Reference Manual

Redpine Signals, Inc. Proprietary and Confidential Page 85
RS9116 n-Link Linux and Android
Technical Reference Manual
Version 2.0
other sleep duration parameters that follow (<num_beacons_per_listen_interval>, <dtim_interval_duration>,
<num_dtims_per_sleep>). The maximum duration for which the device supports sleep is 4095 times the duration of
the beacon interval considering the listen interval parameters of the access point. The maximum value for this
parameter can be 65535, but the duration should be the deciding factor in the beacon interval of the access point.
This parameter is considered only after the module is connected to the access point. For example, if the beacon
interval of the AP is 100ms and listen interval of AP is 8 beacons, then the maximum time the device can sleep
without any data loss is 800 ms (8 * 100). Hence, the listen_interval_duration can be up to 800ms.
• <num_beacons_per_listen_interval>: This parameter specifies the number of beacon intervals for which the module
sleeps in the connected state power save modes. Here, the device will wake up for the nth beacon, where n is the
listen interval value programmed by the user. If a non-zero value is assigned to this parameter it takes precedence
over the other sleep duration parameters that follow (<dtim_interval_duration>, <num_dtims_per_sleep>). This
parameter is used only when the above parameter is assigned to 0. The maximum value for this parameter is 4095.
The value for this parameter also has to be chosen keeping in mind the listen interval of the access point. . This
parameter is considered only after the module is connected to the access point.
• <dtim_interval_duration>: This parameter specifies the duration (in milliseconds) for which the module sleeps in the
connected state power save modes. The device will wake up for the nearest DTIM beacon after the time which the
user has programmed expires. This parameter can be used when DTIM information is not available. If a non-zero
value is assigned to this parameter, then it takes precedence over the other sleep duration parameter that follows
(<num_dtims_per_sleep>). This parameter is used only when the above parameters are assigned 0. The maximum
value for this parameter can be 10000ms. This parameter is considered only after the module is connected to the
access point.
• <num_dtims_per_sleep>: This parameter specifies the number of DTIM intervals for which the module sleeps in the
connected state power save modes. This parameter has least priority compared to the ones above and is used only if
the above parameters are assigned to 0. The maximum value for this parameter is 10. This parameter is considered
only after the module is connected to the access point.
The LP and ULP Power Save modes are supported with SDIO interface. USB interface supports only LP Power Save
mode
15.5 Procedure to enable device power save for USB interface
In order to enable power save for USB interface, following steps must be followed after enabling LP power save on USB
interface.
Find where the RSI module got detected.
Eg: When RSI module is inserted, following prints are observed when dmesg is done.
usb 2-1: new high-speed USB device number 4 using ehci-pci
usb 2-1: New USB device found, idVendor=1618, idProduct=9113
usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
usb 2-1: Product: Wireless USB Network Module
usb 2-1: Manufacturer: Redpine Signals, Inc.
usb 2-1: SerialNumber: 000000000001
It means Redpine module is detected as 2-1 device. Please make a note of this.