有一段代码我不是很理解

1万 · 2015-6-28 19:49

#include  <msp430g2553.h>
void main (void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P1DIR |= 0x01;                         // P1.0 output
  CACTL2 = P2CA4;                         // P1.1 = CA1
  while (1)                               // Mainloop
  {
Batt_Check();
  }
}
void Batt_Check(void) {
  CACTL1 = CAREF_1 + CAON;                // 0.25*Vcc on P1.1, Comp. on
  i = 16384;                               // delay
  while(i>0) {
i--;
  }
  CACTL1 = CARSEL + CAREF_2 + CAREF_1 + CAON; // 0.55V on -, Comp. on
  if (CACTL2 & CAOUT)
P1OUT ^= 0x01;                         // P1.0 toggle
  else P1OUT |= 0x01;                      // P1.0 set
  CACTL1 = 0x00;                         // Disable Comp_A, save power
}

这是官网上我下的有关比较器A 的例程。。。其中有一段代码我不是很理解
CACTL1 = CAREF_1 + CAON;                // 0.25*Vcc on P1.1, Comp. on
  i = 16384;                               // delay
  while(i>0) {
i--;
  }