arch/avr32/delay.c

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#include <delay.h>
#include <types.h>
#include <util.h>

#include <arch/sysreg.h>
#include <chip/clk.h>

void udelay(unsigned long us)
{
        uint32_t count, count_end;

        count = sysreg_read(COUNT);
        count_end = count + div_ceil(get_cpu_clock_rate(), 1000000) * us;

        while ((int32_t)(count_end - count) > 0)
                count = sysreg_read(COUNT);
}

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