ULINKPRO Keil, ULINKPRO Datasheet - Page 41

• Manufacturer Part Number: ULINKPRO
• Description: KIT DEBUG/TRACE UNIT HIGH SPEED
• Manufacturer: Keil
• Type: In-Circuit, Real-Time Debugger/Programmerr

Specifications of ULINKPRO

• Contents: Module
• For Use With/related Products: ARM7, ARM9, Cortex
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Chapter 4. RTX RTOS Kernel
This chapter discusses the benefits of using a Real-Time Operating System
(RTOS) and introduces the features available in Keil RTX Kernels. Note that the
Keil development tools are compatible with many third-party RTOS solutions.
You are not bound to use Keil RTX; however, the RTX Kernels are well
integrated into the development tools and are feature-rich, and well tailored
towards the requirements of deeply embedded systems.
Software Concepts
There are two basic design concepts for embedded applications:
Endless Loop Design
Running an embedded program in an endless loop is an adequate solution for
simple embedded applications. Time-critical functions, typically triggered by
hardware interrupts, are executed in an ISR that also performs any required data
processing. The main loop contains only basic operations that are not time-
critical, but which are executed in the background.
This software concept requires only one stack area and is very well suited for
devices with limited memory. Architectures that provide several interrupt levels
allow complex low-level ISR functions. Time-critical jobs may execute in higher
interrupt levels.
Endless Loop Design: this design involves running the program as an
endless loop. Program functions (tasks) are called from within the loop,
while interrupt service routines (ISRs) perform time-critical jobs including
some data processing.
RTOS Design: this design involves running several tasks with a Real-Time
Operating System (RTOS). The RTOS provides inter-task communication
and time management functions. A preemptive RTOS reduces the
complexity of interrupt functions, since time-critical data processing is
performed in high-priority tasks.
Chapter 4. RTX RTOS Kernel