init
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#include <Arduino.h>
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#include <FS.h>
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#include <LittleFS.h>
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#include <SPI.h>
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#include <WiFi.h>
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#include <DNSServer.h>
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#define FS LittleFS
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// ================== WiFi AP 配置 ==================
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const char* AP_SSID = "AD7606_AP";
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const char* AP_PASS = "12345678";
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WiFiServer httpServer(80);
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WiFiClient streamClient;
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bool streamClientActive = false;
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// Captive Portal 用 DNS 服务器
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const byte DNS_PORT = 53;
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DNSServer dnsServer;
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// ================== AD7606 引脚配置（按实际改） ==================
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static const int PIN_AD_MISO = 8; // DB7 / DOUTA
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static const int PIN_AD_SCK = 11; // RD/SC
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static const int PIN_AD_CS = 12; // CS_N
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static const int PIN_AD_CONVSTA = 13; // CO-A
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static const int PIN_AD_CONVSTB = 13; // CO-B（与 CO-A 共用）
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static const int PIN_AD_RESET = 5; // REST
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static const int PIN_AD_BUSY = 14; // BUSY
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static const int PIN_AD_OS0 = 6; // OSI0
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static const int PIN_AD_OS1 = 7; // OSI1
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static const int PIN_AD_OS2 = 15; // OSI2
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// 如果 SER / STBY 直接焊到 3.3V，这两个 PIN 物理上可以不接
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static const int PIN_AD_SER = 3; // SER
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static const int PIN_AD_STBY = 4; // STBY
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SPIClass AD7606_SPI(FSPI);
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int16_t g_samples[8];
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// ================== AD7606 相关函数 ==================
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void AD7606_reset() {
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digitalWrite(PIN_AD_RESET, LOW);
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delayMicroseconds(2);
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digitalWrite(PIN_AD_RESET, HIGH);
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delayMicroseconds(2);
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digitalWrite(PIN_AD_RESET, LOW);
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}
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void AD7606_startConvst() {
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digitalWrite(PIN_AD_CONVSTA, LOW);
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digitalWrite(PIN_AD_CONVSTB, LOW);
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delayMicroseconds(1);
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digitalWrite(PIN_AD_CONVSTA, HIGH);
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digitalWrite(PIN_AD_CONVSTB, HIGH);
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delayMicroseconds(1);
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}
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void AD7606_readAll(int16_t* data) {
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// 1. 触发转换
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AD7606_startConvst();
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// 2. 等 BUSY 变低（BUSY 高 = 正在转换）
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while (digitalRead(PIN_AD_BUSY) == HIGH) {
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// 可选的小延时
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// delayMicroseconds(1);
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}
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// 3. SPI 连续读取 8 个 16-bit
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AD7606_SPI.beginTransaction(SPISettings(8000000, // 8MHz
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MSBFIRST, SPI_MODE0));
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digitalWrite(PIN_AD_CS, LOW);
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for (int i = 0; i < 8; ++i) {
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uint16_t raw = AD7606_SPI.transfer16(0x0000);
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data[i] = static_cast<int16_t>(raw);
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}
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digitalWrite(PIN_AD_CS, HIGH);
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AD7606_SPI.endTransaction();
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}
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float AD7606_codeToVolt(int16_t code, bool range10V) {
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float fullScale = range10V ? 10.0f : 5.0f;
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return (float)code * (fullScale / 32768.0f);
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}
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void AD7606_init() {
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pinMode(PIN_AD_CS, OUTPUT);
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pinMode(PIN_AD_SCK, OUTPUT);
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pinMode(PIN_AD_MISO, INPUT);
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pinMode(PIN_AD_CONVSTA, OUTPUT);
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pinMode(PIN_AD_CONVSTB, OUTPUT);
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pinMode(PIN_AD_RESET, OUTPUT);
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pinMode(PIN_AD_BUSY, INPUT);
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pinMode(PIN_AD_OS0, OUTPUT);
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pinMode(PIN_AD_OS1, OUTPUT);
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pinMode(PIN_AD_OS2, OUTPUT);
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pinMode(PIN_AD_SER, OUTPUT);
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pinMode(PIN_AD_STBY, OUTPUT);
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digitalWrite(PIN_AD_CS, HIGH);
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digitalWrite(PIN_AD_CONVSTA, HIGH);
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digitalWrite(PIN_AD_CONVSTB, HIGH);
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// 串行模式 & 正常工作（如果硬件已拉 3.3V，这两句只是保险）
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digitalWrite(PIN_AD_SER, HIGH); // SER=1 -> 串行
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digitalWrite(PIN_AD_STBY, HIGH); // STBY=1 -> 正常工作
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// 不过采样 OS[2:0] = 000
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digitalWrite(PIN_AD_OS0, LOW);
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digitalWrite(PIN_AD_OS1, LOW);
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digitalWrite(PIN_AD_OS2, LOW);
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AD7606_reset();
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delay(1);
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const int dummyMosi = 9; // MOSI 随便给个没用的脚
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AD7606_SPI.begin(PIN_AD_SCK, PIN_AD_MISO, dummyMosi, PIN_AD_CS);
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AD7606_startConvst();
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}
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// ================== HTTP + Captive Portal 部分 ==================
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// 返回 gzip 压缩的 index.html.gz
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void serveIndexHtml(WiFiClient& client) {
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File f = FS.open("/index.html.gz", "r");
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if (!f || f.isDirectory()) {
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client.print(
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"HTTP/1.1 500 Internal Server Error\r\n"
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"Content-Type: text/plain\r\n"
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"Connection: close\r\n"
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"\r\n"
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"index.html not found\r\n");
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client.stop();
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return;
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}
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client.print(
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: text/html; charset=utf-8\r\n"
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"Content-Encoding: gzip\r\n"
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"Connection: close\r\n"
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"Cache-Control: no-cache\r\n"
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"Access-Control-Allow-Origin: *\r\n"
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"\r\n");
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uint8_t buf[1024];
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while (true) {
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size_t n = f.read(buf, sizeof(buf));
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if (n == 0) break;
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client.write(buf, n);
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}
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f.close();
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client.stop();
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}
