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请问 __even_in_range() 这个函数的功能、参数还有返回值是什么?



我刚学430,看到这样的代码

#pragma vector=TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
{
switch(__even_in_range(TA1IV,14))
{
case 0:break;
case 2:break;
case 4:break;
case 6:break;
case 8:break;
case 10:break;
case 12:break;
case 14:
P1OUT ^= BIT7;
break;
default:break;
}
}

不知道__even_in_range() 这个函数的功能、参数还有返回值是什么?能给小弟指点一下吗?