test44x_clks2.c

来自「MSP430_实验源码_clock_FLL+」· C语言 代码 · 共 26 行

#include "msp430x44x.h"

void main(void)
{
  unsigned int i;
  
  WDTCTL = WDTPW + WDTHOLD;       // stop watchdog timer
  FLL_CTL0 = XCAP18PF;            // set load capacitance for 32k xtal
  FLL_CTL1 = FLL_CTL1 & ~XT2OFF;  // clear bit = high freq xtal on

  do                              // loop until flag is clear
  {
    FLL_CTL0 = FLL_CTL0 & ~XT2OF; // clear high freq oscillator fault flag
    for (i = 50000; i; i--);      // delay for crystal to start and FLL to lock
  }
  while (FLL_CTL0 & XT2OF);       // test high freq oscillator fault flag
  
                                  // if flag remained clear then -  
  FLL_CTL1 = SELS;                // switch SMCLK = HF xtal                 
  P1DIR = 0x32;                   // P1.1, P1.4 & P1.5 to outputs
  P1SEL = 0x32;                   // P1.1, P1.4 & P1.5 functions to output
                                  // MCLK, SMCLK & ACLK
  while(1);                       // loop in place
}