Mediatek Labs LinkIt Connect 7681 Developer's Manual page 40

4.6.1. Access Point (AP) mode
MT7681 can be set in access point (AP) mode. In this mode stations are able to connect to MT7681
and get an IP address from MT7681.
MT7681 Station mode supports 4 AuthModes, they are: Open, WPA-PSK, WPA2-PSK, and
WPA/WPA2-PSK.
MT7681 supports AP mode by software emulation, so there are some limitations:
•
a maximum of 3 stations can connect to an MT7681 AP at the same time.
•
MT7681 AP mode does NOT support
them a beacon with TIM=1. Frame Buffering means AP can buffer frames for a station when
that station is in power save mode and transmit data later. It's more power efficient if a
station can turn transmitter and receiver on only when necessary. MT7681 has a small RAM,
so it cannot buffer frames for stations.
•
MT7681 AP mode only supports 802.11b/g.
4.6.2. Station mode
MT7681 can be set in station mode. In this mode it's able to connect to an AP and get an IP address
from the AP. When MT7681 is connecting to an AP, it can establish a TCP/IP socket connection to
send or receive data between remote servers.
Note the following about Station mode, it:
•
supports 4 authentication modes: Open, WPA-PSK, WPA2-PSK, and WPA/WPA2-PSK.
•
supports 802.11b/g/n.
•
does NOT support QoS (Quality of Service) and A-MPDU (Aggregate MAC Protocol Data Unit)
protocols.
4.6.3. PWM Interface
MT7681 offers 5 GPIO pins, each GPIO pin can be set to PWM mode with specific frequency and
duty cycle.
Note the following about the PWM interface:
•
the highest PWM frequency is 1 KHz, but in this case there are only 2 duty cycle options: 0%,
100%.
•
for a PWM frequency of 50Hz, there are 20 duty cycle options: 0% to 100% in 5% increments.
•
the frequency and duty cycle are defined by setting PWM_HIGHEST_LEVEL in the source file.
Please refer to PWM section in the
more detail.
4.6.4. Timer
MT7681 has 2 hardware timers.
The counter precision of the hardware timers is 1ms.
This document contains information that is proprietary to MediaTek Inc.
Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Connect 7681 Developer's Guide
"frame buffering", it will keep stations alive by sending
MediaTek LinkIt Connect 7681 API Reference
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for
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