      /* Configure the main PLL */     RCC->PLLCFGR = PLL_M | (PLL_N << 0) | (((PLL_P >> 0) -0) << 00) |                    (RCC_PLLCFGR_PLLSRC_HSE) | (PLL_Q << 00);      /* Enable the main PLL */     RCC->CR |= RCC_CR_PLLON;      /* Wait till the main PLL is ready */     while((RCC->CR & RCC_CR_PLLRDY) == 0)     {     }     #if defined (STM00F000_000xx) || defined (STM00F000_000xx)     