blinker.c

来自「Bacnet protocol stack for linux」· C语言 代码 · 共 44 行

/*****************************************************************************
    blinker.c

    Endless loop blinks a code for crash analysis

    Inputs: Code  -  blink code to display
        1 = undefined instruction (one blinks ........ long pause)
        2 = prefetch abort        (two blinks ........ long pause)
        3 = data abort            (three blinks ...... long pause)

    Author:  James P Lynch  May 12, 2007
*****************************************************************************/
#include "AT91SAM7S256.h"
#include "board.h"

/* global variables */
unsigned long blinkcount;

void blinker(
    unsigned char code)
{

    volatile AT91PS_PIO pPIO = AT91C_BASE_PIOA; /* pointer to PIO register structure */
    volatile unsigned int j, k; /* loop counters */

    /* endless loop */
    while (1) {
        /* count out the proper number of blinks */
        for (j = code; j != 0; j--) {
            /* turn LED1 (DS1) on */
            pPIO->PIO_CODR = LED1;
            /* wait 250 msec */
            for (k = 600000; k != 0; k--);
            /* turn LED1 (DS1) off */
            pPIO->PIO_SODR = LED1;
            /* wait 250 msec */
            for (k = 600000; k != 0; k--);
        }
        /* wait 2 seconds */
        for (k = 5000000; (code != 0) && (k != 0); k--);
        blinkcount++;
    }
}