blinky.c

来自「用keil仿真arm芯片的程序」· C语言 代码 · 共 31 行

/* BLINKY.C - LED Flasher */
                  
#include <LPC210x.H>                       /* LPC210x definitions */

void wait (void)  {                        /* wait function */
  ;                                        /* only to delay for LED flashes */
}

int main (void)  {
  unsigned int i;                          /* Delay var */
  unsigned int j;                          /* LED var */

  IODIR = 0xFF;                            /* P0.0..7 defined as Outputs */
  while (1) {                              /* Loop forever */
    for (j = 0x01; j < 0x80; j <<= 1) {    /* Blink LED 0, 1, 2, 3, 4, 5, 6 */
	  IOSET = j;                           /* Turn on LED */
      for (i = 0; i < 10000; i++)  {       /* Delay for 10000 Counts */
        wait ();                           /* call wait function */
      }
	  IOCLR = j;                           /* Turn off LED */
	}
    for (j = 0x80; j > 0x01; j >>=1) {     /* Blink LED 7, 6, 5, 4, 3, 2, 1 */
	  IOSET = j;                           /* Turn on LED */
      for (i = 0; i < 10000; i++)  {       /* Delay for 10000 Counts */
        wait ();                           /* call wait function */
      }
	  IOCLR = j;                           /* Turn off LED */
    }
  }
}