[求助] 想调用平均值函数

// 主函数
void main(void)
{
  //unsigned char i;
  WDTCTL = WDTPW + WDTHOLD;
  ADC10CTL0 = SREF_1 + ADC10SHT_0 + ADC10ON + REFON;
  ADC10CTL0 |= REF2_5V;
  ADC10CTL1 = INCH_1+CONSEQ_0+ADC10DIV_0+ADC10SSEL_2;
  ADC10AE0 |= BIT1;
 
  while(1)
  {
    ADC10CTL0 |= ENC + ADC10SC;
    volMeasured[volMeasuredPosition++] = ADC10MEM;
    if(volMeasuredPosition == 8)
      volMeasuredPosition = 0;

    volAverage = Average(long volMeasured[8]);                 //     为什么我这边调用平均值函数时，编译时会错误？

        P1DIR |= BIT0;
     if(volAverage >0x01FF )    //当电压>1.2V时，红灯亮
        P1OUT |= BIT0;
     else
        P1OUT &= ~BIT0;
  }
}