参数资料
型号: CC2431DK
厂商: Texas Instruments
文件页数: 29/33页
文件大小: 0K
描述: KIT DEV FOR CC2431
标准包装: 1
系列: SmartRF®
类型: 收发器,802.15.4/Zigbee
频率: 2.4GHz
适用于相关产品: CC2431
已供物品: 12 个板,12 个模块,12 根天线,线缆,文档
相关产品: CC2431ZRTCRG3-ND - CC2431ZRTCRG3
CC2431ZRTCG3-ND - CC2431ZRTCG3
296-32621-ND - IC SOC 802.15.4 SENSR NEW 48QFN
CC2431ZDK-ND - CC2431ZDK
CC2431RTC-ND - CC2431RTC
296-21980-1-ND - IC SOC IEEE 802.15.4/ZIG 48-VQFN
296-21980-2-ND - IC SOC IEEE 802.15.4/ZIG 48-VQFN
296-21940-6-ND - IC SOC 802.15.4 SENSR NET 48-QFN
296-21940-1-ND - IC SOC 802.15.4 SENSR NET 48-QFN
296-21940-2-ND - IC SOC 802.15.4 SENSR NET 48-QFN
其它名称: 296-23004
CC2431DK-ND
CC2431
indication) of the blast of broadcasts received. This message doesn’t have a body to the
message.
13.
Constants in software
This chapter describes some of the constants used in the software. These constants can be
modified to change the behavior of the location system. The constants are all defined in the
file blindnode .c .
13.1 Timing constants
All values related to timing are defined with macros.
Constant
BN_TIME_INCR
BLINDNODE_FIND_DELAY
BLINDNODE_WAIT_TIMEOUT
BLINDNODE_BLAST_DELAY
Default
value
100
20
2
20
Description
Milliseconds per time increment.
Delay between automatic location
find calculations in BN_TIME_INCR
ticks.
Delay between blasting and polling
the Reference Nodes and between
each poll in BN_TIME_INCR ticks.
Milliseconds to delay in between
each blast.
Table 3: Timing constants
Constant
BLINDNODE_MAX_REF_NODES
BLINDNODE_MIN_REF_NODES
BLINDNODE_BLAST_COUNT
Default
value
20
3
8
Description
Maximum number of Reference
Nodes to poll for the RSSI average
before selecting the best 16 and
feeding them
to the location
engine.
Minimum number of Reference
Nodes to feed to the location
engine.
Number of 1-hop broadcasts to
blast.
Table 4: Other Constants
13.2 RSSI averaging constants
The RSSI value used as input to the location engine hardware should be as accurate as
possible. Averaging of the RSSI value is used to improve the accuracy. The Blind Node blasts
a number of 1-hop broadcasts to the Reference Nodes which calculate the running average
RSSI of the received blasts. The default number of blasts to send for the averaging is shown
in the table below. It is recommended to average over 2, 4, 8 or 16 packets to avoid time
demanding division in the microcontroller. The actual value to use is a trade of between
position accuracy and update frequency / power consumption.
Constant
BLINDNODE_BLAST_COUNT
Default
value
8
Description
Number of 1-hop broadcasts to blast for
the Reference Nodes to calculate the
average.
Table 5: Number of values used in averaging
SWRU076D
Page 29 of 32
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相关代理商/技术参数
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CC2431EMK 功能描述:Zigbee/802.15.4开发工具 CC2431 Eval Mod Kit RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压:
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CC2431RTCR 功能描述:RF片上系统 - SoC CC2431 2.4 GHz Chip in Tape and Reel Pkg RoHS:否 制造商:Texas Instruments 类型:Zigbee 处理器系列:CC253 核心:8051 最大数据速率:250 Kbps 输出功率:4.5 dBm 灵敏度:- 97 dBm 工作电源电压:2 V to 3.6 V 接收供电电流:24.3 mA 传输供电电流:33.5 mA 程序存储器大小:256 KB 工作温度范围:- 40 C to + 125 C 封装 / 箱体:QFN-40
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