arduino i2c in plain c declarations More...

#include <Arduino.h>
#include <inttypes.h>
#include <stdbool.h>

Include dependency graph for ci2c.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	StructI2CSlave
	ci2c slave config and control parameters More...

Macros
#define	__attribute__(a)
	GCC attribute (ignored by Doxygen) More...

#define	DEF_CI2C_NB_RETRIES 3
	Default cI2C transaction retries. More...

#define	DEF_CI2C_TIMEOUT 100
	Default cI2C timeout. More...

Typedefs
typedef enum enI2C_RW	I2C_RW

typedef enum enI2C_SPEED	I2C_SPEED

typedef enum enI2C_STATUS	I2C_STATUS

typedef enum enI2C_INT_SIZE	I2C_INT_SIZE

typedef bool(*	ci2c_fct_ptr) (void , const uint16_t, uint8_t , const uint16_t)
	i2c read/write function pointer typedef More...

typedef struct StructI2CSlave	I2C_SLAVE

Enumerations
enum	enI2C_RW { I2C_WRITE = 0, I2C_READ }
	I2C RW bit enumeration. More...

enum	enI2C_SPEED { I2C_STD = 100, I2C_FM = 400, I2C_FMP = 1000, I2C_HS = 3400 }
	I2C bus speed. More...

enum	enI2C_STATUS { I2C_OK = 0x00, I2C_BUSY, I2C_NACK }
	I2C slave status. More...

enum	enI2C_INT_SIZE { I2C_NO_REG = 0x00, I2C_8B_REG, I2C_16B_REG }
	I2C slave internal address registers size. More...

Functions
void	I2C_slave_init (I2C_SLAVE *slave, const uint8_t sl_addr, const I2C_INT_SIZE reg_sz)
	Init an I2C slave structure for cMI2C communication. More...

void	I2C_slave_set_rw_func (I2C_SLAVE *slave, const ci2c_fct_ptr func, const I2C_RW rw)
	Redirect slave I2C read/write function (if needed for advanced use) More...

bool	I2C_slave_set_addr (I2C_SLAVE *slave, const uint8_t sl_addr)
	Change I2C slave address. More...

bool	I2C_slave_set_reg_size (I2C_SLAVE *slave, const I2C_INT_SIZE reg_sz)
	Change I2C registers map size (for access) More...

uint8_t	I2C_slave_get_addr (const I2C_SLAVE *slave)
	Get I2C slave address. More...

bool	I2C_slave_get_reg_size (const I2C_SLAVE *slave)
	Get I2C register map size (for access) More...

uint16_t	I2C_slave_get_reg_addr (const I2C_SLAVE *slave)
	Get I2C current register address (addr may passed this way in procedures if contigous accesses) More...

void	I2C_init (const uint16_t speed)
	Enable I2c module on arduino board (including pull-ups, enabling of ACK, and setting clock frequency) More...

void	I2C_uninit ()
	Disable I2c module on arduino board (releasing pull-ups, and TWI control) More...

uint16_t	I2C_set_speed (const uint16_t speed)
	Change I2C frequency. More...

uint16_t	I2C_set_timeout (const uint16_t timeout)
	Change I2C ack timeout. More...

uint8_t	I2C_set_retries (const uint8_t retries)
	Change I2C message retries (in case of failure) More...

bool	I2C_is_busy (void)
	Get I2C busy status. More...

I2C_STATUS	I2C_write (I2C_SLAVE slave, const uint16_t reg_addr, uint8_t data, const uint16_t bytes)
	This function writes the provided data to the address specified. More...

I2C_STATUS	I2C_write_next (I2C_SLAVE slave, uint8_t data, const uint16_t bytes)
	This inline is a wrapper to I2C_write in case of contigous operations. More...

I2C_STATUS	I2C_read (I2C_SLAVE slave, const uint16_t reg_addr, uint8_t data, const uint16_t bytes)
	This function reads data from the address specified and stores this data in the area provided by the pointer. More...

