CN112904751A - Heating logic control method of thermal printing head - Google Patents
Heating logic control method of thermal printing head Download PDFInfo
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- CN112904751A CN112904751A CN201911225653.9A CN201911225653A CN112904751A CN 112904751 A CN112904751 A CN 112904751A CN 201911225653 A CN201911225653 A CN 201911225653A CN 112904751 A CN112904751 A CN 112904751A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007651 thermal printing Methods 0.000 title claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 120
- 230000006870 function Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000007639 printing Methods 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
Abstract
The invention provides a heating logic control method of a thermal printing head, which comprises the following steps: and S1, controlling the heating time: replacing the original general input and output pin by the data output pin of the serial peripheral interface, wherein the pin control is changed from the original processor control to the on-chip peripheral control of the serial peripheral interface; s2, performing a heating flow for processing the thermal printer head by the chip and the peripheral: the wiring method comprises the following steps that a data pin and a data clock pin in a thermal print head heating module are respectively controlled by a data output pin and a data clock output pin of a serial peripheral interface 0, a data latch pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 1, and a heating enable pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 2; s3, control flow: and automatically loading data to the serial peripheral interface by using the direct memory access function of the on-chip peripheral, and finally judging that the heating process is finished.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a heating logic control method of a thermal printing head.
Background
With the development of society, people put higher and higher demands on the diversity and richness of the functions of electronic products. With advances in integrated circuit design and manufacturing technology, the realization of this need becomes possible. Printers as electronic products are also widely used, wherein thermal printers are commonly used printers in existing printers, and are characterized by high printing speed, simple structure, no need of adding ink, and principle of displaying images by heating printing paper. The receipt printer is widely applied to printing receipts in catering and supermarkets. The thermal printer head is a core element of a thermal printer printing paper.
As shown in fig. 1, a thermal print head generally has two core modules, a heating module and a stepping motor module. The stepping motor module is used for controlling the stepping motor to enable the thermal paper to be fed.
The heating module is used for controlling the heating strips to heat the thermal paper, and the thermal paper can display colors when being heated. The heating module may include a heat generating component, a temperature sensor, and a photosensor. The stepping motor and the heating module need to work cooperatively, and the heating module heats one line of data when the motor runs for one line.
As shown in FIG. 2, the heat module typically has four interface pins, namely a data pin, a data clock pin, a data latch pin, and a heat enable pin. The working process comprises the steps that one bit of data is sent at the rising edge of one clock, the data latch pin is pulled down after one line of data is sent, the sent data are latched in the heating logic, and then the heating pin is pulled up to heat the thermal paper.
Because the time sequence of the data pin and the data clock pin is the same as the time sequence of the serial peripheral interface, the serial peripheral interface of the singlechip is usually used for connecting the data pin and the data clock pin, and the universal input and output pin is used for controlling the data latch pin and the heating enable pin.
The heating enable pin has a high requirement on heating time, and the existing technical solutions use a general-purpose input/output pin for control, which results in a requirement on the real-time performance of the processor.
There are two general approaches to real-time requirements, the first one is blocking, which blocks the processor waiting for the heating time to achieve accurate timing heating.
In the second method, a hardware timer is used, and an interrupt mode is generated regularly to realize accurate timing heating.
The first method uses too much processor resources and fails to respond to other events in a warm-up process, and is therefore not typically used in real product code.
In the second method, a hardware timer function is used, hardware interruption is generated at regular time, and level inversion is realized in an interruption function to realize heating time control. Under the condition of driving of the single chip microcomputer, the single chip microcomputer is more considered in real-time problem during chip design, so that the preemptive interrupt is supported under the general condition, the priority of a control timer for heating pins can be set to be the highest to ensure the precision, and meanwhile, attention needs to be paid to the fact that the interrupt cannot be closed by other threads. In the case of application processor driving, because the application processor considers more main frequency performance of the processor and has no high requirement on real-time performance, the application processor usually has no preemptive interrupt, and there is no way to ensure that the interrupt function responds at the first time. The application processor drives the thermal printer to use the scheme that a singlechip specially controlling the thermal head is usually added, data is sent to the singlechip, and the singlechip controls the thermal head. This solution would add the cost of an additional single chip.
