nextion

lib/ITEADLIB_Arduino_Nextion-master/examples/CompButton/CompButton_v0_32.ino

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+/**
+ * @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:<pengfei.wu@itead.cc>)
+ * @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"
+
+/*
+ * 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[] = 
+{
+    &b0,
+    NULL
+};
+
+/*
+ * 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;
+    dbSerialPrintln("b0PopCallback");
+    dbSerialPrint("ptr=");
+    dbSerialPrintln((uint32_t)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]. */
+    btn->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 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.
+     */
+    nexLoop(nex_listen_list);
+}
+
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