main.c

MSP430有许多寄存器来设定程序的频率和周期

#include "msp430.h"
char Key_Pressed(void);

int main( void )
{
  unsigned char seg[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
  unsigned int i=0;
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  P1DIR &=~BIT0;
  P4DIR=0xff;
  P4OUT=seg[8];
  while(1)
  {
    if (Key_Pressed())
      P4OUT=seg[i++];
    if(i>9)
      i=0;
    
  }
}
char Key_Pressed(void)
{
  unsigned int i;
  while (!(P1IN&BIT0));
  for(i=0;i<8000;i++);
    if (!(P1IN&BIT0))
      return 1;
  else
    return 0;

}