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https://bravikov.wordpress.com/2016/02/21/%d0%bd%d0%b0%d1%87%d0%b0%d0%bb%d0%be-%d1%80%d0%b0%d0%b1%d0%be%d1%82%d1%8b-%d1%81-stm32-%d0%b2-keil-mdk-arm/
Начало работы с STM32 в Keil MDK-ARM