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 MIT license, check LICENSE for more information
 Copyright (c) 2019 Ha Thach for Adafruit Industries
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*********************************************************************/

/* This sketch demonstrates USB Mass Storage and HID mouse (and CDC)
 * - Enumerated as 8KB flash disk
 * - Press button pin will move mouse toward bottom right of monitor
 */

#include "Adafruit_TinyUSB.h"

// 8KB is the smallest size that windows allow to mount
#define DISK_BLOCK_NUM  16
#define DISK_BLOCK_SIZE 512
#include "ramdisk.h"

// HID report descriptor using TinyUSB's template
// Single Report (no ID) descriptor
uint8_t const desc_hid_report[] =
{
  TUD_HID_REPORT_DESC_MOUSE()
};

Adafruit_USBD_HID usb_hid;
Adafruit_USBD_MSC usb_msc;

#if defined ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS
  const int pin = 4; // Left Button
  bool activeState = true;
#elif defined ARDUINO_NRF52840_FEATHER
  const int pin = 7; // UserSw
  bool activeState = false;
#else
  const int pin = 12;
  bool activeState = false;
#endif

// the setup function runs once when you press reset or power the board
void setup()
{
  // Set disk vendor id, product id and revision with string up to 8, 16, 4 characters respectively
  usb_msc.setID("Adafruit", "Mass Storage", "1.0");
  
  // Set disk size
  usb_msc.setCapacity(DISK_BLOCK_NUM, DISK_BLOCK_SIZE);

  // Set callback
  usb_msc.setReadWriteCallback(msc_read_cb, msc_write_cb, msc_flush_cb);

  // Set Lun ready (RAM disk is always ready)
  usb_msc.setUnitReady(true);
  
  usb_msc.begin();

  // Set up button
  pinMode(pin, activeState ? INPUT_PULLDOWN : INPUT_PULLUP);

  usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
  usb_hid.begin();

  Serial.begin(115200);
  while( !USBDevice.mounted() ) delay(1);   // wait for native usb

  Serial.println("Adafruit TinyUSB Mouse + Mass Storage (ramdisk) example");
}

void loop()
{
  // poll gpio once each 10 ms
  delay(10);

  // button is active low
  uint32_t const btn = (digitalRead(pin) == activeState);

  // Remote wakeup
  if ( USBDevice.suspended() && btn )
  {
    // Wake up host if we are in suspend mode
    // and REMOTE_WAKEUP feature is enabled by host
    tud_remote_wakeup();
  }

  /*------------- Mouse -------------*/
  if ( usb_hid.ready() )
  {
    if ( btn )
    {
      int8_t const delta = 5;
      usb_hid.mouseMove(0, delta, delta); // no ID: right + down

      // delay a bit before attempt to send keyboard report
      delay(10);
    }
  }
}

// Callback invoked when received READ10 command.
// Copy disk's data to buffer (up to bufsize) and 
// return number of copied bytes (must be multiple of block size) 
int32_t msc_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
{
  uint8_t const* addr = msc_disk[lba];
  memcpy(buffer, addr, bufsize);

  return bufsize;
}

// Callback invoked when received WRITE10 command.
// Process data in buffer to disk's storage and 
// return number of written bytes (must be multiple of block size)
int32_t msc_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
{
  uint8_t* addr = msc_disk[lba];
  memcpy(addr, buffer, bufsize);

  return bufsize;
}

// Callback invoked when WRITE10 command is completed (status received and accepted by host).
// used to flush any pending cache.
void msc_flush_cb (void)
{
  // nothing to do
}