CN110147243A - A kind of multi-chip communication means and system - Google Patents
A kind of multi-chip communication means and system Download PDFInfo
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- CN110147243A CN110147243A CN201910511924.0A CN201910511924A CN110147243A CN 110147243 A CN110147243 A CN 110147243A CN 201910511924 A CN201910511924 A CN 201910511924A CN 110147243 A CN110147243 A CN 110147243A
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- 238000004891 communication Methods 0.000 title claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 9
- 230000003139 buffering effect Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1433—Saving, restoring, recovering or retrying at system level during software upgrading
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
- G06F8/654—Updates using techniques specially adapted for alterable solid state memories, e.g. for EEPROM or flash memories
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Abstract
The invention discloses a kind of multi-chip communication means and systems, directly carry out data communication by CAN controller between MCU and MPU.Whether MCU detection MPU normally starts, if MPU normally starts failure, MCU can configure MPU and be started by alternate program.Due to CAN controller have the characteristics that it is very much, such as after transmitting and receiving buffering, reliable error handle and error-detection mechanism and the information of transmission are destroyed, it can retransmit automatically, the reliability of communication when being communicated, is improved while substantially reducing program complexity by CAN controller.And since communication mode and MCU of the MPU between MCU are as the communication mode between vehicle, the code reuse of MCU program is improved.Either upgrade MCU program from external CAN bus and still upgrade MCU program from the CAN bus of MPU, MCU program only needs to realize the updating protocol based on CAN just, and the port of different only CAN is different.
Description
Technical field
The invention belongs to fields of communication technology, more particularly, to a kind of multi-chip communication means and system.
Background technique
Currently, full liquid crystal automobile instrument is generally made of microprocessor (MPU) and microcontroller (MCU), wherein MPU is main
It is responsible for the display of graphical interfaces, MCU is mainly responsible for the acquisition and processing of vehicle data.On the market in full liquid crystal automobile instrument
Be substantially between MCU and MPU by Serial Peripheral Interface (SPI) (SPI) module or universal asynchronous receiving-transmitting transmitter (UART) module into
Row data communication and program update.Since the UART module and SPI module of MCU do not have First Input First Output (FIFO) buffering, lead
One byte of every transmitting-receiving is caused to require to interrupt to handle, however frequent interrupt can impact the processing of MCU main task.And
And since UART module and SPI module do not have hardware response and verification scheme, need to synchronize data by software and
Verification, these factors all increase the complexity of program, reduce the reliability of system communication speed and system.In order to improve system
Reliability, generally store backup startup program with single piece of serial flash (FLASH), but will increase BOM in this way
(Bill of Materials) cost.Some full liquid crystal automobile instrument producers can dispense FLASH to save BOM cost, from
And the reliability of system is caused to reduce.In terms of program upgrading, general MCU passes through CAN (Controller Area Network)
UDS (Unified Diagnostic Services) agreement of bus carrys out upgrade procedure, and full liquid crystal instrument needs to pass through MPU
To upgrade MCU program.Therefore two sets of upgrade procedure, CAN bus UDS updating protocol outside a set of realization, Yi Taoshi are needed in MCU
Existing internal UART or SPI interface updating protocol, also will increase the complexity of MCU program in this way.
It is, therefore, desirable to provide a kind of do not increase BOM cost while reducing the multi-chip communication means of system communication complexity
And system.
Summary of the invention
The purpose of the present invention is to provide a kind of multi-chip communication means and systems, for solving in MCU in the prior art
Need two sets of upgrade procedure, CAN bus UDS updating protocol outside a set of realization, a set of realization inside UART or SPI interface upgrading
Agreement, the problem of increasing the complexity of MCU program.
In order to solve the above-mentioned technical problem, the first aspect of the present invention provides a kind of multi-chip communication means, comprising steps of
Step S1:MCU detects whether MPU normally starts by CAN controller, if so, terminating, if it is not, then entering S2；
Step S2: the MPU reads the stand-by program of the FLASH inside the MCU；
Step S3: the MPU is started by the stand-by program.
