CN107037757A - A kind of BootLoader programme upgrade methods based on photoelectricity transmission - Google Patents
A kind of BootLoader programme upgrade methods based on photoelectricity transmission Download PDFInfo
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- CN107037757A CN107037757A CN201710250088.6A CN201710250088A CN107037757A CN 107037757 A CN107037757 A CN 107037757A CN 201710250088 A CN201710250088 A CN 201710250088A CN 107037757 A CN107037757 A CN 107037757A
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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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- 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
- G05B2219/24—Pc safety
- G05B2219/24005—Inhibit update control program if default values has been changed by program during processing
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Abstract
The invention discloses a kind of BootLoader programme upgrade methods based on photoelectricity transmission.The present invention is that using BootLoader, this function is communicated main control MCU module by photoelectric transmission module with upper computer module, main control MCU program upgrading data packet in upper computer module is downloaded in main control MCU module with Xmodem Protocol, and main control MCU module needs synchronism switching baud rate to improve update rate with upper computer module, specifically：Upper computer module is sent to main control MCU module after order of shaking hands, and main control MCU module will return to an order of shaking hands to upper computer module；Upper computer module is had correctly received after the order of shaking hands of main control MCU module, and BOOT order can be transmitted into main control MCU module；Subsequent main control MCU module enters BOOT, and an order for confirming to enter BOOT is returned to upper computer module；Upper computer module starts Xmodem Protocol, starts to transmit main control MCU program upgrading data packet and writes with a brush dipped in Chinese ink the ROM of main control MCU module.Present invention, avoiding the triviality and safety issue of dismounting gas meter.
Description
Technical field
Photoelectricity transmission is combined by the present invention with BootLoader program functions, is related to a kind of to main control MCU application program
A kind of method of upgrading, and in particular to method for ultrasonic wave gas meter master control borad application program without disassembly procedure upgrade.
Background technology
Bootloader is the first paragraph code that embedded system is performed after the power-up, is transported before application program operation
Capable.In an operating system, it can with initiating hardware equipment, memory headroom mapping graph is set up, so that by the software and hardware of system
Environment takes a proper states to, to get out correct environment for final call operation system kernel.We here with
BootLoader functions carry out main control MCU come the Self_Programming_Library function libraries provided using Renesas
Application program in line writing.
Gas meter company will certainly will modify when researching and developing intelligent gauge to the main control MCU application program on table tool
Upgrading is debugged again, but main control MCU is typically all arranged on inside table tool, and dismounting table has this cumbersome process for research and development
It is very inconvenient.And the present invention just solves this problem, the present invention can pass through in the case where not dismantled to table tool
Photoelectricity transmission downloads to the ROMPaq of new edition in main control MCU by BootLoader functions, it is achieved thereby that to master control
The upgrading of MCU application programs.The present invention also can operate with upgrading and be mounted on intelligent gas meter main control MCU application journey in user family
Sequence, substantially increases the security in operative employee's human efficiency and operating process, more facilitates convenience-for-people.
The content of the invention
Dismounting table has when upgrading the invention aims to overcome to the application program of intelligent gas meter main control MCU
This complicated processes, improves operating efficiency, also improves security.
The present invention is during the application program updating of intelligent gas meter main control MCU, using BootLoader functions as core
The heart.The present invention supports a variety of main control MCUs of multiple product, as long as main control MCU has this function of BootLoader, then production
Product can be upgraded in the case of without dismounting by photoelectricity transmission to the application program of main control MCU.
A kind of BootLoader programme upgrade methods based on photoelectricity transmission, the present invention is that main control MCU module is utilized
This function of BootLoader is communicated by photoelectric transmission module with upper computer module, the main control MCU in upper computer module
Program upgrading data packet is downloaded in main control MCU module with Xmodem Protocol, and main control MCU module needs with upper computer module
Synchronism switching baud rate is to improve update rate, specifically：Upper computer module is sent to main control MCU module after order of shaking hands,
Main control MCU module will return to an order of shaking hands to upper computer module；Upper computer module has correctly received holding for main control MCU module
After hand order, BOOT order can be transmitted into main control MCU module；Subsequent main control MCU module enters BOOT, to host computer
Module returns to an order for confirming to enter BOOT；Upper computer module starts Xmodem agreements, starts to transmit main control MCU program
Upgrading data packet and the ROM for writing with a brush dipped in Chinese ink main control MCU module.
