howto_bf537.txt

BlackFin处理器视频演示代码

+++ How to use the Video Extender Board with a BF537 Core Module +++

First of all, when applying the CM-BF537 make sure switches
S4 and S5 are set as follows:
   S4 = 1
   S5 = 0

Each Ext-Video board has one analog-video decoder and one 
encoder. When applying the CM-BF537 the Ext-Video board supports 
two different modes:

Mode 1: The decoder is connected to the Blackfin's PPI port, which
        should be configured as input. The incoming signal can be
        captured and processed by the DSP. To set up this mode set 
        switches S1, S2 and S3 as follows:
           S1 = all off
           S2 = all OFF
           S3 = all OFF

Mode 2: The encoder is connected with its port and clock lines
        to the Blackfin's PPI port, which should be configured 
        as output. The processor can generate video which is
        encoded as analogous signal. To set up this mode set 
        switches S1, S2 and S3 as follows:
           S1 = |0|1|1|0| 				on board V1.0
           S1 = 1,2 on all other off	on board V1.1
           S2 = all OFF
           S3 = all ON

The example application included can operate on Mode 2 in three
different ways (Comment/uncomment the according sections in 
video_example.c to choose one):
 + Capture: Capture input video and store it in memory. *

 + Testpicture: Display the standard test picture contained in 
                testpic.c. or a test screen with red an 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.