[Buildroot] How to use the ft6236 touchscreen driver ?

[Buildroot] How to use the ft6236 touchscreen driver ?

[David Picard]

Hi,

I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a 
RPi2, BR 2016.05. When I modprobe ft6236, nothing happens : no message 
in dmesg, no device created in /dev/input. i2cdetect detects it at 
address 38h.

I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).

I tried :
# echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device

and I got something in dmesg :
ft6236 1-0038: irq is missing
ft6236: probe of 1-0038 failed with error -22
i2c i2c-1: new_device: Instantiated device ft6236 at 0x38

But still no entry in /dev/input.

Any idea ?
David.

[Buildroot] How to use the ft6236 touchscreen driver ?

[Baruch Siach]

Hi David,

On Wed, Jul 13, 2016 at 07:07:43PM +0200, David Picard wrote:
> I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a RPi2,
> BR 2016.05. When I modprobe ft6236, nothing happens : no message in dmesg,
> no device created in /dev/input. i2cdetect detects it at address 38h.
> 
> I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).
> 
> I tried :
> # echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device
> 
> and I got something in dmesg :
> ft6236 1-0038: irq is missing
> ft6236: probe of 1-0038 failed with error -22
> i2c i2c-1: new_device: Instantiated device ft6236 at 0x38
> 
> But still no entry in /dev/input.
> 
> Any idea ?

You most likely need to update your device tree file (.dts), and add your 
PiTFT device as a sub-node of the i2c master.

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

[Buildroot] How to use the ft6236 touchscreen driver ?

[David Picard]

Well, could you please give me some directions ? Like where the dts file 
is, how do I compile it, some reference documentation...

Thanks.

Le 13/07/2016 19:16, Baruch Siach a ?crit :
> Hi David,
>
> On Wed, Jul 13, 2016 at 07:07:43PM +0200, David Picard wrote:
>> I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a RPi2,
>> BR 2016.05. When I modprobe ft6236, nothing happens : no message in dmesg,
>> no device created in /dev/input. i2cdetect detects it at address 38h.
>>
>> I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).
>>
>> I tried :
>> # echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device
>>
>> and I got something in dmesg :
>> ft6236 1-0038: irq is missing
>> ft6236: probe of 1-0038 failed with error -22
>> i2c i2c-1: new_device: Instantiated device ft6236 at 0x38
>>
>> But still no entry in /dev/input.
>>
>> Any idea ?
>
> You most likely need to update your device tree file (.dts), and add your
> PiTFT device as a sub-node of the i2c master.
>
> baruch
>

[Buildroot] How to use the ft6236 touchscreen driver ?

[Thomas Petazzoni]

Hello,

On Thu, 14 Jul 2016 11:26:58 +0200, David Picard wrote:

> Well, could you please give me some directions ? Like where the dts file 
> is, how do I compile it, some reference documentation...

This is really unrelated to Buildroot, so this mailing list is probably
not the best place. You can Google for some Device Tree introduction
material, for example.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] How to use the ft6236 touchscreen driver ?

[Peter Seiderer]

Hello David,

On Thu, 14 Jul 2016 11:26:58 +0200, David Picard <davepiq@yahoo.fr> wrote:

> Well, could you please give me some directions ? Like where the dts file 
> is, how do I compile it, some reference documentation...
> 

Maybe try the following additions at the config.txt file (on the boot/vfat partition of the SD card):

# for adafruit 2.8 tft                                                         
dtparam=spi=on                                                                
dtparam=i2c1=on
dtparam=i2c_arm=on
dtoverlay=pitft28-capacitive.dtbo


Enable the following at the buildroot .config file:

BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS=y

And copy images/rpi-firmware/overlays/pitft28-capacitive.dtbo to overlays/pitft28-capacitive.dtbo
on the boot/vfat partition of the SD card...

Regards,
Peter

> Thanks.
> 
> Le 13/07/2016 19:16, Baruch Siach a ?crit :
> > Hi David,
> >
> > On Wed, Jul 13, 2016 at 07:07:43PM +0200, David Picard wrote:
> >> I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a RPi2,
> >> BR 2016.05. When I modprobe ft6236, nothing happens : no message in dmesg,
> >> no device created in /dev/input. i2cdetect detects it at address 38h.
> >>
> >> I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).
> >>
> >> I tried :
> >> # echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device
> >>
> >> and I got something in dmesg :
> >> ft6236 1-0038: irq is missing
> >> ft6236: probe of 1-0038 failed with error -22
> >> i2c i2c-1: new_device: Instantiated device ft6236 at 0x38
> >>
> >> But still no entry in /dev/input.
> >>
> >> Any idea ?
> >
> > You most likely need to update your device tree file (.dts), and add your
> > PiTFT device as a sub-node of the i2c master.
> >
> > baruch
> >
> 
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

[Buildroot] How to use the ft6236 touchscreen driver ?

[David PICARD]

Hi Peter,
It works perfectly. Thank you very much.
David. 

    Le Vendredi 15 juillet 2016 0h16, Peter Seiderer <ps.report@gmx.net> a ?crit :
 

 Hello David,

On Thu, 14 Jul 2016 11:26:58 +0200, David Picard <davepiq@yahoo.fr> wrote:

> Well, could you please give me some directions ? Like where the dts file 
> is, how do I compile it, some reference documentation...
> 

Maybe try the following additions at the config.txt file (on the boot/vfat partition of the SD card):

# for adafruit 2.8 tft? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
dtparam=spi=on? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 
dtparam=i2c1=on
dtparam=i2c_arm=on
dtoverlay=pitft28-capacitive.dtbo


Enable the following at the buildroot .config file:

BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS=y

And copy images/rpi-firmware/overlays/pitft28-capacitive.dtbo to overlays/pitft28-capacitive.dtbo
on the boot/vfat partition of the SD card...

Regards,
Peter

> Thanks.
> 
> Le 13/07/2016 19:16, Baruch Siach a ?crit :
> > Hi David,
> >
> > On Wed, Jul 13, 2016 at 07:07:43PM +0200, David Picard wrote:
> >> I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a RPi2,
> >> BR 2016.05. When I modprobe ft6236, nothing happens : no message in dmesg,
> >> no device created in /dev/input. i2cdetect detects it at address 38h.
> >>
> >> I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).
> >>
> >> I tried :
> >> # echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device
> >>
> >> and I got something in dmesg :
> >> ft6236 1-0038: irq is missing
> >> ft6236: probe of 1-0038 failed with error -22
> >> i2c i2c-1: new_device: Instantiated device ft6236 at 0x38
> >>
> >> But still no entry in /dev/input.
> >>
> >> Any idea ?
> >
> > You most likely need to update your device tree file (.dts), and add your
> > PiTFT device as a sub-node of the i2c master.
> >
> > baruch
> >
> 
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

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