Storage

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

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

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

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

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);
    }
}
}