The technical solution adopted for the present invention to solve the technical problems is as follows：
Implementation process of the present invention includes three modules：Upper computer module, photoelectric transmission module and main control MCU module；And light
Electrical transmission module is integrated in main control MCU module, upper computer module by photoelectric transmission module by main control MCU program upgrade data
Bag is transferred to main control MCU module, and main control MCU module is upgraded.
Described upper computer module includes data format conversion unit, transmission unit, and upper computer module is supporting is provided with
The Integrated Light dateline of USB interface, so that data communication can be carried out between upper computer module and photoelectric transmission module；
Described main control MCU module is corresponding with upper computer module, and main control MCU module is received by photoelectric transmission module
After the order of shaking hands that transmission unit is sent in upper computer module, into BOOT wait states, then return to a handshake and give
Upper computer module；When receiving order of the upper computer module into BOOT, main control MCU module goes forward side by side BOOT flag bit set
Enter BOOT states, return again to one and confirm the order for coming into BOOT to upper computer module；Main control MCU module enters after BOOT
(main control MCU has been automatically converted to 9600bps baud rates), main control MCU module sends a string of initial datas into BOOT
" BOOTLOAD " gives upper computer module, and main control MCU program upgrading data packet is transferred to main control MCU by upper computer module after receiving
Module；The mode that main control MCU module is received using interrupting writes the main control MCU program upgrading data packet received in ROM, and
Complete program burn writing.
Described photoelectric transmission module is integrated in main control MCU module, and the Integrated Light dateline of upper computer module USB interface is first
The electric signal of main control MCU program upgrading data packet is first converted into optical signal, photoelectric transmission module, photoelectricity transmission is then transferred to
The optical signal of reception is converted into electric signal by module, is then transferred to main control MCU module；
The circuit description of described photoelectric transmission module:
Photoelectric transmission module is divided into two units of infrared emission and infrared receiver：
Infrared emission unit is by three resistance (resistance R1, resistance R2, resistance R3), a triode (Q1) and one
Infrared transmitting tube (D1) is constituted；Resistance R1 one end is connected with resistance R2 one end, and this terminates to main control MCU module
The transmission mouthful Tx of microcontroller serial port；Resistance R1 another termination infrared transmitting tube D1 positive pole, and this termination power is just
Pole；Infrared transmitting tube D1 negative pole connecting resistance R3 one end, resistance R3 another termination PNP triode Q1 emitter stage, PNP tri-
The pole pipe Q1 ground level connecting resistance R2 other end, PNP triode Q1 grounded collector；Described infrared emission cast is
D1AT205。
Infrared receiver by three resistance (resistance R4, resistance R5, resistance R6), two electric capacity (C1, C2), one three
Pole pipe (Q2) and a photosensitive receiving tube (D2) are constituted；Resistance R5 one end is connected to ground, at the same with electric capacity C1 one end and
NPN triode Q2 transmitting tube is connected；The resistance R5 other end is connected with the electric capacity C1 other end, at the same with NPN triode Q2
Base stage be connected with resistance R4 one end；The resistance R4 other end is connected with photosensitive receiving tube D2 positive pole；Photodiode
Negative pole is connected with positive source, while being connected with resistance R6 one end；The resistance R6 other end is connected with electric capacity C2 one end,
It is connected simultaneously with the serial ports receiving terminal Rx and NPN triode Q2 of the single-chip microcomputer of main control MCU module colelctor electrode；Electric capacity C2's is another
One end is connected to the ground.
