Driver for the I2C module. More...

#include "i2c.h"
#include "HL_system.h"
#include "database.h"
#include "diag.h"
#include "dma.h"
#include "fstd_types.h"
#include "fsystem.h"
#include "mcu.h"
#include "os.h"
#include <stdbool.h>
#include <stdint.h>

Include dependency graph for i2c.c:

Go to the source code of this file.

Functions
static uint32_t	I2C_GetWordTransmitTime (i2cBASE_t *pI2cInterface)
	Return transmit time of a word in microseconds. More...

static bool	I2C_WaitTransmit (i2cBASE_t *pI2cInterface, uint32_t timeout_us)
	Waits for the I2C Tx buffer to be empty. More...

static bool	I2C_WaitStop (i2cBASE_t *pI2cInterface, uint32_t timeout_us)
	Waits for a stop condition to be detected. More...

static uint32_t	I2C_WaitForTxCompletedNotification (void)
	Wait for the I2C transmit communication to complete, using notifications. More...

static uint32_t	I2C_WaitForRxCompletedNotification (void)
	Wait for the I2C receive communication to complete, using notifications. More...

static void	I2C_ClearNotifications (void)
	Clear pending notifications. More...

void	I2C_Initialize (void)
	Initialize the I2C hardware with dedicated HAL functions. Has to be called before any call to the rest of this API. More...

STD_RETURN_TYPE_e	I2C_Read (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytes, uint8_t readData)
	reads from an I2C slave, no register address written first, blocking. More...

STD_RETURN_TYPE_e	I2C_Write (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytes, uint8_t writeData)
	writes to an I2C slave, no register address written first, blocking. More...

STD_RETURN_TYPE_e	I2C_WriteRead (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytesWrite, uint8_t writeData, uint32_t nrBytesRead, uint8_t *readData)
	reads from an I2C slave, blocking. More...

STD_RETURN_TYPE_e	I2C_ReadDma (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytes, uint8_t readData)
	reads from an I2C slave, no register address written first, using DMA. More...

STD_RETURN_TYPE_e	I2C_WriteDma (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytes, uint8_t writeData)
	writes to an I2C slave, no register address written first, using DMA. More...

STD_RETURN_TYPE_e	I2C_WriteReadDma (i2cBASE_t pI2cInterface, uint32_t slaveAddress, uint32_t nrBytesWrite, uint8_t writeData, uint32_t nrBytesRead, uint8_t *readData)
	reads from an I2C slave, using DMA. More...

uint8_t	I2C_ReadLastRxByte (i2cBASE_t *pI2cInterface)
	Used to read last byte received per I2C. More...

bool	I2C_WaitReceive (i2cBASE_t *pI2cInterface, uint32_t timeout_us)
	Waits for the I2C Rx buffer to be full. More...

Variables
uint8_t	i2c_rxLastByteInterface1 = 0u

uint8_t	i2c_rxLastByteInterface2 = 0u

Detailed Description

Driver for the I2C module.

Copyright: © 2010 - 2023, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. All rights reserved.

SPDX-License-Identifier: BSD-3-Clause

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

We kindly request you to use one or more of the following phrases to refer to foxBMS in your hardware, software, documentation or advertising materials:

″This product uses parts of foxBMS®″
″This product includes parts of foxBMS®″
″This product is derived from foxBMS®″

Author: foxBMS Team

Date: 2021-07-22 (date of creation)

Updated: 2023-02-03 (date of last update)

Version: v1.5.0

Prefix: I2C

Definition in file i2c.c.

Function Documentation

◆ I2C_ClearNotifications()

static void I2C_ClearNotifications ( void )

static

Clear pending notifications.

Definition at line 216 of file i2c.c.

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◆ I2C_GetWordTransmitTime()

static uint32_t I2C_GetWordTransmitTime ( i2cBASE_t * pI2cInterface )

static

Return transmit time of a word in microseconds.

The function uses the clock settings of the interface to determine the time needed to transmit one word. Word means one byte + the ACK bit.

Parameters

pI2cInterface I2C interface to use

Returns: time in microseconds needed to transmit a byte on the I2C interface

Definition at line 137 of file i2c.c.

◆ I2C_Initialize()

void I2C_Initialize ( void )

Initialize the I2C hardware with dedicated HAL functions. Has to be called before any call to the rest of this API.

Definition at line 222 of file i2c.c.

◆ I2C_Read()

STD_RETURN_TYPE_e I2C_Read	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytes,
		uint8_t *	readData
	)

reads from an I2C slave, no register address written first, blocking.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytes	number of registers to read
readData	buffer containing the read data

Returns: STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 226 of file i2c.c.

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◆ I2C_ReadDma()

STD_RETURN_TYPE_e I2C_ReadDma	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytes,
		uint8_t *	readData
	)

reads from an I2C slave, no register address written first, using DMA.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytes	number of registers to read
readData	buffer containing the read data

Returns: STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 415 of file i2c.c.

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◆ I2C_ReadLastRxByte()

uint8_t I2C_ReadLastRxByte ( i2cBASE_t * pI2cInterface )

Used to read last byte received per I2C.

This function must be called in the DMA Rx callback. It returns the last byte received per I2C

Parameters

pI2cInterface I2C interface used

Returns: last byte received on the I2C bus

Definition at line 766 of file i2c.c.

◆ I2C_WaitForRxCompletedNotification()

static uint32_t I2C_WaitForRxCompletedNotification ( void )

static

Wait for the I2C receive communication to complete, using notifications.

