w1.h File Reference

Public 1-Wire Driver APIs. More...

#include <zephyr/types.h>
#include <zephyr/device.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/crc.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/syscalls/w1.h>

Go to the source code of this file.

Data Structures
struct	w1_rom
	w1_rom struct. More...
struct	w1_slave_config
	Node specific 1-wire configuration struct. More...

Macros
#define	W1_SEARCH_ALL_FAMILIES   0x00
	This flag can be passed to searches in order to not filter on family ID.
#define	W1_ROM_INIT_ZERO
	Initialize all w1_rom struct members to zero.
1-Wire ROM Commands
#define	W1_CMD_SKIP_ROM   0xCC
	This command allows the bus master to read the slave devices without providing their ROM code.
#define	W1_CMD_MATCH_ROM   0x55
	This command allows the bus master to address a specific slave device by providing its ROM code.
#define	W1_CMD_RESUME   0xA5
	This command allows the bus master to resume a previous read out from where it left off.
#define	W1_CMD_READ_ROM   0x33
	This command allows the bus master to read the ROM code from a single slave device.
#define	W1_CMD_SEARCH_ROM   0xF0
	This command allows the bus master to discover the addresses (i.e., ROM codes) of all slave devices on the bus.
#define	W1_CMD_SEARCH_ALARM   0xEC
	This command allows the bus master to identify which devices have experienced an alarm condition.
#define	W1_CMD_OVERDRIVE_SKIP_ROM   0x3C
	This command allows the bus master to address all devices on the bus and then switch them to overdrive speed.
#define	W1_CMD_OVERDRIVE_MATCH_ROM   0x69
	This command allows the bus master to address a specific device and switch it to overdrive speed.
CRC Defines
#define	W1_CRC8_SEED   0x00
	Seed value used to calculate the 1-Wire 8-bit crc.
#define	W1_CRC8_POLYNOMIAL   0x8C
	Polynomial used to calculate the 1-Wire 8-bit crc.
#define	W1_CRC16_SEED   0x0000
	Seed value used to calculate the 1-Wire 16-bit crc.
#define	W1_CRC16_POLYNOMIAL   0xa001
	Polynomial used to calculate the 1-Wire 16-bit crc.

Typedefs
typedef void(*	w1_search_callback_t) (struct w1_rom rom, void *user_data)
	Define the application callback handler function signature for searches.

Enumerations
enum	w1_settings_type { W1_SETTING_SPEED , W1_SETTING_STRONG_PULLUP , W1_SETINGS_TYPE_COUNT }
	Defines the 1-Wire master settings types, which are runtime configurable. More...

Functions
static int	w1_lock_bus (const struct device *dev)
	Lock the 1-wire bus to prevent simultaneous access.
static int	w1_unlock_bus (const struct device *dev)
	Unlock the 1-wire bus.
int	w1_reset_bus (const struct device *dev)
	Reset the 1-Wire bus to prepare slaves for communication.
int	w1_read_bit (const struct device *dev)
	Read a single bit from the 1-Wire bus.
int	w1_write_bit (const struct device *dev, const bool bit)
	Write a single bit to the 1-Wire bus.
int	w1_read_byte (const struct device *dev)
	Read a single byte from the 1-Wire bus.
int	w1_write_byte (const struct device *dev, uint8_t byte)
	Write a single byte to the 1-Wire bus.
int	w1_read_block (const struct device *dev, uint8_t *buffer, size_t len)
	Read a block of data from the 1-Wire bus.
int	w1_write_block (const struct device *dev, const uint8_t *buffer, size_t len)
	Write a block of data from the 1-Wire bus.
size_t	w1_get_slave_count (const struct device *dev)
	Get the number of slaves on the bus.
int	w1_configure (const struct device *dev, enum w1_settings_type type, uint32_t value)
	Configure parameters of the 1-Wire master.
int	w1_read_rom (const struct device *dev, struct w1_rom *rom)
	Read Peripheral 64-bit ROM.
int	w1_match_rom (const struct device *dev, const struct w1_slave_config *config)
	Select a specific slave by broadcasting a selected ROM.
int	w1_resume_command (const struct device *dev)
	Select the slave last addressed with a Match ROM or Search ROM command.
int	w1_skip_rom (const struct device *dev, const struct w1_slave_config *config)
	Select all slaves regardless of ROM.
int	w1_reset_select (const struct device *dev, const struct w1_slave_config *config)
	In single drop configurations use Skip Select command, otherwise use Match ROM command.
int	w1_write_read (const struct device *dev, const struct w1_slave_config *config, const uint8_t *write_buf, size_t write_len, uint8_t *read_buf, size_t read_len)
	Write then read data from the 1-Wire slave with matching ROM.
int	w1_search_bus (const struct device *dev, uint8_t command, uint8_t family, w1_search_callback_t callback, void *user_data)
	Search 1-wire slaves on the bus.
static int	w1_search_rom (const struct device *dev, w1_search_callback_t callback, void *user_data)
	Search for 1-Wire slave on bus.
static int	w1_search_alarm (const struct device *dev, w1_search_callback_t callback, void *user_data)
	Search for 1-Wire slaves with an active alarm.
static uint64_t	w1_rom_to_uint64 (const struct w1_rom *rom)
	Function to convert a w1_rom struct to an uint64_t.
static void	w1_uint64_to_rom (const uint64_t rom64, struct w1_rom *rom)
	Function to write an uint64_t to struct w1_rom pointer.
static uint8_t	w1_crc8 (const uint8_t *src, size_t len)
	Compute CRC-8 chacksum as defined in the 1-Wire specification.
static uint16_t	w1_crc16 (const uint16_t seed, const uint8_t *src, const size_t len)
	Compute 1-Wire variant of CRC 16.

Detailed Description

Public 1-Wire Driver APIs.