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how to allow the clock to be output onto the external MCO pin

Question asked by gharib.yasamin on May 6, 2015
Latest reply on May 15, 2015 by Amel N
I want to have a sample of system clock at MCO pin of STM32F107RC micro controller.
I use dspin firmware library for driving stepper motor.
The on board crystal is 8MHz and system clock set to be 72MHz.
I add this code to "dspin.c":
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

and I add the below line code in "SetSysClockTo72()" function at "system_stm32f10x.c" file.
RCC->CFGR &= (uint32_t)0xF6FFFFFF;   //HSE clock selected as MCO source

But I don't have no clock output on this pin.

please guide me