switch-examples/hid/read-controls/source/main.c

// Include the most common headers from the C standard library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Include the main libnx system header, for Switch development
#include <switch.h>

// See also libnx pad.h / hid.h.

// Main program entrypoint
int main(int argc, char* argv[])
{
    // This example uses a text console, as a simple way to output text to the screen.
    // If you want to write a software-rendered graphics application,
    //   take a look at the graphics/simplegfx example, which uses the libnx Framebuffer API instead.
    // If on the other hand you want to write an OpenGL based application,
    //   take a look at the graphics/opengl set of examples, which uses EGL instead.
    consoleInit(NULL);

    // Configure our supported input layout: a single player with standard controller styles
    padConfigureInput(1, HidNpadStyleSet_NpadStandard);

    // Initialize the default gamepad (which reads handheld mode inputs as well as the first connected controller)
    PadState pad;
    padInitializeDefault(&pad);

    //Matrix containing the name of each key. Useful for printing when a key is pressed
    char keysNames[28][32] = {
        "A", "B", "X", "Y",
        "StickL", "StickR", "L", "R",
        "ZL", "ZR", "Plus", "Minus",
        "Left", "Up", "Right", "Down",
        "StickLLeft", "StickLUp", "StickLRight", "StickLDown",
        "StickRLeft", "StickRUp", "StickRRight", "StickRDown",
        "LeftSL", "LeftSR", "RightSL", "RightSR",
    };

    u32 kDownOld = 0, kHeldOld = 0, kUpOld = 0; //In these variables there will be information about keys detected in the previous frame

    printf("\x1b[1;1HPress PLUS to exit.");
    printf("\x1b[2;1HLeft joystick position:");
    printf("\x1b[4;1HRight joystick position:");

    // Main loop
    while(appletMainLoop())
    {
        // Scan the gamepad. This should be done once for each frame
        padUpdate(&pad);

        // padGetButtonsDown returns the set of buttons that have been
        // newly pressed in this frame compared to the previous one
        u64 kDown = padGetButtonsDown(&pad);

        // padGetButtons returns the set of buttons that are currently pressed
        u64 kHeld = padGetButtons(&pad);

        // padGetButtonsUp returns the set of buttons that have been
        // newly released in this frame compared to the previous one
        u64 kUp = padGetButtonsUp(&pad);

        if (kDown & HidNpadButton_Plus)
            break; // break in order to return to hbmenu

        // Do the keys printing only if keys have changed
        if (kDown != kDownOld || kHeld != kHeldOld || kUp != kUpOld)
        {
            // Clear console
            consoleClear();

            // These two lines must be rewritten because we cleared the whole console
            printf("\x1b[1;1HPress PLUS to exit.");
            printf("\x1b[2;1HLeft stick position:");
            printf("\x1b[4;1HRight stick position:");

            printf("\x1b[6;1H"); //Move the cursor to the sixth row because on the previous ones we'll write the joysticks' position

            // Check if some of the keys are down, held or up
            int i;
            for (i = 0; i < 28; i++)
            {
                if (kDown & BIT(i)) printf("%s down\n", keysNames[i]);
                if (kHeld & BIT(i)) printf("%s held\n", keysNames[i]);
                if (kUp & BIT(i)) printf("%s up\n", keysNames[i]);
            }
        }

        // Set keys old values for the next frame
        kDownOld = kDown;
        kHeldOld = kHeld;
        kUpOld = kUp;

        // Read the sticks' position
        HidAnalogStickState analog_stick_l = padGetStickPos(&pad, 0);
        HidAnalogStickState analog_stick_r = padGetStickPos(&pad, 1);

        // Print the sticks' position
        printf("\x1b[3;1H%04d; %04d", analog_stick_l.x, analog_stick_l.y);
        printf("\x1b[5;1H%04d; %04d", analog_stick_r.x, analog_stick_r.y);

        // Update the console, sending a new frame to the display
        consoleUpdate(NULL);
    }

    // Deinitialize and clean up resources used by the console (important!)
    consoleExit(NULL);
    return 0;
}