MSP430 ADC10 A1 read function

int read_adc_A1(void)
{
  ADC10CTL0 = ADC10ON | SREF_0 | ADC10SHT_3;// | REF2_5V | REFOUT;
  ADC10CTL1 = INCH_1 | ADC10DIV_7 | ADC10SSEL_2;
  ADC10AE0 = BIT1;
  int avg = 0;
  uint8_t i = 0;
  for (i=0; i<16; i++) {
    ADC10CTL0 |= ENC | ADC10SC;
    while (ADC10CTL1 & ADC10BUSY) {};
    avg += ADC10MEM;
  }
  int tmp = avg / 16;

  return tmp;
}