The above technical solutions have a drawback that the processor is required to participate in the heating process of the thermal printer head, which results in excessive resource consumption of the processor, or special requirements for the processor, such as the need to preempt the interrupt and the inability to turn off the interrupt.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for controlling heating logic of a thermal print head, which does not require a processor to participate in a heating process of a thermal printer, and enables the application processor to directly drive a heating module of the thermal printer in a non-real-time system.
Specifically, the invention provides a heating logic control method of a thermal printing head, which comprises the following steps:
and S1, controlling the heating time: replacing the original general input and output pin by the data output pin of the serial peripheral interface, wherein the pin control is changed from the original processor control to the on-chip peripheral control of the serial peripheral interface;
s2, performing a heating flow for processing the thermal printer head by the chip and the peripheral: the wiring method comprises the following steps that a data pin and a data clock pin in a thermal print head heating module are respectively controlled by a data output pin and a data clock output pin of a serial peripheral interface 0, a data latch pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 1, and a heating enable pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 2;
s3, control flow: and automatically loading data to the serial peripheral interface by using the direct memory access function of the on-chip peripheral, and finally judging that the heating process is finished.
The step S3 is a control flow, further including:
s3.1: preparing printing data needing to use a serial peripheral interface in a memory of the on-chip peripheral;
s3.2: preparing serial peripheral interface data latched by data in an on-chip and peripheral memory, wherein the serial peripheral interface data is represented by binary number of x bits, the front numerical value is displayed as n bits of 1, the 111 of the front numerical value is determined by the time of sending heating data, the middle numerical value is displayed as m bits of 0, the 000 of the middle numerical value is determined by the time of latching the data of the thermal printing head, the rear numerical value is displayed as 1, and the level of a data latching pin is pulled up by the 1 of the rear numerical value;
s3.3: preparing heating enabling serial peripheral interface data in an on-chip peripheral memory, wherein in binary representation, front numerical values are displayed as n bits of 0, 000 of the front numerical values are determined by heating data sending time and data latching time, middle numerical values are displayed as m bits of 1, 111 of the middle numerical values are determined by heating time of a thermal printing head, the rear numerical values are displayed as 0, and the rear numerical values of 0 enable the level of a heating enabling pin to be pulled down;
s3.4: sequentially enabling the direct memory access functions of the serial peripheral interface 0, the serial peripheral interface 1 and the serial peripheral interface 2, and enabling the direct memory access peripherals to automatically carry and transfer data to the serial peripheral interface to realize analog time sequence;
s3.5: the direct memory access peripheral of the serial peripheral interface 2 completes the interruption and judges that the heating process is completed.
The binary is represented by 19 bits.
In the step S3.2: n is 15 and m is 3.
In step S3.3: n is 15 and m is 3.
The serial peripheral interface is a serial peripheral interface of an externally-hung singlechip.
The application has the advantages that: the thermal head does not need the participation of the CPU in the heating process, reduces the occupation of the CPU resource and does not consume the processor resource too much. The direct control to the heating head can be realized by the processor at the application level, the control by an externally-hung single chip is not needed, the hardware cost is reduced, and the practical value is very high.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic block diagram of a prior art thermal printer to which the present invention relates.
FIG. 2 is a schematic block diagram of the operation of the prior art single chip and heating module according to the present invention.
FIG. 3 is a schematic block diagram of a method of replacing a universal input output pin with a data output pin of a serial peripheral interface.
FIG. 4 is a schematic block diagram of the method of the present invention in which the data latch pin and the heat enable pin are controlled by the data output pin of the serial peripheral interface.
FIG. 5 is a waveform diagram of the control clock, data latch, heat enable display of the serial peripheral interface according to the method of the present invention.
Fig. 6 is a flow chart of a method to which the present invention relates.
Detailed Description
The problem of no processor involvement in the heating time is solved, and firstly, the control of the heating time is only a high level with variable length in a digital circuit. The idea to solve the problem is to use the on-chip peripherals to simulate the required levels and the heating process does not require the processor to participate.
