beep_test.c

uboot底层驱动

int sound_flag = 0;
int sound_time = 0;
void beep_test(void)
{
	int i,k;
 
	*(volatile unsigned int *)(0x1000c010) = 0X000013ff;


		//*(volatile unsigned long *)(0x1000c014) = 0xffff;
	for(i = 1; i < 4; i++)
		for (k = 0; k < 0x5fff00; k++)
	 		*(volatile unsigned long *)(0x1000c018) = 0Xff*i;
	*(volatile unsigned int *)(0x1000c010) = 0 ;	


	
}