Computer Hardware User's Guide

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9 Programming the TMS320DM642
9.1 Development and Purpose of DM642 Code
Programming the TMS320DM642
Table 6. Use of Property Sheet Controls
PROPERTY SHEETS DIALOG CONTROL WHAT DO I DO WITH IT?
When is Hardware Updated?
Read-Only Edit Box Read status information N/A
Check Box Toggle a single bit After Apply
Drop-Down List Select from a text list After Apply
Edit Box Type a number After Apply
Up/Down arrows: Immediately
Edit Box with Up/Down arrows Use up/down arrows or type a number
Type a number: After Apply
Slider Slide a lever Immediately
Pushbutton Initiate an action Immediately
Table 7. Property Sheet Button Controls
BUTTON
DEFINITION
CONTROL
OK Writes to all writeable registers whose data has changed. A register is flagged as changed if the value to be
written is different from the value last read from that address.
Closes the dialog.
Cancel Causes all changes made to the property page since the last Apply to be discarded. Changes made to dialog
controls with ‘immediate hardware update’ are not discarded, since they have already been changed in
hardware.
Does not write to hardware.
Closes the dialog.
Apply Writes to all writeable registers whose data has changed. A register is flagged as changed if the value to be
written is different from the value last read from that address.
This chapter discusses how to change settings for the TMS320DM642 on this EVM. The DM642 settings
can be controlled by using the DM642 Control Window, which is found by clicking on Tools → DM642
Control, or through the Generic I
2
C registers.
The TVP5154EVM was developed by the TI Digital Video Department, which is responsible for the
TVP5146 and TVP5150AM1 video decoders currently used on the DM642EVM released by Spectrum
Digital. The TVP5154EVM hardware and software are both based on this DM642EVM.
The TVP5154EVM was designed specifically for security customers interested in a quad video decoder.
The TVP5154EVM showcases the TVP5154 with various scaled/unscaled display modes, while making
the DM642 transparent to the customer during evaluation. This is made possible by placing the DM642
into an I
2
C slave mode and controlling the capture/display modes using virtual I
2
C registers. The entire
TVP5154EVM is controlled by a PC emulating I
2
C via the parallel port. By downloading the DM642 code
from flash at power up, it is not required to use Code Composer Studio™ software to program the DM642;
all relevant DM642 control registers can be accessed and controlled through a generic I
2
C address.
In addition to the command file provided with this EVM, additional command files to be used with TI’s EVM
control software (WinVCC) can be provided from TI to support easy programming of the TVP5154 and
DM642 registers to show the most common scaling configurations for both NTSC and PAL formats. When
using these command files or when setting the register values through a standard I
2
C bus interface, it is
important to enable and program the 5154 outputs before configuring the DM642 registers. The DM642
portion of the TVP5154EVM consists only of the DM642, SDRAM, and flash memory.
SLEU069A – February 2006 – Revised July 2006 TVP5154EVM User's Guide 25
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