sensing_light.c

#include<msp430.h>

void adc_init()
{
	ADC10CTL0 = ADC10ON | SREF_0 | ADC10SHT_2;
        ADC10CTL1 = INCH_0 | SHS_0 | ADC10SSEL_0 | ADC10DIV_0 | CONSEQ_0;
        ADC10CTL0 |= ENC;
        ADC10AE0 = BIT0;
}

void start_conversion()
{
	ADC10CTL0 |= ADC10SC;
}

unsigned int converting()
{
	return ADC10CTL1&ADC10BUSY;
}

void delay(void)
{
        int i;
        for(i=0;i<1000;i++);
}

main()
{
	P1DIR=0x40;
	P1OUT=0x40;
	adc_init();
	while(1)
	{
		start_conversion();
		while(converting());
		if(ADC10MEM > 380)
			P1OUT=0;
		else
		{
			P1OUT=0x40;
		}
		delay();
		
	}
}