MSP430G2553 ADC Demo - External

#include <msp430.h>
#include <stdint.h>

void setOnboardLEDs(const uint8_t greenOn, const uint8_t redOn) {

    uint8_t outVal = 0;
    if (greenOn) outVal |= 0b01000000;
    if (redOn)   outVal |= 0b00000001;
    P1OUT = outVal;

}

int main(void) {

    uint16_t aVal;
    volatile uint16_t x;

    WDTCTL = WDTPW | WDTHOLD;   // stop watchdog timer
    P1DIR = 0b01000001; // Pin P1.6 (green LED) and P1.0 (red LED) are Outputs

    ADC10CTL1 = INCH_4; // Direct ADC to channel 4 (pin 1.4)
    ADC10AE0 = 0b00010000; // Enable analog input for pin 1.4
    ADC10CTL0 = ADC10ON + ENC; // Turn the ADC10 module on and enable it


    for ( ; ; ) {

        ADC10CTL0 |= ADC10SC; // Start conversion
        while (0 == ADC10CTL0 & ADC10IFG) {}; // Wait for it to end
        aVal = ADC10MEM; // Read conversion result

        setOnboardLEDs(aVal > 768, aVal < 256);

    }

    return 0;
}