This page gives an overview of the bare-metal driver support for the AXI I2C controller.

1 Introduction
2 Driver Implementation
3 Features
4 Known issues and Limitations
5 Example Applications
- 5.1 Links to Examples
- 5.2 Example Application Usage
6 ChangeLog
- 6.1 2025.2
- 6.2 2025.1
- 6.3 2024.2
- 6.4 2024.1
- 6.5 2023.2
- 6.6 2023.1
- 6.7 2022.2
- 6.8 2022.1
- 6.9 2021.2
- 6.10 2021.2
- 6.11 2021.1
- 6.12 2020.2
- 6.13 2020.1
- 6.14 2019.2
- 6.15 2019.1
- 6.16 2018.3
- 6.17 2018.2
- 6.18 2018.1
- 6.19 2017.4
- 6.20 2017.3
- 6.21 2017.2
- 6.22 2017.1

Introduction

The LogiCORE™ IP AXI IIC Bus Interface connects to the AMBA® AXI specification and provides a low-speed, two-wire,
serial bus interface to a large number of popular devices. This product specification defines the architecture,
hardware (signal) interface, software (register) interface, and parameterization options for the AXI IIC Bus Interface module.

Driver Sources

The source code for the driver is included with the Vitis Unified Software Platform installation, as well as being available in the Xilinx Github repository.

Driver Name	Path in Vitis	Path in Github

Driver Name	Path in Vitis	Path in Github
iic	<Vitis Install Directory>/data/embedded/XilinxProcessorIPLib/drivers/iic	https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/iic

Note: To view the sources for a particular release, use the rel-version tag in github. For example, for the 2020.1 release, the proper version of the code is: https://github.com/Xilinx/embeddedsw/tree/xilinx-v2020.1/XilinxProcessorIPLib/drivers/iic

The driver source code is organized into different folders. The table below shows the ospipsv driver source organization.

Directory	Description

Directory	Description
doc	Provides the API and data structure details
data	Driver .tcl, .yaml and .mdd file
examples	Example applications that show how to use the driver features
src	Driver source files, make and cmakelists file

Note: AMD Xilinx embeddedsw build flow has been changed from 2023.2 release to adapt to the new system device tree based flow. For further information, refer to the wiki link Porting embeddedsw components to system device tree (SDT) based flow
The .yaml(in data folder) and CMakeLists.txt(in src folder) files are needed for the System Device Tree based flow. The Driver .tcl and .mdd files are for the older build flow which will be deprecated in future.

Driver Implementation

For a full list of features supported by this IP, please refer https://www.xilinx.com/support/documentation/ip_documentation/axi_iic/v2_0/pg090-axi-iic.pdf

Features

• Register access through AXI4-Lite interface
• Master or slave operation
• Multi-master operation
• Software selectable acknowledge bit
• Arbitration lost interrupt with automatic mode switching from master to slave
• Calling address identification interrupt with automatic mode switching from master to slave
• START and STOP signal generation and detection
• Repeated START signal generation
• Acknowledge bit generation and detection
• Bus busy detection
• Fast-Mode Plus 1 MHz, Fast Mode 400 kHz, or Standard Mode 100 kHz operation
• 7-bit or 10-bit addressing
• General call enable or disable
• Transmit and receive FIFOs – 16 bytes deep
• Throttling
• General purpose output, 1-bit to 8 bits wide
• Dynamic Start and Stop generation

Known issues and Limitations

None.

Example Applications

Refer to the driver examples directory for various example applications that exercise the different features of the driver. Each application is linked in the table below. The following sections describe the usage and expected output of the various applications. These example applications can be imported into the Vitis IDE from the Board Support Package settings tab.

