PiTFT not supported?

[mwagner]

When installing the custom kernel from Adafruit the display works fine. But when installing your kernel https://github.com/notro/rpi-firmware/tree/master I get following error message.

pi@raspberrypi-dev ~ $ sudo modprobe spi-bcm2708 pi@raspberrypi-dev ~ $ sudo modprobe fbtft_device name=adafruitts rotate=90 ERROR: could not insert 'fbtft_device': Invalid argument pi@raspberrypi-dev ~ $

How to fix this?

[notro]

the name is pitft. Adafuit has it's own patched version of fbtft_device.

[mwagner]

Ok with device name pitft it works, but I'm not able to use the GPIOs. Should I compile the kernel using adafruit's fbtft files found on git https://github.com/adafruit/adafruit-rpi-fbtft instead? What patch files should I use then as your patch files are different from the ones adafruit is linking to from their website?

[notro]

Which GPIOs are you referring to?

[mwagner]

I try to access the GPIO by making a device oink as per adafruit manual sudo sh -c "echo 252 > /sys/class/gpio/export" ls -l /sys/class/gpio

The output is (and this is where I miss the gpio252): -rwxrwx--- 1 root gpio 4096 Apr 29 14:19 export
lrwxrwxrwx 1 root gpio 0 Jan 1 1970 gpiochip0 -> ../../devices/virtual/gpio/gpiochip0
-rwxrwx--- 1 root gpio 4096 Jan 1 1970 unexport https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi/extras

[notro]

In the plug'n play image mentioned here: http://forums.adafruit.com/viewtopic.php?f=50&t=51468 /etc/modules has these additions:

stmpe_device cs=1 chip=stmpe610 blocks=gpio,ts irq-pullup irq-gpio=24 irq-base=330 sample-time=4 mod-12b=1 ref-sel=0 adc-freq=2 ave-ctrl=3 touch-det-delay=4 settling=2 fraction-z=7 i-drive=0
gpio_backlight_device gpio=252
#rpi-power-switch gpio_pin=22

stmpe_device adds the touch device and the gpio chip which exposes GPIO252 gpio_backlight_device turns this gpio into a regular linux backlight device

[notro]

Closing issue since there has been no activity for more than 2 months. Reopen if needed.