Simple example of initializing stm32f407 MCO output for measuring internal clock.

STM32F4_MCO
STM32F4_MCO\cmsis
STM32F4_MCO\cmsis\core_cm4.h
STM32F4_MCO\cmsis\core_cm4_simd.h
STM32F4_MCO\cmsis\core_cmFunc.h
STM32F4_MCO\cmsis\core_cmInstr.h
STM32F4_MCO\cmsis_boot
STM32F4_MCO\cmsis_boot\startup
STM32F4_MCO\cmsis_boot\startup\startup_stm32f4xx.c
STM32F4_MCO\cmsis_boot\stm32f4xx.h
STM32F4_MCO\cmsis_boot\stm32f4xx_conf.h
STM32F4_MCO\cmsis_boot\system_stm32f4xx.c
STM32F4_MCO\cmsis_boot\system_stm32f4xx.h
STM32F4_MCO\cmsis_lib
STM32F4_MCO\cmsis_lib\include
STM32F4_MCO\cmsis_lib\include\stm32f4xx_gpio.h
STM32F4_MCO\cmsis_lib\include\stm32f4xx_rcc.h
STM32F4_MCO\cmsis_lib\source
STM32F4_MCO\cmsis_lib\source\stm32f4xx_gpio.c
STM32F4_MCO\cmsis_lib\source\stm32f4xx_rcc.c
STM32F4_MCO\main.c
STM32F4_MCO\STM32F4_MCO
STM32F4_MCO\STM32F4_MCO.cogui
STM32F4_MCO\STM32F4_MCO.coproj
STM32F4_MCO\STM32F4_MCO\Debug
STM32F4_MCO\STM32F4_MCO\Debug\bin
STM32F4_MCO\STM32F4_MCO\Debug\bin\history.xml
STM32F4_MCO\STM32F4_MCO\Debug\bin\STM32F4_MCO.bin
STM32F4_MCO\STM32F4_MCO\Debug\bin\STM32F4_MCO.elf
STM32F4_MCO\STM32F4_MCO\Debug\bin\STM32F4_MCO.hex
STM32F4_MCO\STM32F4_MCO\Debug\bin\STM32F4_MCO.map
STM32F4_MCO\STM32F4_MCO\Debug\obj
STM32F4_MCO\STM32F4_MCO\Debug\obj\dependencies.xml
STM32F4_MCO\STM32F4_MCO\Debug\obj\history.xml
STM32F4_MCO\STM32F4_MCO\Debug\obj\main.o
STM32F4_MCO\STM32F4_MCO\Debug\obj\startup_stm32f4xx.o
STM32F4_MCO\STM32F4_MCO\Debug\obj\stm32f4xx_gpio.o
STM32F4_MCO\STM32F4_MCO\Debug\obj\stm32f4xx_rcc.o
STM32F4_MCO\STM32F4_MCO\Debug\obj\system_stm32f4xx.o
STM32F4_MCO\STM32F4_MCO\STM32F4_MCO.elf.xcodeproj
STM32F4_MCO\STM32F4_MCO\STM32F4_MCO.elf.xcodeproj\project.pbxproj

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