STM32W108B-SK STMicroelectronics, STM32W108B-SK Datasheet - Page 3

• Manufacturer Part Number: STM32W108B-SK
• Description: STARTER KIT FOR STM32W108
• Manufacturer: STMicroelectronics
• Series: STM32r
• Type: MCUr

Specifications of STM32W108B-SK

• Featured Product: STM32 Cortex-M3 Companion Products
• Contents: Board
• Silicon Manufacturer: ST Micro
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: STM32
• Silicon Family Name: STM32W108xx
• Kit Contents: Board
• Features: IEEE
• Mfg Application Notes: STM32W108 Adjacent Channel Rejection Measurements
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN3262
2
Communication protocol
A bootloading session consists of exchanges of commands codes and related data between
bootloader device (target) and host (transmitter) nodes. The protocol chosen for this
purpose is the same one as specified in application note AN3155 for STM32 USART
bootloader; its commands are a subset of those specified. The command set is further
described in the next section. The replacement of USART (universal
synchronous/asynchronous receiver/transmitter) with the 802.15.4 standard for point-to-
point transmission of bits over the air, implies the deployment of all the well-known features
to cope with lossy channels such as CRC check, MAC level ACK detection and packet
retries in addition to all the functions that the (higher level) protocol provides to improve the
reliability of communication as described in the next section.
Commands and data are sent in the 802.15.4 payload which is variable in size according to
the specific information to be sent. 802.15.4 packets can be sent unicast and broadcast.
Broadcast packet are supported by a subset of commands and they are useful to discover
nodes in bootloader mode.
Figure 2
Figure 2.
Figure 3
Figure 3.
The communication channel (between channels 11 and 26) and the PAN ID can be freely
chosen by the application before it launches the bootloader. In the case, where the
bootloader is not started by the application, it will run on a default channel (15) and default
bootloader PAN ID 0xB00B.
0x61 0xCC
0x01 0xC8
(2 bytes)
(2 bytes)
Control
Control
Frame
Frame
shows the selected format for a unicast 802.15.4 packet.
shows the selected format for a broadcast 802.15.4 packet.
802.15.4 packet format for unicast packet transmission
802.15.4 packet format for broadcast packet transmission
Sequence
Sequence
Number
Number
(1 byte)
(1 byte)
Destination
Destination
(2 bytes)
(2 bytes)
0xFFFF
Pan ID
Pan ID
Doc ID 17845 Rev 2
Destination
Destination
(8 bytes)
(2 bytes)
Address
0xFFFF
EUI64
Short
(8 bytes)
(8 bytes)
Source
Source
EUI64
EUI64
Communication protocol
(variable)
(variable)
Payload
Payload
(2 bytes)
(2 bytes)
FCS
FCS
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