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                            # uboot下gpio操作
#define endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())
arch/arm/mach-sunxi/cpu_info.c
arch/arm/lib/bootm.c

~~~
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
#include <cli.h>

unsigned int * cfg_reg=(unsigned int *)(0x01C20800+1*0x24+0);
unsigned int * data_reg=(unsigned int *)(0x01C20800+1*0x24+0x10);
unsigned int tmp,tmp0,tmp1;
uint64_t t1;
int i;

tmp = *cfg_reg;
tmp &= ~0x0f00;
tmp |= 0x0100;
*cfg_reg = tmp;

tmp=*data_reg;
tmp0 = tmp&(~0x04);
tmp1 = tmp|0x04;

t1=get_ticks()+get_tbclk()/12;
for(i=0;i<3;i++)
{
*data_reg=tmp0;
puts("beep 0\n");
while(get_ticks()<t1);
t1=get_ticks()+get_tbclk()/10;
*data_reg=tmp1;
puts("beep 1\n");
while(get_ticks()<t1);
t1=get_ticks()+get_tbclk()/10;
}
*data_reg=tmp0;
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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