Two-Wire Interface High Speed (TWIHS) driver for SAM.

#include "compiler.h"

Data Structures
struct	twihs_options
	Input parameters when initializing the TWIHS module mode. More...

struct	twihs_packet
	Information concerning the data transmission. More...

Macros
#define	TWIHS_TIMEOUT 30000
	Time-out value (number of attempts). More...


#define	TWIHS_SUCCESS 0
	Return codes for TWIHS APIs. More...

#define	TWIHS_INVALID_ARGUMENT 1

#define	TWIHS_ARBITRATION_LOST 2

#define	TWIHS_NO_CHIP_FOUND 3

#define	TWIHS_RECEIVE_OVERRUN 4

#define	TWIHS_RECEIVE_NACK 5

#define	TWIHS_SEND_OVERRUN 6

#define	TWIHS_SEND_NACK 7

#define	TWIHS_BUSY 8

#define	TWIHS_ERROR_TIMEOUT 9

Typedefs
typedef struct twihs_options	twihs_options_t
	Input parameters when initializing the TWIHS module mode. More...

typedef struct twihs_packet	twihs_packet_t
	Information concerning the data transmission. More...

Functions
static void	twihs_clear_disable_clock_wait_state (Twihs *p_twihs)
	Clear clock wait state disable mode. More...

static void	twihs_disable_alternative_command (Twihs *p_twihs)
	Enable alternative command mode. More...

static void	twihs_disable_clock_wait_state (Twihs *p_twihs)
	Clock stretching disabled in slave mode, OVRE and UNRE will indicate overrun and underrun. More...

static void	twihs_disable_highspeed (Twihs *p_twihs)
	Disable high speed mode. More...

void	twihs_disable_interrupt (Twihs *p_twihs, uint32_t ul_sources)
	Disable TWIHS interrupts. More...

void	twihs_disable_master_mode (Twihs *p_twihs)
	Disable TWIHS master mode. More...

static void	twihs_disable_pec (Twihs *p_twihs)
	Disable packet error checking. More...

static void	twihs_disable_slave_default_addr (Twihs *p_twihs)
	Acknowledge of the SMBus Default Address disabled. More...

void	twihs_disable_slave_mode (Twihs *p_twihs)
	Disable TWIHS slave mode. More...

static void	twihs_disable_slave_nack (Twihs *p_twihs)
	Normal value to be returned in the ACK cycle of the data phase in slave receiver mode. More...

static void	twihs_disable_smbus (Twihs *p_twihs)
	Disable SMBus mode. More...

static void	twihs_disable_smbus_host_header (Twihs *p_twihs)
	Acknowledge of the SMBus Host Header disabled. More...

static void	twihs_enable_alternative_command (Twihs *p_twihs)
	Enable alternative command mode. More...

static void	twihs_enable_highspeed (Twihs *p_twihs)
	Enable high speed mode. More...

void	twihs_enable_interrupt (Twihs *p_twihs, uint32_t ul_sources)
	Enable TWIHS interrupts. More...

void	twihs_enable_master_mode (Twihs *p_twihs)
	Enable TWIHS master mode. More...

static void	twihs_enable_pec (Twihs *p_twihs)
	Enable packet error checking. More...

static void	twihs_enable_slave_default_addr (Twihs *p_twihs)
	Acknowledge of the SMBus Default Address enabled. More...

void	twihs_enable_slave_mode (Twihs *p_twihs)
	Enable TWIHS slave mode. More...

static void	twihs_enable_slave_nack (Twihs *p_twihs)
	NACK value to be returned in the ACK cycle of the data phase in slave receiver mode. More...

static void	twihs_enable_smbus (Twihs *p_twihs)
	Enable SMBus mode. More...

static void	twihs_enable_smbus_host_header (Twihs *p_twihs)
	Acknowledge of the SMBus Host Header enabled. More...

static void	twihs_enable_smbus_quick_command (Twihs *p_twihs)
	If Master mode is enabled, a SMBUS Quick Command is sent. More...

uint32_t	twihs_get_interrupt_mask (Twihs *p_twihs)
	Read TWIHS interrupt mask. More...

uint32_t	twihs_get_interrupt_status (Twihs *p_twihs)
	Get TWIHS interrupt status. More...

