CN103414620A

CN103414620A - Double-channel CAN simulation system based on CAN buses

Info

Publication number: CN103414620A
Application number: CN2013103547665A
Authority: CN
Inventors: 刘矗; 莫莽; 吴宝红
Original assignee: SHANGHAI GUTAI TECHNOLOGY Co Ltd
Current assignee: SHANGHAI GUTAI TECHNOLOGY Co Ltd
Priority date: 2013-08-15
Filing date: 2013-08-15
Publication date: 2013-11-27

Abstract

The invention relates to a double-channel CAN simulation system based on CAN buses. The double-channel CAN simulation system based on the CAN buses comprises a microcontroller, two CAN controllers and a USB module. The microcontroller is connected with the two CAN controllers, each CAN controller is connected to each CAN bus through a CAN transceiver, and each CAN transceiver can be replaced with a high-speed CAN, a low-speed CAN and a single-line CAN in a pluggable mode. Data transmission is carried out between the microcontroller and a PC machine through a USB bus, so CAN message transceiving based on the PC can be achieved. A simulation kernel operates on the PC and can simulate multiple CAN buses at the same time, a user can edit a code for a simulation CAN node on each virtual CAN bus, and thus each virtual CAN node can be communicated with a node on each real CAN bus connected with the virtual CAN node.

Description

A kind of analogue system of two-way CAN based on the CAN bus

Technical field

The present invention relates to a kind of electronic equipment, particularly a kind of analogue system based on the CAN bus.

Background technology

The CAN bus, as the communication interface between each microcontroller, has a wide range of applications in automobile and industry; In the development process of CAN bus, in order to verify the function of certain node, usually need to be by bus, mutual other nodes that do not have of node are by computer virtual out therewith, and communicate by letter together with real network, thereby to the properties of the tested node of abundant checking, and the performance of whole network.

Common way is to use USB to turn the interface card of CAN, and CAN bus and computer are coupled together, and on host computer, by USB interface, controls slave computer sending and receiving message, carries out emulation with the node on bus.The problem that such analogue system exists is: 1, a general system is only supported a CAN bus, supports bad to gateway and multichannel CAN bus; 2,, because transceiver is fixed, can not support simultaneously high-speed CAN, low speed CAN and single line CAN.

Summary of the invention

Purpose of the present invention, exactly in order to overcome multichannel CAN bus support issue and the scaling concern in CAN Bus simulator process, used the hardware of supporting two-way CAN, the method support that can replace by plug of the transceiver of each CAN interface simultaneously: high-speed CAN, low speed CAN and single line CAN.

Concrete technical scheme provided by the invention is as follows:

A kind of analogue system of two-way CAN based on the CAN bus, use microcontroller to be connected with two CAN controllers, each CAN controller is connected to respectively on the CAN bus, each CAN transceiver can replace with high-speed CAN, low speed CAN and single line CAN by pluggable mode, thereby microcontroller carries out by usb bus and PC the transmitting-receiving that transfer of data realizes the CAN message, on PC, carry out emulation, make each virtual emulation CAN node of PC that factum be arranged.

A kind of analogue system of two-way CAN based on the CAN bus, comprise hardware circuit, program of lower computer and host computer procedure.

A kind of analogue system of two-way CAN based on the CAN bus, described hardware circuit is comprised of microcontroller, two CAN controllers, USB modules; Microcontroller is connected with two CAN controllers, and each CAN controller connects a CAN transceiver, and each CAN transceiver all is connected to one independently on the CAN bus.

A kind of analogue system of two-way CAN based on the CAN bus, described CAN controller is after listening to CAN message or erroneous frame on bus, by the data feedback monitored to microcontroller, microcontroller reads in local message reception buffer zone by it, and the data in reception buffer zone are uploaded to PC by the USB module.

A kind of analogue system of two-way CAN based on the CAN bus, after described USB module receives the order of host computer, be configured microcontroller, comprises configuration of CAN bus parameter etc.

A kind of analogue system of two-way CAN based on the CAN bus, the dummy node in described host computer procedure artificial network, and by the USB driver, will need the message sent to pass to slave computer to send; By the USB driver, the message that slave computer receives is read and passes to dummy node simultaneously.

A kind of analogue system of two-way CAN based on the CAN bus, its advantage be, 1, reasonable in design, and clear in structure, can virtual any node, and node and node are complete independence, are independent of each other; 2, can support simultaneously two CAN buses to carry out while emulation, the gateway support function; 3 ,Mei road CAN buses are all supported high-speed CAN, low speed CAN and single line CAN.

The accompanying drawing explanation

Fig. 1 is total Organization Chart that in the invention process method, upper and lower computer connects

Fig. 2 is the actuating logic of hardware circuit in the invention process method

Fig. 3 is analogue system actuating logic in the invention process method

In Fig. 1, microcontroller (101), CAN controller (102), CAN transceiver block (103), CAN bus CANH(104), CAN bus CANL(105), USB module (106), PC (109), lower computer hardware circuit (110), USB line (111), power module (112), passage 1 sends indicator light (113), passage 1 codan lamp (114), the wrong indicator light of passage 1 (115), passage 2 sends indicator light (116), passage 2 codan lamps (117), the wrong indicator light of passage 2 (118), high-speed CAN transceiver daughter board (119), low speed CAN transceiver daughter board (120), single line CAN transceiver daughter board (121)

In Fig. 2, CAN controller reception buffer zone (201), the CAN controller sends buffering area (202), local CAN sends buffering area (203), local CAN reception buffer zone (204), testing engine (205), message USB sends buffering area (208), message USB reception buffer zone (209), computer CPU (211), CAN Bus simulator application program (212)

In Fig. 3, USB driver (301), USB reception buffer zone (302), USB sends buffering area (303), CAN Bus simulator program (304)

Embodiment

In Fig. 1, lower computer hardware circuit (110) comprises microcontroller (101), USB module (106) and CAN transceiver block (103), lower computer hardware circuit (110) is connected to PC (109) by USB cable (111), simultaneously by CAN bus CANH(104) and CANL(105) be connected to other nodes (112) on bus.

