switch-examples/hid/vibration/source/main.c

#include <string.h>
#include <stdio.h>

#include <switch.h>

//Example for HID vibration/rumble.

int main(int argc, char **argv)
{
    u32 VibrationDeviceHandles[2];
    Result rc = 0, rc2 = 0;

    HidVibrationValue VibrationValue;
    HidVibrationValue VibrationValue_stop;

    gfxInitDefault();
    consoleInit(NULL);

    printf("Press PLUS to exit.\n");

    //Two VibrationDeviceHandles are returned: first one for left-joycon, second one for right-joycon.
    rc = hidInitializeVibrationDevices(VibrationDeviceHandles, 2, CONTROLLER_PLAYER_1, LAYOUT_DEFAULT);
    printf("hidInitializeVibrationDevice() returned: 0x%x\n", rc);

    if (R_SUCCEEDED(rc)) printf("Hold R to vibrate, and press A/B/X/Y to adjust values.\n");

    VibrationValue.amp_low   = 0.2f;
    VibrationValue.freq_low  = 10.0f;
    VibrationValue.amp_high  = 0.2f;
    VibrationValue.freq_high = 10.0f;

    memset(&VibrationValue_stop, 0, sizeof(HidVibrationValue));
    // Switch like stop behavior with muted band channels and frequencies set to default.
    VibrationValue_stop.freq_low  = 160.0f;
        VibrationValue_stop.freq_high = 320.0f;

    // Main loop
    while(appletMainLoop())
    {
        //Scan all the inputs. This should be done once for each frame
        hidScanInput();

        //hidKeysDown returns information about which buttons have been just pressed (and they weren't in the previous frame)
        u32 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
        u32 kHeld = hidKeysHeld(CONTROLLER_P1_AUTO);
        u32 kUp = hidKeysUp(CONTROLLER_P1_AUTO);

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

        if (R_SUCCEEDED(rc) && (kHeld & KEY_R))
        {
            //Calling hidSendVibrationValue is really only needed when sending a new VibrationValue.

            //left-joycon
            rc2 = hidSendVibrationValue(&VibrationDeviceHandles[0], &VibrationValue);
            if (R_FAILED(rc2)) printf("hidSendVibrationValue() returned: 0x%x\n", rc2);

            //right-joycon
            rc2 = hidSendVibrationValue(&VibrationDeviceHandles[1], &VibrationValue);
            if (R_FAILED(rc2)) printf("hidSendVibrationValue() returned: 0x%x\n", rc2);

            if (kDown & KEY_A) VibrationValue.amp_low   += 0.1f;
            if (kDown & KEY_B) VibrationValue.freq_low  += 5.0f;
            if (kDown & KEY_X) VibrationValue.amp_high  += 0.1f;
            if (kDown & KEY_Y) VibrationValue.freq_high += 12.0f;
        }
        else if(kUp & KEY_R)//Stop vibration.
        {
            rc2 = hidSendVibrationValue(&VibrationDeviceHandles[0], &VibrationValue_stop);
            if (R_FAILED(rc2)) printf("hidSendVibrationValue() for stop returned: 0x%x\n", rc2);

            rc2 = hidSendVibrationValue(&VibrationDeviceHandles[1], &VibrationValue_stop);
            if (R_FAILED(rc2)) printf("hidSendVibrationValue() for stop returned: 0x%x\n", rc2);
        }

        gfxFlushBuffers();
        gfxSwapBuffers();
        gfxWaitForVsync();
    }

    gfxExit();
    return 0;
}