2837xd code generation module learning (1) -- GPIO module

  The above part mainly looks at the official routines , Have a framework understanding of program operation and the basic framework of the model , The next part is mainly about c2000 Each module in the library builds its own model based on its own understanding , Achieve the effect of learning module .
Model links ： Model links

1 Basic module

There is only one picture here , If you need to further study by yourself :

2 DSP Code generation library

2.1 GPIO_OUT

  from Library Enter the component page of the corresponding hardware （ This is 2837xd）, Have a look first GPIO output module . First configure the environment , The basic method is explained in the article of environment construction （ link ）, You need to add a check here .

After checking , Will make the generated variables exist in the form of structures .

GPIO out The parameter configuration is as follows ：

In the picture GPIO Group Used to select operations GPIO, Check the corresponding GPIO after . Access Constant（ by 1 Output high level , by 0 Output low level ）, Check Toggle It means to proceed with Solver Step size of .

2.2 GPIO_IN

GPIO_IN The module test here adopts , Configure in external mode （ That is what the previous article said SCI link ）. First configure according to the above article SCI_A.

GPIO_IN The parameter configuration is as above , Follow GPIO_OUT similar , No more details here .

GPIO_in The module is connected to the hardware KEY,GPIO_OUT The connection is LED. The phenomenon is when the key is pressed ,LED Light on , After loosening LED The light goes out .

2.3 GPIO_INT

GPIO Pin external interrupt test model :

The board I use GPIO_67 and GPIO_84 Two are connected respectively LED（ Low level on ）.

Let's look at it module by module first ：

1. External interrupt service module

here PIE_1.4 and PIE_1.5 These are external interrupts 1 And external interruptions 2 The interrupt function of .

2. Then use a Demux The module implements interrupts in two trigger functions ：

Trigger function at Library Medium simulink Under the subsystems below . Inside Function You can rename yourself , Under the GPIO_67 I also changed my name .

3. Inside the trigger function is an implementation GPIO Flipped module ：Counter Limited stay Simulink -> source Next , The function is to produce a 0 To Upper limit（ Parameters ） Number of cycles , here Upper Limit by 1, That is, every time the function is executed , Will be in 0-1 In between . So it's realized GPIO Flip of .

4. System initialization module ： The definition is implemented in the system initialization module GPIO66 and GPIO133 Input pin for external interrupt . The code added here will regenerate the program Initialize Function , Will only be executed once .

  // GPIO66 are input 
   EALLOW;                                                                       
   GpioCtrlRegs.GPCMUX1.bit.GPIO66 = 0;         // GPIO 
   GpioCtrlRegs.GPCDIR.bit.GPIO66 = 0;          // input 
   GpioCtrlRegs.GPCQSEL1.bit.GPIO66 = 0;        // XINT1 Synch to SYSCLKOUT only 
   EDIS;                                                                         
   EALLOW;                                                                       
   GpioCtrlRegs.GPEMUX1.bit.GPIO133 = 0;         // GPIO 
   GpioCtrlRegs.GPEDIR.bit.GPIO133 = 0;          // input 
   GpioCtrlRegs.GPEQSEL1.bit.GPIO133 = 0;        // XINT1 Synch to SYSCLKOUT only
   EDIS;                                                                         
// GPIO66 is XINT1 
   GPIO_SetupXINT1Gpio(66);//K1 GPIO66 
   GPIO_SetupXINT2Gpio(133);//K1 GPIO133 
// Configure XINT1 
   XintRegs.XINT1CR.bit.POLARITY = 0;      // Falling edge interrupt 
   XintRegs.XINT2CR.bit.POLARITY = 0;      // Falling edge interrupt 
// Enable XINT1 and XINT2 
   XintRegs.XINT1CR.bit.ENABLE = 1;        // Enable XINT1 
   XintRegs.XINT2CR.bit.ENABLE = 1;        // Enable XINT1 

Another way is to directly set the corresponding settings in the parameter list ( The effect of the two methods is exactly the same )：

Configuration Parameters -> Hardware Implementation -> Target hardware resources ->External interrupt

5. Program run results , Press the button ,LED Flip .