Getting Touchscreen working on Beaglebone Black

Greg Wilson-Lindberg

I'm trying to bring up a custom 5.7" LCD and 4wire resistive touchscreen on TiSDK 7.00.

First let me say that I have the display running correctly with both the original BBB Angstrom Linux and also on Debian Linux.

I've modified the am335x-boneblack.dts file (attached) with changes from our Angstrom/Debian dts file and I have video displaying on the LCD. What I don't have is the touchscreen controller working.

I found a reference to http://processors.wiki.ti.com/index.php/AM335x_Touchscreen_Driver%27s_Guide that mentions setting up the kernel touchscreen driver and when I checked the kernel config the ti touchscreen driver is configured to compile into the kernel.

On further checking of the booted system I found that the mentioned /dev/input/touchscreen device does not exist. Does anybody know what needs to be done to enable the touchscreen device?

over 11 years ago

0 Miroslav Kiradzhiyski XID over 11 years ago

TI__Mastermind 25235 points

Hi Greg,

The TSC Driver Guide you have found is for the old SDK (v6). Check this wiki page for the new SDK (v7): http://processors.wiki.ti.com/index.php/Sitara_Linux_SDK_Touchscreen

Best regards,
Miroslav

0 Greg Wilson-Lindberg over 11 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 120 points

Hi Miroslav,

The link that you gave me has a link to a Sitara TSC ADC Driver Overview page(http://processors.wiki.ti.com/index.php/Sitara_TSC_ADC_Driver_Overview). That page has a link to an ADC Driver guide with kernel configuration information (http://processors.wiki.ti.com/index.php/AM335x_ADC_Driver%27s_Guide#Driver_Configuration). The kernel configuration that is shown doesn't match what is in the kernel (3.12.10) that is distributed with the 7.0.0.0 SDK. There is no Industrial I/O Support line under Staging drivers, nor any of the rest of the IIO options or TI ADC options.

0 Greg Wilson-Lindberg over 11 years ago in reply to Miroslav Kiradzhiyski XID

Prodigy 120 points

There is also no arch/arm/mach-omap2/board-am335xevm.c file in the source tree as mentioned in the Platform data section of the AM335c_ADC_Driver's_Guide page.

Regards,

Greg

0 Greg Wilson-Lindberg over 11 years ago in reply to Greg Wilson-Lindberg

Prodigy 120 points

And at the bottom of the Platform data section there is a link to the source code, that when followed takes you to a git repository for kernel 3.2, not the 3.12 that is distributed with the 7.0.0.0 SDK.

I really don't want to sound harsh, and I do appreciate all of the work that has gone into all of this, but the documentation doesn't seem to be keeping up with the SDK versions. It does make it more difficult to try to build a working system.

Regards,

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Getting Touchscreen working on Beaglebone Black