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SWRU271H–October 2010–Revised April 2019
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The Operating System Abstraction Layer (OSAL)
Chapter 3
SWRU271H–October 2010–Revised April 2019
The Operating System Abstraction Layer (OSAL)
3.1 Overview
The Bluetooth Low Energy protocol stack, profiles, and applications are built around the OSAL. The OSAL
is a control loop that lets software set up how events should execute. Each layer of software functions as
a task and requires a task identifier (ID), a task initialization routine, and an event processing routine. You
can also define a message processing routine. These layers must adhere to a priority scheme with the LL
as the highest priority because of its timing requirements. The following is the hierarchy from the
SimpleBLEPeripheral project:
The OSAL also provides services such as message passing, heap management, and timers. OSAL code
is provided in source form. For more information on the OSAL functions, see the OSAL API Guide.
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