void RCC_Init() { RCC->CFGR |= RCC_CFGR_MCOPRE_DIV1 | RCC_CFGR_MCO_HSI48 | RCC_CFGR_PPRE_DIV1 | RCC_CFGR_SW_HSI48 | RCC_CFGR_SWS_HSI48; RCC->CR2 |= RCC_CR2_HSI48ON; while(!RCC->CR2 & RCC_CR2_HSI48RDY); }