Optionally, the step S2 includes:
The MCU configures the MPU and is started by SPI mode, and the SPI mode passes through SPI interface from institute for the MPU
It states and reads the stand-by program in FLASH.
Optionally, the MCU configures the MPU by GPIO and is started by the SPI mode.
Optionally, the step S3 includes:
The stand-by program is loaded into flash memory, and the MPU passes through the stand-by program starting in the flash memory.
Optionally, further include step S4:
The MPU is updated or is upgraded by program of the CAN controller to the MCU.
The second aspect of the present invention proposes a kind of multichip system, be used for automobile instrument, using features described above describe in appoint
A kind of multi-chip communication means, including MCU, MPU and CAN controller；
The MCU includes being stored with stand-by program in a FLASH and the FLASH, is passed through between the MCU and the MPU
The CAN controller two-way communication link, the MCU for detect the MPU whether normally starting and it is normal in the MPU
The MPU is configured after starting failure to start by stand-by program.
Optionally, the MCU detects whether the MPU normally starts by heartbeat mechanism.
It optionally, further include flash memory, the flash memory is used to store the startup program and the load backup journey of the MPU
Sequence.
Optionally, the flash memory includes normal subregion and backup subregion.
Optionally, the normal subregion is for storing the startup program, and the backup subregion is for loading the backup
Program.
Optionally, the flash memory is eMMC or SSD or UFS.
The present invention proposes a kind of multi-chip communication means, and by the direct-connected communication of CAN controller between MPU and MCU, MCU is logical
Cross CAN controller detection MPU whether normally start, and when MPU normally start fail after, the MPU can be by the MCU inside
Alternate program starting.Since communication mode and MCU of the MPU between MCU are as the communication mode between vehicle, improve
The code reuse of MCU program.Either upgrade MCU program from external CAN bus still to upgrade from the CAN bus of MPU
MCU program, MCU program only need to realize the updating protocol based on CAN just, and the port of different only CAN is different.
In addition, invention also proposes a kind of multichip system, data are directly carried out by CAN controller between MCU and MPU and are led to
Letter.Whether MCU detection MPU normally starts, since MCU generally provides the above CAN module in 2 tunnels and 2 tunnels, the CAN module that MPU is provided
More, general automobile instrument and vehicle communication only need 1 tunnel CAN module, and such MPU and MCU have idle CAN mould
Block can be used, and due to not needing transceiver, to will not increase BOM cost.Since CAN controller has many spies
Point, such as transmit and receive buffering, after reliable error handle and error-detection mechanism and the information of transmission are destroyed, it can weigh automatically
Hair etc., when being communicated, improves the reliability of communication by CAN controller while substantially reducing program complexity.
And since communication mode and MCU of the MPU between MCU are as the communication mode between vehicle, the generation of MCU program is improved
Code reusability.Either upgrade MCU program from external CAN bus and still upgrades MCU program, MCU from the CAN bus of MPU
Program only needs to realize the updating protocol based on CAN just, and the port of different only CAN is different.
Detailed description of the invention
Fig. 1 is a kind of multi-chip communication means flow diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of multichip system structural schematic diagram provided in an embodiment of the present invention；
10-MCU, 101-FLASH, 20-MPU, 30-CAN controller, 40- flash memory, the normal subregion of 401-, 402- backup point
Area.
Specific embodiment
A specific embodiment of the invention is described in more detail below in conjunction with schematic diagram.According to following description and
Claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and
Using non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
As depicted in figs. 1 and 2, the embodiment of the present invention provides a kind of multi-chip communication means, comprising steps of
Step S1:MCU10 detects whether MPU20 normally starts by CAN controller 30, if so, terminating, if it is not, then
Into S2；
Step S2: the MPU20 reads the stand-by program of the FLASH101 inside the MCU10；
Step S3: the MPU20 is started by the stand-by program.
