User`s manual

AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Page 38
DVSI Confidential Proprietary
Operation
Figure 22 LoopBack UART Mode AMBE-3000™ Vocoder Chip (UART Interface)
LoopBack Mode Command Example
C:\ Command Prompt
- ’ X
hdkcom.exe –port COM4 460800 –uart or –ppt –r <rate index or rate words
in hex> –mode loopback
where:
-port COM4 is the PC’s COM port that the HDK communicates on as indicated by Windows
Device Manger
460800 is the baud rate of the PC connection
-ppt sets the HDK to use the PPT Interface of the AMBE-3000™ Vocoder chip
or
-uart sets the HDK to use the UART Interface of the AMBE-3000™ Vocoder chip
If neither –ppt or –uart is specified the PPT interface is used by default.
-r is the rate index of the bit rate the file is to be decoded at. See Table 23 Standard Rate Table
for AMBE-3000. To use rate words to set the rate – the format must be six words in hex separated
by a space as shown in the following example:
-r 0x0460 0x0986 0x0000 0x0000 0x0000 0x5660
-mode loopback is to set the board into Loopback Mode
Note: Once the HDK is set to Loopback Mode it will stay in this mode until another command is issued
to put it into another mode. It is recommended to always switch back into Idle Mode before switching in
between modes.