QT serial and CAN dynamic real-time display the log data

Foreword

From November 20th to December 10th, it took 20 days to write the host computer display program of QT serial port and CAN communication.After the whole project, I feel that I have a certain understanding of software, especially object-oriented programming, and also understand the difference between object-oriented programming and logic-oriented programming.Overall, the programming process is not very different: object-oriented programming also requires logic programming, and logic programming does not include object programming.As for the difference between serial port and CAN, it is only the difference between the underlying hardware. For upper-level programming, the difference is not very big.

Part 1: Object Programming and Logic Programming

(1) Language usage is not used: QT is based on c++, and single-chip microcomputer is based on C.The former is based on classes, while the latter uses structures at most.Relatively speaking, it is easy to get started with logic programming, and difficult to advance;

(2) The ideas are different: QT is based on signals and slots, real-time execution, and MCU is based on loops and interrupts.

(3) For different objects: QT only produces upper-level software, which belongs to peripheral equipment, that is, the sending or receiving end; the single-chip microcomputer is supported by hardware, and the peripheral can be a switch, a communication interface, or a peripheral display and signal produced by QT.Enter (communication).

(4) The logic is different: QT issues commands through the communication protocol, and the commands are realized by virtual buttons or logic.The microcontroller initializes the hardware interface, and its code is completed through a large loop + interrupt.

The location of the two is roughly as shown:

Part II: The difference between serial port and CAN in QT

(1) The source of the function is different: the function of the serial port in QT and the function of CAN require the dll file provided by the manufacturer.

(2) The effect of the receiving function is different: the serial port receiving function recvData = mSerial.readAll() puts the received data in the recvData array, the array is continuous, that is, if 100 are received, the data is placed in the array 0 to 99;CAN receive function ReceiveNum = VCI_Receive(nDeviceType,nDeviceInd,nCANInd,Receive,100,400) is placed in the Receive array, the array is only 8, no matter how many are received, it is placed in the array 0 to 7.

(3) Different effects: Excluding internal logic and peripheral logic problems, the reliability of serial port receiving data and drawing is lower than CAN receiving data and drawing.In the same case, serial port reception will lose points, but CAN reception will not (observe the waveform).In the case of a small number of plots, there is no obvious difference between the two.

The following figure shows the serial port receiving data and drawing:

The following picture shows CAN receiving data and drawing

Overall, there is no essential difference between the two in the dynamic real-time display of data, and only have their own characteristics in the underlying transmission and processing.

Part III: Summary

Data display: The upper software production of serial port and CAN has come to an end.The overall feeling is that it is not too difficult to just make a program that displays the interface, but it is more difficult to get started with the program.It is tentatively estimated that such projects will not be designed in a short period of time, and the code written will also be archived. If you need to use the serial port or CAN QT program, you can leave your own mailbox, and it will be packaged and sent.

Note: Since the time when the small partners need the source code is different, it is too troublesome to log in to the mailbox interface, so a subscription number has been established. If you have any questions or need the source code, you can add a subscription number. After leaving a message, the source code will be sent or anyQuestions can be left in the comments, and we will actively solve the problems raised.