gistfile1.c

#include <msp430.h>				

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog timer
  P1DIR |= 0x40;                        // Set P1.0 to output direction

  for (;;)
  {
	volatile unsigned int j;

	j = P1IN & 0x10;
	if (j) {
		P1OUT = 0x40;
	} else {
		P1OUT = 0;
	}

  }
}