updated README.md, rought draft

README.md

@@ -1,4 +1,70 @@
 # C-Berry_Display
 
 Some code to bring the C-Berry Display alive. 
-Updated code from admatec GmbH so it will compile with newer gcc-versions
+Updated code from admatec GmbH so it will compile with newer gcc-versions
+
+
+## Dependencies:
+
+### Raspberry Pi Userland: https://github.com/raspberrypi/userland
+$ sudo apt install build-essential pkg-config cmake
+$ mkdir /tmp/ramdisk
+$ sudo mount -t tmpfs -o size=128M tmpfs /tmp/ramdisk
+$ cd /tmp/ramdisk
+$ git clone https://github.com/raspberrypi/userland
+$ cd userland
+$ ./buildme
+
+Add login username to /etc/group for audio, video:
+
+...
+audio:x:29:username
+video:x:44:username
+...
+
+Create '/etc/udev/rules.d/10-local-rpi.rules', to set VC device group and permissions:
+
+SUBSYSTEM=="vchiq", GROUP="video", MODE="0660"
+SUBSYSTEM=="vc-sm", GROUP="video", MODE="0660"
+SUBSYSTEM=="bcm2708_vcio", GROUP="video", MODE="0660"
+
+Then reboot:
+
+$ sudo reboot
+
+Testing (shows a rotating tiger):
+$ sudo apt install libfreetype6-dev
+
+$ cd /opt/vc/src/hello_pi
+$ sudo sh rebuild.sh
+$ export LD_LIBRARY_PATH=/opt/vc/lib
+$ ./hello_tiger/hello_tiger.bin
+
+
+### BCM2835 c library for Raspberry Pi:
+Look for the latest version (http://www.airspayce.com/mikem/bcm2835/)
+
+$ wget http://www.airspayce.com/mikem/bcm2835/bcm2835-$VERSION.tar.gz
+
+$ tar zxvf bcm2835-$VERSION.tar.gz
+$ cd bcm2835-1.36
+$ ./configure
+$ make
+$ sudo make check
+$ sudo make install
+
+## Compile
+* Complie tft_test and fb2cberry with "make"
+* Go to the root folder
+
+$ cd SW/tft_test
+$ make
+$ sudo ./tft_test	# shows some test pictures and waits for touch input (if availabe)
+
+
+$ cd SW/fb2cberry
+$ make
+$ sudo ./fb2cberry &	# copys the HDMI output to the framebuffer (around 2% cpu usage), very slow and runs in the background (because of "&")
+
+
+