Described Xmodem Protocol：
Xmodem Protocol is proposed and realized in 1970s by Ward Christensen earliest, transmits data unit
For packet, the form of packet is as follows：
| Byte1 | Byte2 | Byte3 | Byte4~Byte131 | Byte132 | | Start Of Header |
PacketNumber |~(PacketNumber) | Packet Data | Check Sum |
Start Of Header are defined as 0x01；PacketNumber is the numbering of packet；~(PacketNumber)
Negated for the numbering of packet；Check Sum are and verified, and verification computational methods are the tired of Packet Data (128 byte)
Plus and, a byte is accounted for due to verification and only, if cumulative and more than 255, the continuation that will start from scratch is cumulative, disregards carry.
Described data format conversion unit：
Download program file format is .hxf file formats, it is necessary to which being converted into binary code could be entered by photoelectricity burning
In single-chip microcomputer ROM, this upper computer module realizes that this is changed using I/O Stream, and specific data conversion format is as follows：
.hxf file reads rule：
Example ":ABCDEFGHIJKLMNOPQRXTUVWXYZabcdefghijklmnop " can be counted as " 0xAB 0xCD
0xEF 0xGH 0xIJ 0xKL 0xMN 0xOP 0xQR 0xST 0xUV 0xWX 0xYZ 0xab 0xcd 0xef 0xgh
0xij 0xkl 0xmn 0xop”
First character section 0xAB represents the length of one's own profession data；
Second and third byte 0xCD 0xEF represent the initial address of one's own profession data；
Nybble 0xGH represents data type, and data type has：0x00、0x01、0x02、0x03、 0x04、0x05.With
It is respectively each data type down：
'00'Data Rrecord：For record data, most of record of HEX files is all data record
'01'End of File Record:For identifying the end of file, the last of file is placed on, mark HEX files
Ending
'02'Extended Segment Address Record:For identifying the record of extension sector address
'03'Start Segment Address Record:Start sector address record
'04'Extended Linear Address Record:For identifying the record of extension linear address
'05'Start Linear Address Record:Start linear address record
After data type for data, last byte 0xop for verification and.If data address is discontinuous, use
0xFF is filled up.
The agreement interacted between described main control MCU module and upper computer module：
First have to determine the baud rate that main control MCU module is communicated with upper computer module.Enter in main control MCU module
Before BootLoader, only simple handshake between main control MCU module and upper computer module, so the baud of communication
Calibration is 2400bps.After main control MCU module enters BootLoader, start the biography of main control MCU program upgrading data packet
Defeated, then the baud rate of main control MCU module and upper computer module is promoted to 9600bps, to improve main control MCU program upgrading data packet
Transmit the speed write with a brush dipped in Chinese ink.
Main control MCU module is with the mechanism that upper computer module is shaken hands：
Upper computer module is sent after an order of shaking hands, into wait timeout mode；If main control MCU module is returned and shaken hands
Signal, the then order that upper computer module continues to be transmitted into BOOT, if waiting time-out, resends and held to main control MCU module
Hand signal.Upper computer module is transmitted into after BOOT order, waits main control MCU module to return to the life for confirming to enter BOOT
Order, if upper computer module receives the order for confirming to enter BOOT, upper computer module, which enters, prepares data transmission state.Once
Upper computer module receives " start " signal (i.e. " BOOTLOAD " signal) of main control MCU module, is switched on Xmodem Protocol biography
It is defeated.When main control MCU module returns to " end " signal, represent that main control MCU program upgrading data packet is correctly sent completely, on
Position machine will move out Xmodem Protocol, stop transmission.
The course of work of the present invention is as follows：
The inventive method is take into account when upgrading to main control MCU application program using this channel radio of photoelectricity transmission
News mode, and combine the BootLoader functions that main control MCU has in itself, it is to avoid the triviality of dismounting gas meter with
Safety issue, is also one kind innovation to main control MCU application program updating.
Meanwhile, the photoelectric transmission module in main control MCU module is a kind of hardware circuit based on photosensitive T-R tube, is this hair
The underlying hardware circuit of bright all communications, includes transmission, Xmodem Protocol transmission and the main control MCU module upgrading for order of shaking hands
All rely on the circuit.The hardware circuit can apply to a variety of data transfers, and maximum communication baud rate is up to 1Mbps or so.
Brief description of the drawings
Fig. 1 illustrates for Xmodem Protocol.
