Sharp DV-MX1U User's Guide download pdf (Page 97)

API Calls 85

E-EQ-MX1RG-D MX1 Reference Guide

API Calls

See Also: LXE DOS API Programming Guide E-SW-DOSAPIPG-A

The LXE DOS Computer Application Programmer’s Interface (API) is designed to enable

application programmers to access the functionality of the computer hardware without requiring

them to understand the details of the hardware design.

The LXE MX1 Hand-Held Computer is architecturally an AT Clone with power management

features required for mobile use. Like all AT computers, it uses a BIOS software layer to provide

a hardware programming interface to both DOS and the Application Programs. It is functionally a

486 mobile AT customized for data collection applications. Both BIOS and DOS are available for

programming ease, but applications must be customized to make use of the enhanced features as

well as to operate with the reduced function LCD and keypad. The MX1 is not designed to be a

general-purpose computer.

API services are accessed through software interrupts 10h and 15h. The 486 API is the

application-level and driver-level software interface for all of the unique MX1 hardware.

A simple register-based procedure parameter passing architecture has been implemented with a

similar structure used by IBM BIOS. All procedural calls to the 486 API microcode is to be done

via a software interrupt.

Sample Code for API Calls

The following is a brief code segment that enables the scanner on the combination Scanner/RS-

232 endcap, demonstrating the proper use of API calls:

#include <stdio.h>

#include <dos.h>

#define PROT_INT 0x15

#define PROT_EXT 0xba

#define SCAN_CONTROL 0x56

#define COM1_MODE 0x41

#define SCANNER 0x00

#define RS_232 0x01

union REGS inRegs, retRegs

main(){

inRegs.h.ah=PROT_EXT;

inRegs.h.al=SCAN_CONTROL;

inRegs.h.bh=COM1_MODE;

inRegs.h.bl=SCANNER;

int86(PROT_INT, &inRegs, &retRegs);

}

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 215 216

No comments

Sharp DV-MX1U User's Guide Page 97