Tom's Life Bits

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To set a pin as output, you must disable the modes “Interrupt” “pull Up” and “pull Down”, which would be rather input modes. You must configure the mode as “output mode” and you must specify which pins these changes affect using pin_bit_mask

gpio_config_t io_conf;
    io_conf.intr_type = GPIO_PIN_INTR_DISABLE;//disable interrupt
    io_conf.mode = GPIO_MODE_OUTPUT;//set as output mode
    io_conf.pin_bit_mask = (1ULL<<18);//bit mask of the pins that you want to set,e.g.GPIO18
    io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;//disable pull-down mode
    io_conf.pull_up_en = GPIO_PULLUP_DISABLE;//disable pull-up mode
    esp_err_t error=gpio_config(&io_conf);//configure GPIO with the given settings
    if(error!=ESP_OK){
        printf("error configuring outputs \n");
    }

To set a pin as input, You must put the mode ( io_conf.mode )as input and select if you want the low level to be interpreted as active or inactive using pull_down_en

io_conf.intr_type = GPIO_PIN_INTR_DISABLE;//disable interrupt
io_conf.mode = GPIO_MODE_INPUT;//set as inputmode
io_conf.pin_bit_mask = (1ULL<<15);//bit mask of the pins that you want to set,e.g.GPIO15
io_conf.pull_down_en = GPIO_PULLDOWN_ENABLE;//enable pull-down mode
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;//disable pull-up mode
esp_err_t error=gpio_config(&io_conf);//configure GPIO with the given settings

if(error!=ESP_OK){
    printf("error configuring inputs\n");
}