I2C-PS standalone driver
- Confluence Wiki Admin (Unlicensed)
- Alvin Paul P
- Manikanta Guntupalli
This page gives an overview of the bare-metal driver support for the PS I2C controller.
Table of Contents
Introduction
The I2C controllers can function as a master or a slave in a multi-master design. They can
operate over a clock frequency range up to 400 kb/s.
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 |
|---|---|---|
| iicps | <Vitis Install Directory>/data/embedded/XilinxProcessorIPLib/drivers/iicps | https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/iicps |
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/iicps
The driver source code is organized into different folders. The table below shows the ospipsv driver source organization.
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 Chapter 69: I2C Controller in Versal TRM
Features
I2C bus specification version 2Supports 16-byte FIFO
Programmable normal and fast bus data rates
Master mode
Write transfer
Read transfer
Extended address support
Support HOLD for slow processor service
Supports TO interrupt flag to avoid stall condition
Slave monitor mode
Slave mode
Slave transmitter
Slave receiver
Extended address support (10-bit address)
Fully programmable slave response address
Supports HOLD to prevent overflow condition
Supports TO interrupt flag to avoid stall condition
Software can poll for status or function as interrupt-driven device
Programmable interrupt generation
Known issues and Limitations
Multi-master configuration works only if all the participating masters are operating at the same frequency.
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/iicps/examples
| Test name | Example source | Description |
|---|---|---|
| IICPS eeprom interrupt mode example | xiicps_eeprom_intr_example.c | This example does eeprom read/writes using interrupts. |
| IICPS eeprom polled mode example | xiicps_eeprom_polled_example.c | This example does eeprom read/writes using polling. |
| IICPS slave monitor mode example | xiicps_slave_monitor_example.c | This example does slave monitoring of an I2C slave device. |
| IICPS intr_slave_example | xiicps_intr_master_example.c | This example shows the usage of the iic device as slave for interrupt-driven transfers using the external Aardvark iic analyzer as the master. |
| IICPS intr_multi_master_example | xiicps_intr_multi_master_example.c | This example shows the usage of the iic device as multimaster in interrupt-driven mode. |
| IICPS intr_slave_example | xiicps_intr_slave_example.c | This example shows the usage of the iic device as slave for interrupt-driven transfers using the external Aardvark iic analyzer as the master. |
| IICPS polled_slave_example | xiicps_polled_master_example.c | This example shows the usage of the iic device as slave in polled mode. |
| IICPS intr_multi_master_example | xiicps_polled_multi_master_example.c | This example shows the usage of the iic device in polled mode as multimaster |
| IICPS polled_slave_example | xiicps_polled_slave_example.c | This example shows the usage of the iic device as slave in polled mode. |
| IICPS slave_monitor_example | xiicps_repeated_start_example.c | This example shows the usage of the iic device as master to check slave's availability. |
| IICPS selftest_example | xiicps_selftest_example.c | This example performs the basic selftest using the driver. |
| IICPS intr_master_example | xiicps_smbus_intr_master_example.c | This example shows the usage of the iic device as master in interrupt-driven mode. |
| IICPS intr_slave_example | xiicps_smbus_intr_slave_example.c | This example shows the usage of the iic device as slave for interrupt-driven transfers using the external Aardvark iic analyzer as the master. |
| IICPS polled_master_example | xiicps_smbus_polled_master_example.c | This example shows the usage of the iic device in polled mode as master. |
| IICPS polled_slave_example | xiicps_smbus_polled_slave_example.c | This example shows the usage of the iic driver in polled mode. The slave used is an EEPROM. |
Example Application Usage
IICPS eeprom interrupt mode example
This example does eeprom read/writes using interrupts.
Expected Output
IIC EEPROM Interrupt Example Test Page size 16 Successfully ran IIC EEPROM Interrupt Example Test
IICPS eeprom polled mode example
This example does eeprom read/writes using polling.
Expected Output
IIC EEPROM Polled Mode Example Test Page size 16 Successfully ran IIC EEPROM Polled Mode Example Test
IICPS slave monitor mode example
This example does slave monitoring of an I2C slave device.
Expected Output
IIC Slave Monitor Example Test Successfully ran IIC Slave Monitor Example Test
Example Design Architecture
NA
ChangeLog
2024.1
https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2024.1/doc/ChangeLog#L457
2023.2
https://github.com/Xilinx/embeddedsw/blob/xlnx_rel_v2023.2/doc/ChangeLog#L44
2023.1
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2023.1/doc/ChangeLog#L221
2022.2
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2022.2/doc/ChangeLog#L103
2022.1
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2022.1/doc/ChangeLog#L34
2021.2
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2021.2/doc/ChangeLog#L214
2021.1
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2021.1/doc/ChangeLog#L445
2020.2
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2020.2/doc/ChangeLog#L207
2020.1
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2020.1/doc/ChangeLog#L62
2019.2
None
2019.1
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2019.1/doc/ChangeLog#L95
2018.3
None
2018.2
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2018.2/doc/ChangeLog#L44
2018.1
None
2017.4
None
2017.3
None
2017.2
None
2017.1
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2017.1/doc/ChangeLog#L254
2016.4
None
2016.3
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2016.3/doc/ChangeLog#L122
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