Wulin teaches you to learn PIC32 (Part 3) Teach you to use library functions to write interrupt buttons

The 32-bit microcontrollers I have come into contact with: STM32, LM3S all have library functions. Using library functions can speed up the project progress, and there is no need to check the registers at the bottom level, etc. The library function location of PIC32 is:

D:\Program Files\Microchip\MPLAB C32\pic32-libs\peripheral

If you install it on the C drive, just change the path. We can see that all the peripherals are packaged. There is a library function manual on the Internet. I can't download it due to poor network, so I will send the address to you:

http://hades.mech.northwestern.edu/images/5/5e/32-bit-Peripheral-Library-Guide.pdf

Next, we will teach you how to use the library function to make the interrupt button trigger the LED to turn on and off.

From the connection of the button, we can see that it does not have the function of input level CN. Fortunately, all the pins are brought out on the development board. We choose port 1 at the JB slot, which is PG9/CN11, as shown in the figure. Of course, other ports are also fine as long as they have the function of input level CN.

The programming steps are:

// Step 1: STEP 1. Configure the port direction

    PORTSetPinsDigitalOut(IOPORT_B,BIT_10);//LED1

    mPORTBClearBits(BIT_10);//LED1=0

    PORTSetPinsDigitalIn(IOPORT_G, BIT_9); //PG9 set input

    //Step 2: Set pin pull-up

    mCNOpen(CONFIG, PINS, PULLUPS);

   temp = mPORTGRead(); //Read to eliminate external influences

   //Step 3: Configure interrupts, enable interrupts, and set priorities

   ConfigIntCN(INTERRUPT);

  //Finally open the interrupt table

       INTEnableSystemMultiVectoredInt();