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Input pins GPIO



I am trying to drive GPIO's 19 to 0, and trying to turn on the leds when a 3.3 voltage is applied in any of this pins, but it doesn't work


u32 btn, led;
    XGpio gpio;
    XGpio_Initialize(&gpio, 0);


    XGpio_SetDataDirection(&gpio, 2, 0x0); //output leds

    XGpio_SetDataDirection(&gpio, 1, 0xFFFFFFFF); //input pins

    print("Start test\n\r");


        btn = XGpio_DiscreteRead(&gpio, 1);

        putnum(btn); print("\n\r");

        if (btn!=0) // turn all LEDs on when a 3.3 voltage is applied in any input pin
            led = 0xFFFFFFFF;

            led = 0x00000000;

        XGpio_DiscreteWrite(&gpio, 2, led);


The leds are always on and the terminal always print 3FFF

I am using Arty7-35t, Vivado 2016.4.

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Please provide your block design, either as screenshots of the design pane and customization GUI for the AXI GPIO controller, or by attaching the TCL script created when you select File>Export>Export Block Design in the top tool bar of Vivado.



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