ESP32-S3 接收DVP接口完整例程

### ESP32-S3 DVP接口接收完整示例代码 为了实现ESP32-S3通过DVP接口接收图像数据并处理，下面提供了一个完整的示例程序。此程序基于`esp32-camera`库来配置摄像头并通过HTTP服务器传输视频流。 #### 初始化摄像头设置 首先，在Arduino IDE环境中安装必要的库文件，并确保已经选择了正确的开发板型号（即ESP32-S3）。接着按照如下方式进行初始化： ```cpp #include "esp_camera.h" // Pin definition for the camera module (调整这些引脚以匹配实际硬件连接) #define PWDN_GPIO_NUM 32 #define RESET_GPIO_NUM -1 #define XCLK_GPIO_NUM 0 #define SIOD_GPIO_NUM 26 #define SIOC_GPIO_NUM 27 #define Y9_GPIO_NUM 35 #define Y8_GPIO_NUM 34 #define Y7_GPIO_NUM 39 #define Y6_GPIO_NUM 36 #define Y5_GPIO_NUM 21 #define Y4_GPIO_NUM 19 #define Y3_GPIO_NUM 18 #define Y2_GPIO_NUM 5 #define VSYNC_GPIO_NUM 25 #define HREF_GPIO_NUM 23 #define PCLK_GPIO_NUM 22 void setupCamera() { camera_config_t config; config.ledc_channel = LEDC_CHANNEL_0; config.ledc_timer = LEDC_TIMER_0; config.pin_dvp_data = {Y2_GPIO_NUM, Y3_GPIO_NUM, Y4_GPIO_NUM, Y5_GPIO_NUM, Y6_GPIO_NUM, Y7_GPIO_NUM, Y8_GPIO_NUM, Y9_GPIO_NUM}; config.pin_hsync = HREF_GPIO_NUM; config.pin_vsync = VSYNC_GPIO_NUM; config.pin_pclk = PCLK_GPIO_NUM; config.pin_xclk = XCLK_GPIO_NUM; config.pin_pwdn = PWDN_GPIO_NUM; config.pin_reset = RESET_GPIO_NUM; config.xclk_freq_hz = 20000000; config.pixel_format = PIXFORMAT_JPEG; // Initialize the camera using the configuration above. esp_err_t err = esp_camera_init(&config); if (err != ESP_OK) { Serial.printf("Camera init failed with error 0x%x", err); return; } } ``` 这段代码设置了相机模块的工作参数以及GPIO映射关系[^2]。 #### 创建Web服务器用于直播JPEG帧 接下来创建一个简单的Web服务器用来展示实时捕获到的画面： ```cpp #include <WiFi.h> #include <AsyncTCP.h> #include <ESPAsyncWebServer.h> const char* ssid = "YOUR_SSID"; const char* password = "YOUR_PASSWORD"; AsyncWebServer server(80); String getContentType(String filename){ if(filename.endsWith(".html")) return "text/html"; else if(filename.endsWith(".css")) return "text/css"; else if(filename.endsWith(".js")) return "application/javascript"; else if(filename.endsWith(".ico")) return "image/x-icon"; return "text/plain"; } void startStream(){ server.on("/capture", HTTP_GET, [](AsyncWebServerRequest *request){ request->send_P(200, "multipart/x-mixed-replace; boundary=frameboundary", "", processor); }); server.begin(); } void connectToWifi(){ WiFi.mode(WIFI_STA); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.print("Connected to "); Serial.println(ssid); Serial.print("IP address: "); Serial.println(WiFi.localIP()); } void streamProcessor(const String& var, AsyncWebServerRequest *request){ camera_fb_t * fb = NULL; fb = esp_camera_fb_get(); // Get frame buffer if(!fb) { request->client()->write("--frameboundary\r\n"); request->client()->printf("Content-Type: image/jpeg\r\n"); request->client()->printf("Content-Length:%u\r\n\r\n", 0); return; } size_t jpgSize = fb->len; uint8_t *jpgBuf = fb->buf; request->client()->write("--frameboundary\r\n"); request->client()-> printf("Content-Type: image/jpeg\r\n" "Content-Length:%zu\r\n\r\n", jpgSize); request->client()->write(jpgBuf, jpgSize); esp_camera_fb_return(fb); // Return frame buffer back into pool } ``` 上述代码片段实现了Wi-Fi连接功能，并建立起了一个异步Web服务端口监听来自客户端对于图片资源的请求。每当收到新的GET请求时就会调用一次处理器函数`streamProcessor()`从摄像头上获取最新的一帧画面作为响应返回给访问者[^3]。 最后一步是在主循环里加入这两个方法: ```cpp void setup() { Serial.begin(115200); setupCamera(); connectToWifi(); startStream(); } void loop() {} ``` 这样就可以让设备启动后自动完成网络接入、开启HTTP推流等一系列操作了。