Fig. 2 is flowchart illustrations of the present invention.
Fig. 3 is photoelectric transmission module circuit diagram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As Figure 1-3, a kind of BootLoader programme upgrade methods based on photoelectricity transmission, the present invention is main control MCU
Using BootLoader, this function is communicated module by photoelectric transmission module with upper computer module, in upper computer module
Main control MCU program upgrading data packet is downloaded in main control MCU module with Xmodem Protocol, and main control MCU module and host computer
Module needs synchronism switching baud rate to improve update rate, specifically：Upper computer module sends life of shaking hands to main control MCU module
After order, main control MCU module will return to an order of shaking hands to upper computer module；Upper computer module has correctly received main control MCU
After the order of shaking hands of module, BOOT order can be transmitted into main control MCU module；Subsequent main control MCU module enters BOOT,
An order for confirming to enter BOOT is returned to upper computer module；Upper computer module starts Xmodem Protocol, starts to transmit master control
MCU programs upgrading data packet and the ROM for writing with a brush dipped in Chinese ink main control MCU module.
Implementation process of the present invention includes three modules：Upper computer module, photoelectric transmission module and main control MCU module；And light
Electrical transmission module is integrated in main control MCU module, upper computer module by photoelectric transmission module by main control MCU program upgrade data
Bag is transferred to main control MCU module, and main control MCU module is upgraded.
Described upper computer module includes data format conversion unit, transmission unit, and upper computer module is supporting is provided with
The Integrated Light dateline of USB interface, so that data communication can be carried out between upper computer module and photoelectric transmission module；
Described main control MCU module is corresponding with upper computer module, and main control MCU module is received by photoelectric transmission module
After the order of shaking hands that transmission unit is sent in upper computer module, into BOOT wait states, then return to a handshake and give
Upper computer module；When receiving order of the upper computer module into BOOT, main control MCU module goes forward side by side BOOT flag bit set
Enter BOOT states, return again to one and confirm the order for coming into BOOT to upper computer module；Main control MCU module enters after BOOT
(main control MCU has been automatically converted to 9600bps baud rates), main control MCU module sends a string of initial datas into BOOT
" BOOTLOAD " gives upper computer module, and main control MCU program upgrading data packet is transferred to main control MCU by upper computer module after receiving
Module；The mode that main control MCU module is received using interrupting writes the main control MCU program upgrading data packet received in ROM, and
Complete program burn writing.
Described photoelectric transmission module is integrated in main control MCU module, and the Integrated Light dateline of upper computer module USB interface is first
The electric signal of main control MCU program upgrading data packet is first converted into optical signal, photoelectric transmission module, photoelectricity transmission is then transferred to
The optical signal of reception is converted into electric signal by module, is then transferred to main control MCU module；
As shown in figure 3, described photoelectric transmission module is divided into two units of infrared emission and infrared receiver：
Infrared emission unit is by three resistance (resistance R1, resistance R2, resistance R3), a triode (Q1) and one
Infrared transmitting tube (D1) is constituted；Resistance R1 one end is connected with resistance R2 one end, and this terminates to main control MCU module
The transmission mouthful Tx of microcontroller serial port；Resistance R1 another termination infrared transmitting tube D1 positive pole, and this termination power is just
Pole；Infrared transmitting tube D1 negative pole connecting resistance R3 one end, resistance R3 another termination PNP triode Q1 emitter stage, PNP tri-
The pole pipe Q1 ground level connecting resistance R2 other end, PNP triode Q1 grounded collector；Described infrared emission cast is
D1AT205。
Infrared receiver by three resistance (resistance R4, resistance R5, resistance R6), two electric capacity (C1, C2), one three
Pole pipe (Q2) and a photosensitive receiving tube (D2) are constituted；Resistance R5 one end is connected to ground, at the same with electric capacity C1 one end and
NPN triode Q2 transmitting tube is connected；The resistance R5 other end is connected with the electric capacity C1 other end, at the same with NPN triode Q2
Base stage be connected with resistance R4 one end；The resistance R4 other end is connected with photosensitive receiving tube D2 positive pole；Photodiode
Negative pole is connected with positive source, while being connected with resistance R6 one end；The resistance R6 other end is connected with electric capacity C2 one end,
It is connected simultaneously with the serial ports receiving terminal Rx and NPN triode Q2 of the single-chip microcomputer of main control MCU module colelctor electrode；Electric capacity C2's is another
One end is connected to the ground.
