arch/avr8/delay.c

Go to the documentation of this file.

#include <assert.h>
#include <delay.h>
#include <types.h>
#include <compiler.h>

static void delay_loop(uint16_t iterations)
{
#ifdef __GNUC__
        asm volatile(
                "1:     sbiw    %0, 1\n"
                "       brne    1b"
                : "+w"(iterations));
#else
        while (iterations--) {
                barrier();
        }
#endif
}

static void udelay_internal(unsigned int us)
{
        delay_loop(((CONFIG_CPU_HZ / 1000000) * us) / 4);
}

void udelay(unsigned int us)
{
        assert(us != 0);

        udelay_internal(us);
}

void mdelay(unsigned int ms)
{
        assert(ms != 0);

        do {
                udelay_internal(1000);
                ms--;
        } while (ms != 0);
}

---