init_gpio function

gistfile1.txt

void init_gpio(void){
	int i;
	// pullup all
	*GPPUD 	= 0x02;
	// wait 150 cycle
	for(i=0;i<150;i++){
		// nop
		asm("mov r0,r0");
	}
	*GPPUDCLK0 = 0xffffffff;
	*GPPUDCLK1 = 0xffffffff;
	// wait 150 cycle
	for(i=0;i<150;i++){
		// nop
		asm("mov r0,r0");
	}
	*GPPUDCLK0 = 0;
	*GPPUDCLK1 = 0;

	*GPFSEL0 = 0;
	*GPFSEL1 = 0;
	*GPFSEL2 = 0;
	*GPFSEL3 = 0;
	*GPFSEL4 = 0;
	*GPFSEL5 = 0;
}