CN101648462B

CN101648462B - Control circuit of stylus printer based on FPGA module

Info

Publication number: CN101648462B
Application number: CN200910306375XA
Authority: CN
Inventors: 张帆; 张志星; 陈宙; 邹亮; 孙西杰
Original assignee: Hunan Greatwall Information Financial Equipment Co Ltd; Greatwall Information Industry Co Ltd
Current assignee: Great Wall Information Co Ltd
Priority date: 2009-08-31
Filing date: 2009-08-31
Publication date: 2011-12-21
Anticipated expiration: 2029-08-31
Also published as: CN101648462A

Abstract

The invention discloses a control circuit of a stylus printer based on a FPGA module, comprising a data bus, a decrypting module, an assistant motor module, a pulse width modulation control module, an interrupting module, a synchronous serial port module, a panel control module, a carriage unit motor module, a paper feeding motor module, a printing head module, a power source control module and a CPU. One end of the assistant motor module, the pulse width modulation control module, the interrupting module, the panel control module, the carriage unit motor module, the paper feeding motor module and the printing head module is respectively connected with the decrypting module, the other end is respectively connected with the data bus, the CPU is respectively connected with the decrypting module and the data bus, the power source control module is connected with the decrypting module, the synchronous serial port module is respectively connected with the printing head module and the CPU. Excepting the CPU, other modules are integrated in the FPGA module, and the invention has simple structure and low cost, thereby improving the efficiency and the reliability.

Description

Control circuit of stylus printer based on the FPGA module

Technical field

The present invention relates to a kind of control circuit of stylus printer based on the FPGA module.

Background technology

Impact printer is used product very widely as one in finance and field of securities, has more and more obtained the attention in market.But because the impact printer industry of China is started late, present most of impact printer factory assembles by the parts of the external impact printer of direct buying, these control circuit of stylus printer complex structures, cost height are unfavorable for promoting the use of.

Summary of the invention

In order to solve the above-mentioned technical problem that existing control circuit of stylus printer exists, the invention provides a kind of simple in structure, possibility is high, cost is low control circuit of stylus printer based on the FPGA module.

The technical scheme that the present invention solves the problems of the technologies described above is: comprise data/address bus, decoding module, the stand-by motor module, the pulse width modulation controlled module, interrupt module, the synchronous serial interface module, the panel control module, word vehicle motor module, the paper feed motor module, printhead module, energy supply control module, CPU, described data/address bus, decoding module, the stand-by motor module, the pulse width modulation controlled module, interrupt module, the synchronous serial interface module, the panel control module, word vehicle motor module, the paper feed motor module, printhead module, energy supply control module is integrated in the FPGA module EP2C5Q208C8 chip, described stand-by motor module, the pulse width modulation controlled module, interrupt module, the panel control module, word vehicle motor module, one termination decoding module of paper feed motor module and printhead module, another termination data/address bus, CPU respectively with decoding module, data/address bus links to each other, energy supply control module links to each other with decoding module, the synchronous serial interface module respectively with printhead module, CPU links to each other.

Technique effect of the present invention is: the present invention is except CPU, and other module all is integrated in the FPGA module, and it is relatively simple for structure like this, saved cost, and has improved efficient and reliability.

The present invention is further illustrated below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the structural representation of paper feed motor module of the present invention.

Fig. 3 is the structural representation of modular printhead module among the present invention.

