#define CYCLES_PER_MICROSECOND    72 

is not defined for the 407 board type, so it won't compile

Hi
I did not see your development

I now have a version that is probably better

See

https://github.com/rogerclarkmelbourne/Arduino_STM32

Hi

I installed everything as specified by the guide.
I can compile only selecting: MakerLab SUN R1(USB_To_Serial)
All other profiles generate compilation errors !!!
We can also add support for compiling for the STM32 Core?

Thanks
Drake

".../hardware/arduino" 目录下默认的 avr 板子必须设置为最后读取才能使 stm32 板子读取,暂时我的解决方案是更改目录名 "1 stm32" "2 avr" 可以读取

Lots of warnings are produced when compiling for F407

e.g.
MakerLabMe\MakerLabMe\variants\F4Discovery/libstm_stm32f40x_8Mhz_gcc_rel.a(startup_stm32f4xx.o):(.isr_vector+0x108): warning: undefined reference to TIM5_IRQHandler' \variant.cpp.o: In functionUART4_IRQHandler':
\MakerLabMe\variants\F4Discovery/variant.cpp:314: warning: undefined reference to Serial1' \variant.cpp.o: In functionUSART2_IRQHandler':
MakerLabMe\variants\F4Discovery/variant.cpp:319: warning: undefined reference to `Serial2'

These errors are compiling an empty sketch in IDE 1.6.3

GPIO_TypeDef

[#define portOutputRegister(port) ( &(port->PIO_ODSR) )

define portInputRegister(port) ( &(port->PIO_PDSR) )](https://github.com/MakerLabMe/MakerLabBoard/blob/master/cores/arduino/Arduino.h)