AcQuisition Technology Quad M-module Carrier i4000 Manual de usuario descargar pdf (Pagina 11)

APIS - AcQ Platform Interface Software

Programmer’s Manual Version: 2.1

AcQuisition Technology bv

P.O. Box 627, 5340 AP

Oss, The Netherlands

Page 9 of 77

Figure 1 APIS Overview

3. FUNCTIONAL DESCRIPTION

This chapter contains a detailed description of the product.

3.1. APIS CONCEPT

Hardware accesses to registers and memory are handled by APIS. Some minor operating system

dependent functions frequently used in hardware related software, such as interrupt handling and

delay functions are also provided by APIS.

APIS platform support consists of an Application Programming Interface in the form of definition files

coded in ANSI-C and platform dependent modules e.g. source files, libraries and/or drivers.

In the most simple outline, a platform dependent APIS module consist of nothing more then macro

definitions in which APIS calls are substituted by direct hardware accesses. But in most cases an

APIS module will consist of a library with interface routines and in some implementations a device

driver is needed for interaction with the operating system.

3.2. BLOCK DIAGRAM

The following block diagram illustrates a simplified APIS based application.

The block diagram above shows the APIS concept divided in layers. The top layer is the application

program. The application program interfaces to the APIS Application Programming Interface (API).

The API can call functions of the APIS Platform Support Modules, it can interact with the Operating

System and it can directly access the hardware. The APIS Platform Support Module(s) provides

functions to the API for accessing the hardware and use of Operating System functions. The bottom

layer in the diagram is defined as the APIS platform which is a combination of the hardware and the

Operating System.

In the diagram there is no interface between the Application and the Operating System; However the

application program can use Operating System functions but in distribution software for AcQ products

this has to be avoided.

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AcQuisition Technology Quad M-module Carrier i4000 Manual de usuario Pagina 11