Ad1847 Codec Check And Initialization; Monitor Program Operations; Halt Loop - Analog Devices ADSP-2181 Manual

AD1847 Codec Check and Initialization

On reset, the AD1847 codec is inactive. An initialization routine initial-
izes the codec by sending a series of command words through the
interrupt. Once the commands have been sent and the
SPORT0 TX
AD1847 initialized, it begins transmitting the clock, which synchronizes
data transfers to and from the DSP. Once this bit goes "
AD1847 is ready for standard communication over

Monitor Program Operations

The monitor program runs on the EZ-KIT Lite board as part of the DSP
executable and provides the ability to download, debug, and run user pro-
grams. The VisualDSP++ debugger is the interface for the monitor
program. Using the EZ-KIT Lite as a target with the debugger lets you
operate the board remotely.
There are three main components of the monitor program:
•

"Halt loop"

• "UART ISR"
• "Command Processing"
Halt loop
The monitor program idles in the halt loop when the program is not run-
ning user code. While there, you can
registers, download programs, set breakpoints, change the UART's baud
rate, and single step through your code. To enter the halt loop from code,
you must suspend or stop the code, using either a breakpoint or a
instruction. At this point, the halt loop polls the UART. With every char-
acter received from the UART, the command-processing kernel verifies
whether a full command has been received. If a full command has been
received, the kernel processes the command; otherwise, control is returned
ADSP-2181 EZ-KIT Lite Evaluation System Manual
Using EZ-KIT LITE Software
SPORT0
and memory and
READ WRITE
", the
High
.
HALT
2-7