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Код: Выделить всё

  /* Start HSI and connect SysClk to HSI. HSI = 16 MHz */
	RCC_HSICmd( ENABLE );	   
	while (RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);		 				 
	RCC_SYSCLKConfig (RCC_SYSCLKSource_HSI); 	
  while (RCC_GetSYSCLKSource() != 0x04 );	
	/* PLL Config */

	RCC_PLLConfig(RCC_PLLSource_HSI,  
                 RCC_PLLMul_6,  
                 RCC_PLLDiv_4  
                                );	
	RCC_PLLCmd  ( ENABLE );	  	
	while (RCC_GetFlagStatus( RCC_FLAG_PLLRDY ) == RESET);	  	
	/* Enable Clock to GPIO A (USB is connected here)*/ 
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, 
                     		 ENABLE  
                                       ) ;
   /* USB clock enable */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE); 
	 /* Enable clock to SYSCFG */ 
	 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);	  

Код: Выделить всё

RCC->CFGR |= (uint32_t) RCC_CFGR_HPRE_DIV2;