Can directly it be passed through between MCU10 and MPU20 by 30 two-way communication link of CAN controller between MCU10 and MPU20
30 two-way communication link of CAN controller such as transmits and receives buffering, reliable wrong since CAN controller 30 has the characteristics that very much
After accidentally processing and error-detection mechanism and the information of transmission are destroyed, it can retransmit, be led to by CAN controller 30 automatically
When letter, the reliability of communication is improved while substantially reducing program complexity.And due between MPU20 and MCU10
Communication mode and MCU10 improve the code reuse of MCU10 program as the communication mode between vehicle.Either from
External CAN bus still upgrades MCU10 program from the CAN bus of MPU20 to upgrade MCU10 program, and MCU10 program only needs
Realize the updating protocol based on CAN just, the port of different only CAN is different.The MCU10 is detected by CAN communication
Whether the MPU20 normally starts, if the MCU10 detects that the MPU20 normally starts, does not need to execute
Other instructions.If the MCU10 detects that the MPU20 can not normally start, at this point, the MCU10 can configure it is described
MPU20 is started by alternate program, and the backup startup program of MPU20 is storable in the FLASH101 of MCU10.
Optionally, the step S2 can include: the MCU10 configures the MPU20 and started by SPI mode, the SPI
Mode reads the stand-by program by SPI interface for the MPU20 from the FLASH101.It should be noted that described
MCU10 can be configured the MPU20 by GPIO and be started by the SPI mode, and the MCU10 and MPU20 is logical at this time
Cross that simplex communication mode is communicated namely the MCU10 sends configuration to the MPU20 by the GPIO of the MCU10 and refers to
It enables.After the MPU20 receives the instruction from the MCU10, the following MCU10 and MPU20 passes through SPI interface
Communication, need to be communicated according to SPI protocol.Namely the MPU20 is carried out according to SPI protocol by SPI interface and the MCU10
Communication, the MPU20 read backup startup program from the FLASH101 inside the MCU10 by SPI interface and are started.
Optionally, it may also include a flash memory 40, the flash memory 40 is used to store the startup program and load of the MPU20
The stand-by program.
Further, the flash memory 40 includes normal subregion 401 and backup subregion 402.The normal subregion 401 is used for
The startup program is stored, the backup subregion 402 is for loading the stand-by program.It should be noted that the flash memory 40
It can be the nand flash memory 40 of eMMC or SSD or UFS or some other types, herein with no restrictions.When the MCU10 is examined
Measuring the MPU20 can not normally start, and be started at this point, the MCU10 can configure the MPU20 by alternate program, described
MCU10 is communicated with the MPU20 by SPI interface, need to be communicated according to SPI protocol.Namely the MPU20 is assisted according to SPI
View is communicated by SPI interface with the MCU10, and the MPU20 is by SPI interface inside the MCU10
FLASH101 reads backup startup program and is started.The stand-by program can be loaded into the backup subregion 402 of the flash memory 40
In, the MPU20 is started by the stand-by program.It should be noted that the MPU20 is loaded directly into institute when normal starting
State the startup program in normal subregion 401.
Optionally, the MCU10 detects whether the MPU20 normally starts by heartbeat mechanism.Heartbeat mechanism is in network
The communications field, which refers to, regularly sends a customized structural body (namely heartbeat message), and other side is allowed to know that oneself also lives, with
The mechanism for the validity for ensuring to connect.The MPU20 is sent by CAN communication to the MCU10 in embodiments of the present invention
Heartbeat message, and the MCU10 monitors the heartbeat message of the MPU20 by CAN communication.Once starting in the MPU20
Discovery heartbeat message has exception in the process, that is to say, the bright MPU20 can not normally start, thus described in MCU10 configuration
MPU20 starts from SPI mode.
