CN109885524A - A kind of serial ports expansion method of the airborne indicator based on FPGA - Google Patents
A kind of serial ports expansion method of the airborne indicator based on FPGA Download PDFInfo
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- CN109885524A CN109885524A CN201910135712.7A CN201910135712A CN109885524A CN 109885524 A CN109885524 A CN 109885524A CN 201910135712 A CN201910135712 A CN 201910135712A CN 109885524 A CN109885524 A CN 109885524A
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Abstract
Present invention discloses a kind of serial ports expansion methods of airborne indicator based on FPGA, the airborne indicator includes main control unit MCU and programmable device FPGA, programmable device FPGA includes SPI sending/receiving module, SPI receiving module, UART sending module, UART receiving module, SEND_FIFO sends caching, REC_FIFO receives caching, establish SPI data communication, design FIFO caching mechanism, UART data collecting mechanism is established, realizes the foundation of external serial communication.The present invention solves the problems, such as that traditional monitor MCU serial port resource is inadequate, builds for hardware circuit compared to serial port chip is turned using SPI, can reduce hardware cost and improves the flexibility ratio of hardware design.It is used suitable for airborne indicator, serial ports expansion reliable design.
Description
Technical field
The present invention relates to a kind of serial ports expansion method more particularly to a kind of serial ports expansions of the airborne indicator based on FPGA
Method belongs to the technical field of airborne indicator serial ports expansion.
Background technique
In modern Aviation airborne display system, traditional airborne indicator having a single function is by multi-functional airborne aobvious
Show replaced device, airborne indicator is mainly used for showing various parameters and the picture etc. that flight course needs, these parameters are main
It is to be obtained by the communication between display and external other equipment, flight environment of vehicle more sophisticated, needs logical with the external world at present
The information for interrogating interaction is more and more, and airborne indicator needs parameter to be shown also to become more, therefore airborne indicator needs pair
The quantity of outer communication also becomes more, external flight environment accurately to be grasped convenient for pilot, and improve the flight of pilot
Experience.
More stringent requirements are proposed for quantity of the multi-functional airborne indicator to display and external communication, airborne display field
In, serial communication is the most common external communication modes of airborne display field.Multi-functional airborne indicator is to serial communication resource
It is more demanding, current airborne indicator communication module is the most commonly used is the hardware structure based on MCU+FPGA, but the string of MCU
Mouth resource is limited, is insufficient for the communication quantitative requirement of multifunction display.Although most of MCU include SPI and IIC etc. logical
Communication interface, but directly cannot externally communicate, for such issues that, also occur some SPI in the market and turn the agreements such as serial ports turning
Chip is changed, but price is more expensive, improves development cost；And it once selectes certain chip and builds hardware circuit, and is outer
The mode of portion's serial communication has just fixed, and is unfavorable for the Function Extension in multi-functional airborne indicator later period.
Summary of the invention
Present invention aim to address above-mentioned the deficiencies in the prior art, for conventional conversion chip price valuableness and serial ports function
The problem of capable of limiting, proposes a kind of serial ports expansion method of airborne indicator based on FPGA.
In order to achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of serial ports expansion method of the airborne indicator based on FPGA, the airborne indicator include main control unit MCU and volume
Journey device FPGA,
It is characterized in that serial ports expansion method the following steps are included:
S1 establishes SPI data communication,
SPI sending/receiving module and SPI receiving module are set in FPGA, establish SPI data communication with MCU；
S2 designs FIFO caching mechanism,
UART sending module, UART receiving module, SEND_FIFO are set in FPGA and send caching, REC_FIFO reception caching,
In external send, SEND_FIFO sends the serial communication data that caching sends the MCU that SPI receiving module receives
It is written and is sent to external serial ports through UART sending module,
When receiving, REC_FIFO receives the data that caching receives UART receiving module and is written, and MCU is by reading REC_
FIFO receives the depth for being stored in data, judges whether carrying out serial communication data receiver, to decide whether to send out
It send the piece of SPI to select with clock signal and establishes SPI data communication.
S3 establishes UART data collecting mechanism,
Baud rate generation module is set in FPGA,
MCU selects the baud rate of external serial communication,
UART sending module judges that SEND_FIFO sends caching non-empty and starts to read the data in SEND_FIFO transmission caching,
And the parity information provided according to MCU, it is serially sent according to the baud rate that MCU is selected,
UART receiving module carries out serioparallel exchange to external serial data according to the baud rate that MCU is selected, and given according to MCU
Type is verified, odd-even check is carried out, if data result is errorless, receives caching correct data write-in REC_FIFO is received,
Otherwise it directly abandons.
The foundation of the external serial communication of S4,
The transmitting-receiving that serial communication is generated by UART sending module and UART receiving module is realized external by electrical level transferring chip
Serial communication.
The beneficial effects are mainly reflected as follows:
1. solving the problems, such as that traditional monitor MCU serial port resource is inadequate, hardware electricity is built compared to serial port chip is turned using SPI
For road, it can reduce hardware cost and improve the flexibility ratio of hardware design.
2. being suitable for airborne indicator to use, serial ports expansion reliable design.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of the serial ports expansion method of the airborne indicator based on FPGA of the present invention.
Specific embodiment
The present invention provides a kind of serial ports expansion method of airborne indicator based on FPGA.Below in conjunction with attached drawing to the present invention
Technical solution is described in detail, so that it is more readily understood and grasps.
A kind of serial ports expansion method of the airborne indicator based on FPGA, as shown in Figure 1, being applied to airborne cockpit display
In, it is made of on hardware composition MCU and FPGA, by SPI receiving module, SPI sending/receiving module, baud rate inside FPGA
Generation module, UART sending module, UART receiving module, SEND_FIFO send caching, REC_FIFO receives the composition such as caching,
As shown in Figure 1.The method takes following steps:
The data that transmitting serial port communicates between MCU and FPGA.
