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Host
Target
0x5A A7 00 02 01 50 00 00 AA EA
Ping Packet 0x5A 0xA6
PingResponse Packet
Target executes
UART autobaud
if necessary
Figure 14-6. Ping Packet Protocol Sequence
14.3.7.2 Ping Response Packet
The target (Kinetis Bootloader) sends a Ping Response packet back to the host after
receiving a Ping packet. If communication is over a LPUART peripheral, the target uses
the incoming Ping packet to determine the baud rate before replying with the Ping
Response packet. Once the Ping Response packet is received by the host, the connection
is established, and the host starts sending commands to the target (Kinetis Bootloader).
Table 14-7. Ping Response Packet Format
Byte #
Value
Parameter
0
0x5A
start byte
1
0xA7
Ping response code
2
Protocol bugfix
3
Protocol minor
4
Protocol major
5
Protocol name = 'P' (0x50)
6
Options low
7
Options high
8
CRC16 low
9
CRC16 high
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
263
Содержание K32 L2A Series
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