Real-time operating systems for C166 devices

V1.0, Summer 2022

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Real-time operating systems for C166 devices

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https://developer.arm.com/documentation/107724/latest

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Contents

Introduction................................................................................................................................................................1

RTX166 Tiny ................................................................................................................................................................1

Features ..................................................................................................................................................................1

ARTX-166 ....................................................................................................................................................................2

Features ..................................................................................................................................................................2

Kernel ..................................................................................................................................................................2

Flash File System .................................................................................................................................................2

TCP/IP Networking ..............................................................................................................................................2

Documentation...........................................................................................................................................................2

C166 RTOS Comparison Table ....................................................................................................................................3

Introduction

Keil PK166 Professional Developer’s Kit supports the C166 architecture with two real-time operating systems:

• RTX166 Tiny is included in the package, and it is designed for single-chip applications where code size is

the most important factor.

• ARTX-166 is available as a separate purchase and offers multitasking and adds a flash file system and

TCP/IP networking support.

RTX166 Tiny

RTX166 Tiny is a small real-time kernel designed for single-chip applications where code size is the most

important factor. The kernel requires only 1,500 bytes of code space and is well-suited for applications that

don't need RTOS features like messaging, semaphores, and memory pool management.

• It supports all memory models of the Keil C166 Compiler. Operating system variables and task stacks are

stored in internal memory.

• It performs round-robin and cooperative multitasking only. Preemptive task switching and task priorities

are not supported. If you need these features, you should consider ARTX-166.

• It uses one timer (0-6) for the operating system timer tick and requires 1,500 bytes of code space and 4

bytes of data space for each task. No other hardware resources are used.

• RTX166 Tiny is royalty-free.

Features

For a comprehensive list of features refer to the C166 RTOS Comparison Table. Here are the highlights:

• RTX166 Tiny tasks are integrated into the C166 C Compiler language. The following example shows how

tasks are declared:

void display_task (void) _task_ 1

{

}