Analog Devices ee-92 Application Notes

Engineer To Engineer Note EE-92

Technical Notes on using Analog Devices’ DSP components and development tools

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Setting Up Streams with the ADSP­2100 Family Debugger - Release 6.0

This procedure is based on one of the examples
that comes with the ADSP-21xx software
(Example 2 - can be found in C:\Program

Files\Analog Devices\VisualDSP\21xx\

Examples\Example2). This program is a talkthru

program that simply passes data through the serial
ports. The DSP receives a value in SPORT1, then
transmits it through SPORT1. The main part of the
program is an infinite loop that waits for the
SPORT1 receive interrupt to occur. The interrupt
service routine performs all data processing (in this
example, transferring data from the SPORT receive
register to the SPORT transmit register).

For simulation purposes, input and output files will
be used as inputs and outputs to the serial port.
The file, serin.dat provides the input for the
serial port. The debugger creates the file
serout.dat and stores the output of the
SPORT in this file.

This example is also documented in Chapter 7 of
the ADSP-2100 Family Assembler Tools &
Simulator Manual (page 7-25).

Procedure for setting up this example in the
Debugger

1. Assemble and link your code to create an
executable.

2. Open up the Debugger and select a new

session with an ADSP-2101 target.

3. Load your executable into the Debugger and

click on DEBUGà RESET to simulate code
bootup.

4. Go to SETTINGSàSTREAMS. This will

bring up the Streams dialog box. Make the
following selections:

a. Under Source (Debug Target) select

SPORT 1 as your device.

b. Next, fill in the destination file

associated with SPORT 1. Under
Destination (File) enter ‘serout.dat’ (or
whatever name you choose for the
output).

c. Change the format to binary.
d. Click on Connect. These steps have

configured the output stream.

e. Now, for the input stream, go back to

Source (File). Browse to select the file,
‘serin.dat’ which should be in the

C:\Program Files\Analog
Devices\Visual

Dsp\Examples\Example2 directory.

f. Change the format to binary.
g. Go back to Destination (Debug

Target). Select SPORT 1 as your
device.

h. Click on Connect. These steps have

configured the input stream.

i. Check the ACTIVE streams to make

sure your selections were set correctly.

j. Click on OK to close the Streams

Dialog Box.

5. Jump to location 0x0029 in the program and

change the value 0x6b27 to 0x6a27 to enable
the SPORT.

a

6. Set up the debugger to generate an RFS1

interrupt every 200 cycles by going to
SETTINGSà INTERRUPTS and selecting
RFS1 (under External Interrupts) and entering
200 for the min and max cycles.

7. Run the program.

8. In a few seconds, you should see an error box

come up that says

Failed to read from device:

FILE (C:\Program Files\Analog
Devices\Visual
DSP\21xx\Examples\Example2\Serin.dat, Binary)

Note: This means that the Debugger has reached
the end of the file. Check the contents of your
output file to determine if the talkthru simulation
executed properly. You should see the same values
in serout.dat as those in serin.dat.

EE-92 Page 2

Technical Notes on using Analog Devices’ DSP components and development tools

Phone: (800) ANALOG-D, FAX: [phone], FTP: ftp.analog.com, EMAIL: [e-mail]