CN103024088A - Method for simultaneous communication of double serial ports - Google Patents
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- CN103024088A CN103024088A CN2012105543715A CN201210554371A CN103024088A CN 103024088 A CN103024088 A CN 103024088A CN 2012105543715 A CN2012105543715 A CN 2012105543715A CN 201210554371 A CN201210554371 A CN 201210554371A CN 103024088 A CN103024088 A CN 103024088A
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Abstract
The invention provides a method for simultaneous communication of double serial ports. The method comprises steps of connecting a first serial port and a second serial port of a first Microprogrammed Control Unit (MCU) to a first serial port and a second serial port of a second MCU or the external first serial port and the external second serial port; detecting the working state of first serial ports and second serial ports by using a data request transmitting party when data are required to be transmitted; transmitting the data request through available ports by using the data request transmitting party in accordance with detection results; and receiving and processing the received data request by using a data receiving party. Two serial ports can conduct data communication at the same time and are independent, communication protocols of two serial ports are the consistent, the speed of serial ports and use efficiency of a central processing unit (CPU) are improved by one time, the stability of communication is greatly improved through double serial port communication, the communication is converted to one serial port when the other serial port goes wrong, and the testing efficiency of products can be improved.
Description
Technical field
The present invention relates to serial port communication technology, relate in particular to the method that a kind of pair of serial ports communicated by letter simultaneously.
Background technology
The data that serial communication is used between MCU and MCU and MCU and the peripheral hardware transmit, and are widely used in the industrial communication field.So-called serial communication refers to that a kind of communication mode of the transmission of data is carried out in step-by-step by data signal line, bottom line, control line etc.The data wire that this communication mode uses is few, can save communications cost in telecommunication.Wherein, RS-232 serial communication mode has the international standard of standard because of it, and is accepted extensively and use by people, and has become the standard interface that has between the serial communication function equipment.
The industrial communication technology has become a most active branch of modern automation technology field development, and various new technology, agreement, standard, product, application emerge in an endless stream, and the double serial port communication technology is exactly a new technology that is applied to the industrial communication field.And only has a full duplex serial port among most of MCU, can not satisfy the demand that many MCU use, can not take full advantage of the treatment effeciency of MCU, have following defective: transmission speed is slow, and efficient is low, this is the greatest drawback of serial communication, if make parallel communications into, then cost can increase, and distance is very short, if use USB instead, then the cost increase is larger; If Serial Port Line has been broken, MCU just cannot with another one MCU or peripheral hardware proper communication; If communication has been interrupted suddenly between serial ports, cannot judge that MCU has quit work or because serial communication obstruction.
Summary of the invention
In order to solve the problems of the prior art, the invention provides the method that a kind of pair of serial ports communicated by letter simultaneously, the method is at serial port communication technology and MIPI interface (Mobile Industry Processor Interface, communication when mobile industry processor interface) realizing two serial ports on the basis, and can between two serial ports, realize according to the signal intelligence of serial ports the seamless switching of transfer of data greatly improving the communication speed of serial ports and the service efficiency of CPU.
The present invention realizes goal of the invention by implementing following technical scheme: a kind of pair of method that serial ports is communicated by letter simultaneously may further comprise the steps:
A) first serial, the second serial with a MCU is connected with first serial, the second serial of the 2nd MCU or peripheral hardware respectively;
B) when having data to send, the request of data transmit leg detects the operating state of first serial, second serial;
C) according to testing result, the request of data transmit leg sends request of data by free serial ports;
D) data receiver receives and processes the request of data of receiving.
As a further improvement on the present invention, described step C comprises step by step following:
C1) obtain the data of asking transmission;
C2) judge whether these data are write first serial, if, execution in step C3; Otherwise, execution in step C4;
C3) these data are write the buffer area corresponding with this serial ports;
C4) judge whether these data are write second serial, if, execution in step C3; Otherwise, execution in step C5;
C5) request of data finishes.
As a further improvement on the present invention, described step D comprises step by step following:
D1) detect first serial, second serial, when receiving that DMA interrupts, execution in step D2;
D2) read the DMA source address data of receiving;
D3) judge whether these DMA data are the data that first serial receives, if, execution in step D4; Otherwise, execution in step D5;
D4) receive also processes data requests;
D5) judge whether these DMA data are the data that second serial receives, if, execution in step D4; Otherwise, execution in step D6;
D6) request of data finishes.