Links to Examples

Examples path: https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/iic/examples

Test name	Example source	Description

Test name	Example source	Description
AXI IIC eeprom example in dynamic mode	xiic_dynamic_eeprom_example.c	This example does read/writes using AXI IIC dynamic mode
AXI IIC eeprom example in standard mode	xiic_eeprom_example.c	This example does read/writes using AXI IIC standard mode
AXI IIC repeated start example	xiic_repeated_start_example.c	This example does read/writes with repeated start.
AXI IIC low_level_dynamic_eeprom_exampl	xiic_low_level_dynamic_eeprom_example.c	This example does polled read/writes using AXI IIC dynamic mode
AXI IIC ^{low_level_eeprom_example}	xiic_low_level_eeprom_example.c	This example does polled read/writes using AXI IIC standard mode
AXI IIC ^{low_level_tempsensor_example}	xiic_low_level_tempsensor_example.c	^{This example only performs read operations (receive) from the} ^{iic temperature sensor of the platform.}
AXI IIC ^{multi_master_example}	xiic_multi_master_example.c	^{This example writes/reads from the lower 256 bytes of the IIC EEPROMS.}
AXI IIC ^{selftest_example}	xiic_selftest_example.c	^{This example performs the basic selftest using the driver.}
AXI IIC ^{slave_example}	xiic_slave_example.c	^{This example consists of a Interrupt mode design which shows the usage of the Xilinx iic device and XIic driver to exercise the slave functionality of the iic device.}
AXI IIC ^{tempsensor_example}	xiic_tempsensor_example.c	^{This example only performs read operations(receive) from the iic temperature sensor of the platform.}
AXI IIC ^{tenbitaddr_example}	xiic_tenbitaddr_example.c	^{This example consists of a Interrupt mode design which shows the usage of the Xilinx iic device and XIic driver to exercise the 10-bit Address functionality of the iic device.}

Example Application Usage

AXI IIC eeprom example in dynamic mode

This example does read/writes using AXI IIC dynamic mode

Expected Output

Successfully ran IIC dynamic eeprom Example

AXI IIC eeprom example in standard mode

This example does read/writes using AXI IIC standard mode

Expected Output

Successfully ran IIC eeprom Example

AXI IIC repeated start example

This example does read/writes with repeated start.

Expected Output

Successfully ran IIC repeated start Example

ChangeLog

2025.2

embeddedsw/doc/ChangeLog at xlnx_rel_v2025.2 · Xilinx/embeddedsw · GitHub

2025.1

https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2025.1/doc/ChangeLog#L164

2024.2

https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2024.2/doc/ChangeLog#L572

2024.1

https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2024.1/doc/ChangeLog#L453

2023.2

https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2023.2/doc/ChangeLog#L39

2023.1

https://github.com/Xilinx/embeddedsw/blob/xilinx_v2023.1/doc/ChangeLog#L2108

2022.2

https://github.com/Xilinx/embeddedsw/blob/xilinx_v2022.2/doc/ChangeLog#L1010

2022.1

https://github.com/Xilinx/embeddedsw/blob/xilinx_v2022.1/doc/ChangeLog#L37

2021.2

https://github.com/Xilinx/embeddedsw/blob/xilinx_v2022.1/doc/ChangeLog#L37

2021.2

None

2021.1

https://github.com/Xilinx/embeddedsw/blob/xilinx_v2021.1/doc/ChangeLog#L441

2020.2

https://github.com/Xilinx/embeddedsw/blob/xilinx-v2020.2/doc/ChangeLog#L618

2020.1

None

2019.2

None

2019.1

None

2018.3

None

2018.2

None

2018.1

None

2017.4

None

2017.3

None

2017.2

None

2017.1

None

AXI-I2C standalone driver

Table of Contents

Introduction

Driver Implementation

Features

Known issues and Limitations

Example Applications

Links to Examples

Example Application Usage

ChangeLog

2025.2

2025.1

2024.2

2024.1

2023.2

2023.1

2022.2

2022.1

2021.2

2021.2

2021.1

2020.2

2020.1

2019.2

2019.1

2018.3

2018.2

2018.1

2017.4

2017.3

2017.2

2017.1