As shown in Fig. 2, the embodiment of the present invention also proposes a kind of multichip system, it can be used for automobile instrument, including MCU10,
MPU20 and CAN controller 30.The MCU10 includes being stored with stand-by program in a FLASH101 and the FLASH101, institute
It states by 30 two-way communication link of CAN controller between MCU10 and the MPU20, the MCU10 is described for detecting
Whether MPU20, which normally starts and configure the MPU20 after the MPU20 normally starts failure, passes through stand-by program starting.
In addition, the MPU20 can also be used to that the program of the MCU10 is updated or be upgraded by the CAN controller 30.Wherein
The MPU20 is mainly responsible for the display of graphical interfaces, and the MCU10 is mainly responsible for the acquisition and processing of vehicle data.
Compared with prior art, CAN controller 30 has the characteristics that very much, such as transmits and receives at buffering, reliably mistake
After reason and error-detection mechanism and the information of transmission are destroyed, it can retransmit automatically, carry out communicating and can substantially reducing by CAN
Program complexity, and the reliability of communication can be improved.Simultaneously because communication mode and MCU10 and vehicle between MPU20 and MCU10
Communication mode between is the same, improves the code reuse of MCU10 program, such as either upgrades from external CAN bus
MCU10 program still upgrades MCU10 program from the CAN bus of MPU20, and MCU10 program only needs to realize the upgrading based on CAN
Just, the port of different only CAN is different for agreement.The standby of MPU20 program can be provided by MCU10 in-chip FLASH 101
With startup program, system is provided in the case where no increase BOM cost and restores function, provides the reliable of system significantly
Property.
Optionally, the MCU10 detects whether the MPU20 normally starts by heartbeat mechanism.In the embodiment of the present invention
Described in MPU20 give the MCU10 to send heartbeat message by CAN communication, and the MCU10 is monitored by CAN communication
The heartbeat message of the MPU20.Once finding that heartbeat message has exception in the MPU20 start-up course, that is to say, bright described
MPU20 can not normally start, and start so that the MCU10 can configure the MPU20 from SPI mode.
It further include flash memory 40, the flash memory 40 is used to store the startup program and the load backup journey of the MPU20
Sequence.
Optionally, the flash memory 40 includes normal subregion 401 and backup subregion 402.
Optionally, the normal subregion 401 is for storing the startup program, and the backup subregion 402 is for loading institute
State stand-by program.
It should be noted that the flash memory 40 can dodge for eMMC or SSD or UFS or the NAND of some other types
40 are deposited, herein with no restrictions.
Data communication is directly carried out by the CAN controller 30 between the MPU20 and the MCU10, due to described
MCU10 generally provides the above CAN module in 2 tunnels and 2 tunnels, and the CAN module that the MPU20 is provided is more, and general automobile instrument
1 tunnel CAN module is only needed with vehicle communication, therefore the MPU20 and the MCU10 can make in the presence of idle CAN module
With, and due to not needing transceiver, so that BOM cost will not be increased.The backup startup program of the MPU20 is storable in institute
It stating in the in-chip FLASH 101 of MCU10, the MCU10 detects whether the MPU20 has normally started by heartbeat mechanism,
If normal starting failure, configures MPU20 by GPIO and is started from standby system, when MPU20 needs to start standby system
When, startup program is read from MCU10 in-chip FLASH 101 by SPI and is started, backup startup program can be from the backup of eMMC
402 loading system program of subregion, thus the operation of recovery system.
In conclusion the present invention proposes a kind of multi-chip communication means and system, pass through CAN controller between MCU and MPU
Directly carry out data communication.Whether MCU detection MPU normally starts, if MPU normally starts failure, MCU can configure MPU and pass through
Alternate program starting, the backup startup program of MPU are stored in the FLASH of MCU.Since MCU generally provides 2 tunnels and 2 tunnels or more
CAN module, the CAN module that MPU is provided is more, and general automobile instrument and vehicle communication only need 1 tunnel CAN module, in this way
MPU and MCU can be used in the presence of idle CAN module, and due to not needing transceiver, to will not increase BOM cost.
