AN3154 datasheet(22/34 Pages) STMICROELECTRONICS

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Bootloader command set

AN3154

22/34

DocID017063 Rev 5

Figure 17. Write memory command: device side

The STM32 sends messages as follows:

ACK message: Std ID = 0x31, DLC = 1, data[0] = ACK if the content of the command is

correct else data[0] = NACK

ROP inactive?

Receive the ’data messages’ and

temporarily write the data to RAM

Yes

Start write memory

Yes

Received message

Send ACK message

End of write memory

Yes

Send NACK message

If a message is corrupted

Write the received data to RAM

from the start address

Write the received data to RAM

from the start address

Write the received data to RAM

from the start address

ai15719b

Address in Flash ?

Address valid?

Write the received data to the

memory from the start address

Yes

Address in RAM ?

Write the received data to RAM

from the start address

Write the received data to RAM

from the start address

Write the received data to RAM

from the start address

Yes

Address= 0x1FFF F800 ?

Write the Keys for Option byte

area access

Write the received data to Option

area access from start address

Send ACK message

Generated system reset

with stdID

= 0x31?

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