Firstly, the interfaces of the on-chip and the peripheral are analyzed, and the heating time of the heating head of the printer is controlled by using a data output pin of the serial peripheral interface. Because the data format of the serial peripheral interface is simple, the time sequence is also simple and convenient to simulate the required level time sequence. The communication frequency of the serial peripheral interface determines the minimum unit of heating time, and the heating time is determined by the output high-level data volume of the serial peripheral interface. And the time sequence is required to be completed under the condition that the processor does not participate, so that the direct memory access function of the on-chip peripheral equipment is also required to be used for automatically loading data to the serial peripheral equipment interface. The above enables control of the heating time and there is no need for real-time response of the processor.
As shown in fig. 3, the general purpose input output pin is replaced by the data output pin of the serial peripheral interface, and the pin control is modified from processor control to on-chip peripheral control of the serial peripheral interface.
In the second step, as shown in fig. 4 and 5, the heating processes of the thermal printer head are expanded to be processed by the chip and the peripheral. The wiring method comprises the following steps:
the clock and data pins are controlled by the clock output pin and the data output pin of the serial peripheral interface 0, the data latch pin is controlled by the data output pin of the serial peripheral interface 1, and the heating enable pin is controlled by the data output pin of the serial peripheral interface 2.
The control flow specifically comprises the following steps:
1: preparing print data requiring serial peripheral interface in memory
2: the serial peripheral interface data is ready for data latching in memory,
binary data example 1111111111111110001
The front 111 is determined by the time of heating data transmission
The middle 000 is determined by the time of data latch of the thermal print head
The latter 1 pulls the data latch pin level high
3: serial peripheral interface data ready for heat enable in memory
Binary data example 0000000000000001110
The former 000 is determined by heating data transmission time and data latch time
The middle 111 is determined by the thermal print head heating time
Back 0 let heat enable pin level pull low
4: the direct memory access functions of the serial peripheral interfaces 0,1 and 2 are sequentially enabled, and the direct memory access peripheral automatically moves to the data channel serial peripheral interface to realize analog time sequence.
5: the direct memory access peripheral of the serial peripheral interface 2 completes the interruption and judges that the heating process is completed.
As shown in fig. 6, the present invention provides a heating logic control method for a thermal print head, comprising the steps of:
and S1, controlling the heating time: replacing the original general input and output pin by the data output pin of the serial peripheral interface, wherein the pin control is changed from the original processor control to the on-chip peripheral control of the serial peripheral interface;
s2, performing a heating flow for processing the thermal printer head by the chip and the peripheral: the wiring method comprises the following steps that a data pin and a data clock pin in a thermal print head heating module are respectively controlled by a data output pin and a data clock output pin of a serial peripheral interface 0, a data latch pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 1, and a heating enable pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 2;
s3, control flow: and automatically loading data to the serial peripheral interface by using the direct memory access function of the on-chip peripheral, and finally judging that the heating process is finished.
The step S3 is a control flow, further including:
s3.1: preparing printing data needing to use a serial peripheral interface in a memory of the on-chip peripheral;
s3.2: preparing serial peripheral interface data latched by data in an on-chip and peripheral memory, wherein the serial peripheral interface data is represented by binary number of x bits, the front numerical value is displayed as n bits of 1, the 111 of the front numerical value is determined by the time of sending heating data, the middle numerical value is displayed as m bits of 0, the 000 of the middle numerical value is determined by the time of latching the data of the thermal printing head, the rear numerical value is displayed as 1, and the level of a data latching pin is pulled up by the 1 of the rear numerical value;
s3.3: preparing heating enabling serial peripheral interface data in an on-chip peripheral memory, wherein in binary representation, front numerical values are displayed as n bits of 0, 000 of the front numerical values are determined by heating data sending time and data latching time, middle numerical values are displayed as m bits of 1, 111 of the middle numerical values are determined by heating time of a thermal printing head, the rear numerical values are displayed as 0, and the rear numerical values of 0 enable the level of a heating enabling pin to be pulled down;
s3.4: sequentially enabling the direct memory access functions of the serial peripheral interface 0, the serial peripheral interface 1 and the serial peripheral interface 2, and enabling the direct memory access peripherals to automatically carry and transfer data to the serial peripheral interface to realize analog time sequence;
s3.5: the direct memory access peripheral of the serial peripheral interface 2 completes the interruption and judges that the heating process is completed.