Returns: I2C_RX_NOTIFIED_VALUE if notification received, I2C_NO_NOTIFIED_VALUE if timeout reached

Suspend task and wait for I2C DMA RX finished notification, clear notification value on entry and exit

Definition at line 206 of file i2c.c.

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◆ I2C_WaitForTxCompletedNotification()

static uint32_t I2C_WaitForTxCompletedNotification ( void )

static

Wait for the I2C transmit communication to complete, using notifications.

Returns: I2C_TX_NOTIFIED_VALUE if notification received, I2C_NO_NOTIFIED_VALUE if timeout reached

Suspend task and wait for I2C DMA TX finished notification, clear notification value on entry and exit

Definition at line 196 of file i2c.c.

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◆ I2C_WaitReceive()

bool I2C_WaitReceive	(	i2cBASE_t *	pI2cInterface,
		uint32_t	timeout_us
	)

Waits for the I2C Rx buffer to be full.

When the buffer is full, the received byte can be read. If the buffer is full before timeout_us microseconds are elapsed, the function returns true, false otherwise. The function also returns false if a NACK condition is detected.

Parameters

pI2cInterface	I2C interface to use
timeout_us	time in microseconds to wait until the buffer is full

Returns: true if buffer is full within timeout, false otherwise

Definition at line 772 of file i2c.c.

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◆ I2C_WaitStop()

static bool I2C_WaitStop	(	i2cBASE_t *	pI2cInterface,
		uint32_t	timeout_us
	)

static

Waits for a stop condition to be detected.

When a stop condition is issued, this function waits until the stop condition is detected on the bus. This means that that transmission is finished. If stop is detected before timeout_us microseconds are elapsed, the function returns true, false otherwise.

Parameters

pI2cInterface	I2C interface to use
timeout_us	time in microseconds to wait until stop is detected

Returns: true if stop is detected within timeout, false otherwise

Definition at line 179 of file i2c.c.

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◆ I2C_WaitTransmit()

static bool I2C_WaitTransmit	(	i2cBASE_t *	pI2cInterface,
		uint32_t	timeout_us
	)

static

Waits for the I2C Tx buffer to be empty.

When the buffer is empty, the next byte can be sent. If the buffer is empty before timeout_us microseconds are elapsed, the function returns true, false otherwise. The function also returns false if a NACK condition is detected.

Parameters

pI2cInterface	I2C interface to use
timeout_us	time in microseconds to wait until the buffer is empty

Returns: true if buffer is empty within timeout, false otherwise

Definition at line 161 of file i2c.c.

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◆ I2C_Write()

STD_RETURN_TYPE_e I2C_Write	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytes,
		uint8_t *	writeData
	)

writes to an I2C slave, no register address written first, blocking.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytes	number of registers to write
writeData	buffer containing the data to write

Returns: STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 283 of file i2c.c.

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◆ I2C_WriteDma()

STD_RETURN_TYPE_e I2C_WriteDma	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytes,
		uint8_t *	writeData
	)

writes to an I2C slave, no register address written first, using DMA.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytes	number of registers to write
writeData	buffer containing the data to write

Returns: retVal STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 510 of file i2c.c.

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◆ I2C_WriteRead()

STD_RETURN_TYPE_e I2C_WriteRead	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytesWrite,
		uint8_t *	writeData,
		uint32_t	nrBytesRead,
		uint8_t *	readData
	)

reads from an I2C slave, blocking.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytesWrite	number of registers to read
writeData	buffer containing the read data
nrBytesRead	number of registers to read
readData	buffer containing the read data

Returns: STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 335 of file i2c.c.

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◆ I2C_WriteReadDma()

STD_RETURN_TYPE_e I2C_WriteReadDma	(	i2cBASE_t *	pI2cInterface,
		uint32_t	slaveAddress,
		uint32_t	nrBytesWrite,
		uint8_t *	writeData,
		uint32_t	nrBytesRead,
		uint8_t *	readData
	)

reads from an I2C slave, using DMA.

Parameters

pI2cInterface	I2C interface to use
slaveAddress	address of slave to communicate with
nrBytesWrite	number of registers to read
writeData	buffer containing the read data
nrBytesRead	number of registers to read
readData	buffer containing the read data

Returns: STD_OK if transmission OK, STD_NOT_OK otherwise

Definition at line 599 of file i2c.c.

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Variable Documentation

◆ i2c_rxLastByteInterface1

uint8_t i2c_rxLastByteInterface1 = 0u

Definition at line 75 of file i2c.c.

◆ i2c_rxLastByteInterface2

uint8_t i2c_rxLastByteInterface2 = 0u

Definition at line 77 of file i2c.c.

Functions

Variables

Detailed Description

Function Documentation

◆ I2C_ClearNotifications()

◆ I2C_GetWordTransmitTime()

◆ I2C_Initialize()

◆ I2C_Read()

◆ I2C_ReadDma()

◆ I2C_ReadLastRxByte()

◆ I2C_WaitForRxCompletedNotification()

◆ I2C_WaitForTxCompletedNotification()

◆ I2C_WaitReceive()

◆ I2C_WaitStop()

◆ I2C_WaitTransmit()

◆ I2C_Write()

◆ I2C_WriteDma()

◆ I2C_WriteRead()

◆ I2C_WriteReadDma()

Variable Documentation

◆ i2c_rxLastByteInterface1

◆ i2c_rxLastByteInterface2