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dgarskedgarske
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Merge pull request #351 from gojimmypi/PR-Espressif
Initial Infineon I2C TPM support for Espressif ESP32
2 parents 705c29d + 5aff694 commit 2d64093

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‎IDE/Espressif/CMakeLists.txt‎

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# wolfTPM Espressif Example Project CMakeLists.txt
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# v1.0
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#
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# The following lines of boilerplate have to be in your project's
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# CMakeLists in this exact order for cmake to work correctly
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cmake_minimum_required(VERSION 3.16)
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# The wolfTPM CMake file should be able to find the source code.
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# Otherwise, assign an environment variable or set it here:
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#
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# set(WOLFTPM_ROOT "~/workspace/wolftpm-other-source")
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#
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# Optional WOLFSSL_CMAKE_SYSTEM_NAME detection to find
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# USE_MY_PRIVATE_CONFIG path for my_private_config.h
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#
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# Expected path varies:
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#
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# WSL: /mnt/c/workspace
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# Linux: ~/workspace
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# Windows: C:\workspace
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#
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if(WIN32)
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# Windows-specific configuration here
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWOLFSSL_CMAKE_SYSTEM_NAME_WINDOWS")
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message("Detected Windows")
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endif()
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if(CMAKE_HOST_UNIX)
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message("Detected UNIX")
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endif()
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if(APPLE)
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message("Detected APPLE")
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endif()
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if(CMAKE_HOST_UNIX AND (NOT APPLE) AND EXISTS "/proc/sys/fs/binfmt_misc/WSLInterop")
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# Windows-specific configuration here
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWOLFSSL_CMAKE_SYSTEM_NAME_WSL")
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message("Detected WSL")
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endif()
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if(CMAKE_HOST_UNIX AND (NOT APPLE) AND (NOT WIN32))
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# Windows-specific configuration here
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWOLFSSL_CMAKE_SYSTEM_NAME_LINUX")
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message("Detected Linux")
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endif()
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if(APPLE)
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# Windows-specific configuration here
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWOLFSSL_CMAKE_SYSTEM_NAME_APPLE")
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message("Detected Apple")
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endif()
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# End optional WOLFSSL_CMAKE_SYSTEM_NAME
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# Check that there are no conflicting wolfSSL components.
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#
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# The ESP Registry Component will be in ./managed_components/wolfssl__wolfssl
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# The local component wolfSSL directory will be in ./components/wolfssl
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if( EXISTS "${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolfssl" AND EXISTS "${CMAKE_HOME_DIRECTORY}/components/wolfssl" )
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# These exclude statements don't seem to be honored by the $ENV{IDF_PATH}/tools/cmake/project.cmake'
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# add_subdirectory("${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolfssl" EXCLUDE_FROM_ALL)
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# add_subdirectory("${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolfssl/include" EXCLUDE_FROM_ALL)
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# So we'll error out and let the user decide how to proceed:
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message(WARNING "\nFound wolfSSL components in\n"
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"./managed_components/wolfssl__wolfssl\n"
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"and\n"
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"./components/wolfssl\n"
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"in project directory: \n"
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"${CMAKE_HOME_DIRECTORY}")
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message(FATAL_ERROR "\nPlease use either the ESP Registry Managed Component or the wolfSSL component directory but not both.\n"
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"If removing the ./managed_components/wolfssl__wolfssl directory, remember to also remove "
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"or rename the idf_component.yml file typically found in ./main/")
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else()
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message(STATUS "No conflicting wolfSSL components found.")
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endif()
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# Check that there are no conflicting wolfTPM components.
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#
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# The ESP Registry Component will be in ./managed_components/wolfssl__wolftpm
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# The local component wolfTPM directory will be in ./components/wolftpm
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if( EXISTS "${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolftpm" AND EXISTS "${CMAKE_HOME_DIRECTORY}/components/wolftpm" )
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# These exclude statements don't seem to be honored by the $ENV{IDF_PATH}/tools/cmake/project.cmake'
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# add_subdirectory("${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolftpm" EXCLUDE_FROM_ALL)
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# add_subdirectory("${CMAKE_HOME_DIRECTORY}/managed_components/wolfssl__wolftpm/include" EXCLUDE_FROM_ALL)
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# So we'll error out and let the user decide how to proceed:
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message(WARNING "\nFound wolfTPM components in\n"
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"./managed_components/wolfssl__wolftpm\n"
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"and\n"
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"./components/wolftpm\n"
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"in project directory: \n"
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"${CMAKE_HOME_DIRECTORY}")
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message(FATAL_ERROR "\nPlease use either the ESP Registry Managed Component or the wolfTPM component directory but not both.\n"
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"If removing the ./managed_components/wolfssl__wolftpm directory, remember to also remove "
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"or rename the idf_component.yml file typically found in ./main/")
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else()
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message(STATUS "No conflicting wolfTPM components found.")
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endif()
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include($ENV{IDF_PATH}/tools/cmake/project.cmake)
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project(wolfTPM_test)

‎IDE/Espressif/README.md‎

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# wolfTPM for Espressif
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Initial minimum memory requirements: 35KB Stack. See `sdkconfig.defaults`.
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Current memory assigned: 50960
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## Pin assignments
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**Note:** The following pin assignments are used by default, you can change these in the `menuconfig` .
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| | SDA | SCL |
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| ---------------- | -------------- | -------------- |
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| ESP I2C Master | I2C_MASTER_SDA | I2C_MASTER_SCL |
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| TPM2 Device | SDA | SCL |
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For the actual default value of `I2C_MASTER_SDA` and `I2C_MASTER_SCL` see `Example Configuration` in `menuconfig`.
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**Note:** There's no need to add an external pull-up resistors for SDA/SCL pin, because the driver will enable the internal pull-up resistors.
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## Troubleshooting
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If problems are encountered with the I2C module:
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- Beware that printing to the UART during an I2C transaction may affect timing and cause errors.
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- Ensure the TPM module has been reset after flash updated.
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- Check wiring. `SCL` to `SCL`, `SDA` to `SDA`. Probably best to ensure GND is connected. Vcc is 3.3v only.
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- Ensure the proper pins are connected on the ESP32. SCL default is `GPIO 19`; SDA default is `GPIO 18`.
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- Test with only a single I2C device before testing concurrent with other I2C boards.
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- When using multiple I2C boards, check for appropriate pullups. See data sheet.
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- Reset TPM device again. Press button on TPM SLB9673 eval board or set TPM pin 17 as appropriate.
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-

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