/* USART pinmux initialization function. 
Set each required pin to USART functionality  */
void TARGET_IO_PORT_init()
/* USART pinmux initialization function. 
Set each required pin to USART functionality  */
void TARGET_IO_PORT_init()
{
	gpio_set_pin_function(PA22, PINMUX_PA22C_SERCOM3_PAD0);
	gpio_set_pin_function(PA23, PINMUX_PA23C_SERCOM3_PAD1);
}