As a further improvement on the present invention, described step D4 comprises step by step following:
D4-1) detect the communications status of first serial, second serial, and judge whether to occur communication disruption, if, execution in step D4-2; Otherwise, execution in step D4-8;
D4-2) judge whether first serial is effective, if, execution in step D4-3; Otherwise, execution in step D4-5;
D4-3) these data are write first serial, and send the data response to the request of data transmit leg;
D4-4) judge whether the request of data transmit leg receives the data response in setting-up time, if, execution in step D4-3; Otherwise, execution in step D4-5;
D4-5) these data are write second serial, and send the data response to the request of data transmit leg;
D4-6) judge whether the request of data transmit leg receives the data response in setting-up time, if, execution in step D4-5; Otherwise, execution in step D7;
D4-7) communication stops;
D4-8) continue to receive the DMA data.
As a further improvement on the present invention, described first serial or second serial are the MIPI interface, and described MIPI interface comprises data wire and markings; Described data wire is used for the reception of data as RXD; Described markings are used for the transmission of data as TXD.
The invention has the beneficial effects as follows: two serial ports can carry out data communication simultaneously, and are separate, and the communication protocol of two serial ports is consistent, all supports RS232, and speed and the efficient of serial ports all is doubled, and also the utilization rate with CPU is doubled; And double serial port communication also improved the stability of communication greatly, when serial ports broken can be seamless another serial ports that switches to continue communication; Double serial port communication also helps to improve the testing efficiency of product in addition, has shortened the construction cycle of product.
Description of drawings
Fig. 1 is the flow chart of a kind of method of double serial port communication in the embodiment of the invention;
Fig. 2 is the flow chart that first serial in the embodiment of the invention, second serial send data;
Fig. 3 is the flow chart of first serial in the embodiment of the invention, second serial receive data;
Fig. 4 is reception and the processes data requests flow chart in the embodiment of the invention;
Fig. 5 is the Principle of Communication figure of serial ports of the present invention;
Fig. 6 is the double serial port communication schematic diagram in the embodiment of the invention.
Embodiment
The present invention is further described below in conjunction with description of drawings and embodiment.
In the embodiment of the method that the two serial ports of the present invention are communicated by letter simultaneously, the flow chart of the method as shown in Figure 1, the method comprises the steps:
Step S11 is connected first serial, the second serial of a MCU respectively with first serial, the second serial of the 2nd MCU or peripheral hardware: in this step, first serial, the second serial of the one MCU are connected with first serial, the second serial of the 2nd MCU or peripheral hardware respectively, first serial, second serial can be communicated simultaneously;
Step S12 is when having data to send, the request of data transmit leg detects the operating state of first serial, second serial: when having data to send, request of data transmit leg (MCU or the 2nd MCU or peripheral hardware) detects the operating state (in having time or communicating by letter) of its first serial, second serial;
Step S13 is according to testing result, and the request of data transmit leg sends request of data by free serial ports: the excessively free serial ports (first serial or second serial) of request of data square tube sends request of data to the data receiver, and concrete handling process as shown in Figure 2;
Step S14 data receiver receives and process the request of data of receiving: the request of data that the data receiver receives and the deal with data transmit leg is sent, concrete handling process as shown in Figure 3.
For the present embodiment, above-mentioned steps S13 particular flow sheet comprises step by step following as shown in Figure 2:
The data that the step S301 request of obtaining sends: obtain and to ask the data that send;
Step S302 judges whether these data are write first serial: in this step, judge whether these data are write first serial, if the result who judges is yes, namely first serial is in idle condition, execution in step S303; Otherwise, execution in step S304;
Step S303 writes the buffer area corresponding with this serial ports with these data: the data that ask to send are write the buffer area corresponding with this serial ports, finish the transmission of data;
Step S304 judges whether these data are write second serial: in this step, judge whether these data are write second serial, if the result who judges is yes, namely second serial is in idle condition, execution in step S303; Otherwise, execution in step S305;
Step S305 request of data finishes: the request of data that finishes this.
When data in the middle of transmission course, when having again data to ask to send, by detecting the operating state of judging request of data transmit leg serial ports, and utilize free serial ports (first serial or second serial) to send data, two serial ports are communicated simultaneously, but the efficiency of transmission of Effective Raise serial ports also can avoid occurring the conflict between the serial ports.
In the middle of practical application, when carrying out a large amount of transfer of data between a MCU and the 2nd MCU or the peripheral hardware, by detecting the communications status of first serial and second serial, rationally utilize the transmittability of two serial ports, can greatly improve the utilance of data transfer speed and serial ports.