I2C_STATUS	I2C_read_next (I2C_SLAVE slave, uint8_t data, const uint16_t bytes)
	This inline is a wrapper to I2C_read in case of contigous operations. More...

void	I2C_reset (void)
	I2C bus reset (Release SCL and SDA lines and re-enable module) More...

bool	I2C_start (void)
	Send start condition. More...

bool	I2C_stop (void)
	Send stop condition. More...

bool	I2C_wr8 (const uint8_t dat)
	Send byte on bus. More...

uint8_t	I2C_rd8 (const bool ack)
	Receive byte from bus. More...

bool	I2C_sndAddr (I2C_SLAVE *slave, const I2C_RW rw)
	Send I2C address. More...

Detailed Description

arduino i2c in plain c declarations

Author: SMFSW

Copyright: MIT SMFSW (2017)

Warning: Don't access (r/w) last 16b internal address byte alone right after init, this would lead to hazardous result (in such case, make a dummy read of addr 0 before)

Macro Definition Documentation

◆ attribute

#define __attribute__ ( a )

GCC attribute (ignored by Doxygen)

◆ DEF_CI2C_NB_RETRIES

#define DEF_CI2C_NB_RETRIES 3

Default cI2C transaction retries.

◆ DEF_CI2C_TIMEOUT

#define DEF_CI2C_TIMEOUT 100

Default cI2C timeout.

Typedef Documentation

◆ ci2c_fct_ptr

typedef bool(* ci2c_fct_ptr) (void *, const uint16_t, uint8_t *, const uint16_t)

i2c read/write function pointer typedef

◆ I2C_INT_SIZE

typedef enum enI2C_INT_SIZE I2C_INT_SIZE

◆ I2C_RW

typedef enum enI2C_RW I2C_RW

◆ I2C_SLAVE

typedef struct StructI2CSlave I2C_SLAVE

◆ I2C_SPEED

typedef enum enI2C_SPEED I2C_SPEED

◆ I2C_STATUS

typedef enum enI2C_STATUS I2C_STATUS

Enumeration Type Documentation

◆ enI2C_INT_SIZE

enum enI2C_INT_SIZE

I2C slave internal address registers size.

GCC Attributes:: packed enum

Enumerator
I2C_NO_REG	Internal address registers not applicable for slave.
I2C_8B_REG	Slave internal address registers space is 8bits wide.
I2C_16B_REG	Slave internal address registers space is 16bits wide.

◆ enI2C_RW

enum enI2C_RW

I2C RW bit enumeration.

GCC Attributes:: packed enum

Enumerator
I2C_WRITE	I2C rw bit (write)
I2C_READ	I2C rw bit (read)

◆ enI2C_SPEED

enum enI2C_SPEED

I2C bus speed.

GCC Attributes:: packed enum

Enumerator
I2C_STD	I2C Standard (100KHz)
I2C_FM	I2C Fast Mode (400KHz)
I2C_FMP	I2C Fast mode + (1MHz): will set speed to Fast Mode (up to 400KHz on avr)
I2C_HS	I2C High Speed (3.4MHz): will set speed to Fast Mode (up to 400KHz on avr)

◆ enI2C_STATUS

enum enI2C_STATUS

I2C slave status.

GCC Attributes:: packed enum

Enumerator
I2C_OK	I2C OK.
I2C_BUSY	I2C Bus busy.
I2C_NACK	I2C Not Acknowledge.

Function Documentation

◆ I2C_init()

void I2C_init ( const uint16_t speed )

Enable I2c module on arduino board (including pull-ups, enabling of ACK, and setting clock frequency)

Parameters

[in] speed - I2C bus speed in KHz

Returns: nothing

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◆ I2C_is_busy()

bool I2C_is_busy ( void )

Get I2C busy status.

Returns: true if busy

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◆ I2C_rd8()

uint8_t I2C_rd8 ( const bool ack )

Receive byte from bus.

