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CompText_v0_32.ino

How to Use
  This example shows that ,when the "+" component on the Nextion screen is released, the value of text component will plus 1,when the "-" component released ,the value of text component will minus 1 every time.

Author
  Wu Pengfei (email:pengf.nosp@m.ei.w.nosp@m.u@ite.nosp@m.ad.c.nosp@m.c)

Date
  2015/7/10 2016/12/25 bring HMI up to v0.32 to avoid too old issues by Patrick Martin, no other changes made

Copyright
  Copyright (C) 2014-2015 ITEAD Intelligent Systems Co., Ltd.
  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"
void t0PopCallback(void *ptr);
void b0PopCallback(void *ptr);
void b1PopCallback(void *ptr);
/*
* Declare a text object [page id:0,component id:1, component name: "t0"].
*/
NexText t0 = NexText(0, 1, "t0");
/*
* Declare a button object [page id:0,component id:2, component name: "b0"].
*/
NexButton b0 = NexButton(0, 2, "b0");
/*
* Declare a button object [page id:0,component id:3, component name: "b1"].
*/
NexButton b1 = NexButton(0, 3, "b1");
char buffer[100] = {0};
/*
* Register object t0, b0, b1, to the touch event list.
*/
NexTouch *nex_listen_list[] =
{
&t0,
&b0,
&b1,
NULL
};
/*
* Text component pop callback function.
*/
void t0PopCallback(void *ptr)
{
dbSerialPrintln("t0PopCallback");
t0.setText("50");
}
/*
* Button0 component pop callback function.
* In this example,the value of the text component will plus one every time when button0 is released.
*/
void b0PopCallback(void *ptr)
{
uint16_t len;
uint16_t number;
dbSerialPrintln("b0PopCallback");
memset(buffer, 0, sizeof(buffer));
t0.getText(buffer, sizeof(buffer));
number = atoi(buffer);
number += 1;
memset(buffer, 0, sizeof(buffer));
itoa(number, buffer, 10);
t0.setText(buffer);
}
/*
* Button1 component pop callback function.
* In this example,the value of the text component will minus one every time when button1 is released.
*/
void b1PopCallback(void *ptr)
{
uint16_t len;
uint16_t number;
dbSerialPrintln("b1PopCallback");
memset(buffer, 0, sizeof(buffer));
t0.getText(buffer, sizeof(buffer));
number = atoi(buffer);
number -= 1;
memset(buffer, 0, sizeof(buffer));
itoa(number, buffer, 10);
t0.setText(buffer);
}
void setup(void)
{
/* Set the baudrate which is for debug and communicate with Nextion screen. */
nexInit();
/* Register the pop event callback function of the current text component. */
t0.attachPop(t0PopCallback);
/* Register the pop event callback function of the current button0 component. */
b0.attachPop(b0PopCallback);
/* Register the pop event callback function of the current button1 component. */
b1.attachPop(b1PopCallback);
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.
*/
nexLoop(nex_listen_list);
}