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Ethernet Core FreeRTOS lwIP mbedtls library

This repo comprises core components needed for ethernet connectivity support. The library bundles FreeRTOS, lwIP TCP/IP stack, mbed TLS for security, ethernet connection manager (ECM), secure sockets interface, connectivity utilities and configuration files.

Features and functionality

This library provides the configuration files for lwIP network stack and mbedTLS security stack. It also includes following libraries as dependees in the ModusToolbox™ manifest system. Using ModusToolbox™ manifest system the dependees are automatically pulled when an application uses this library in ModusToolbox™ environment.

  • FreeRTOS for Infineon MCUs: FreeRTOS kernel, distributed as standard C source files with the configuration header file, for use with the Infineon MCUs. See the README for details.

  • CLib FreeRTOS support library: This library provides the necessary hooks to make C library functions such as malloc and free thread-safe. This implementation is specific to FreeRTOS; this library is required for building your application. See the CLib FreeRTOS support library web site for details.

  • lwIP: A lightweight open-source TCP/IP stack, version: 2.1.2. See the lwIP web site for details.

    Note: Using this library in a project will cause lwIP to be downloaded on your computer. It is your responsibility to understand and accept the lwIP license.

  • lwIP FreeRTOS Integration Library: This repo contains the FreeRTOS dependencies required by the lwIP stack. See lwIP FreeRTOS Integration Library for details.

  • lwIP Network Interface Integration Library: This library is an integration layer that links the lwIP network stack with the underlying ethernet driver. See lwIP Network Interface Integration Library for details.

  • mbed TLS: An open-source, portable, easy-to-use, readable and flexible SSL library that has cryptographic capabilities, version: 3.4.0. See the mbed TLS web site for details.

    Note: Using this library in a project will cause mbed TLS to be downloaded on your computer. It is your responsibility to understand and accept the mbed TLS license and regional use restrictions (including abiding by all applicable export control laws).

  • RTOS Abstraction Layer: The RTOS abstraction APIs allow the middleware to be written to be RTOS-aware, but without depending on any particular RTOS. See RTOS Abstraction Layer repository for details.

  • Ethernet Connection Manager (ECM): ECM can be used to establish and monitor ethernet connections on Infineon platforms that support Ethernet connectivity. See the Ethernet Connection Manager repository for details.

  • Secure Sockets: Network abstraction APIs for the underlying lwIP network stack and mbed TLS security library. The secure sockets library eases application development by exposing a socket-like interface for both secure and non-secure socket communication. See the Secure Sockets repository for details.

  • Connectivity Utilities: The connectivity utilities library is a collection of general purpose middleware utilities. See the Connectivity Utilities repository for details.

  • Predefined configuration files: For FreeRTOS, lwIP, and mbed TLS for typical embedded IoT use cases. See Quick Start section for details.

Supported platforms

This library and its features are supported on the following platforms:

Quick start

A set of pre-defined configuration files have been bundled with this library for lwIP, and mbed TLS. These files are located in the configs folder.

You should do the following:

  1. Copy lwipopts.h, and mbedtls_user_config.h files from the configs directory to the top-level code example directory in the project.

  2. Copy the FreeRTOSConfig.h file from the freertos/Source/portable/COMPONENT_$(CORE) folder to your project, where $(CORE) is the target Arm® Cortex®-M CPU core (CM0, CM0P, CM4, CM33, CR4 or CM7)

  3. Modify configUSE_TICKLESS_IDLE define value to 0 in FreeRTOSConfig.h file. On XMC Kits, ethernet phy chip is not capable of waking MCU from deep sleep. Hence FreeRTOS tickless idle feature need to be disabled.

  4. Configure the MBEDTLS_USER_CONFIG_FILE C macro to mbedtls_user_config.h in the Makefile to provide the user configuration to the mbed TLS library. The Makefile entry should look like as follows:

    DEFINES+=MBEDTLS_USER_CONFIG_FILE='"mbedtls_user_config.h"'

  5. Ethernet Connection Manager (ECM) by default does the pin configuration for ETH1 interface on KIT-XMC72-EVK kit. If user wants to use ETH0 interface on KIT-XMC72-EVK kit or use any other kit, then he needs to provide the pin configuration. To do that user needs to copy cy_eth_user_config.h from ethernet-connection-manager/configs directory to the root directory of the application and modify it with required pin configurations for the platform/interface to be used.

  6. Add the CYBSP_ETHERNET_CAPABLE build configuration to enable the ethernet functionality. The Makefile entry should look like as follows:

    DEFINES+=CYBSP_ETHERNET_CAPABLE

  7. Add the CY_RTOS_AWARE build configuration to inform the HAL that an RTOS environment is being used. The Makefile entry should look like as follows:

    DEFINES+=CY_RTOS_AWARE

  8. If your application uses automatic private IP addressing (Auto IP), enable LWIP_AUTOIP and LWIP_DHCP_AUTOIP_COOP in lwipopts.h like as follows:

    #define AUTOIP 1
#define LWIP_DHCP_AUTOIP_COOP 1

  9. Add the following to COMPONENTS in the code example project's Makefile: FREERTOS, LWIP, and MBEDTLS.

    For example:

    COMPONENTS=FREERTOS LWIP MBEDTLS

  10. All the log messages are disabled by default. Do the following to enable log messages:

  11. Add the ENABLE_CONNECTIVITY_MIDDLEWARE_LOGS macro to the DEFINES in the code example's Makefile to enable logs for lwIP network interface integration library. The Makefile entry should look like as follows:

    DEFINES+=ENABLE_CONNECTIVITY_MIDDLEWARE_LOGS

  12. Add the ENABLE_ECM_LOGS macro to the DEFINES in the code example's Makefile to enable logs for ethernet connection manager library. The Makefile entry should look like as follows:

    DEFINES+=ENABLE_ECM_LOGS

  13. Add the ENABLE_SECURE_SOCKETS_LOGS macro to the DEFINES in the code example's Makefile to enable logs for secure sockets library. The Makefile entry should look like as follows:

    DEFINES+=ENABLE_SECURE_SOCKETS_LOGS

  14. Call the cy_log_init() function provided by the cy-log module. cy-log is part of the connectivity-utilities library. See connectivity-utilities library API documentation for cy-log details.

Secure sockets, lwIP, and mbed TLS libraries contain reference and test applications. To ensure that these applications do not conflict with the code examples, a .cyignore file is also included with this library.

Additional information