SPI data sending/receiving module is established, send the received external serial data of institute to MCU and receives MCU to outgoing
The serial communication data sent.When externally sending data, FPGA only needs to receive the data that MCU is sent, so only needing one
A SPI receiving module, for that will realize that the string of MOSI output data turns simultaneously；When MCU receives serial communication, it is necessary first to send
One data returns to MCU, then sends out again to FPGA for notifying FPGA by the data length having been written into REC_FIFO
Another data is given, notifies FPGA by the DSR of the storage in FIFO, is sent to MCU, so both being needed when receiving
The sending module of SPI, it is also desirable to the receiving module of SPI, the reception for realizing MCU to external data.
FIFO caching is carried out to data.
SPI data sending/receiving module and UART sending/receiving module are carried out using the on piece storage resource FIFO of FPGA
Data buffer storage, for solving the problems, such as two module data processing speed speeds.In external send, a transmission caching is needed
The serial communication data that the MCU that SPI receiving module receives is sent are written in SEND_FIFO and are cached by SEND_FIFO；It is connecing
Time receiving needs a reception data buffer storage REC_FIFO, the data write-in REC_FIFO caching that UART receiving module is received.
The data rate converted when sending due to SPI receiving module is fast compared with UART sending module data rate, so as to prevent
The problem of only externally sending loss of data.When receiving, the depth that MCU can be stored in data by reading FIFO, judgement
Whether serial communication data receiver is being carried out, is then deciding whether that the piece choosing for sending SPI and clock signal are logical to establish SPI
News.
UART delivery and reception module.
UART delivery and reception module needs a baud rate generation module and parity information, baud rate generation module
It is that 4 kinds of baud rate clock outputs are realized using FPGA, MCU provides baud rate selection signal, for selecting external serial communication
Baud rate.UART sending module judges SEND_FIFO non-empty, begins to read the data in SEND_FIFO, and according to MCU
Parity information is provided, is serially sent according to the baud rate that MCU is selected.The wave that UART receiving module is selected according to MCU
Special rate carries out serioparallel exchange, and the verification type given according to MCU to external serial data, odd-even check is carried out, if data knot
Fruit is errorless, and REC_FIFO is written correct data are received, otherwise directly abandons, is not written into REC_FIFO.
The foundation of external serial communication.
By UART delivery and reception module, the transmitting-receiving of serial communication can produce, then pass through common level conversion
Chip, so that it may realize common external serial communication, the serial communication external from realization MCU.
By above description it can be found that a kind of serial ports expansion method of the airborne indicator based on FPGA of the present invention, solution
It has determined the inadequate problem of traditional monitor MCU serial port resource, has been built for hardware circuit compared to serial port chip is turned using SPI,
It can reduce hardware cost and improve the flexibility ratio of hardware design.It is used suitable for airborne indicator, serial ports expansion reliable design.
Technical solution of the present invention is fully described above, it should be noted that specific embodiment party of the invention
Formula is simultaneously not limited by the description set out above, the Spirit Essence of those skilled in the art according to the present invention structure, method or
All technical solutions that function etc. is formed using equivalents or equivalent transformation, all fall within protection scope of the present invention
Within.
Claims (1)
1. a kind of serial ports expansion method of the airborne indicator based on FPGA, the airborne indicator include main control unit MCU and
Programmable device FPGA,
It is characterized in that serial ports expansion method the following steps are included:
S1 establishes SPI data communication,
SPI sending/receiving module and SPI receiving module are set in FPGA, establish SPI data communication with MCU；
S2 designs FIFO caching mechanism,
UART sending module, UART receiving module, SEND_FIFO are set in FPGA and send caching, REC_FIFO reception caching,
In external send, SEND_FIFO sends the serial communication data that caching sends the MCU that SPI receiving module receives
It is written and is sent to external serial ports through UART sending module,
When receiving, REC_FIFO receives the data that caching receives UART receiving module and is written, and MCU is by reading REC_
FIFO receives the depth for being stored in data, judges whether carrying out serial communication data receiver, to decide whether to send out
It send the piece of SPI to select with clock signal and establishes SPI data communication；
S3 establishes UART data collecting mechanism,
Baud rate generation module is set in FPGA,
MCU selects the baud rate of external serial communication,
UART sending module judges that SEND_FIFO sends caching non-empty and starts to read the data in SEND_FIFO transmission caching,
And the parity information provided according to MCU, it is serially sent according to the baud rate that MCU is selected,
UART receiving module carries out serioparallel exchange to external serial data according to the baud rate that MCU is selected, and given according to MCU
Type is verified, odd-even check is carried out, if data result is errorless, receives caching correct data write-in REC_FIFO is received,
Otherwise it directly abandons；
The foundation of the external serial communication of S4,
The transmitting-receiving that serial communication is generated by UART sending module and UART receiving module is realized external by electrical level transferring chip
Serial communication.
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| CN201910135712.7A CN109885524A (en) | 2019-02-25 | 2019-02-25 | A kind of serial ports expansion method of the airborne indicator based on FPGA |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114595182A (en) * | 2022-03-03 | 2022-06-07 | 珠海昇生微电子有限责任公司 | Bidirectional conversion circuit and method for multiple communication serial ports |
-
2019
- 2019-02-25 CN CN201910135712.7A patent/CN109885524A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114595182A (en) * | 2022-03-03 | 2022-06-07 | 珠海昇生微电子有限责任公司 | Bidirectional conversion circuit and method for multiple communication serial ports |
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Application publication date: 20190614 |