Parameters

[in] ack - true if wait for ack

Returns: true if data reception acknowledged (false otherwise)

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◆ I2C_read()

I2C_STATUS I2C_read	(	I2C_SLAVE *	slave,
		const uint16_t	reg_addr,
		uint8_t *	data,
		const uint16_t	bytes
	)

This function reads data from the address specified and stores this data in the area provided by the pointer.

Parameters

[in,out]	slave	- pointer to the I2C slave structure
[in]	reg_addr	- register address in register map
[in,out]	data	- pointer to the first byte of a block of data to read
[in]	bytes	- indicates how many bytes of data to read

Returns: I2C_STATUS status of read attempt

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◆ I2C_read_next()

I2C_STATUS I2C_read_next	(	I2C_SLAVE *	slave,
		uint8_t *	data,
		const uint16_t	bytes
	)

inline

This inline is a wrapper to I2C_read in case of contigous operations.

GCC Attributes:: inline

Parameters

[in,out]	slave	- pointer to the I2C slave structure
[in]	data	- pointer to the first byte of a block of data to read
[in]	bytes	- indicates how many bytes of data to read

Returns: I2C_STATUS status of read attempt

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◆ I2C_reset()

void I2C_reset ( void )

I2C bus reset (Release SCL and SDA lines and re-enable module)

Returns: nothing

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◆ I2C_set_retries()

uint8_t I2C_set_retries ( const uint8_t retries )

Change I2C message retries (in case of failure)

Parameters

[in] retries - I2C number of retries (max of 8)

Returns: Configured number of retries

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◆ I2C_set_speed()

uint16_t I2C_set_speed ( const uint16_t speed )

Change I2C frequency.

Parameters

[in] speed - I2C bus speed in KHz (max 400KHz on AVR)

Returns: Configured bus speed

Parameters

[in] speed - I2C speed in KHz (max 400KHz on avr)

Returns: Configured bus speed

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◆ I2C_set_timeout()

uint16_t I2C_set_timeout ( const uint16_t timeout )

Change I2C ack timeout.

Parameters

[in] timeout - I2C ack timeout (500 ms max)

Returns: Configured timeout

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◆ I2C_slave_get_addr()

uint8_t I2C_slave_get_addr ( const I2C_SLAVE * slave )

inline

Get I2C slave address.

GCC Attributes:: inline

Parameters

[in] slave - pointer to the I2C slave structure

Returns: I2C slave address

◆ I2C_slave_get_reg_addr()

uint16_t I2C_slave_get_reg_addr ( const I2C_SLAVE * slave )

inline

Get I2C current register address (addr may passed this way in procedures if contigous accesses)

GCC Attributes:: inline

Parameters

[in] slave - pointer to the I2C slave structure

Returns: current register map address

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◆ I2C_slave_get_reg_size()

bool I2C_slave_get_reg_size ( const I2C_SLAVE * slave )

inline

Get I2C register map size (for access)

GCC Attributes:: inline

Parameters

[in] slave - pointer to the I2C slave structure

Returns: register map using 16bits if true (1Byte otherwise)

◆ I2C_slave_init()

void I2C_slave_init	(	I2C_SLAVE *	slave,
		const uint8_t	sl_addr,
		const I2C_INT_SIZE	reg_sz
	)

Init an I2C slave structure for cMI2C communication.

Parameters

[in]	slave	- pointer to the I2C slave structure to init
[in]	sl_addr	- I2C slave address
[in]	reg_sz	- internal register map size

Returns: nothing

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◆ I2C_slave_set_addr()

bool I2C_slave_set_addr	(	I2C_SLAVE *	slave,
		const uint8_t	sl_addr
	)

Change I2C slave address.

