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AN3155 Application note - STMicroelectronics

February 2022AN3155 Rev 151/481AN3155 Application noteUSART protocol used in the STM32 bootloader IntroductionThis Application note describes the USART protocol used in the STM32 microcontroller bootloader, providing details on each supported document applies to STM32 products embedding any bootloader version, as specified in Application note AN2606 STM32 system memory boot mode, available on These products are listed in Ta b l e 1, and are referred to as STM32 throughout the more information about the USART hardware resources and requirements for your device bootloader, refer to the already mentioned AN2606.

The Get command allows the user to get the version of the bootloader and the supported commands. When the bootloader receives the Get command, it transmits the bootloader version and the supported command codes to the host, as shown in . Figure 2. Figure 2. Get command: host side. Send 0x00 + 0xFF Start Get Wait for ACK or NACK Receive the ...

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