For the present embodiment, above-mentioned steps S14 particular flow sheet comprises step by step following as shown in Figure 3:
Step S401 detects first serial, second serial, when receiving DMA(Direct Memory Access, direct memory access) when interrupting, execution in step S402;
Step S402 reads the DMA source address data of receiving: read the DMA source address data of receiving;
Step S403 judges whether these DMA data are the data that first serial receives: in this step, judge whether these DMA data are the data that first serial receives, if the result who judges is yes, be that the request of data transmit leg sends DMA interruption, execution in step S404 by first serial to the data receiver; Otherwise, execution in step S405;
Step S404 receives and processes data requests: the data communication device that receives is crossed corresponding serial ports carry out the DMA transfer of data between a MCU and the 2nd MCU or peripheral hardware; And need not CPU, the DMA transmission means directly controls transmission, there is not Interrupt Processing Model to keep like that the process of on-the-spot and restoring scene yet, only need when beginning, to provide original position and the data length of the data that will transmit, be RAM(random access memory by hardware, random asccess memory) opens up a path that directly transmits data with I/O equipment, the efficient of CPU is greatly improved;
Step S405 judges whether these DMA data are the data that second serial receives: in this step, judge whether these DMA data are the data that second serial receives, if the result who judges is yes, be that the request of data transmit leg sends DMA interruption, execution in step S404 by second serial to the data receiver; Otherwise, execution in step S406;
Step S406 request of data finishes: the request of data that finishes this.
For the present embodiment, above-mentioned steps S404 particular flow sheet comprises step by step following as shown in Figure 4:
Step S404-1 detects the communications status of first serial, second serial, and judge whether to occur communication disruption: in this step, detect the communications status of first serial, second serial, and judge whether to occur communication disruption, if the result who judges is yes, be that data occur suddenly interrupting execution in step S404-2 in transmission course; Otherwise, execution in step S404-8;
Step S404-2 judges whether first serial is effective: in this step, judge whether first serial is effective, if the result who judges is yes, and execution in step S404-3; Otherwise, execution in step S404-5;
Step S404-3 writes first serial with these data, and sends the data response to the request of data transmit leg;
Step S404-4 judges whether the request of data transmit leg receives the data response in setting-up time: in this step, judge whether the request of data transmit leg receives the data response in setting-up time, if the result who judges is yes, illustrate that first serial is normal, continuation communicates by first serial, execution in step S404-3; Otherwise, execution in step S404-5;
Step S404-5 writes second serial with these data, and sends the data response to the request of data transmit leg;
Step S404-6 judges whether the request of data transmit leg receives the data response in setting-up time: in this step, judge whether the request of data transmit leg receives the data response in setting-up time, if the result who judges is yes, illustrate that second serial is normal, continuation communicates by second serial, execution in step S404-5; Otherwise, illustrate that first serial all can't communicate by letter with second serial, be that software stops execution in step S407;
The step S404-7 termination of communicating by letter: stop this communication;
Step S404-8 continues to receive the DMA data: continue to receive the DMA data.
In the middle of the process of the transmission of data, if a serial ports has broken down suddenly, the present invention can be transmitted by another serial ports that switches to that transfer of data is seamless: at first, in that whether will inquire about first this serial ports toward a certain serial ports when writing data effective, if invalid then directly send this request of data to another serial ports; If effectively, then send request of data to this serial ports, and increase a timer, if the data response is not received by data sending request side within the time of setting, show that the other side does not receive data, also directly send this request of data to an other serial ports this moment.
Certainly, in the middle of data transmission procedure, if serial communication interrupts suddenly, order to judge that or software stops serial ports and broken actually also can and send AT by method of the present invention: at first communicate by switching to the another one serial ports, if can communicate by letter, explanation is that the serial ports that communication disruption occurs has been broken, and software systems are normal; Some parameters that remove to inquire about bad serial ports by sending the AT order this moment again, which has partly damaged further to judge this serial ports; Can not communicate by letter if switch to the another one serial ports, explanation is that software stops, serial ports no problem (possibility that two serial ports of appearance damage simultaneously in the middle of practical application is very little, can ignore).
Fig. 5 is the schematic diagram of serial ports, wherein,
Data:
TXD: serial data output (Transmit Data)
RXD: serial data input (Receive Data)
Shake hands:
RTS: send request of data (Request to Send)
CTS: clear to send (Clear to Send)
DSR: data ready for sending (Data Send Ready)
DCD: data carrier detects (Data Carrier Detect)
DTR: data terminal ready (Data Terminal Ready)
Ground wire:
GND: ground wire
Other
RI: the tinkle of bells indication
As shown in Figure 6, described first serial or second serial are the MIPI interface, and described MIPI interface comprises data wire (MIPI_HSI_RX_DATA) and markings (MIPI_HSI_RX_FLG); Described data wire is used for the reception of data as RXD; Described markings are used for the transmission of data as TXD.
