Fbtft...

aquilegia

Reply 10# tony_zhang

I appreciate your work. Hope to see good result soon.

aquilegia

Reply  tony_zhang


Wow, Great! Actually today I also succeeded to turn on the lcd with comment of t ...
aquilegia Posted at 2014-9-5 07:33

With help of notro, ads7846 touchscreen driver works finally!You have to set the following kernel build options.
CONFIG_REGULATOR=y
CONFIG_REGULATOR_DUMMY=y

gloorung

Hi,

Is the full .config file available for building the kernel ?

tony_zhang

Reply 12# aquilegia

We also get it work last week.

HWL_Stouf

Hi,
Is it possible you post a complete guide to make it work, please ?
Many thanks !

aquilegia

Reply 15# HWL_Stouf


The following process is what I do.However, you will not have to build kernel and fbtft modules if the lemaker team update raspbian image with them.
First install the dependent packages.
$ sudo apt-get install build-essential u-boot-tools uboot-mkimage libncurses5-dev

Update gcc to 4.7 version.
$ gcc --version # confirm the version
$ sudo apt-get install gcc-4.7 g++-4.7
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.7
$ sudo update-alternatives --config gcc # select 4.7
$ gcc --version # confirm the version

Download kernel source from the git repository of bananapi kernel.
$ git clone --depth 1 https://github.com/LeMaker/linux-bananapi.git
$ cd linux-bananapi/
$ zcat /prog/config.gz > .config

Then download fbtft source from fbtft repository.
$ cd drivers
$ cd video
$ git clone https://github.com/notro/fbtft.git

You have to change the source code to a version before 16 Aug.
$ cd fbtft
$ git checkout 3dcf796b9274f4dd82fea35bc10e23396881e5ab

Edit configuration files.
$ cd ..
$ echo "obj-y += fbtft/" >> Makefile
$ sed -i 's/endmenu/source "drivers\/video\/fbtft\/Kconfig"\n\nendmenu/' Kconfig

Config both fbtft and dummy regulator option from kernel menu.
$ cd ../..
$ make prepare scripts
$ make menuconfig

Enable all fbtft module options.
Device Drivers -> Graphics support ---> < > Support for small TFT LCD display modules (NEW) ---> select all items to “m”

Enable regulator and dummy regulator options or edit .config file
Device Drivers->Voltage and Current Regulator Support -> Provide a dummy regulator if regulator lookups fail
CONFIG_REGULATOR=y
CONFIG_REGULATOR_DUMMY=y

Build kernel uImage and module files. It will take long time about 6-7 hour.
$ make uImage modules

Backup old kernel image and copy the kernel image to the boot partition.
$ sudo cp /boot/bananapi /boot/bananapi_old
$ sudo cp arch/arm/boot/uImage /boot/bananapi

Install modules.
$ sudo make modules_install

Then enable spi and reboot.
$ sudo raspi-config
$ sudo reboot

Install ads7846 device module.
$ git clone https://github.com/notro/fbtft_tools.git
$ cd ads7846_device
$ sudo make install

Installl spi module.
$ sudo modprobe spi-sun7i

You have to insert fbtft module with dma disabled.
$ sudo modprobe fbtft dma=0

The remaining process is same as fbtft wiki page (http://github.com/notro/fbtft/wiki )

igorpec

Reply 16# aquilegia


   I rebuild my kernel with FBTFT support but I have only one SPI display which I have no idea if it is supported.
Here is image or just kernel:
http://www.igorpecovnik.com/2014/09/07/banana-pi-debian-sd-image/

Can someone try with something that works for sure. I was trying different drivers and I get white screen and something on the screen - for example if I choose some device with smaller screen (and similar hardware?) I can see shrinking. That's about all.

I could not get anything on.

hnsncxy

Reply 17# igorpec
Hi, You need to configure your fbtft driver based on the SPI display controller chip, so you must understand the SPI display use what kind of controller chip.

igorpec

Post Last Edited by hnsncxy at 2014-10-8 21:29

Reply  igorpec
Hi, You need to configure your fbt ...
hnsncxy Posted at 2014-10-8 21:24

   It is using ILI9341 which is quite popular as I see but the rest is unknown.

hnsncxy

Reply 19# igorpec
well, The fbtft driver support the ili9341, but you need to close the DMA in the source code, as follow:

1. fbtft-core.c : static bool dma = false;  /*Compatible with Bananapi*/

Copy the Code

you can get more help information by visiting the website https://github.com/notro/fbtft/issues