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2 Rev. 0.1 3. Hardware Access Layer CMSIS is the Cortex Microcontroller Software Interfac e Standard, and the Hardware Access Layer (HAL) is a defined part of this standard. The HAL provides an access layer for the SiM3xxxx device registers. The functions and macros are non-blocking and simple; they cannot return error codes, so they are de signed to never fail. The HAL is designed to replace the individual bit field accesses of the module with a function name that describes the action the bit is controlling. Note: HAL functions and macros are not designed to be thread-s afe. These routines do not disable interrupts during non- monotonic register modifications. The HAL sits one layer above the hardware and is the only code that accesses the registers directly. More complex firmware systems like a Real Time Operating System (RTOS) or code example call the HAL and CMSIS routines. 4. Code Examples The code examples are simple and co mplete examples that illustrate a nd highlight the peripheral modes and features using the HAL. They are also modular so code can be copied into an application base, making peripheral- specific code development easy. 5. si32Library A 32-bit platform with large memory enables a big and complex firmware system on the device. This complexity can slow development, as firmware consists of more layers with interweaving tasks and threads that are more difficult to create and debug. The si32Library is a set of flexible, reusable, and portable source modules enabling core application level functionality for Silicon Laboratories 32-bit Precision32™ MCUs. It includes facilities for debug logging, memory allocation, data collections, data transfers, and coo perative multitasking. The si32Library package provides working abstractions of the hardware layer, reduces coding effort, and provides structure to aid and speed up top- layer application development.
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4 Rev. 0.1 CONTACT INFORMATION Silicon Laboratories Inc.
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