Start a new topic

Nextion dont use Popcallback


I am using the example. IF the button is pressed why does it dont enter the popcallback funktion?

I have a serial print to test if he enter it.

As answer on the arduino serial Monitor i just get:

some random signs

recvRetCommandFinished ok

setup done


I have klicked send Component ID in the Nextion Editor

 * @example CompButton.ino
 * @par How to Use
 * This example shows that when the button component on the Nextion screen is released,
 * the text of this button will plus one every time.      
 * @author  Wu Pengfei (email:<>)
 * @date    2015/7/10
 * @updated 2016/12/25 bring HMI up to v0.32 to avoid too old issues
 * @convert by Patrick Martin, no other changes made
 * @copyright 
 * Copyright (C) 2014-2015 ITEAD Intelligent Systems Co., Ltd. \n
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.

#include "Nextion.h"
SoftwareSerial HMISerial(2, 3); // RX, TX

 * Declare a button object [page id:0,component id:1, component name: "b0"]. 
NexButton b0 = NexButton(0, 1, "b0");

char buffer[100] = {0};

 * Register a button object to the touch event list.  
NexTouch *nex_listen_list[] = 

 * Button component pop callback function. 
 * In this example,the button's text value will plus one every time when it is released. 
void b0PopCallback(void *ptr)
    uint16_t len;
    uint16_t number;
    NexButton *btn = (NexButton *)ptr;
    memset(buffer, 0, sizeof(buffer));

    /* Get the text value of button component [the value is string type]. */
    btn->getText(buffer, sizeof(buffer));
    number = atoi(buffer);
    number += 1;

    memset(buffer, 0, sizeof(buffer));
    itoa(number, buffer, 10);

    /* Set the text value of button component [the value is string type]. */

void setup(void)
    /* Set the baudrate which is for debug and communicate with Nextion screen. */

    /* Register the pop event callback function of the current button component. */
    b0.attachPop(b0PopCallback, &b0);
    dbSerialPrintln("setup done"); 

void loop(void)
     * When a pop or push event occured every time,
     * the corresponding component[right page id and component id] in touch event list will be asked.


Ok After i used b0.attachPush() it worked.  But this API isnt in the nextion wiki? where can find it i just find the API for the display itself

Login or Signup to post a comment