Gtco Summagrid IV - Users Guide Part 2 Manuel d'utilisateur télécharger pdf (Page 23)

Summagrid IV 23

Chapter 3 Guidelines for Writing a Software Driver

If the Summagrid IV is connected to a computer, rather than to a terminal, the computer

must have a driver for the tablet. The driver is a software subroutine that collects and

decodes Summagrid IV reports for use by another (master) program. This chapter provides

some guidelines, in the form of flowcharts, for writing a driver.

The flowcharts are for a Summagrid IV using the Summagraphics UIOF packed binary

report format. The steps are general for any set of operating characteristics.

NOTE: In the context of these charts, normalize means to combine the coordinate bytes

into the format required by the user’s master program.

3.1

3.1.1

3.1.2

3.1.3

3.1.4

3.1.5

Flowcharts for Writing Drivers

General Flowchart for Master Program to Read and Process Digitizer

Reports

Detail A: Get Binary Format Report

Detail B: Get Binary Format Report, Poll/Remote Mode or Stream Mode

Detail C: Get Byte from Tablet

Detail D: Normalize Bytes into X and Y Coordinates, Switch and

Proximity Information

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Gtco Summagrid IV - Users Guide Part 2 Manuel d'utilisateur Page 23