Difference between revisions of "Newhaven LVDS Capacitive Display Set"
Line 28: | Line 28: | ||
Manually booting with LVDS interface as a primary source for video output: | Manually booting with LVDS interface as a primary source for video output: | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
− | u-boot=> | + | Fastboot: Normal |
+ | Normal Boot | ||
+ | Hit any key to stop autoboot: 0 | ||
+ | u-boot=> | ||
+ | u-boot=> | ||
+ | u-boot=> | ||
+ | u-boot=> | ||
+ | u-boot=> | ||
u-boot=> fatls mmc 0:1 | u-boot=> fatls mmc 0:1 | ||
− | u-boot=> setenv fdt_file | + | 27787776 Image |
+ | 48586 imx8mq-evk-voipac-dp.dtb | ||
+ | 48793 imx8mq-evk-voipac-hdmi.dtb | ||
+ | 49194 imx8mq-evk-voipac-lvds-koe.dtb | ||
+ | 49198 imx8mq-evk-voipac-lvds-newhaven.dtb | ||
+ | |||
+ | 5 file(s), 0 dir(s) | ||
+ | |||
+ | u-boot=> setenv fdt_file imx8mq-evk-voipac-lvds-newhaven.dtb | ||
u-boot=> saveenv | u-boot=> saveenv | ||
− | u-boot=> | + | Saving Environment to MMC... Writing to MMC(0)... OK |
+ | u-boot=> | ||
u-boot=> boot | u-boot=> boot | ||
+ | |||
. | . | ||
</syntaxhighlight> | </syntaxhighlight> |
Revision as of 13:42, 2 June 2022
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.
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Mechanical connection
When combined with the complete iMX8M Industrial Kit, the Display Set creates a compact, ready-to-use solution. To assemble them together, the following mechanical and electrical accessories were designed and selected to be part of the Display set:
- TFT LCD 1024x600 Pixels display with LVDS interface and Capacitive Touch with SiS9509 controller
- 4x Hex Standoff Threaded M3 30.00mm long [Manufacturer PN: 971300321]
- 40 Position flat flex cable 50.80mm long [Manufacturer PN: 0150200427]
- 6 pin touchscreen flat flex cable
- necessary spacers
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
- touchscreen connection between iMX8M Development Baseboard connector NHD Touch (J13) and Touchscreen 6 pin FFC cable
LVDS and Touchscreen cable
Software instructions
iMX8M Industrial kit is preinstalled with Yocto dunfell operation system enabling LVDS and touchscreen capabilities by default. Manual configuration is necessary, Devicetree in U-Boot have to by set to NHD LVDS0 LCD.
LVDS0 NHD Devicetree in U-Boot
Manually booting with LVDS interface as a primary source for video output:
Fastboot: Normal Normal Boot Hit any key to stop autoboot: 0 u-boot=> u-boot=> u-boot=> u-boot=> u-boot=> u-boot=> fatls mmc 0:1 27787776 Image 48586 imx8mq-evk-voipac-dp.dtb 48793 imx8mq-evk-voipac-hdmi.dtb 49194 imx8mq-evk-voipac-lvds-koe.dtb 49198 imx8mq-evk-voipac-lvds-newhaven.dtb 5 file(s), 0 dir(s) u-boot=> setenv fdt_file imx8mq-evk-voipac-lvds-newhaven.dtb u-boot=> saveenv Saving Environment to MMC... Writing to MMC(0)... OK u-boot=> u-boot=> boot .
Touchscreen test
Make sure TSC2007 chip is detected and bound as input device:
root@imx6-rexultra:~# dmesg | grep -i tsc2007 input: TSC2007 Touchscreen as /devices/soc0/soc.0/2100000.aips-bus/21a4000.i2c/i2c-1/1-0048/input/input0 evbug: Connected device: input0 (TSC2007 Touchscreen at 1-0048/input0)
Touchscreen events are generated after pressing the resistive layer:
root@imx6-rexultra:~# 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) Event code 0 (ABS_X) Value 3529 Min 0 Max 4095 Event code 1 (ABS_Y) Value 375 Min 0 Max 4095 Event code 24 (ABS_PRESSURE) Value 0 Min 0 Max 4095 Properties: Testing ... (interrupt to exit) Event: time 1457899907.959665, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1 Event: time 1457899907.959665, type 3 (EV_ABS), code 0 (ABS_X), value 1657 Event: time 1457899907.959665, type 3 (EV_ABS), code 1 (ABS_Y), value 2486 Event: time 1457899907.959665, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 3268 Event: time 1457899907.959665, -------------- EV_SYN ------------ Event: time 1457899907.969094, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0 Event: time 1457899907.969094, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 0 Event: time 1457899907.969094, -------------- EV_SYN ------------