In the middle of practical application, when first serial carried out mass data (such as network data) transmission, can not in time respond the AT command request this moment, then can in time respond the AT command request by second serial.In addition, when first serial is carrying out mass data when transmission, by the state of second serial reported data transmission and the progress of transmission, the data length that namely prints by second serial just can judge whether the data of first serial reception are normal.According to using needs, the present invention can be applicable to first serial and is used for sending request, and second serial is used for response request, and this data service can be widely used in such as industrial information equipment such as PLC control, gate inhibition, medical treatment, measuring instrument, LED device for display of message.
Two serial ports of the present invention can carry out data communication simultaneously, and are separate, and the communication protocol of two serial ports is consistent, all supports RS232, and speed and the efficient of serial ports all is doubled, and also the utilization rate with CPU is doubled; And double serial port communication also improved the stability of communication greatly, when serial ports broken can be seamless another serial ports that switches to continue communication; Double serial port communication also helps to improve the testing efficiency of product in addition, has shortened the construction cycle of product.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the method that two serial ports are communicated by letter simultaneously is characterized in that, may further comprise the steps:
A) first serial, the second serial with a MCU is connected with first serial, the second serial of the 2nd MCU or peripheral hardware respectively;
B) when having data to send, the request of data transmit leg detects the operating state of first serial, second serial;
C) according to testing result, the request of data transmit leg sends request of data by free serial ports;
D) data receiver receives and processes the request of data of receiving.
2. method according to claim 1, it is characterized in that: described step C comprises step by step following:
C1) obtain the data of asking transmission;
C2) judge whether these data are write first serial, if, execution in step C3; Otherwise, execution in step C4;
C3) these data are write the buffer area corresponding with this serial ports;
C4) judge whether these data are write second serial, if, execution in step C3; Otherwise, execution in step C5;
C5) request of data finishes.
3. method according to claim 2, it is characterized in that: described step D comprises step by step following:
D1) detect first serial, second serial, when receiving that DMA interrupts, execution in step D2;
D2) read the DMA source address data of receiving;
D3) judge whether these DMA data are the data that first serial receives, if, execution in step D4; Otherwise, execution in step D5;
D4) receive also processes data requests;
D5) judge whether these DMA data are the data that second serial receives, if, execution in step D4; Otherwise, execution in step D6;
D6) request of data finishes.
4. method according to claim 3, it is characterized in that: described step D4 comprises step by step following:
D4-1) detect the communications status of first serial, second serial, and judge whether to occur communication disruption, if, execution in step D4-2; Otherwise, execution in step D4-8;
D4-2) judge whether first serial is effective, if, execution in step D4-3; Otherwise, execution in step D4-5;
D4-3) these data are write first serial, and send the data response to the request of data transmit leg;
D4-4) judge whether the request of data transmit leg receives the data response in setting-up time, if, execution in step D4-3; Otherwise, execution in step D4-5;
D4-5) these data are write second serial, and send the data response to the request of data transmit leg;
D4-6) judge whether the request of data transmit leg receives the data response in setting-up time, if, execution in step D4-5; Otherwise, execution in step D7;
D4-7) communication stops;
D4-8) continue to receive the DMA data.
5. the described method of arbitrary claim in 4 according to claim 1, it is characterized in that: described first serial or second serial are the MIPI interface, described MIPI interface comprises data wire and markings; Described data wire is used for the reception of data as RXD; Described markings are used for the transmission of data as TXD.
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| CN106528476A (en) * | 2016-11-24 | 2017-03-22 | 微鲸科技有限公司 | Circuit capable of automatically realizing cross and direct connection serial port switching |
| CN108985104A (en) * | 2018-07-20 | 2018-12-11 | 南昌黑鲨科技有限公司 | The encryption method and intelligent terminal of intelligent terminal |
| CN112737789A (en) * | 2020-12-23 | 2021-04-30 | 上海芯钛信息科技有限公司 | Method for realizing high-speed cryptographic operation of vehicle-mounted communication gateway based on two-way SPI (Serial peripheral interface) concurrency |
| CN115022163A (en) * | 2022-05-30 | 2022-09-06 | 深圳市遇贤微电子有限公司 | Log collection method and device, computer equipment and storage medium |
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Address after: 518000 No. 501, building A, two, science and technology building, 1057 Nanhai Road, Guangdong, Shenzhen Patentee after: FIBOCOM WIRELESS INC. Address before: 518000 No. 501, building A, two, science and technology building, 1057 Nanhai Road, Guangdong, Shenzhen Patentee before: Shenzhen G&T Industrial Development Co., Ltd. |