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SX1211SK868/915 User Guide
4.3
SX1211SK – FUNCTIONAL FLOW CHART
Power ON
Yes
Ping Pong
Test
Enabled ?
Yes
Default
Ping Pong
Enabled ?
No
No
No
PC
attached
?
Yes
Default
Ping Pong
Test
User
Ping Pong
Test
No
Stand-
Alone
Evaluation
Power
Perform
PC GUI
command
OFF ?
Figure 4.1: “Embedded software” general flow chart
Brief explanation of Figure 4.1
?
?
4.4
If the PC is attached to the processor board, the embedded microcontroller software will monitor
the RS232 port for a valid user request from the PC GUI software. Acceptance and execution of
a request is indicated by the “blinking” of both yellow LEDs Rx and Tx together.
If the PC is not attached, the SX1211SK will assume “SX1211 Evaluation” mode if the user has
disabled the Ping-Pong Test, otherwise the “embedded software” will check if the user has
defined a “User Ping-Pong Test” if not the microcontroller will assume the “Default Ping-Pong
Test”.
DEFAULT PING-PONG TEST
4.4.1 Purpose
The Ping-Pong Test provides the user a means to demonstrate practical two-way radio
communications between two processor boards with SX1211 RF modules attached. The Ping Pong
mode can be a valuable test facility when conducting on-site and range tests.
A Default Ping Pong Test program is embedded within a SEMTECH RISC microcontroller chip
(XE88LC05) on the board. The Ping Pong Test ( Default or User ) is automatically started after the
power up if no PC is attached to the board’s RS232 connector and if the option has not been disabled
from the PC-GUI Software.
Rev1.1
13 of 30
www.semtech.com
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