SAM L21 Serial driver config.

Macros
#define	BLE_UART_CTS_PIN (EXT1_PIN_18)

#define	BLE_UART_RTS_PIN (EXT1_PIN_16)

#define	CONF_BLE_MUX_SETTING EXT1_UART_SERCOM_MUX_SETTING

#define	CONF_BLE_PINMUX_PAD0 EXT1_UART_SERCOM_PINMUX_PAD0

#define	CONF_BLE_PINMUX_PAD1 EXT1_UART_SERCOM_PINMUX_PAD1

#define	CONF_BLE_PINMUX_PAD2 EXT1_UART_SERCOM_PINMUX_PAD2

#define	CONF_BLE_PINMUX_PAD3 EXT1_UART_SERCOM_PINMUX_PAD3

#define	CONF_BLE_UART_CLOCK GCLK_GENERATOR_0

#define	CONF_BLE_USART_MODULE EXT1_UART_MODULE

#define	CONF_FLCR_BLE_BAUDRATE 115200

#define	CONF_FLCR_BLE_MUX_SETTING USART_RX_1_TX_0_RTS_2_CTS_3

#define	CONF_FLCR_BLE_PINMUX_PAD0 PINMUX_PA04D_SERCOM0_PAD0

#define	CONF_FLCR_BLE_PINMUX_PAD1 PINMUX_PA05D_SERCOM0_PAD1

#define	CONF_FLCR_BLE_PINMUX_PAD2 PINMUX_PA06D_SERCOM0_PAD2

#define	CONF_FLCR_BLE_PINMUX_PAD3 PINMUX_PA07D_SERCOM0_PAD3

#define	CONF_FLCR_BLE_UART_CLOCK GCLK_GENERATOR_0

#define	CONF_FLCR_BLE_USART_MODULE SERCOM0

#define	CONF_UART_BAUDRATE 115200

#define	HOST_SYSTEM_SLEEP_MODE SYSTEM_SLEEPMODE_IDLE

#define	IOPORT_PIN_LEVEL_HIGH (true)

#define	IOPORT_PIN_LEVEL_LOW (false)