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}
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}
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void port_b_int_init() {
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void port_b_int_init() {
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    port_b_prev_state = 0x0F;
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    port_b_prev_state = 0x0F;
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    // Turn on internal pull-up for all port B pins
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    INTCON2bits.RBPU = 0;;
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    INTCON2bits.RBPU = 0;
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    // Set pins as inputs
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    // Set pins as inputs
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    TRISBbits.TRISB4 = 1;
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    TRISBbits.TRISB4 = 1;
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    TRISBbits.TRISB5 = 1;
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    TRISBbits.TRISB5 = 1;
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    TRISBbits.TRISB6 = 1;
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    TRISBbits.TRISB6 = 1;
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    TRISBbits.TRISB7 = 1;
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    TRISBbits.TRISB7 = 1;
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    // Turn on internal voltage pull-up
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    PORTBbits.RB4 = 1;
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    PORTBbits.RB5 = 1;
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    PORTBbits.RB6 = 1;
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    PORTBbits.RB7 = 1;
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    LATBbits.LATB4 = 0;
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    LATBbits.LATB4 = 1;
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    LATBbits.LATB5 = 0;
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    LATBbits.LATB5 = 1;
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    LATBbits.LATB6 = 0;
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    LATBbits.LATB6 = 1;
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    LATBbits.LATB7 = 0;
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    LATBbits.LATB7 = 1;
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    // Enable Port B interrupt
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    // Enable Port B interrupt
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    INTCONbits.RBIE = 1;
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    INTCONbits.RBIE = 1;
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}
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}
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