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// 发送 302 重定向到 /index.html（可选用）
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void redirectToPortal(WiFiClient& client) {
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client.print(
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"HTTP/1.1 302 Found\r\n"
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"Location: /index.html\r\n"
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"Connection: close\r\n"
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"Cache-Control: no-cache\r\n"
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"Access-Control-Allow-Origin: *\r\n"
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"\r\n");
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client.stop();
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}
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// 简易 HTTP 服务器 + Captive Portal 路由
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void acceptOrServeHttp() {
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// 1) 如果已有 stream 客户端，先检测是否掉线
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if (streamClientActive && !streamClient.connected()) {
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Serial.println("[HTTP] stream client disconnected");
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streamClient.stop();
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streamClientActive = false;
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}
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// 2) 接受新连接
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WiFiClient client = httpServer.available();
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if (!client) {
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return; // 没有新客户端
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}
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client.setTimeout(200); // 避免 readStringUntil 长时间阻塞 (ms)
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// 3) 读取首行
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String reqLine = client.readStringUntil('\r');
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client.readStringUntil('\n'); // 丢弃 \n
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if (reqLine.length() == 0) {
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client.stop();
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return;
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}
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// 4) 解析 path
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String path;
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int firstSpace = reqLine.indexOf(' ');
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int secondSpace = reqLine.indexOf(' ', firstSpace + 1);
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if (firstSpace >= 0 && secondSpace > firstSpace) {
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path = reqLine.substring(firstSpace + 1, secondSpace);
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}
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// 5) 丢弃其余 header（最多读取一定行数防御）
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for (int i = 0; i < 40 && client.connected(); ++i) {
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String line = client.readStringUntil('\n');
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if (line == "\r" || line.length() == 0) break;
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}
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// 6) 路由：
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// - /stream: 长连接输出采样
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// - 其他任意路径 -> Captive Portal 页面 (index.html)
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if (path == "/stream") {
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if (streamClientActive) {
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// 已经有一个 streaming，占用中
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client.print(
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"HTTP/1.1 409 Conflict\r\n"
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"Content-Type: text/plain\r\n"
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"Connection: close\r\n"
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"Cache-Control: no-cache\r\n"
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"Access-Control-Allow-Origin: *\r\n"
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"\r\n"
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"stream already active\r\n");
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client.stop();
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} else {
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client.print(
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"HTTP/1.1 200 OK\r\n"
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"Content-Type: text/plain\r\n"
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"Cache-Control: no-cache\r\n"
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"Connection: keep-alive\r\n"
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"Access-Control-Allow-Origin: *\r\n"
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"\r\n");
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streamClient = client; // 复制句柄，保持长连接
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streamClientActive = true;
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Serial.println("[HTTP] stream client connected /stream");
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// 不调用 stop()
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}
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} else {
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// 这里可以选择 serveIndexHtml 或 redirectToPortal
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// 为了简单，直接返回 index.html 内容
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serveIndexHtml(client);
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// 或者改成：
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// redirectToPortal(client);
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}
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}
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// 发送一帧 CH0 原始码值（只有一个数字 + '\n'）
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void sendRawSample(int16_t ch0_code) {
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if (!streamClientActive || !streamClient.connected()) {
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return;
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}
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streamClient.print(ch0_code);
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streamClient.print('\n');
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// 一般不用每次 flush，WiFi 底层会合包
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}
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// ================== Arduino 入口 ==================
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void setup() {
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Serial.begin(115200);
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delay(1000);
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Serial.println("Mounting LittleFS...");
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if (!FS.begin(true)) { // true = 如果挂载失败就尝试格式化
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Serial.println("LittleFS mount failed");
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} else {
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Serial.println("LittleFS mounted OK");
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}
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Serial.println("Init AD7606 (ESP32-S3 + SPI)...");
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AD7606_init();
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Serial.println("AD7606 init done.");
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// 启动 AP
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WiFi.mode(WIFI_AP);
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bool apOk = WiFi.softAP(AP_SSID, AP_PASS);
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if (apOk) {
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Serial.print("AP started, SSID: ");
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Serial.println(AP_SSID);
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Serial.print("AP IP: ");
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Serial.println(WiFi.softAPIP());
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} else {
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Serial.println("AP start FAILED");
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}
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// 启动 DNS Server：所有域名都解析到 AP IP
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IPAddress apIP = WiFi.softAPIP();
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dnsServer.start(DNS_PORT, "*", apIP);
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Serial.print("DNS server started on ");
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Serial.print(apIP);
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Serial.print(":");
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Serial.println(DNS_PORT);
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// 启动 HTTP Server
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httpServer.begin();
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Serial.println("HTTP server started on port 80");
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}
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void loop() {
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// 1. 先处理 DNS（Captive Portal 必须）
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dnsServer.processNextRequest();
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// 2. 处理 HTTP 连接
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acceptOrServeHttp();
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// 3. 采样一次
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AD7606_readAll(g_samples);
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// 4. 如果有客户端，就发一行 CH0 raw code
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sendRawSample(g_samples[0]);
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delay(1);
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}
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