Storage

Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.

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Camera
Servo Motor
Stepping Motor
Character LCD
SPI
I²C (Wire)
SD Card
SD (File Operations)
Periodic Operation
Clock (RTC)

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Overview
Storage
Wi-Fi
TLS (HTTPS)
Audio
Microphone
BLE

SD, USB as storage, using the Mbed OS file class.

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Save the photo in the storage, then read the saved photo and send it to USB0.

#include <Arduino.h>
#include <Camera.h>
#include <RTC.h>
#include <DisplayApp.h>
#include "SdUsbConnect.h"
    
#define IMAGE_HW 640
#define IMAGE_VW 480
    
Camera camera(IMAGE_HW, IMAGE_VW); // CMOS Camera
DisplayApp display_app;
SdUsbConnect storage("storage");
RTC rtc; // for time stamp
    
void setup() {
    Serial.begin(9600);
    pinMode(PIN_LED_RED, OUTPUT);
    pinMode(PIN_LED_GREEN, OUTPUT);
    pinMode(PIN_LED_YELLOW, OUTPUT);
    
    Serial.println("Test starts");
    
    // RTC
    rtc.begin();
    rtc.setDateTime(2017, 10, 14, 15, 40, 0);
    
    // Camera
    camera.begin();
    
    // SD & USB
    Serial.print("Finding strage..");
    storage.wait_connect();
    Serial.println("done");
    
}
    
void loop() {
    FILE * wp = fopen("/storage/lychee_camera.jpg", "w");
    if (wp != NULL) {
        digitalWrite(PIN_LED_YELLOW, HIGH);
        size_t size = camera.createJpeg();
        fwrite(camera.getJpegAdr(), sizeof(char), (int) size, wp);
        fclose(wp);
        digitalWrite(PIN_LED_YELLOW, LOW);
    } else {
        Serial.print("Not found jpg");
        digitalWrite(PIN_LED_RED, HIGH);
        delay(1);
    }
    
    FILE * fp = fopen("/storage/lychee_camera.jpg", "r");
    if (fp != NULL) {
        digitalWrite(PIN_LED_GREEN, HIGH);
        fseek(fp, 0, SEEK_END);
        uint32_t jpegSize = ftell(fp);
        fseek(fp, 0, SEEK_SET);
        uint8_t * buffer = (uint8_t*) malloc(jpegSize);
        for (uint32_t i = 0; i 	< jpegSize; i++) {
            buffer[i] = (uint8_t) fgetc(fp);
        }
        display_app.SendJpeg(buffer, jpegSize);
        fclose(fp);
        digitalWrite(PIN_LED_GREEN, LOW);
    } else {
        Serial.print("Not found jpg");
        digitalWrite(PIN_LED_RED, HIGH);
        delay(1);
    }
}
}