void app_main(void)
{
    init();
    
    int button= BUTTON_NONE;
    char buf0[128];
    int scroll_pos;
    //GPIOD_OUTPUT_EN  |= 0x70;
    //GPIOD_OUTPUT_VAL |= 0x70;
    while(true){
        button = button_read_device();
        if (button == BUTTON_POWER){
            sleep(HZ);
            GPIOF_OUTPUT_VAL &=~ 0x20;
        }
        if ( GPIOD_INPUT_VAL & 0x20 )
        {
            GPIOD_OUTPUT_VAL &=~ 0x40;
            GPIOD_OUTPUT_VAL &=~ 0x80;
            udelay(50);
            scroll_pos = adc_scan(ADC_SCROLLPAD);
            //GPIOD_OUTPUT_VAL |= 0x40;
            snprintf(buf0, sizeof(buf0), "SCROLL: %2x",scroll_pos);
        }
        lcd_puts(0, 1, buf0);
        lcd_update();
    }
    
    //browse_root();
}