AvaLAN Wireless AW900mSPI-10 - Manual (Page 24)

AW900mSPI User’s Manual
PAGE 24 Technical support (650) 384-0000 www.avalanwireless.com
microcontroller is responsible for avoiding overflow.
setPacket SPI Mode: 0x8A UART Mode: 0x89
b7 b6 b5 b4 b3 b2 b1 b0
Byte 1 BC ID6 ID5 ID4 ID3 ID2 ID1 ID0
Byte 2 S7 S6 S5 S4 S3 S2 S1 S0
Byte 3 - - - - - S10 S9 S8
Byte 4 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0
...
Byte 4 is repeated until all the data is sent.
BC is the Broadcast Flag. BC = 1 means send the packet to all Subscriber Units.
BC = 0 means send the packet only to the Device ID specified in the rest of Byte 1.
ID0 to ID6 is the 7-bit integer Device ID of the Subscriber Unit that is to receive
the data. Note that if BC = 1 and there is a non-zero Device ID specified, then all
Subscribers but the one specified will receive the data.
S0 to S10 is the 11-bit integer size of the Data packet in bytes (number of data bytes
being sent).
Reset Command
The setReset command is used to reset the XC1220 and can be issued at any time
durning normal operation. After a reset has been issued the XC1220 takes approxi-
mately 300 ms to restart. After restart all previously configured data (Public and
Private Keys, Device ID and type) will be lost.
setReset SPI Mode: 0x85 UART Mode: 0x84
There are no other bytes required to reset the device. The host microcontroller
should simply issue the setReset command.
Firmware Upgrading
If an update of the AW900mSPI’s firmware becomes desirable, a new firmware im-
age will be supplied by AvaLAN. If a USB interface exists, such as that used in the
EVAL board and recommended for UART applications, then the firmware upgrade
will be handled by a software utility provided by us. If the AW900mSPI is used in SPI
mode and you wish to build firmware update into your host microcontroller’s code,