Described Xmodem Protocol：
Xmodem Protocol is proposed and realized in 1970s by Ward Christensen earliest, transmits data unit
For packet, the form of packet is as follows：
| Byte1 | Byte2 | Byte3 | Byte4~Byte131 | Byte132 | | Start Of Header |
PacketNumber |~(PacketNumber) | Packet Data | Check Sum |
Start Of Header are defined as 0x01；PacketNumber is the numbering of packet；~(PacketNumber)
Negated for the numbering of packet；Check Sum are and verified, and verification computational methods are the tired of Packet Data (128 byte)
Plus and, a byte is accounted for due to verification and only, if cumulative and more than 255, the continuation that will start from scratch is cumulative, disregards carry.
Described data format conversion unit：
Download program file format is .hxf file formats, it is necessary to which being converted into binary code could be entered by photoelectricity burning
In single-chip microcomputer ROM, this upper computer module realizes that this is changed using I/O Stream, and specific data conversion format is as follows：
.hxf file reads rule：
Example ":ABCDEFGHIJKLMNOPQRXTUVWXYZabcdefghijklmnop " can be counted as " 0xAB 0xCD
0xEF 0xGH 0xIJ 0xKL 0xMN 0xOP 0xQR 0xST 0xUV 0xWX 0xYZ 0xab 0xcd 0xef 0xgh
0xij 0xkl 0xmn 0xop”
First character section 0xAB represents the length of one's own profession data；
Second and third byte 0xCD 0xEF represent the initial address of one's own profession data；
Nybble 0xGH represents data type, and data type has：0x00、0x01、0x02、0x03、 0x04、0x05.With
It is respectively each data type down：
'00'Data Rrecord：For record data, most of record of HEX files is all data record
'01'End of File Record:For identifying the end of file, the last of file is placed on, mark HEX files
Ending
'02'Extended Segment Address Record:For identifying the record of extension sector address
'03'Start Segment Address Record:Start sector address record
'04'Extended Linear Address Record:For identifying the record of extension linear address
'05'Start Linear Address Record:Start linear address record
After data type for data, last byte 0xop for verification and.If data address is discontinuous, use
0xFF is filled up.
The agreement interacted between described main control MCU module and upper computer module：
First have to determine the baud rate that main control MCU module is communicated with upper computer module.Enter in main control MCU module
Before BootLoader, only simple handshake between main control MCU module and upper computer module, so the baud of communication
Calibration is 2400bps.After main control MCU module enters BootLoader, start the biography of main control MCU program upgrading data packet
Defeated, then the baud rate of main control MCU module and upper computer module is promoted to 9600bps, to improve main control MCU program upgrading data packet
Transmit the speed write with a brush dipped in Chinese ink.
Main control MCU module is with the mechanism that upper computer module is shaken hands：
Upper computer module is sent after an order of shaking hands, into wait timeout mode；If main control MCU module is returned and shaken hands
Signal, the then order that upper computer module continues to be transmitted into BOOT, if waiting time-out, resends and held to main control MCU module
Hand signal.Upper computer module is transmitted into after BOOT order, waits main control MCU module to return to the life for confirming to enter BOOT
Order, if upper computer module receives the order for confirming to enter BOOT, upper computer module, which enters, prepares data transmission state.Once
Upper computer module receives " start " signal (i.e. " BOOTLOAD " signal) of main control MCU module, is switched on Xmodem Protocol biography
It is defeated.When main control MCU module returns to " end " signal, represent that main control MCU program upgrading data packet is correctly sent completely, on
Position machine will move out Xmodem Protocol, stop transmission.
