2837xd code generation - Supplement (1)

1 Code generation supplement

  GPIODATA Read , Need to use Memory Copy modular ：

  stay TI In the official manual ,GPIO Divided into A-F Six groups , The corresponding relationships of each group are as follows ：

port	Pin	remarks
PortA	GPIO0 ---- GPIO31
PortB	GPIO32---- GPIO63
PortC	GPIO64 ---- GPIO95
PortD	GPIO96 ---- GPIO127
PortE	GPIO128 ---- GPIO159
PortF	GPIO160 ---- GPIO168

  Because in Simulink The official does not provide reading pins DATA Interface , There is no TI Official structure operation mode . Therefore, you can only read by accessing registers , For example, to visit GPIO23 The data of , To look at first GPIO23 Belong to PortA, So you should visit GpioDataRegs.GPADAT.all register . So use Memory Copy The module accesses the corresponding address ：

  For judging data, you can use Bitwise The module performs operations . For example, the following figure implements detection GPIO23 The data is 0 when , Trigger sub module .Bitwise The mask of represents which bit to check , Here's the picture , On behalf of care 23 position （GPIO23）. Ruodi 23 If the bit is zero, output 0, if 1 The output 0x800000.

2 Matlab-Coder Code generation

First, write a m_functiong Code for ：

Then enter Matlab Coder APP：

Then choose the one just written m Script files ：

Just click Next：

Then define the input port （ data type ）：

Select script for test generation MEX Files can be easily used to verify the effect of code generation ：

Enter more settings ：

Set to TIc2000 Series of codes ：

Then generate the code ：

Next, add the generated code to the project for application ：

  In the above code generation , You can see that there is mian file . That is matlab Given usage examples . It can be used according to the above . Enter the generated code directory , It's important here h The file contains , If you can't, join first my_func Of c Document and h file . After the compilation , Prompt to add whatever is missing .

  Here are some file containment relationships , In the code I generated ,my_func.h Need header file my_func_types.h And rtwtypes.h.rtwtypes.h There are some macro definition files stored . So I can copy four files into the project in the code generation directory ：

Use here CodeBlocks Verify that it can run ：

The result is in line with m Code functions ：

3 Simulink Function Code generation

  Because computer systems are discrete control systems , Therefore, discrete modules must be used for code generation , Here is a simple example to describe ：

Create the following PI Discrete model of , Input and output are replaced by ports （ In the generated code, parameters are passed in ）：

  Set simulation step size and solver method ：

  Set the hardware accordingly , There are different processors , The number of operations that may be supported is different ：

Yes Code Generation Tab for related settings , Any version is installed in the system VS Unchecked Generate code only. If there is no installation, you must check ：

That generation tlc The principle of the document is not well understood , Similar to scripting language , Call resources to compile . So for the time being, use the official , Write it yourself when you have the ability .

Report tab ：

Comments Tabs are all related to comments , Setting can increase the readability of the program （ The default settings are used here ）：

Code Placement Tab selection Compact（ Compact type ）：

Then after application , Exit to Simulink Interface （2019 The following version is in Interface There was a Configure Model Function Make relevant settings ）,2019 The above versions separate this function （ Here is 2019 Version setting process ）：

1） Get into Embeded Coder Set it up

2） Click the lower left corner to generate the editing function , Here are three function initializations 、 Step operation 、 Terminate function , Main setup step function （ The other two are set by themselves ）：

3）step Function settings （ Click verify after setting , After successful verification ,Ctrl+B Generate code ）：

4） In the generated code , You can see step function ：

  Its name , The formal parameters are all in Simulink Parameters set in . But here is only function generation , It also needs to be 0.01 It can be used once every second . Add the corresponding header file and source file into the project to call the function ：

4 Quick test of the model

Simulink Workspace and Workspace Connect with each other , So when testing the model quickly , Can pass m Script to simulate . The main process is as follows ：

clear;
clc;

step_size=0.01;          // Simulation step setting 
time=0.5;				// Simulation time setting 

t=[0:step_size:time]';
u(:,1)=[ones(2,1);zeros(length(t)-2,1)];          // Given array ,t by Simulink Simulation time point ,u For input 

simout=sim(gcs,'SolverType','Fixed-step','Solver','ode3',...
   'FixedStep',num2str(step_size),'Stoptime',num2str(time),...
   'LoadExternalInput','on');                      //  Yes Simulik Of Configuration Parameters Set it up 

stairs(simout.tout,simout.yout{
    1}.Values.Data);    // Draw the result graph 

It can be seen that the script actually realizes , The command to open the external input function and set the step length, running time and other related parameters ：

But the biggest difference between script testing and actual testing is ： He will not change any settings of the model . It can also quickly give different inputs and operations and draw results .

Of course, this is just a simple application , Specifically simout Function parameters and other usages need to refer to the help document .