delay.h

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#define DELAY(n)                 \
    {                            \
        volatile long N = 2 * n; \
                                 \
        while (N > 0)            \
        {                        \
            N--;                 \
        }                        \
    }

#define MDELAY(n)               \
    {                           \
        register long i;        \
                                \
        for (i = n; i > 0; i--) \
        {                       \
            DELAY(1000);        \
        }                       \
    }