usart.h File Reference

SAM SERCOM USART Driver.

Copyright (c) 2012-2020 Microchip Technology Inc. and its subsidiaries.

#include <compiler.h>
#include <sercom.h>
#include <pinmux.h>

Data Structures
struct	usart_config
	USART configuration struct. More...
struct	usart_module
	SERCOM USART driver software device instance structure. More...

Macros
#define	PINMUX_DEFAULT   0
	Default pinmux. More...
#define	PINMUX_UNUSED   0xFFFFFFFF
	Unused pinmux. More...
#define	USART_TIMEOUT   0xFFFF
	USART timeout value. More...

Enumerations
enum	usart_character_size {   USART_CHARACTER_SIZE_5BIT = SERCOM_USART_CTRLB_CHSIZE(5),   USART_CHARACTER_SIZE_6BIT = SERCOM_USART_CTRLB_CHSIZE(6),   USART_CHARACTER_SIZE_7BIT = SERCOM_USART_CTRLB_CHSIZE(7),   USART_CHARACTER_SIZE_8BIT = SERCOM_USART_CTRLB_CHSIZE(0),   USART_CHARACTER_SIZE_9BIT = SERCOM_USART_CTRLB_CHSIZE(1) }
	USART Character Size. More...
enum	usart_dataorder {   USART_DATAORDER_MSB = 0,   USART_DATAORDER_LSB = SERCOM_USART_CTRLA_DORD }
	USART Data Order enum. More...
enum	usart_parity {   USART_PARITY_ODD = SERCOM_USART_CTRLB_PMODE,   USART_PARITY_EVEN = 0,   USART_PARITY_NONE = 0xFF }
	USART Parity enum. More...
enum	usart_signal_mux_settings {   USART_RX_0_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(0)),   USART_RX_0_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(0) | SERCOM_USART_CTRLA_TXPO),   USART_RX_1_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(1)),   USART_RX_1_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(1) | SERCOM_USART_CTRLA_TXPO),   USART_RX_2_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(2)),   USART_RX_2_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(2) | SERCOM_USART_CTRLA_TXPO),   USART_RX_3_TX_0_XCK_1 = (SERCOM_USART_CTRLA_RXPO(3)),   USART_RX_3_TX_2_XCK_3 = (SERCOM_USART_CTRLA_RXPO(3) | SERCOM_USART_CTRLA_TXPO) }
	USART signal MUX settings. More...
enum	usart_stopbits {   USART_STOPBITS_1 = 0,   USART_STOPBITS_2 = SERCOM_USART_CTRLB_SBMODE }
	USART Stop Bits enum. More...
enum	usart_transceiver_type {   USART_TRANSCEIVER_RX,   USART_TRANSCEIVER_TX }
	USART Transceiver. More...
enum	usart_transfer_mode {   USART_TRANSFER_SYNCHRONOUSLY = (SERCOM_USART_CTRLA_CMODE),   USART_TRANSFER_ASYNCHRONOUSLY = (0x0ul << SERCOM_USART_CTRLA_CMODE_Pos) }
	USART Transfer mode enum. More...

Functions
static void	usart_disable (const struct usart_module *const module)
	Disable module. More...
static void	usart_enable (const struct usart_module *const module)
	Enable the module. More...
static void	usart_get_config_defaults (struct usart_config *const config)
	Initializes the device to predefined defaults. More...
enum status_code	usart_init (struct usart_module *const module, Sercom *const hw, const struct usart_config *const config)
	Initializes the device. More...
static bool	usart_is_syncing (const struct usart_module *const module)
	Check if peripheral is busy syncing registers across clock domains. More...
static void	usart_reset (const struct usart_module *const module)
	Resets the USART module. More...
Lock/Unlock
static enum status_code	usart_lock (struct usart_module *const module)
	Attempt to get lock on driver instance. More...
static void	usart_unlock (struct usart_module *const module)
	Unlock driver instance. More...
Writing and Reading
enum status_code	usart_write_wait (struct usart_module *const module, const uint16_t tx_data)
	Transmit a character via the USART. More...
enum status_code	usart_read_wait (struct usart_module *const module, uint16_t *const rx_data)
	Receive a character via the USART. More...
enum status_code	usart_write_buffer_wait (struct usart_module *const module, const uint8_t *tx_data, uint16_t length)
	Transmit a buffer of characters via the USART. More...
enum status_code	usart_read_buffer_wait (struct usart_module *const module, uint8_t *rx_data, uint16_t length)
	Receive a buffer of length characters via the USART. More...
Enabling/Disabling Receiver and Transmitter
static void	usart_enable_transceiver (struct usart_module *const module, enum usart_transceiver_type transceiver_type)
	Enable Transceiver. More...
static void	usart_disable_transceiver (struct usart_module *const module, enum usart_transceiver_type transceiver_type)
	Disable Transceiver. More...