CAN bootloader AN2662
60/83 Doc ID 14156 Rev 1
Figure 45. Write Protect command via CAN: device side
1. WP = Write Protect
The STM32F105xx and STM32F107xx sends the messages as follows:
ACK message: Std ID = 0x43, DLC = 1, data[0] = ACK if the content of the command is
correct and ROP is not active else data[0] = NACK.
3.13 Write Unprotect command
The Write Unprotect command is used to disable the write protection of all the Flash
memory sectors. When the bootloader receives the Write Unprotect command, it transmits
the ACK message to the host if ROP is disabled else it transmits NACK. After the
transmission of the ACK message, the bootloader disables the write protection of all the
Flash memory sectors.
At the end of the Write Unprotect command, the bootloader transmits the ACK message and
generates a system Reset to take into account the new configuration of the option byte.
2ECEIVETHESECTORCODESANDTHE
.O
AI
3TART70
2ECEIVEDMESSAGE
3END!#+MESSAGE
3END.!#+MESSAGE
%NDOF70
9E S
9E S
NUMBEROFSECTORSTOBEPROTECTED
7RITEPROTECTTHEREQUESTEDSECTORS
3END!#+MESSAGE
'ENERATESYSTEMRESET
WITHSTD)$
X
2/0INACTTIVE
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