#include "msp430fg4618.h"

void ADC_init(void);
void Clock_init(void);

unsigned int sample;

void main (void){

    WDTCTL = WDTPW | WDTHOLD; 

    ADC_init();
    
    for(;;){
        ADC12CTL0 |= ADC12SC;                   // Start conversions
   	while (!(ADC12IFG & 0x8000));           // Conversion done?
    	sample = ADC12MEM15;
    }

}

void ADC_init(void){

unsigned int i;
	
   	/* Configure ADC12 */
	P10SEL |= BIT6;                         // Enable A/D channel A0
    	ADC12CTL0 &= ~ENC;                      // Enable conversions

    	ADC12CTL0 = ADC12ON + SHT1_2 + REFON + REF2_5V;
    	ADC12CTL1 = SHS_0 + CONSEQ_2 + CSTARTADD_15;           

	ADC12MCTL15 = INCH_15 + SREF_1;
    
	for (i = 0x3600; i; i--);               // Delay for needed ref start-up.
                                            	// See datasheet for details.
    
   	ADC12CTL0 |= ENC;                       // Enable the ADC   

}

void Clock_init(void){

   /*
   Set System Clock Frequency to (121+1) * 32786 * 2 = 7.995392Mhz
   This freq. allows for 2400 - 230400 bit rate UART operation with less than 0.86% error
   */
   FLL_CTL0 = (DCOPLUS | XCAP14PF);       //Enable Frequency Multiplier (DCO+) and XIN/XOUT caps to 14pF
   SCFI0 = (FLLD_2 | FN_8);               //Set Multiplier to 2, and DCO range to 8MHz nominal
   SCFQCTL = 121;                         //7.995392Mhz Operation with No Modulation

    // Loop until 32kHz crystal stabilizes
    do
    {
      IFG1 &= ~OFIFG;                       // Clear oscillator fault flag
	  _delay_cycles(50000);
    }
    while (IFG1 & OFIFG);                   // Test osc fault flag	

}