ESP32-CAM 使用（二）

柔光的暖阳◎ 2021-11-01 11:06 492阅读 0赞

拿到这个板子之后，第一件事就是好奇这个板子还有几个引脚可以让我来使用？

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 1]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 3]

看看代码中定义了几个引脚：

#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

这里只定义了15个引脚。

## 视频质量： ##

const int resolution[][2] = { 
        {  160, 120 }, /* QQVGA */
        {  128, 160 }, /* QQVGA2*/
        {  176, 144 }, /* QCIF */
        {  240, 176 }, /* HQVGA */
        {  320, 240 }, /* QVGA */
        {  400, 296 }, /* CIF */
        {  640, 480 }, /* VGA */
        {  800, 600 }, /* SVGA */
        {  1024, 768 }, /* XGA */
        {  1280, 1024 }, /* SXGA */
        {  1600, 1200 }, /* UXGA */
        {  2048, 1536 }, /* QXGA */
    };

摄像头OV2640的资料：[https://wiki.ai-thinker.com/][https_wiki.ai-thinker.com]*media/esp32/docs/ov2640\_ds\_1.8*.pdf

使用最小的QQVGA（160\*120）–（2450Byte/25fps）大概100Byte每帧。

MJPG: 2449B 41ms (24.4fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0
    MJPG: 2456B 38ms (26.3fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0
    MJPG: 2451B 39ms (25.6fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0

使用最大的UXGA（1600\*1200）-- （84500Byte/4fps）大概21125Byte每帧。

MJPG: 84369B 351ms (2.8fps), AVG: 263ms (3.8fps), 0+0+0+0=0 0
    MJPG: 84407B 259ms (3.9fps), AVG: 272ms (3.7fps), 0+0+0+0=0 0
    MJPG: 84208B 247ms (4.0fps), AVG: 262ms (3.8fps), 0+0+0+0=0 0

效果图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 4]实现代码：

#include <WiFi.h>
    #include "esp_http_server.h"
    #include "esp_camera.h"
    #include "esp_timer.h"
    #include "dl_lib.h"
    
    const char* ssid = "liefyuan";
    const char* password = "1234567890";
    
    #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
    
    #define PART_BOUNDARY "123456789000000000000987654321"
    static const char* _STREAM_CONTENT_TYPE = "multipart/x-mixed-replace;boundary=" PART_BOUNDARY;
    static const char* _STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
    static const char* _STREAM_PART = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
    
    typedef struct { 
            size_t size; //number of values used for filtering
            size_t index; //current value index
            size_t count; //value count
            int sum;
            int * values; //array to be filled with values
    } ra_filter_t;
    
    httpd_handle_t stream_httpd = NULL;
    httpd_handle_t camera_httpd = NULL;
    static ra_filter_t ra_filter;
    
    static int ra_filter_run(ra_filter_t * filter, int value){ 
        if(!filter->values){ 
            return value;
        }
        filter->sum -= filter->values[filter->index];
        filter->values[filter->index] = value;
        filter->sum += filter->values[filter->index];
        filter->index++;
        filter->index = filter->index % filter->size;
        if (filter->count < filter->size) { 
            filter->count++;
        }
        return filter->sum / filter->count;
    }
    
    static esp_err_t stream_handler(httpd_req_t *req){ 
        camera_fb_t * fb = NULL;
        esp_err_t res = ESP_OK;
        size_t _jpg_buf_len = 0;
        uint8_t * _jpg_buf = NULL;
        char * part_buf[64];
        dl_matrix3du_t *image_matrix = NULL;
        bool detected = false;
        int face_id = 0;
        int64_t fr_start = 0;
        int64_t fr_ready = 0;
        int64_t fr_face = 0;
        int64_t fr_recognize = 0;
        int64_t fr_encode = 0;
    
        static int64_t last_frame = 0;
        if(!last_frame) { 
            last_frame = esp_timer_get_time();
        }
    
        res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE);
        if(res != ESP_OK){ 
            return res;
        }
    
        while(true){ 
            detected = false;
            face_id = 0;
    
            sensor_t * s = esp_camera_sensor_get();
            s->set_vflip(s, 1);
            
            fb = esp_camera_fb_get();
            if (!fb) { 
                Serial.println("Camera capture failed");
                res = ESP_FAIL;
            } else { 
                fr_start = esp_timer_get_time();
    