The binary is represented by 19 bits.
In the step S3.2: n is 15 and m is 3.
In step S3.3: n is 15 and m is 3.
The serial peripheral interface is a serial peripheral interface of an externally-hung singlechip.
The invention can realize the direct control of the heating head by the application level processor, and replace the on-chip and peripheral control of the plug-in single chip microcomputer.
The invention can realize the direct control of the heating head by the application level processor, and replace the on-chip and peripheral control of the plug-in single chip microcomputer.
The invention can also use other on-chip and peripheral functions, and can be realized as long as the corresponding time sequence can be simulated. However, compared with the peripheral equipment with the serial peripheral interface, the simplicity and the universality of the peripheral equipment are not convenient for the serial peripheral interface.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of controlling heating logic of a thermal print head, comprising the steps of:
and S1, controlling the heating time: replacing the original general input and output pin by the data output pin of the serial peripheral interface, wherein the pin control is changed from the original processor control to the on-chip peripheral control of the serial peripheral interface;
s2, performing a heating flow for processing the thermal printer head by the chip and the peripheral: the wiring method comprises the following steps that a data pin and a data clock pin in a thermal print head heating module are respectively controlled by a data output pin and a data clock output pin of a serial peripheral interface 0, a data latch pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 1, and a heating enable pin in the thermal print head heating module is controlled by a data output pin of a serial peripheral interface 2;
s3, control flow: and automatically loading data to the serial peripheral interface by using the direct memory access function of the on-chip peripheral, and finally judging that the heating process is finished.
2. The method as claimed in claim 1, wherein the step S3 further comprises:
s3.1: preparing printing data needing to use a serial peripheral interface in a memory of the on-chip peripheral;
s3.2: preparing serial peripheral interface data latched by data in an on-chip and peripheral memory, wherein the serial peripheral interface data is represented by binary number of x bits, the front numerical value is displayed as n bits of 1, the 111 of the front numerical value is determined by the time of sending heating data, the middle numerical value is displayed as m bits of 0, the 000 of the middle numerical value is determined by the time of latching the data of the thermal printing head, the rear numerical value is displayed as 1, and the level of a data latching pin is pulled up by the 1 of the rear numerical value;
s3.3: preparing heating enabling serial peripheral interface data in an on-chip peripheral memory, wherein in binary representation, front numerical values are displayed as n bits of 0, 000 of the front numerical values are determined by heating data sending time and data latching time, middle numerical values are displayed as m bits of 1, 111 of the middle numerical values are determined by heating time of a thermal printing head, the rear numerical values are displayed as 0, and the rear numerical values of 0 enable the level of a heating enabling pin to be pulled down;
s3.4: sequentially enabling the direct memory access functions of the serial peripheral interface 0, the serial peripheral interface 1 and the serial peripheral interface 2, and enabling the direct memory access peripherals to automatically carry and transfer data to the serial peripheral interface to realize analog time sequence;
s3.5: the direct memory access peripheral of the serial peripheral interface 2 completes the interruption and judges that the heating process is completed.
3. The method of claim 1, wherein the binary is represented by 19 bits.
4. A method of controlling heating logic of a thermal printhead according to claim 3, wherein in step S3.2: n is 15 and m is 3.
5. A method of controlling heating logic of a thermal printhead according to claim 3, wherein in step S3.3: n is 15 and m is 3.
6. The method as claimed in claim 1, wherein the serial peripheral interface is a serial peripheral interface of a plug-in single chip microcomputer.
7. The method as claimed in claim 1, wherein the application level processor is used to directly control the heating head to replace the on-chip and peripheral control of the plug-in single chip microcomputer.
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| CN114083905A (en) * | 2021-12-06 | 2022-02-25 | 湖南凯通电子有限公司 | Thermal circuit for thermal printing hair |
| CN115534545A (en) * | 2022-10-11 | 2022-12-30 | 珠海趣印科技有限公司 | Printing control method of thermal printer based on motor and thermal sensitive sheet |
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| CN112904751B (en) | 2024-01-30 |
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