howto_bf561.txt

BlackFin处理器视频演示代码

+++ How to use the Video Extender Board with a BF561 Core Module +++

First of all, when applying the CM-BF561 make sure switches
S4 and S5 are set as follows:
   S4 = 1
   S5 = 1

Each Ext-Video board has one analog-video decoder and one 
encoder. When applying the CM-BF561 the Ext-Video board supports 
two different modes:

Mode 1: The port and clock lines of decoder and encoder are
        directly linked together, so the video source attached
        to the video input of the board is directly displayed
        at the outputs entirely omitting the processor. However
        the processor can still capture the video input signal.
        To set up this mode set switches S1, S2 and S3 as 
        follows:
           S1 = |0|0|1|0|				on board V1.0
           S1 = 1 on all other off		on board V1.1
           S2 = all OFF
           S3 = all ON

Mode 2: The decoder is connected with its port and clock lines
        to the Blackfin's PPI1 port, the encoder to the PPI2
        port. The processor can capture video input and generate
        video output simultaneously and independently.
        To set up this mode set switches S1, S2 and S3 as 
        follows:
           S1 = |1|1|0|0|				on board V1.0
           S1 = 2,3 on all other off	on board V1.1
           S2 = all ON
           S3 = all OFF

The example application included can operate on Mode 2 in two
different ways (Comment/uncomment the according sections in 
video_example.c to choose one):
 + Loop through: Buffer incoming video and display it immediately
                 on output. *
 + Testpicture: Display the standard test picture contained in 
                testpic.c. or a test screen with red and blue stripes **

*) Note: These modes require a video source to be connected as
   input. The software will automatically determine, which video
   input the source is connected to. However analog video is not 
   intended to be hot-pluggable, so it's not recommended to attach
   or remove live input plugs while the processor is running.

**)Do not try and open testpic.c in the VisualDSP++ embedded 
   editor. The file is about 8MB large and might hang the IDE 
   when opened.

Note: During operation all three video output sockets (SVideo-OUT,
CVBS0-OUT and CVBS1-OUT) are active and output the same video 
signal.