7" Capacitive Display (Touch) not working with iMX6 and Aster Carrier Board

Technical Support
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1

I recently connected the 7" capacitive touch display to an Aster carrier board to see if I could get make it work. I was able to get the resolution changed using U-boot but I could never get the touch feature working.

I followed the instructions using the First Steps with Capacitive Touch. I tried all of the commands for the iMX6 but nothing would make a difference. I even tried flipping each end of the connector to see if it would help.

I also tried two separate displays and two separate cables.

Below are two text files. One is a dmesg log and the other is the output for fw_printenv fdt_fixup.

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I also took photos (below) of my installation.

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Any suggestions would be greatly appreciated. Thanks.

Scott

2

Hi @sbickle99

Your connections are correct. Since you are using the dedicated Interface Connector, you need to setup fdt_fixup differently. You applied the settings for the touch adapter which is needed only for the Colibri Evaluation Board.

Best regards, Jaski

3

Hi Jaski,

Thanks. I should have known better. I actually tried the other setup first but it didn’t work so I tried the ‘dedicated Interface Connector’ option just to see if it would make a difference.

My current fdt_fixup setup is below. Unfortunately it hasn’t made a difference.

setenv fdt_fixup 'fdt addr ${fdt_addr_r} && fdt set /soc/aips-bus@02100000/i2c@021a8000/atmel_mxt_ts@4a status okay'

Just to be clear, should I notice the touch working on the linux desktop after trying this command? Trying the modprobe atmel_mxt_ts option also does nothing.

Are there any other commands or tests I can run that help clarify things? Thanks again.

Scott

4

Hi Jaski,

I decided to try the display using WinCE and the touch works just fine. So, I can confirm that the connections and hardware are working properly.

I’m just not able to get it working with Linux, which is what I need for our application.

Scott

5

Hi Jaski,

I tried again using Linux and received the following output when executing the modprobe atmel_mxt_ts command.

[  337.296977] imx6dl-pinctrl 20e0000.iomuxc: pin MX6DL_PAD_EIM_CS1 already requested by 21b8000.weim; cannot claim for 2-00a
[  337.308324] imx6dl-pinctrl 20e0000.iomuxc: pin-80 (2-004a) status -22                                                     
[  337.314913] imx6dl-pinctrl 20e0000.iomuxc: could not request pin 80 (MX6DL_PAD_EIM_CS1) from group mxt-ts  on device 20e0c
[  337.326808] atmel_mxt_ts 2-004a: Error applying setting, reverse things back                                              
root@colibri-imx6:~# [  337.462408] atmel_mxt_ts 2-004a: Direct firmware load for maxtouch.cfg failed with error -2          
[  337.470831] atmel_mxt_ts 2-004a: Falling back to user helper                                                              
[  337.488264] atmel_mxt_ts 2-004a: T100 Touchscreen size X799Y479                                                           
[  337.496087] input: Atmel maXTouch Touchscreen as /devices/soc0/soc/2100000.aips-bus/21a8000.i2c/i2c-2/2-004a/input/input7 
[  337.512584] atmel_mxt_ts 2-004a: Family: 164 Variant: 11 Firmware V1.2.AA Objects: 41

Any ideas on why I’m getting these errors? Thanks.

Scott

6

hi @sbickle99

Thanks for the log. You need to set the uboot variable fdt_file device tree file to imx6dl-colibri-aster.dtb.
You can do this in two ways, either from Uboot or Linux.

UBoot: # setenv fdt_file 'imx6dl-colibri-aster.dtb' 
Linux : fw_setenv fdt_file imx6dl-colibri-aster.dtb

We need to add this in the documentation. Sorry for the Inconvenience.

Best regards, Jaski

7

Hi Jaski,

Thanks! It’s working now.

Scott

8

Perfect that it works. Thanks for the feedback.