Momentum-Apps/firmware-update/save_picture.ino

#include "save_picture.h"

void save_picture() {
    sensor_t* cam = esp_camera_sensor_get();

    // Check if the sensor is valid.
    if (!cam) {
        Serial.println("Failed to acquire camera sensor");
        return;
    }

    // Set pixel format to JPEG for saving picture.
    cam->set_pixformat(cam, PIXFORMAT_JPEG);

    // Set frame size based on available PSRAM.
    if (psramFound()) {
        cam->set_framesize(cam, FRAMESIZE_UXGA);
    } else {
        cam->set_framesize(cam, FRAMESIZE_SVGA);
    }

    // Get a frame buffer from camera.
    camera_fb_t* frame_buffer = esp_camera_fb_get();
    if (!frame_buffer) {
        // Camera capture failed
        return;
    }

    if (!SD_MMC.begin()) {
        // SD Card Mount Failed.
        esp_camera_fb_return(frame_buffer);
        return;
    }

    // Generate a unique filename.
    String path = "/picture";
    path += String(millis());
    path += ".jpg";

    fs::FS& fs = SD_MMC;
    File file = fs.open(path.c_str(), FILE_WRITE);

    if (!file) {
        // Failed to open file in writing mode
    } else {
        if (file.write(frame_buffer->buf, frame_buffer->len) !=
            frame_buffer->len) {
            // Failed to write the image to the file
        }
        file.close(); // Close the file in any case.
    }

    // Update framesize back to the default.
    cam->set_framesize(cam, FRAMESIZE_QQVGA);

    // Return the frame buffer back to the camera driver.
    esp_camera_fb_return(frame_buffer);
}