Embodiment：
Program upgrading object, a collection with USB interfaces are used as by a ultrasonic intelligent gas meter, flow meter in this embodiment
Into photometer head and computer host computer connecting communication, Integrated Light dateline can magnetic suck above ultrasonic intelligent gas meter, flow meter photoelectric circuit
Transparent watchcase on, as long as actual carry out host computer operation on computers.
Fig. 1 is Xmodem Protocol transfer process, and sender only supports the transmission means with verification sum, and recipient is first
Send NAK signals and initiate transmission, if sender does not have data to return, it is necessary to which recipient is after the waiting-timeout time
NAK signals are initiated again to carry out data transmission.If the data transfer that sender sends is correct, recipient needs to send ACK letters
Number confirmed；If data transfer is wrong, recipient sends NAK signals.Sender needs after NAK signals are received
Again this data transfer is initiated, until this data are correctly transmitted.If all data transfers are completed, sender needs
EOT signal is sent to recipient, the end signal of this data transfer is used as.And when recipient sends CAN signal, sender
Receive after CAN signal, then directly unconditionally terminate this transmitting procedure, without retransmiting EOT to recipient.
Fig. 2 is the basic procedure diagram of the present invention, and the flowchart illustrations are above-mentioned upper computer module and main control MCU module
The summary of program function.Host computer is sent after an order of shaking hands, into wait timeout mode.If main control MCU receives this
Individual handshake, then return to a handshake to host computer；If main control MCU is not received by this handshake or reception
To other signals of mistake, then handshake is not returned to, then host computer will wait time-out.If host computer waits time-out,
Handshake will be resend；If host computer receives the handshake of main control MCU return, host computer is transmitted into BOOT
Order, wait main control MCU return confirm enter BOOT order.Main control MCU receives the order into BOOT, then set BOOT
Flag bit, and enter BOOT, return to an order for confirming to enter BOOT to host computer.Host computer, which is received, to be confirmed to enter BOOT's
After order, host computer, which enters, prepares data transmission state.Once host computer receives " start " signal of main control MCU, it is switched on
Xmodem Protocol is transmitted, and baud rate is switched into 9600bps.After the completion of being write with a brush dipped in Chinese ink to the program of main control MCU, main control MCU meeting
When returning to " end " signal, representation program correctly sends and writes with a brush dipped in Chinese ink completion, and host computer will move out Xmodem Protocol after receiving, stop
Only transmit.
Claims (5)
1. a kind of BootLoader programme upgrade methods based on photoelectricity transmission, it is characterised in that including three modules：Host computer
Module, photoelectric transmission module and main control MCU module；And photoelectric transmission module is integrated in main control MCU module, upper computer module is led to
Cross photoelectric transmission module and main control MCU program upgrading data packet is transferred to main control MCU module, main control MCU module is upgraded；
Described upper computer module includes data format conversion unit, transmission unit, and the supporting USB that is provided with of upper computer module connects
The Integrated Light dateline of mouth, so that data communication can be carried out between upper computer module and photoelectric transmission module；
Described main control MCU module is corresponding with upper computer module, and main control MCU module is received upper by photoelectric transmission module
After the order of shaking hands that transmission unit is sent in machine module, into BOOT wait states, a handshake is then returned to upper
Machine module；When receiving order of the upper computer module into BOOT, main control MCU module enters BOOT flag bit set
BOOT states, return again to one and confirm the order for coming into BOOT to upper computer module；Main control MCU module enters after BOOT certainly
Dynamic to be converted into 9600bps baud rates, main control MCU module sends a string and enters BOOT initial data " BOOTLOAD " to host computer
Main control MCU program upgrading data packet is transferred to main control MCU module by module, upper computer module after receiving；Main control MCU module profit
The mode received with interrupting writes the main control MCU program upgrading data packet received in ROM, and completes program burn writing；
Described photoelectric transmission module is integrated in main control MCU module, and the Integrated Light dateline of upper computer module USB interface first will
The electric signal of main control MCU program upgrading data packet is converted into optical signal, is then transferred to photoelectric transmission module, photoelectric transmission module
The optical signal of reception is converted into electric signal, main control MCU module is then transferred to.