Parameters

[in,out]	slave	- pointer to the I2C slave structure to init
[in]	sl_addr	- I2C slave address

Returns: true if new address set (false if address is >7Fh)

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◆ I2C_slave_set_reg_size()

bool I2C_slave_set_reg_size	(	I2C_SLAVE *	slave,
		const I2C_INT_SIZE	reg_sz
	)

Change I2C registers map size (for access)

Parameters

[in,out]	slave	- pointer to the I2C slave structure
[in]	reg_sz	- internal register map size

Returns: true if new size is correct (false otherwise and set to 16bit by default)

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◆ I2C_slave_set_rw_func()

void I2C_slave_set_rw_func	(	I2C_SLAVE *	slave,
		const ci2c_fct_ptr	func,
		const I2C_RW	rw
	)

Redirect slave I2C read/write function (if needed for advanced use)

Parameters

[in]	slave	- pointer to the I2C slave structure to init
[in]	func	- pointer to read/write function to affect
[in]	rw	- 0 = write function, 1 = read function

Returns: nothing

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◆ I2C_sndAddr()

bool I2C_sndAddr	(	I2C_SLAVE *	slave,
		const I2C_RW	rw
	)

Send I2C address.

Parameters

[in]	slave	- pointer to the I2C slave structure
[in]	rw	- read/write transaction

Returns: true if I2C chip address sent acknowledged (false otherwise)

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◆ I2C_start()

bool I2C_start ( void )

Send start condition.

Returns: true if start condition acknowledged (false otherwise)

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◆ I2C_stop()

bool I2C_stop ( void )

Send stop condition.

Returns: true if stop condition acknowledged (false otherwise)

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◆ I2C_uninit()

void I2C_uninit ( )

Disable I2c module on arduino board (releasing pull-ups, and TWI control)

Returns: nothing

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◆ I2C_wr8()

bool I2C_wr8 ( const uint8_t dat )

Send byte on bus.

Parameters

[in] dat - data to be sent

Returns: true if data sent acknowledged (false otherwise)

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◆ I2C_write()

I2C_STATUS I2C_write	(	I2C_SLAVE *	slave,
		const uint16_t	reg_addr,
		uint8_t *	data,
		const uint16_t	bytes
	)

This function writes the provided data to the address specified.

Parameters

[in,out]	slave	- pointer to the I2C slave structure
[in]	reg_addr	- register address in register map
[in]	data	- pointer to the first byte of a block of data to write
[in]	bytes	- indicates how many bytes of data to write

Returns: I2C_STATUS status of write attempt

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◆ I2C_write_next()

I2C_STATUS I2C_write_next	(	I2C_SLAVE *	slave,
		uint8_t *	data,
		const uint16_t	bytes
	)

inline

This inline is a wrapper to I2C_write in case of contigous operations.

GCC Attributes:: inline

Parameters

[in,out]	slave	- pointer to the I2C slave structure
[in]	data	- pointer to the first byte of a block of data to write
[in]	bytes	- indicates how many bytes of data to write

Returns: I2C_STATUS status of write attempt

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Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ __attribute__

◆ DEF_CI2C_NB_RETRIES

◆ DEF_CI2C_TIMEOUT

Typedef Documentation

◆ ci2c_fct_ptr

◆ I2C_INT_SIZE

◆ I2C_RW

◆ I2C_SLAVE

◆ I2C_SPEED

◆ I2C_STATUS

Enumeration Type Documentation

◆ enI2C_INT_SIZE

◆ enI2C_RW

◆ enI2C_SPEED

◆ enI2C_STATUS

Function Documentation

◆ I2C_init()

◆ I2C_is_busy()

◆ I2C_rd8()

◆ I2C_read()

◆ I2C_read_next()

◆ I2C_reset()

◆ I2C_set_retries()

◆ I2C_set_speed()

◆ I2C_set_timeout()

◆ I2C_slave_get_addr()

◆ I2C_slave_get_reg_addr()

◆ I2C_slave_get_reg_size()

◆ I2C_slave_init()

◆ I2C_slave_set_addr()

◆ I2C_slave_set_reg_size()

◆ I2C_slave_set_rw_func()

◆ I2C_sndAddr()

◆ I2C_start()

◆ I2C_stop()

◆ I2C_uninit()

◆ I2C_wr8()

◆ I2C_write()

◆ I2C_write_next()

◆ attribute