-1/1-0048/input/input0
+input: ----------
-evbug: Connected device: input0 (TSC2007 Touchscreen at 1-0048/input0)
+evbug: ----------
 </syntaxhighlight>
-Touchscreen events are generated after pressing the resistive layer:
+Touchscreen events are generated after touching capacitive touch screen.
 <syntaxhighlight lang="bash">
-root@imx6-rexultra:~# evtest /dev/input/by-path/platform-21a4000.i2c-event
+root@imx8mq-voipac:~# evtest /dev/input/by-path/platform-21a4000.i2c-event
-Input driver version is 1.0.1
-Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
-Input device name: "TSC2007 Touchscreen"
+--
-Supported events:
+---
-  Event type 0 (EV_SYN)
+---
-  Event type 1 (EV_KEY)
+--
-    Event code 330 (BTN_TOUCH)
-  Event type 3 (EV_ABS)
 </syntaxhighlight>