The specific embodiment

Referring to Fig. 1, the present invention includes data/address bus, decoding module, stand-by motor module, pulse width modulation controlled module, interrupt module, synchronous serial interface module, panel control module, word vehicle motor module, paper feed motor module, printhead module, energy supply control module, CPU, except CPU, other module all is integrated in the FPGA module, and it adopts the EP2C5Q208C8 chip of Cyclone II series.Wherein the major function of decoding module is to provide necessary enable signal (enable signal) for other each functional modules, the external input signal of this module is mainly the address wire of CPU, and address wire is converted to the enable signal of other functional modules of control through various decoding circuits then.These enable signals can be divided into two classes substantially, and a class is for reading effective enable signal, and FPGA's read control end when effective when CPU makes, these enable signals are effective, these enable signals generally use in interrupt module, by enabling these signals, send the information of interrupting to CPU.Another kind of signal then is with imitating enable signal, writes control end when effective when what CPU made FPGA, and these enable signals are effective.Data/address bus, what the transfer of data of FPGA and CPU relied on is data/address bus, this module only is to make an input at the characteristic of bus, output (high resistant) module.By the selection of read-write, thus the direction of selection data flow.The major function of interrupt module is the interrupt signal that focuses on other each functional modules.Each functional module sends interrupt signal separately to interrupt module.Interrupt module is combined into two interrupt sources with these interrupt signals and passes to CPU.CPU can understand the ruuning situation of each functional module by the variation of these two interrupt sources.The main port of this module mainly is divided into the input port of CPU, data input/output port, the interrupt request singal port of enable port and inner each functional module.Interrupt signal mainly comprises the paper feed motor module, word vehicle motor module, the interruption of energy supply control module and printhead module.The major function of paper feed motor module is the motion of control paper feed motor, and whole module is made up of following four little modules, and they are respectively state machine module, copped wave module, pulse width modulation module, reach memory module, as shown in Figure 2.The paper feed motor module obtains the associated motor parameter that CPU sends from data/address bus, and be stored in the memory module, state machine module then according to this moment printer state the parameter in the memory module is selectively passed to copped wave module and pulsewidth adjusting module, rotate according to the instruction of CPU thereby drive peripheral circuit for controlling motor.Wherein state machine module has comprised 4 states and has resetted respectively, and no paper is read phase place, the reading speed state.According to these four different states, whether copped wave module and the selection of pulsewidth adjusting module are read the data in the memory module and are read the data of which section in the memory module.The output of copped wave module is the phase signal that the control motor rotates, and this phase signal of generation is to calculate according to the valid data that read from memory module.The input of copped wave module has then reflected size of current in the motor coil.Pulse width modulation module control reference current signal (this signal is compared with the input of copped wave module and judged whether the electric current in the motor coil has surpassed rated value).If the electric current in the motor coil has surpassed rated value, the copped wave module will be adjusted its output, makes that the current value in the motor coil is lower than load current value.The peripheral components of panel control module control is the operation interface (control panel) of the man-machine interaction of printer, and the operator comes printer operation by the button on the control panel, and can be according to the LED lamp bright, go out or dodge the state of judging that printer is present.So the importation of this circuit is a button, output then is the bright of LED lamp, goes out and glimmers.We can judge whether each functional module is normal among the FPGA by the state of the LED lamp on the control panel, are in which kind of pattern or state.This module major function is that the control signal position to the LED lamp in the program is passed to this module, and the key information that receives of this module and switch cover information send CPU to and transfers to routine processes then.What its major function of printhead module was the control printhead according to program setting goes out pin order printable character or Chinese character.Referring to Fig. 3, printhead module is made up of matrix of printed dots generation module and register and cache memory module.The operational process of whole printhead module is as follows: CPU is by the time constant of data/address bus with printer, and information such as mode parameter pass in the register in the printhead module.CPU will need the lattice information of the character printed or Chinese character to pass in the cache memory module in the printhead module by dma mode.CPU passes to related register in the printhead module by the synchronous serial interface module with the configuration information of printhead.These data information transfer that printhead module will receive are before given inner matrix of printed dots generation module.

When these information all are stored in the printhead module, and printhead has been when having moved to the position that needs to print, and the data message that the matrix of printed dots generation module just transmits according to CPU is controlled peripheral print needle drive circuit and begun printing.Word vehicle motor module functions is the motion of control word vehicle motor, and the function of whole module is almost completely the same with the paper feed motor module with implementation.The function of pulse width modulation controlled module is that the 80V power supply that is used to print is controlled and produced to the light emitting diode on printer photosensor and the photosensitive tube.The control of light emitting diode, by pulse width modulation module make the gray scale of light emitting diode have 256 kinds optional, accurately select only electric current gear to reach only luminance difference.Thereby judging more accurately has paper still not have paper and test paper border and black mark etc.The function of energy supply control module mainly is that the power supply of the power supply of 5V and 38V is monitored, and when 38V power supply or 5V voltage instability advance, can send an interrupt signal and turn-off the enable signal of each functional module.The stand-by motor module functions sends the control motor signal of CPU to motor, and this can be used as the control signal of servomotor chip.The function of synchronous serial interface module is by determining whether transmitting type information in the printing function module to some signal judgment in the print head functions module.

Claims

1. control circuit of stylus printer based on the FPGA module, it is characterized in that: comprise data/address bus, decoding module, the stand-by motor module, the pulse width modulation controlled module, interrupt module, the synchronous serial interface module, the panel control module, word vehicle motor module, the paper feed motor module, printhead module, energy supply control module, CPU, described data/address bus, decoding module, the stand-by motor module, the pulse width modulation controlled module, interrupt module, the synchronous serial interface module, the panel control module, word vehicle motor module, the paper feed motor module, printhead module, energy supply control module is integrated in the FPGA module EP2C5Q208C8 chip, the stand-by motor module, the pulse width modulation controlled module, interrupt module, the panel control module, word vehicle motor module, one termination decoding module of paper feed motor module and printhead module, another termination data/address bus, CPU respectively with decoding module, data/address bus links to each other, energy supply control module links to each other with decoding module, the synchronous serial interface module respectively with printhead module, CPU links to each other.

2. the control circuit of stylus printer based on the FPGA module according to claim 1, it is characterized in that: described paper feed motor module is made up of copped wave module, memory module, pulse width modulation module, state machine module, state machine module links to each other with memory module, and memory module links to each other with copped wave module, pulse width modulation module respectively.