[文章]

从0到1学习M5Stack系列教程（三）扫描WiFi网络

M5Stack

2019-8-22 17:25:58

3174

M5Stack支持wifi因此可以方便的连接到WiFi网络，本节介绍如何使用M5Stack扫描附近的WiFi网络，显示到屏幕上。

以下内容主要涉及到WiFi库的使用以及简单的屏幕菜单绘制。

#include
#include "WiFi.h"
#include
int n; //网络数量
int ssidLength = 10; //网络名称显示10个字符
int thisPage = 0; //首页标记
const int pageSize = 8; //每页显示网络数
bool on = false; //标记
bool leftLocked = false; //标记
bool rightLocked = false; //标记
void setup()
{
M5.begin();
WiFi.mode(WIFI_STA); //建立Station模式
WiFi.disconnect(); //断开所有连接
M5.Lcd.setBrightness(100); //屏幕亮度100
M5.Lcd.setTextSize(3); //设置字体
M5.Lcd.setCursor(45, 110);
M5.Lcd.printf("Wi-Fi scanner");
DrawMenu(); //绘制菜单
}
void LCD_Clear() { //清屏
M5.Lcd.fillScreen(BLACK);
M5.Lcd.setCursor(0, 0);
M5.Lcd.setTextColor(WHITE);
M5.Lcd.setTextSize(2);
}
void DrawMenu(){
M5.Lcd.setTextSize(3);
M5.Lcd.setTextColor(BLUE);
if (on == true) //判断开始扫描显示网络
{
M5.Lcd.setCursor(110, 215);
M5.Lcd.printf("RESCAN");
if (thisPage != 0) //如果当前页不是首页显示<
{
M5.Lcd.setCursor(60, 215);
M5.Lcd.printf("<");
leftLocked = false;
}
else //否则本页不显示“<”
{
leftLocked = true;
}
if (thisPage < ((n - 1) / pageSize)) //如果扫描到的网络数量超过页面大小（8）显示“>”
{
M5.Lcd.setCursor(250, 215);
M5.Lcd.printf(">");
rightLocked = false;
}
else
{
rightLocked = true; //否则不显示“>”
}
}
else //没有开启扫描显示“SCAN”
{
M5.Lcd.setCursor(128, 215);
M5.Lcd.printf("SCAN");
}
}
void Show(int nav = 0) // nav为-1左翻页
if (nav == -1)
{
if ((on == true) && (leftLocked == false))
{
thisPage--;
if (thisPage < 0) thisPage = 0;
Show();
}
}
else if (nav == 1) // nav为1右翻页
{
if ((on == true) && (rightLocked == false))
{
if ((thisPage) <= (n / pageSize)) thisPage++;
Show();
}
}
else
{
LCD_Clear();
M5.Lcd.setCursor(100, 2);
M5.Lcd.print("TOTAL: ");
M5.Lcd.print(n); //显示网络总数
M5.Lcd.setCursor(0, 30);
for (int i = (thisPage * pageSize); i < ((thisPage * pageSize) + pageSize); i++) //通过当前页面索引求出显示的序号
{
if (i >= n) break;
M5.Lcd.print(i + 1);
String ssid = (WiFi.SSID(i).length() > ssidLength) ? (WiFi.SSID(i).substring(0, ssidLength) + "...") : WiFi.SSID(i);
M5.Lcd.print(") " + ssid + " (" + WiFi.RSSI(i) + ");n");
}
DrawMenu();
}
}
void Search() { //扫描网络
on = true;
LCD_Clear();
M5.Lcd.setTextSize(3);
M5.Lcd.setCursor(50, 90);
M5.Lcd.printf("Please, wait.");
M5.Lcd.setCursor(50, 120);
M5.Lcd.printf("Searching...");
n = WiFi.scanNetworks();
Show();
}
void loop()
{
if (M5.BtnA.wasPressed()) Show(-1); //A键左翻页
if (M5.BtnB.wasPressed()) Search(); //B键搜索
if (M5.BtnC.wasPressed()) Show(1); //C键右翻页
M5.update();
}