Power Policy - Texas Instruments SimpleLink Wi-Fi CC3120 Programmer's Manual

Configurations and Settings
Key Features
Power-optimized out of the box
Fast connect
14.3 Configurations and Settings
14.3.1 Changing Power Policy
Power policy is changed through the generic sl_WlanPolicySet API, as shown in
Desired Policy
Normal (default)
Low Latency
Low Power
Always On
Long Sleep
All settings of the sl_WlanPolicySet API are effective immediately after the call, and persistent between
device resets.
14.3.2 Enabling Fast Connect
Fast connect is controlled by the WLAN API (for details see
is skipped if the connection attempt is to the last connected network. Skipping the scan can save
hundreds of milliseconds in the connection time, thereby reducing the power consumption.
14.4 Network Applications and Power Consumption
14.4.1 mDNS
The device mDNS service (enabled by default) is based on sending and receiving broadcast and multicast
data frames on the connected network, without any use interaction. Because the effects of this behavior
on power consumption cannot be determined in advance, TI recommends turning this service off in power-
constrained systems (assuming it is not necessary for the application). This service will be turned off
automatically if LSI mode with a sleep time greater than 2000 ms is specified.
14.4.2 HTTP Server
The device HTTP server is automatically turned off if LSI is set to 2000 ms. This occurs because the
chances of the server to successfully accept a client connection in these conditions are extremely low.
204
Power Managment
Table 14-2. Key Features (continued)
Device is power-optimized by default. No configuration by the host is necessary to
activate these features.
Can connect to the last known network without performing a WLAN scan, which
dramatically decreases connection time and saves power.
Table 14-3. Power Policy
Type
SL_POLICY_PM SL_NORMAL_POLICY
SL_POLICY_PM SL_LOW_LATENCY_POLICY
SL_POLICY_PM SL_LOW_POWER_POLICY
SL_POLICY_PM SL_ALWAYS_ON_POLICY
SL_POLICY_PM SL_LONG_SLEEP_INTERVAL_P
OLICY
Copyright © 2017, Texas Instruments Incorporated
Description
API Parameters
Policy pVal
NULL
NULL
NULL
NULL
SlWlanPmPolicyPara
ms_t*
Chapter 4). When enabled, the scan process
SWRU455A – February 2017 – Revised March 2017
www.ti.com
Table 14-3.
ValLen
0
0
0
0
sizeof(SlWlanPmPolicyP
arams_t)
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