SDL Development

Installation

• Launch Buildroot configuration

# make menuconfig

and choose SDL package in:

you can choose packages like SDL_Image too; then save your configuration

• Regenerate your rootfs

# make

and reflash it on your board

Configuration

Our SDL version is using the FrameBuffer interface and so it's very important to have a /etc/fb.modes file up to date with the framebuffer parameters supported by your configuration (otherwise SDL try to use the VESA parameters which may misprogram the i.MXL LCD controller).

For example for the Sharp LQ057, put in /etc/fb.modes:

mode "320x240-176"
   # D: 16.000 MHz, H: 43.836 kHz, V: 176.047 Hz
   geometry 320 240 320 240 16
   timings 62500 9 27 0 7 9 2
   rgba 5/11,6/5,5/0,0/0
endmode

By default the Armadeus LCD (Microtips) parameters are used in /etc/fb.modes.

If you want to get the parameters for your currently running LCD, then you can do:

# fbset > /etc/fb.modes

Adding Tslib (Touchscreen library) support to SDL

SDL is by default compiled with Tslib support in current Buildroot distribution. You just have to make SDL knows the presence of Tslib when launching your application (assuming you have correct Tslib envt variables set):

export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=$TSLIB_TSDEVICE
export SDL_NOMOUSE=1

Usage

• Take a look at armadeus/target/demos/armanoid/ sources in your SVN view.

• If SDL is complaining because it can't find any mouse (Unable to init SDL: Unable to open mouse) then, before launching the program, do:

# export SDL_NOMOUSE=1

Other languages:
English  •  Français