KR20000001946A - Pattern generator using a computer - Google Patents

Abstract

PURPOSE: A computer-aided pattern generator is provided to, upon developing a software for a microcontroller, eliminate the inconvenience of repeatedly erasing/writing updated software from/to the microcontroller. CONSTITUTION: The pattern generator includes a computer(100) for producing various patterns of waveform signals, a first connector(210) coupled to an output port(110) of the computer, a second connector(230) coupled to a plurality of prove pins, and a buffer circuit(220) coupled between the first and second connectors. In the pattern generator, a software is executed in the computer(100) instead of a microcontroller. The output port(110) of the computer is used like an input/output port of the microcontroller.

Description

PATTERN GENERATOR USING COMPUTER

TECHNICAL FIELD The present invention relates to a computer system, and more particularly, to a computer system that generates an arbitrary pattern on a parallel port of a computer.

A microprocessor is an integrated circuit that has the capability of arithmetic logic operations and control for processing data, usually consisting of one VLSI chip. Microprocessors are often used as CPUs in computers, especially microcomputers, but they can also be used as processing devices such as terminals, printers or disk units, copiers or facsimiles, household appliances such as washing machines or refrigerators, video game machines, and automated machines in factories. It is used a lot. The microprocessor is designed to perform certain operations in accordance with software stored in memory at the manufacturing stage.

In the system development stage, software stored in the microprocessor's memory is subject to frequent modification. Therefore, there is an inconvenience of repeating the process of deleting and rewriting the data stored in the memory when modifying the software.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide an apparatus that functions as an input / output port of a microcontroller by executing software on a computer.

1 shows an adapter structure of a pattern generator according to a preferred embodiment of the present invention;

FIG. 2 is a detailed circuit diagram of the buffer circuit shown in FIG. 1; FIG. And

3 is a waveform diagram illustrating an example of an output waveform of a pattern generator according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: computer 110: printer port

200: adapter 210: connector

220: buffer circuit 300: probe

According to a feature of the present invention for achieving the object of the present invention as described above, the waveform generator comprises: a host for outputting signals having various types of waveforms; A connector connected to an output port provided in the host; A plurality of buffers for buffering input / output signals of the connector; It includes a plurality of input and output terminals connected to one end of the buffer.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

The data transmission method of the microprocessor includes a serial data transmission method and a parallel data transmission method. The serial transmission method is a bit slow, but can transmit data using a small number of wires, and the parallel data transmission method requires a large number of wires, but a large amount of data can be transmitted in a short time. The transmission speed is fast.

1 is a view showing an adapter structure of a pattern generator according to a preferred embodiment of the present invention.

Referring to FIG. 1, an adapter 200 includes a connector 210 for connecting to a printer port 110 of a computer 100, a buffer circuit 220, and probes 300_1, 300_1, And an output terminal 230 connected to 300_3 and 300_n. The software stored in the computer is programmed to output a high or low signal on each pin of the computer's parallel port (printer port). The program will be described later in detail.

Referring back to FIG. 1, the buffer circuit 210 serves as a bus that transmits a signal input through the connector 210 to the probes 300_1, 300_1, 300_3, and 300_n and a computer that receives a signal input from the probes. It serves as a bus for transmitting to.

FIG. 2 is a detailed circuit diagram of the buffer circuit shown in FIG. 1.

Referring to FIG. 2, the buffer circuit 220 includes buffers BF1 and BF2 and a resistor R1. The data pin a is connected to the input terminal of the buffer BF1, and the data pin b is connected to the input terminal of the buffer BF2. The output terminal of the buffer BF1 and the input terminal of the buffer BF2 are connected to each other and connected to the probe. In addition, a resistor R1 is connected to the connection point, and a power supply Vcc is connected to the other end of the resistor R1. The buffer BF1 is a buffer for transmitting a signal input from the computer to the probe, and the buffer BF2 is a buffer for transmitting a signal input from the probe to the computer.

3 is a waveform diagram illustrating an example of an output waveform of a pattern generator according to a preferred embodiment of the present invention.

A program for outputting the waveform diagram of FIG. 3 is as follows.

#define Data_Port1 0x378

#define Data_Port2 0x37A

#define LOGIC_HIGH 0x04

#define LOGIC_LOW 0x0C

void GenSIGNAL (void) {

outportb (Data_Port1, LOGIC_HIGH);

outportb (Data_Port2, LOGIC_HIGH);

delay (3 * T);

outportb (Data_Port1, LOGIC_LOW);

delay (2 * T);

outportb (Data_Port2, LOGIC_LOW);

delay (4 * T);

outportb (Data_Port1, LOGIC_HIGH);

outportb (Data_Port2, LOGIC_HIGH);

delay (3 * T);

}

In the program, the outportb subroutine is programmed to output a high (LOGIC_HIGH) or a low (LOGIC_LOW) signal to data pin 1 (Data_Port1) or data pin 2 (Data_Port2) of the print port. Although not shown in the above program, a subroutine called inportb can be programmed to input a probe signal to a computer. That is, the signal appearing on the probe can be monitored.

According to the present invention as described above, it is possible to perform the same function as the input / output port of the microcontroller by executing software on a computer.

Claims (1)

A host for outputting signals having various types of waveforms; A connector connected to an output port provided in the host; A plurality of buffers for buffering input / output signals of the connector; And a plurality of input / output terminals connected to one end of the buffers.