AN3154 datasheet(10/34 Pages) STMICROELECTRONICS

10 / 34 page

Bootloader command set

AN3154

10/34

DocID017063 Rev 5

The host sends messages as follows:

Command message: Std ID = 0x00, data length code (DLC) = ‘not important’.

Figure 5. Get command: device side

The STM32 sends messages as follows:

Message 1: Std ID = 0x00, DLC = 1, data = 0x79 - ACK

Message 2: Std ID = 0x00, DLC = 1 data = N = 12 = the number of bytes to be sent -1

≤N +1 ≤256)

Message 3: Std ID = 0x00, DLC = 1, data = bootloader version (0 < version

≤255)

Message 4: Std ID = 0x00, DLC = 1, data = 0x00 - Get command

Message 5: Std ID = 0x00, DLC = 1, data = 0x01 - Get Version & Read Protection

Status command

Message 6: Std ID = 0x00, DLC = 1, data = 0x02 - Get ID command

Message 7: Std ID = 0x00, DLC = 1, data = 0x03 - Speed command

Message 8: Std ID = 0x00, DLC = 1, data = 0x11 - Read memory command

Message 9: Std ID = 0x00, DLC = 1, data = 0x21 - Go command

Message 10: Std ID = 0x00, DLC = 1, data = 0x31 - Write memory command

Message 11: Std ID = 0x00, DLC = 1, data = 0x43 - Erase memory command

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