Coma FW-C2800 User's Guide download pdf (Page 104)

Real-Time Data Exchange

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3.7.4 RTDX Modes

The RTDX host library provides the following modes of receiving data from a

target application:

❏ Non-continuous. The data is written to a log file on the host.

Noncontinuous mode should be used when you want to capture a finite

amount of data and record it in a log file.

❏ Continuous. The data is simply buffered by the RTDX host library; it is

not written to a log file. Continuous mode should be used when you want

to continuously obtain and display the data from a DSP application, and

you don't need to store the data in a log file.

Note:

To drain the buffer(s) and allow data to continuously flow up from the target,

the OLE automation client must read from each target output channel on a

continual basis. Failure to comply with this constraint may cause data flow

from the target to cease, thus reducing the data rate, and possibly resulting

in channels being unable to obtain data. In addition, the OLE automation

client should open all target output channels on startup to avoid data loss

to any of the channels.

3.7.5 Special Considerations When Writing Assembly Code

The RTDX functionality in the user library interface can be accessed by a

target application written in assembly code.

See TMS320C54x Optimizing Compiler User’s Guide, TMS320C55x

Optimizing Compiler User’s Guide, or TMS320C6000 Optimizing Compiler

User’s Guide for information about the C calling conventions, run-time

environment, and run-time-support functions applicable to your platform.

3.7.6 Target Buffer Size

The RTDX target buffer is used to temporarily store data that is waiting to be

transferred to the host. You may want to reduce the size of the buffer if you

are transferring only a small amount of data. Alternately, you may need to

increase the size of the buffer if you are transferring blocks of data larger than

the default buffer size.

Using the Configuration Tool you can change the RTDX buffer size by right-

clicking on the RTDX module and selecting Properties.

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Coma FW-C2800 User's Guide Page 104