/* ADC Setup the A/D Clock. 
The ADC's have a common clock prescale setting. */
void rcc_set_adcpre(uint32_t adcpre)
/* ADC Setup the A/D Clock. 
The ADC's have a common clock prescale setting. */
void rcc_set_adcpre(uint32_t adcpre)
{
	RCC_CFGR = (RCC_CFGR & ~RCC_CFGR_ADCPRE) |
			(adcpre << RCC_CFGR_ADCPRE_SHIFT);
}