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STM32 bootloader материалы по теме загрузчика:

https://my.st.com/public/STe2ecommuniti ... AN2606.pdf

Написано красиво! The bootloader is stored in the internal boot ROM memory (system memory) of STM32
devices. It is programmed by ST during production. Its main task is to download the
application program to the internal Flash memory through one of the available serial
peripherals (USART, CAN, USB, etc.)

For specifications of the USART protocol used in the bootloader please refer to AN3155
http://www.st.com/web/en/resource/techn ... 264342.pdf
UART загрузка для – STM32F050x4, STM32F050x6, STM32F051x4, STM32F051x6,
STM32F051x8
– STM32F1 Mainstream
– STM32F2 Hi-performance
– STM32F302xx, STM32F303xx, STM32F313xx, STM32F372xx,
STM32F373xx, STM32F383xx
– STM32F405xx, STM32F407xx, STM32F415xx, STM32F417xx,
STM32F427xx, STM32F437xx
– STM32L1 Series

For the specification of CAN protocol used in the bootloader please refer to AN3154
http://www.st.com/st-web-ui/static/acti ... 264321.pdf
CAN загрузка для STM32F105xx, STM32F107xx, STM32F20xx, STM32F21xx,
STM32F40xx, STM32F41xx

For the specification of DFU (USB Device) protocol used in the bootloader please refer to AN3156
http://www.st.com/st-web-ui/static/acti ... 264379.pdf
USB загрузка для – STM32F105xx, STM32F107xx.
– STM32F2 Hi-performance.
– STM32F302xx, STM32F303xx, STM32F372xx, STM32F373xx.
– STM32F405xx, STM32F407xx, STM32F415xx, STM32F417xx,
STM32F427xx, STM32F437xx.
– STM32L151xC, STM32L151xD, STM32L152xC, STM32L152xD,
STM32L162xD