ESP32-CAM | How To Use OV2640 Camera Without PSRAM

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ESP32-CAM | How to use OV2640 camera without PSRAM Other Hardware Storage April 23, 2022, 3:27pm 1

I have an ESP32-CAM and have been using it to run a camera web server, I have been thinking of making a smaller version of it for a project. I'm planning to exclude PSRAM from the circuit since I found out it was meant for higher quality frame size. So to test it out I proceed to remove the PSRAM and reconfigure the camera based on the CameraWebServer example.

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; }

So I thought using the no-psram configuration would be okay. But it turns out did not work, I don't know what went wrong, but I do know the codes work with PSRAM, I don't understand parts of the code myself since I only edited the webserver handlers. From the error produced by the code seems like it's not receiving camera frame buffer or something. I'd really appreciate if anyone could solve for this no-psram method.

#include "esp_camera.h" #include <WiFi.h> #include "esp_timer.h" #include "img_converters.h" #include "Arduino.h" #include "fb_gfx.h" #include "soc/soc.h" //disable brownout problems #include "soc/rtc_cntl_reg.h" //disable brownout problems #include "esp_http_server.h" const char* ssid = "mywifissid"; const char* password = "mywifipass"; const char index_html[] = R"rawliteral( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <script src="https://fornix-systems-hosting.web.app/face-api.min.js"></script> <title>Face Recognition</title> <style> body { margin: 0; padding: 0; width: 100vw; height: 100vh; display: flex; justify-content: center; align-items: center; flex-direction: column } canvas { position: absolute; top: 0; left: 0; } </style> </head> <body> <div style="position: relative;" id="container"> <img src="http://192.168.100.74:81" id="imageUpload" crossorigin='anonymous'> </div> </body> </html> <script> const imageUpload = document.getElementById('imageUpload') Promise.all([ faceapi.nets.faceRecognitionNet.loadFromUri('https://fornix-systems-hosting.web.app/models'), faceapi.nets.faceLandmark68Net.loadFromUri('https://fornix-systems-hosting.web.app/models'), faceapi.nets.ssdMobilenetv1.loadFromUri('https://fornix-systems-hosting.web.app/models') ]).then(start) async function start() { const labeledFaceDescriptors = await loadLabeledImages() const faceMatcher = new faceapi.FaceMatcher(labeledFaceDescriptors, 0.6) const canvas = faceapi.createCanvasFromMedia(imageUpload) document.getElementById("container").append(canvas) const displaySize = { width: imageUpload.width, height: imageUpload.height } faceapi.matchDimensions(canvas, displaySize) document.body.append('Loaded') setInterval(async () => { console.log("detection called") const detections = await faceapi.detectAllFaces(imageUpload).withFaceLandmarks().withFaceDescriptors() const resizedDetections = faceapi.resizeResults(detections, displaySize) const results = resizedDetections.map(d => faceMatcher.findBestMatch(d.descriptor)) canvas.getContext('2d').clearRect(0,0,canvas.width,canvas.height) results.forEach((result, i) => { const box = resizedDetections[i].detection.box const drawBox = new faceapi.draw.DrawBox(box, { label: result.toString() }) drawBox.draw(canvas) }) },100) } function loadLabeledImages() { const labels = ['Walter White', 'Syahrul Zahwan'] return Promise.all( labels.map(async label => { const descriptions = [] for (let i = 1; i <= 2; i++) { const img = await faceapi.fetchImage(`https://fornix-systems-hosting.web.app/subjects/${label}/${i}.jpg`) const detections = await faceapi.detectSingleFace(img).withFaceLandmarks().withFaceDescriptor() descriptions.push(detections.descriptor) } return new faceapi.LabeledFaceDescriptors(label, descriptions) }) ) } </script> )rawliteral"; #define PART_BOUNDARY "123456789000000000000987654321" #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 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"; httpd_handle_t camera_httpd = NULL; httpd_handle_t stream_httpd = NULL; static esp_err_t page_handler(httpd_req_t *req) { httpd_resp_set_type(req, "text/html"); //httpd_resp_set_hdr(req, "Connection", "keep-alive"); httpd_resp_send(req, index_html, sizeof(index_html)); return ESP_OK; } static esp_err_t stream_handler(httpd_req_t *req){ httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*"); 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]; res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE); if(res != ESP_OK){ return res; } while(true){ fb = esp_camera_fb_get(); if (!fb) { Serial.println("Camera capture failed"); res = ESP_FAIL; } else { if(fb->width > 400){ if(fb->format != PIXFORMAT_JPEG){ bool jpeg_converted = frame2jpg(fb, 80, &_jpg_buf, &_jpg_buf_len); esp_camera_fb_return(fb); fb = NULL; if(!jpeg_converted){ Serial.println("JPEG compression failed"); res = ESP_FAIL; } } else { _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; } //Serial.printf("MJPG: %uB\n",(uint32_t)(_jpg_buf_len)); } return res; } void startCameraServer(){ httpd_config_t config = HTTPD_DEFAULT_CONFIG(); config.server_port = 80; httpd_uri_t index_uri = { .uri = "/", .method = HTTP_GET, .handler = stream_handler, .user_ctx = NULL }; httpd_uri_t page_uri = { .uri = "/faceapi", .method = HTTP_GET, .handler = page_handler, .user_ctx = NULL }; Serial.printf("Starting web server on port: '%d'\n", config.server_port); if (httpd_start(&camera_httpd, &config) == ESP_OK) { httpd_register_uri_handler(camera_httpd, &page_uri); } // start stream using another webserver config.server_port += 1; config.ctrl_port += 1; Serial.printf("Starting web server on port: '%d'\n", config.server_port); if (httpd_start(&stream_httpd, &config) == ESP_OK) { httpd_register_uri_handler(stream_httpd, &index_uri); } } void setup() { WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detector tft.initR(INITR_MINI160x80); tft.invertDisplay(false); Serial.begin(115200); Serial.setDebugOutput(false); 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; config.frame_size = FRAMESIZE_VGA; 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; } // Wi-Fi connection WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); Serial.print("Camera Stream Ready! Go to: http://"); Serial.print(WiFi.localIP()); // Start streaming web server startCameraServer(); } void loop() { delay(1); }

Error from serial monitor:

E (1298) cam_hal: cam_dma_config(280): frame buffer malloc failed E (1298) cam_hal: cam_config(364): cam_dma_config failed E (1299) camera: Camera config failed with error 0xffffffff Camera init failed with error 0xffffffff April 23, 2022, 3:28pm 2

You may get an answer here, but you'll probably get a better answer in the ESP32 forum: ESP32 Forum - Index page

1 Like April 24, 2022, 3:09pm 3

Never mind, I found the solution by looking into the esp_camera.h library myself. Turns out there is a configuration variable for this. fb_location is a variable in the configuration struct that probably defaults to saving the frame buffers to PSRAM, CAMERA_FB_IN_PSRAM. It can be configured to save the frame buffers into the internal DRAM using CAMERA_FB_IN_DRAM. So in my configuration, I just add,

config.fb_location = CAMERA_FB_IN_DRAM;

1 Like April 24, 2022, 3:33pm 4

Thanks for updating this post with the answer

October 21, 2022, 3:33pm 5

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Tag » Arduino Ov2640.h