Overclocking

CPU Speed can be increased form 72 to 120 MHz and increase the update frequency to nearly 5 kHz. Modifying the below 2 files will allow you to select 120 MHz from the Arduino IDE Tools menu.

A module running 72 MHz will have a temperature of about 65C. At 120 MHz this increases to 70C.

I will continue to overclock a module and report back here with any failures.

• Open STM32F1/boards.txt and scroll down to line 330, or search for "Generic STM32F103C".

• https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/master/STM32F1/boards.txt#L330

• Insert the below lines.

genericSTM32F103C.menu.cpu_speed.speed_120mhz=Overclocked 120Mhz

genericSTM32F103C.menu.cpu_speed.speed_120mhz.build.f_cpu=120000000L

• Open STM32F1/variants/generic_stm32f103c/wirish/boards_setup.cpp and scroll to line 50.

• https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/master/STM32F1/variants/generic_stm32f103c/wirish/boards_setup.cpp#L50

• Insert the below lines.

#elif F_CPU==120000000

#define BOARD_RCC_PLLMUL RCC_PLLMUL_15