User Manual

Software Design

ZSTAR3 Reference Design Manual, Rev. 0.1

5-34 Freescale Semiconductor

Preliminary

5.3.2.1 Network Number(NetNum)

The network number is save in FLASH memory of each participant with ZSTAR3 RF protocol. The USB

Stick randomly generated it at the first time of lifecycle and it can be changed by command from PC. The

new Sensor board has this number erased from manufacture and it can to update it when it received first

valid packet in ZSTAR3 RF protocol format. Network Number in sensor board can be cleared by pressed

all buttons during wake up sequency of board or it can be changed by command from USB Stick. It is used

to determine between various connections. Packets with different Network numbers are simply ignored.

This field is 16 bits long.

5.3.2.2 RX Strength

This field reports the strength of the last received packet on the other end of the connection. This value

simply tells us how well the other side receives ‘our packets’. This can be used by transmission power

management functions to change the transmission power if the other party receives packets with enough

strength.

The values reported are retrieved using the MLMELinkQuality() SMAC primitive.

This field is 8 bits long.

5.3.2.3 Zcommand

The ZSTAR demo protocol uses a few simple commands to establish and maintain the data flow between

the Sensor Board and USB stick.

The command is carried in 5.3.2.3, “Zcommand field and is 8 bits long. The commands are defined as

listed in Table 5-1., “Original ZSTAR commands Zcommand List, Table 5-2., “ZSTAR3 main commands

Zcommand List, Table 5-3., “ZSTAR3 subcommands Zcommand List.

Table 5-1. Original ZSTAR commands Zcommand List

ZCommand

code

Direction Zdata

ZSTAR_BROADCAST

‘b’ (0x62) USB stick to Sensor Board none

ZSTAR_ACK

‘a’ {0x61) USB stick to Sensor Board none

ZSTAR_CALIB

‘k’ (0x6B) USB stick to Sensor Board calibration data to Sensor Board

ZSTAR_STATUS

‘s’ (0x73) USB stick to Sensor Board g-range selection data to Sensor Board

ZSTAR_CONNECT

‘c’ (0x63) Sensor Board to USB stick calibration data from Sensor Board

ZSTAR_DATA

‘d’ (0x64) Sensor Board to USB stick

accelerometer values,

temperature and bandgap voltage,

button levels,

g-range selection