DELPHI for Electronic Engineers

In the first instalment of this series, we introduced the Delphi programming environment and described several examples that illustrate how to program in Delphi. In this instalment, we take a more detailed look at the design of a somewhat more serious program. Our project here is to construct a simple pocket calculator in software. In next month’s instalment, it will be expanded to include a keypad that can be connected to a serial port to allow the keystrokes to be read by the Delphi program.
This project consists of three components:
- The presentation layer, which shows the results on the monitor.
- The driver layer, which provides the interface with the hardware (the keypad). This layer will be described in the next instalment.
- The processing layer, which is the software that simulates the operation of a pocket calculator.