Pdc *	twihs_get_pdc_base (Twihs *p_twihs)
	Get TWIHS PDC base address. More...

void	twihs_mask_slave_addr (Twihs *p_twihs, uint32_t ul_mask)
	A mask can be applied on the slave device address in slave mode in order to allow multiple address answer. More...

uint32_t	twihs_master_init (Twihs p_twihs, const twihs_options_t p_opt)
	Initialize TWIHS master mode. More...

uint32_t	twihs_master_read (Twihs p_twihs, twihs_packet_t p_packet)
	Read multiple bytes from a TWIHS compatible slave device. More...

uint32_t	twihs_master_write (Twihs p_twihs, twihs_packet_t p_packet)
	Write multiple bytes to a TWIHS compatible slave device. More...

uint32_t	twihs_probe (Twihs *p_twihs, uint8_t uc_slave_addr)
	Test if a chip answers a given I2C address. More...

uint8_t	twihs_read_byte (Twihs *p_twihs)
	Reads a byte from the TWIHS bus. More...

void	twihs_read_write_protection_status (Twihs p_twihs, uint32_t p_status)
	Read the write protection status. More...

static void	twihs_request_pec (Twihs *p_twihs)
	Request a packet error checking. More...

void	twihs_reset (Twihs *p_twihs)
	Reset TWIHS. More...

static void	twihs_send_clear (Twihs *p_twihs)
	If master mode is enabled, send a bus clear command. More...

void	twihs_set_alternative_command (Twihs *p_twihs, uint32_t ul_alt_cmd)
	Set length/direction/PEC for alternative command mode. More...

void	twihs_set_filter (Twihs *p_twihs, uint32_t ul_filter)
	Set the filter for TWIHS. More...

void	twihs_set_slave_addr (Twihs *p_twihs, uint32_t ul_device_addr)
	Set TWIHS slave address. More...

uint32_t	twihs_set_speed (Twihs *p_twihs, uint32_t ul_speed, uint32_t ul_mck)
	Set the I2C bus speed in conjunction with the clock frequency. More...

void	twihs_set_write_protection (Twihs *p_twihs, bool flag)
	Enables/Disables write protection mode. More...

void	twihs_slave_init (Twihs *p_twihs, uint32_t ul_device_addr)
	Initialize TWIHS slave mode. More...

uint32_t	twihs_slave_read (Twihs p_twihs, uint8_t p_data)
	Read data from master. More...

uint32_t	twihs_slave_write (Twihs p_twihs, uint8_t p_data)
	Write data to TWIHS bus. More...

void	twihs_smbus_set_timing (Twihs *p_twihs, uint32_t ul_timing)
	Set the prescaler, TLOW:SEXT, TLOW:MEXT and clock high max cycles for SMBUS mode. More...

void	twihs_write_byte (Twihs *p_twihs, uint8_t uc_byte)
	Sends a byte of data to one of the TWIHS slaves on the bus. More...

#define TWIHS_ARBITRATION_LOST 2

#define TWIHS_BUSY 8

Referenced by ov_write_regs().

#define TWIHS_ERROR_TIMEOUT 9

Referenced by twihs_master_read().

#define TWIHS_INVALID_ARGUMENT 1

Referenced by twihs_master_init(), twihs_master_read(), and twihs_master_write().

#define TWIHS_NO_CHIP_FOUND 3

#define TWIHS_RECEIVE_NACK 5

Referenced by twihs_master_read(), and twihs_master_write().

#define TWIHS_RECEIVE_OVERRUN 4

#define TWIHS_SEND_NACK 7

#define TWIHS_SEND_OVERRUN 6

#define TWIHS_SUCCESS 0

Return codes for TWIHS APIs.

Referenced by at24macxx_acknowledge_polling(), at24macxx_read_byte(), at24macxx_read_continuous(), at24macxx_read_page(), at24macxx_write_byte(), at24macxx_write_page(), at30tse_eeprom_read(), at30tse_eeprom_write(), at30tse_init(), at30tse_read_register(), at30tse_set_register_pointer(), at30tse_write_register(), main(), mxt_probe_device(), nm_bus_init(), twihs_master_init(), twihs_master_read(), and twihs_master_write().

#define TWIHS_TIMEOUT 30000

Time-out value (number of attempts).

Referenced by twihs_master_read().

typedef struct twihs_options twihs_options_t

Input parameters when initializing the TWIHS module mode.

typedef struct twihs_packet twihs_packet_t

Information concerning the data transmission.

static void twihs_clear_disable_clock_wait_state ( Twihs * p_twihs )

inlinestatic

Clear clock wait state disable mode.

Parameters