2. a kind of BootLoader programme upgrade methods based on photoelectricity transmission according to claim 1, it is characterised in that
Described photoelectric transmission module is divided into two units of infrared emission and infrared receiver：
Infrared emission unit is made up of three resistance, a triode and an infrared transmitting tube；Resistance R1 one end and electricity
The one end for hindering R2 is connected, and the transmission mouthful Tx of this microcontroller serial port for terminating to main control MCU module；The resistance R1 other end
Connect infrared transmitting tube D1 positive pole, and the positive pole of this termination power；Infrared transmitting tube D1 negative pole connecting resistance R3 one end,
Resistance R3 another termination PNP triode Q1 emitter stage, the PNP triode Q1 ground level connecting resistance R2 other end, the poles of PNP tri-
Pipe Q1 grounded collector；
Infrared receiver is made up of three resistance, two electric capacity, a triode and a photosensitive receiving tube；Resistance R5's
One end is connected to ground, while being connected with electric capacity C1 one end and NPN triode Q2 transmitting tube；The resistance R5 other end and electric capacity
The C1 other end is connected, while being connected with NPN triode Q2 base stage and resistance R4 one end；The resistance R4 other end with it is photosensitive
Reception pipe D2 positive pole connection；The negative pole of photodiode is connected with positive source, while being connected with resistance R6 one end；Resistance
The R6 other end is connected with electric capacity C2 one end, while serial ports the receiving terminal Rx and NPN tri- with the single-chip microcomputer of main control MCU module
Pole pipe Q2 colelctor electrode is connected；The electric capacity C2 other end is connected to the ground.
3. a kind of BootLoader programme upgrade methods based on photoelectricity transmission according to claim 1, it is characterised in that
Main control MCU program upgrading data packet in upper computer module is downloaded in main control MCU module with Xmodem Protocol, described
Xmodem Protocol：
Xmodem Protocol is proposed and realized in 1970s by Ward Christensen earliest, transmits data unit to believe
Breath bag, the form of packet is as follows：
| Byte1 | Byte2 | Byte3 | Byte4~Byte131 | Byte132 | | Start Of Header | PacketNumber |
~(PacketNumber) | Packet Data | Check Sum | Start Of Header are defined as 0x01；PacketNumber
For the numbering of packet；~(PacketNumber) negates for the numbering of packet；Check Sum are and verified, and master gage
Calculation method for the cumulative of Packet Data and, account for due to verification and only a byte, will be from zero if cumulative and more than 255
Start to continue cumulative, disregard carry.
4. a kind of BootLoader programme upgrade methods based on photoelectricity transmission according to claim 1, it is characterised in that
The agreement interacted between described main control MCU module and upper computer module：
First have to determine the baud rate that main control MCU module is communicated with upper computer module；Enter BootLoader in main control MCU module
Before, only simple handshake between main control MCU module and upper computer module, so the baud rate of communication is set to
2400bps；After main control MCU module enters BootLoader, start the transmission of main control MCU program upgrading data packet, then lead
The baud rate of control MCU module and upper computer module is promoted to 9600bps, to improve main control MCU program upgrading data packet transmission brush
The speed write.
5. a kind of BootLoader programme upgrade methods based on photoelectricity transmission according to claim 1, it is characterised in that
Main control MCU module is with the mechanism that upper computer module is shaken hands：
Upper computer module is sent after an order of shaking hands, into wait timeout mode；If main control MCU module returns to letter of shaking hands
Number, then upper computer module continues to be transmitted into BOOT order to main control MCU module, if waiting time-out, resends and shakes hands
Signal；Upper computer module is transmitted into after BOOT order, waits main control MCU module to return to the order for confirming to enter BOOT,
If upper computer module receives the order for confirming to enter BOOT, upper computer module, which enters, prepares data transmission state；Once it is upper
Machine module receives " start " signal of main control MCU module, is switched on Xmodem Protocol transmission；When main control MCU module returns to one
During individual " end " signal, represent that main control MCU program upgrading data packet is correctly sent completely, host computer will move out Xmodem Protocol, stop
Only transmit.
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