Since CAN controller has the characteristics that very much, such as buffering, reliable error handle and error-detection mechanism and transmission are transmitted and received
It after information is destroyed, can retransmit automatically, program complexity when being communicated, is being substantially reduced by CAN controller
The reliability of communication is improved simultaneously.And due to the communication party between the communication mode and MCU and vehicle between MPU and MCU
Formula is the same, improves the code reuse of MCU program.Either upgrade MCU program from external CAN bus still from MPU's
CAN bus upgrades MCU program, and MCU program only needs to realize the updating protocol based on CAN just, the end of different only CAN
Mouth is different.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example " or " specifically show
The description of example " etc. means that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in the present invention
At least one embodiment or example in.In the present specification, schematic expression of the above terms are necessarily directed to phase
Same embodiment or example.And particular features, structures, materials, or characteristics described can be real in any one or more
Applying in example can be combined in any suitable manner.In addition, those skilled in the art can be by different embodiments described in this specification
Or example is engaged and is combined.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (11)
1. a kind of multi-chip communication means, which is characterized in that comprising steps of
Step S1:MCU detects whether MPU normally starts by CAN controller, if so, terminating, if it is not, then entering S2；
Step S2: the MPU reads the stand-by program of the FLASH storage inside the MCU；
Step S3: the MPU is started by the stand-by program.
2. multi-chip communication means as described in claim 1, which is characterized in that the step S2 includes:
The MCU configures the MPU and is started by SPI mode, and the SPI mode is that the MPU passes through SPI interface from described
The stand-by program is read in FLASH.
3. multi-chip communication means as claimed in claim 2, which is characterized in that the MCU configures the MPU by GPIO and leads to
Cross the SPI mode starting.
4. multi-chip communication means as described in claim 1, which is characterized in that the step S3 includes:
The stand-by program is loaded into flash memory, and the MPU passes through the stand-by program starting in the flash memory.
5. multi-chip communication means as described in claim 1, which is characterized in that further include step S4:
The MPU is updated or is upgraded by program of the CAN controller to the MCU.
6. a kind of multichip system is used for automobile instrument, which is characterized in that including MCU, MPU and CAN controller；
The MCU includes being stored with stand-by program in a FLASH and the FLASH, by described between the MCU and the MPU
CAN controller two-way communication link, the MCU is for detecting whether the MPU normally starts and normally start in the MPU
The MPU is configured after failure to start by stand-by program.
7. multichip system as claimed in claim 6, which is characterized in that the MCU, which detects the MPU by heartbeat mechanism, is
No normal starting.
8. multichip system as claimed in claim 6, which is characterized in that further include flash memory, the flash memory is described for storing
The startup program and the load stand-by program of MPU.
9. multichip system as claimed in claim 8, which is characterized in that the flash memory includes normal subregion and backup point
Area.
10. multichip system as claimed in claim 9, which is characterized in that the normal subregion is for storing the starting journey
Sequence, the backup subregion is for loading the stand-by program.
11. multichip system as claimed in claim 8, which is characterized in that the flash memory is eMMC or SSD or UFS.
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| CN201910511924.0A CN110147243A (en) | 2019-06-13 | 2019-06-13 | A kind of multi-chip communication means and system |
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| CN111736578A (en) * | 2020-08-14 | 2020-10-02 | 广州汽车集团股份有限公司 | Dual-CPU controller-based UDS diagnosis method and device |
| CN111845345A (en) * | 2020-06-28 | 2020-10-30 | 东风电驱动系统有限公司 | Automobile full liquid crystal instrument display state screenshot transmission method |
| CN112398711A (en) * | 2020-09-23 | 2021-02-23 | 卡斯柯信号有限公司 | CAN bus communication method for safety computer |
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