2014-12-19 21:08:59 +01:00
|
|
|
README.txt
|
|
|
|
|
==========
|
|
|
|
|
|
|
|
|
|
STM32F429I-DISCO LTDC Framebuffer demo example
|
|
|
|
|
|
|
|
|
|
Configure and build
|
|
|
|
|
-----------------------------------------------
|
|
|
|
|
cd tools
|
|
|
|
|
./configure -a <appdir> stm32f429i-disco/ltdc
|
|
|
|
|
cd ..
|
|
|
|
|
make
|
|
|
|
|
|
2015-04-16 16:57:08 +02:00
|
|
|
Note!
|
|
|
|
|
In the current implementation the DMA2D driver only supports clut pixel format
|
|
|
|
|
if the LTDC driver it does. Otherwise it will not be compatible with the nx
|
|
|
|
|
framework. If CONFIG_FB_CMAP is configured, nx expects that any pixel format
|
|
|
|
|
supports color lookup tables. This is also the case for non CLUT formats e.g.
|
|
|
|
|
FB_FMT_RGB16_565. This may result in wrong color representation by nx if the
|
|
|
|
|
pixel format is unequal to FB_FMT_RGB8.
|
|
|
|
|
|
|
|
|
|
On the other hand layers with CLUT pixel format are not supported by the DMA2D
|
|
|
|
|
controller, in the case they will be used as destination layer for the following
|
|
|
|
|
operations:
|
|
|
|
|
- blit
|
|
|
|
|
- blend
|
|
|
|
|
- fillarea
|
|
|
|
|
|
|
|
|
|
To enable clut support in both LTDC and DMA2D driver the following
|
|
|
|
|
configurations are valid:
|
|
|
|
|
|
|
|
|
|
1.
|
|
|
|
|
- Enable LTDC_INTERFACE and LAYER1/LAYER2
|
|
|
|
|
- Layer1 FB_FMT_RGB8
|
|
|
|
|
- Layer2 any non clut format
|
|
|
|
|
|
|
|
|
|
But Layer2 can only be used as destination layer for dma2d operations above.
|
|
|
|
|
This configuration is not compatibly to nx because LAYER2 will be referenced
|
|
|
|
|
by up_fbgetvplane and is an invalid CLUT pixel format.
|
|
|
|
|
|
|
|
|
|
2.
|
|
|
|
|
- Enable LTDC_INTERFACE and LAYER1/LAYER2
|
|
|
|
|
- Layer2 FB_FMT_RGB8
|
|
|
|
|
- Layer1 any non clut format
|
|
|
|
|
|
|
|
|
|
But Layer1 can only be used as destination layer for dma2d operations above.
|
|
|
|
|
This configuration should be compatibly to nx because LAYER2 will be referenced
|
|
|
|
|
by up_fbgetvplane and is an valid CLUT pixel format.
|
|
|
|
|
|
|
|
|
|
All other non clut configuration work fine.
|
|
|
|
|
|
|
|
|
|
If using the DMA2D controller without the LTDC controller e.g. camera interface
|
|
|
|
|
than enable CONFIG_FB_CMAP and optional CONFIG_FB_TRANSPARENCY in your board
|
|
|
|
|
specific configuration.
|
|
|
|
|
|
|
|
|
|
|
2014-12-19 21:08:59 +01:00
|
|
|
Loading
|
|
|
|
|
-----------------------------------------------
|
|
|
|
|
st-flash write nuttx.bin 0x8000000
|
|
|
|
|
|
|
|
|
|
Executing
|
|
|
|
|
-----------------------------------------------
|
|
|
|
|
The ltdc is initialized during boot up.
|
|
|
|
|
Interaction with NSH is via the serial console at 115200 8N1 baud.
|
|
|
|
|
From the nsh comandline execute one (or both) of the examples:
|
|
|
|
|
- nx (default nx example)
|
|
|
|
|
- ltdc (trivial ltdc interface test)
|
2015-04-16 16:57:08 +02:00
|
|
|
|
|
|
|
|
Note! The ltdc example ends in an infinite loop. To get control of the nsh
|
|
|
|
|
start this example in the background with 'ltdc &'.
|
|
|
|
|
|
