2837xd code generation - Summary

  Code generation is a huge system , It took a long time to sort out the conditioning . This article will also focus on what was not mentioned before Simulink Coder Conduct actual measurement and explain usage .

1 Code generation

  The emergence of code generation technology is in recent years , Increasingly popular MBD（model basic design） It is an important part of birth and evolution . At present, more and more algorithms need to pass CAE Analyze , Then develop products . How to quickly design model Transforming into products has become one of the main directions for software engineers , If you can generate code directly from the model, you will reduce a lot of unnecessary human and material resources to the repeated development of the bottom .

2 Code generation process

  At this stage, code generation technology is mainly divided into stages ：1） Demand analysis 2） Model design 3） Simulation verification 4） Convert to product

  Demand analysis is not explained in detail here , It is not the focus of research at this stage .

  Model design is mainly based on demand modeling , Simulate and verify whether the algorithm meets the requirements .

  Simulation verification is mainly divided into SIL（ Software in the loop ）、PIL（ Processor in loop ）、HIL（ Hardware in the loop ） Three blocks are tested .

 1）SIL Mainly responsible for verifying model The simulation and generated code operation results are in PC Verify whether the results are consistent .

 2）PIL It refers to burning the generated code to the processor device （DSP、ARM etc. ）, Then the operation result is returned to PC End ,PC The end combines its operation result with model The simulation results are compared to check whether there is error .

 3）HIL Is to utilize more complex external hardware , Simulate the controlled object . Controller use DSP or ARM Burn the program . Observe whether the external hardware can achieve the desired effect . After this step is completed , It is proved that the designed controller can better complete the control task . The next step is to go to the physical platform for physical experiments .

3 A little supplement to code generation

  Detailed code generation has been groping forward in the previous article . Another piece of content is Simulink Provides the official library Simulink Coder Add your own written files for compatibility . On the one hand, it can provide functions that are not involved in some modules for code use , At the same time, compatibility has been verified c Language algorithms .

  Simulink Coder There is one in the library Custom Code, It contains several library files ：

Here is a table excerpted from an official document ： The official link

The main thing that I feel has practical effect is , The following test findings ：

1）System Initialize： Whether inside the module or on the top module System Initialize modular . It is only executed once in the system initialization function .

2）Model Source： Will be generated in .c Add the written code to the corresponding part of the document , Generally, it is the declaration and implementation of functions .

3）Model Header： Will be generated in .h Add the written code to the corresponding part of the document , Generally, it is the definition of function 、 Definition of data type .

4）System Updata And System Output： In the step function, each step will be executed ,Output The code segment in will precede Updata To perform . The function part of which module will be executed in which module .Ouput Of header and body Will add code at the beginning of the sub module , That is, execute before the module ,Output Of bottom Code will be added at the end of the sub module , That is, execute after executing the module . and Updata The module will execute all the sub module contents （ Include Output Of bottom completion of enforcement ） Separately header、body、bottom Code at .

5）System Start And System Enable： System Start Code will be added at the beginning of the initialization function , No matter where it is placed, it is only executed once .System Enable Add code at the end of the initialization function , No matter where it is placed, it is only executed once .