                _jpg_buf_len = fb->len;
                _jpg_buf = fb->buf; 
            }
            if(res == ESP_OK){ 
                size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, _jpg_buf_len);
                res = httpd_resp_send_chunk(req, (const char *)part_buf, hlen);
            }
            if(res == ESP_OK){ 
                res = httpd_resp_send_chunk(req, (const char *)_jpg_buf, _jpg_buf_len);
            }
            if(res == ESP_OK){ 
                res = httpd_resp_send_chunk(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));
            }
            if(fb){ 
                esp_camera_fb_return(fb);
                fb = NULL;
                _jpg_buf = NULL;
            } else if(_jpg_buf){ 
                free(_jpg_buf);
                _jpg_buf = NULL;
            }
            if(res != ESP_OK){ 
                break;
            }
            int64_t fr_end = esp_timer_get_time();
    
            int64_t ready_time = (fr_ready - fr_start)/1000;
            int64_t face_time = (fr_face - fr_ready)/1000;
            int64_t recognize_time = (fr_recognize - fr_face)/1000;
            int64_t encode_time = (fr_encode - fr_recognize)/1000;
            int64_t process_time = (fr_encode - fr_start)/1000;
            
            int64_t frame_time = fr_end - last_frame;
            last_frame = fr_end;
            frame_time /= 1000;
            uint32_t avg_frame_time = ra_filter_run(&ra_filter, frame_time);
            Serial.printf("MJPG: %uB %ums (%.1ffps), AVG: %ums (%.1ffps), %u+%u+%u+%u=%u %s%d\n",
                (uint32_t)(_jpg_buf_len),
                (uint32_t)frame_time, 1000.0 / (uint32_t)frame_time,
                avg_frame_time, 1000.0 / avg_frame_time,
                (uint32_t)ready_time, (uint32_t)face_time, (uint32_t)recognize_time, (uint32_t)encode_time, (uint32_t)process_time,
                (detected)?"DETECTED ":"", face_id
            );
        }
    
        last_frame = 0;
        return res;
    }
    
    void start_camera_server(void)
    { 
      httpd_config_t config = HTTPD_DEFAULT_CONFIG();
    
      httpd_uri_t    stream_uri = { 
        .uri         = "/stream",
        .method      = HTTP_GET,
        .handler     = stream_handler,
        .user_ctx    = NULL
      };
      
        config.server_port += 1;
        config.ctrl_port += 1;
        Serial.printf("Starting stream server on port: '%d'\n/stream", config.server_port);
        if (httpd_start(&stream_httpd, &config) == ESP_OK) { 
            httpd_register_uri_handler(stream_httpd, &stream_uri);
        }
    }
    
    
    void setup()
    { 
      Serial.begin(115200);
      Serial.setDebugOutput(true);
      Serial.println();
      
      camera_config_t config;
      config.ledc_channel = LEDC_CHANNEL_0;
      config.ledc_timer = LEDC_TIMER_0;
      config.pin_d0 = Y2_GPIO_NUM;
      config.pin_d1 = Y3_GPIO_NUM;
      config.pin_d2 = Y4_GPIO_NUM;
      config.pin_d3 = Y5_GPIO_NUM;
      config.pin_d4 = Y6_GPIO_NUM;
      config.pin_d5 = Y7_GPIO_NUM;
      config.pin_d6 = Y8_GPIO_NUM;
      config.pin_d7 = Y9_GPIO_NUM;
      config.pin_xclk = XCLK_GPIO_NUM;
      config.pin_pclk = PCLK_GPIO_NUM;
      config.pin_vsync = VSYNC_GPIO_NUM;
      config.pin_href = HREF_GPIO_NUM;
      config.pin_sscb_sda = SIOD_GPIO_NUM;
      config.pin_sscb_scl = SIOC_GPIO_NUM;
      config.pin_pwdn = PWDN_GPIO_NUM;
      config.pin_reset = RESET_GPIO_NUM;
      config.xclk_freq_hz = 20000000;
      config.pixel_format = PIXFORMAT_JPEG;
    
      if(psramFound()){ 
        config.frame_size = FRAMESIZE_UXGA;
        config.jpeg_quality = 10;
        config.fb_count = 2;
      } else { 
        config.frame_size = FRAMESIZE_SVGA;
        config.jpeg_quality = 12;
        config.fb_count = 1;
      }
    
      // camera init
      esp_err_t err = esp_camera_init(&config);
      if (err != ESP_OK) { 
        Serial.printf("Camera init failed with error 0x%x", err);
        return;
      }
    
      //drop down frame size for higher initial frame rate
      sensor_t * s = esp_camera_sensor_get();
      s->set_framesize(s, FRAMESIZE_QVGA);
    
      WiFi.begin(ssid, password);
      while (WiFi.status() != WL_CONNECTED) { 
        delay(500);
        Serial.print(".");
      }
      Serial.println("");
      Serial.println("WiFi connected");
    
      start_camera_server();
    
      Serial.print("Camera Ready! Use 'http://");
      Serial.print(WiFi.localIP());
      Serial.println("' to connect");
    }
    
    void loop()
    { 
      delay(10);
    }

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[https_wiki.ai-thinker.com]: https://wiki.ai-thinker.com/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 4]: /images/20211101/1a9ca3cdfc594aa295b4f07e31d65614.png