Microcontroller (101) connects at least one CAN controller (102), the TX pin of each CAN controller and RX pin are connected respectively TX pin and the RX pin of CAN transceiver block (103), the CANH of CAN transceiver is connected to CAN bus CANH(104), the CANL of CAN transceiver is connected to the CANL(105 of CAN bus).

Microcontroller (101), inner integrated CPU and internal memory, be connected with one or more independently CAN controllers; Or inner integrated one or more CAN controllers; What Fig. 1 showed is the situation of the inner integrated CAN controller of microcontroller (102).

CAN controller (102), as the protocol conversion chip of CAN bus, be responsible for the information such as the message on the CAN bus and erroneous frame are fed back to microcontroller, and each CAN controller has TX and the RX pin be connected with the CAN transceiver.

In Fig. 2, lower computer hardware circuit (110) is connected to PC (109) by USB cable (111), PC (109) comprises at least one central processing unit (211), PC (109) internal operation automated server application program (212) and at least one Automation Client application program (213).

Lower computer hardware circuit (110) is by connecting CAN bus CANH(104) and CAN bus CANL(105) communicate with other nodes.

The flow process that lower computer hardware circuit (110) receives from the message of CAN bus is, after the transceiver that its CAN controller (102) connects by CAN transceiver block (103) listens to the CAN message, by its buffer memory to inner CAN reception buffer zone (201), and notice microcontroller (101), microcontroller (101) is saved in message USB reception buffer zone (209) by the message that calls receiver function (204) and will receive, by USB module (106) by these data upload to PC (109).

The transmission flow of lower computer hardware circuit (110) is, slave computer microcontroller (101) sends buffering area (208) and reads the message data that will send from USB module (106) from message USB, by sending function (203), needs are sent to message on bus put into the CAN of CAN controller (102) and send buffering area again, via CAN controller (102), send to the CANH(104 of CAN bus by the transceiver of CAN transceiver block (103) connection) and CANL(105) on.

In Fig. 3, the CAN Bus simulator program (304) of host computer internal operation is connected to USB cable (111) by USB driver (301), thereby and sets up usb communication between lower computer hardware circuit (110).

Simulation flow in Fig. 3 is, the virtual two CAN buses of CAN Bus simulator program (304), and fictionalize the node that needs emulation on each virtual bus, USB transmission buffering area (303) is all put in sending request of the node of emulation, and be issued in lower computer hardware circuit (110) by USB driver (301), which by the virtual CAN network at simulation node place and the objective network of simulation node transmission, determine to send on the true CAN bus of root of slave computer; After when USB driver (301), having received the CAN message data of monitoring from slave computer, these data are deposited in USB reception buffer zone (302), CAN Bus simulator program (304) reads these data and sends it to each simulation node.

Claims

1. analogue system of the two-way CAN based on the CAN bus, it is by microcontroller, two CAN controllers and USB module form, it is characterized in that, microcontroller is connected with two CAN controllers, each CAN controller is connected to the CAN bus by the CAN transceiver respectively, each CAN transceiver can replace with high-speed CAN by pluggable mode, low speed CAN and single line CAN, thereby microcontroller carries out transfer of data by usb bus and PC realizes the CAN packet sending and receiving based on PC, on PC, move simulation kernel, simulation kernel is virtual many CAN buses simultaneously, the user can write code for the emulation CAN node on every virtual CAN bus, thereby make each virtual CAN node can with coupled real CAN bus on node communicate.

2. a kind of analogue system of two-way CAN based on the CAN bus according to claim 1, is characterized in that, system comprises hardware circuit, program of lower computer and host computer procedure.

3. a kind of analogue system of two-way CAN based on the CAN bus according to claim 2, is characterized in that, described hardware circuit is comprised of microcontroller, two CAN controllers, USB modules; Microcontroller is connected with two CAN controllers, and each CAN controller connects a CAN transceiver, and each CAN transceiver all is connected to one independently on the CAN bus.

4. a kind of analogue system of two-way CAN based on the CAN bus according to claim 3, it is characterized in that, described CAN controller is after listening to CAN message or erroneous frame on bus, by the data feedback monitored to microcontroller, microcontroller reads in local message reception buffer zone by it, and the data in reception buffer zone are uploaded to PC by the USB module.

5. a kind of analogue system of two-way CAN based on the CAN bus according to claim 4, is characterized in that, after described USB module receives the order of host computer, microcontroller is configured, and comprises configuration of CAN bus parameter etc.

6. a kind of analogue system of two-way CAN based on the CAN bus according to claim 2, the dummy node in described host computer procedure artificial network, and by the USB driver, will need the message sent to pass to slave computer to send; By the USB driver, the message that slave computer receives is read and passes to dummy node simultaneously.

7. a kind of analogue system of two-way CAN based on the CAN bus according to claim 6, is characterized in that, described each emulation CAN node has relevant code to write interface, by compiling, obtains executable code, and calls execution via simulation engine.

8. a kind of analogue system of two-way CAN based on the CAN bus according to claim 7, it is characterized in that, described each emulation CAN node can receive the bus message of uploading by USB interface, logic by the corresponding executable code of each node is to determine the reaction of emulation CAN node for the CAN event on bus, the message that needs simulation node to send will be transferred to USB interface and be issued to the lower computer hardware circuit by simulation kernel, and be dealt on bus via the CAN module of slave computer.