/* Enables or disables the Internal Low Speed oscillator (LSI). LSI can not be disabled if the IWDG is running.  */
void RCC_LSICmd(FunctionalState state)
/* Enables or disables the Internal Low Speed oscillator (LSI). LSI can not be disabled if the IWDG is running.  */
void RCC_LSICmd(FunctionalState state)
{
    MODIFY_REG(RCC->CSR, RCC_CSR_LSION | RCC_CSR_LSIOENLV, RCC_CSR_LSIOENLV | (state << RCC_CSR_LSION_Pos));
}