/**
 * @defgroup pkg_tinyusb TinyUSB package
 * @ingroup  pkg
 * @brief    Provides the tinyUSB stack as package
 * @author   Gunar Schorcht <gunar@schorcht.net>
 * @see https://github.com/hathach/tinyusb
 *
 * # TinyUSB
 *
 * tinyUSB is an open-source cross-platform USB Host/Device stack for
 * embedded systems.
 *
 * # Usage
 *
 * Add the following entries to your application makefile:
 * - Enable tinyUSB package
 *   ```makefile
 *   USEPKG += tinyusb
 *   ```
 * - Select whether to use the tinyUSB device stack or the tinyUSB host stack or both:
 *   ```makefile
 *   USEMODULE += tinyusb_device
 *   ```
 * - Select the device/host classes to be used, for example:
 *   ```makefile
 *   USEMODULE += tinyusb_class_cdc tinyusb_class_msc
 *   ```
 *
 * Add `tinyusb_setup()` to your main function to initialize the tinyUSB stack
 * including used peripherals and to start the tinyUSB thread.
 * ```c
 * int main(void)
 * {
 *     ...
 *     // initialize the tinyUSB stack including used peripherals and
 *     // start the tinyUSB thread
 *     tinyusb_setup();
 *
 *     while (1) {
 *         ...
 *     }
 *
 *     return 0;
 * }
 * ```
 *
 * Create a file `tusb_config.h` in your application directory which includes
 * at least the file `tinyusb_config.h` from the tinyUSB package. This file is
 * required by the tinyUSB stack and can be used to override the default
 * configuration defined in `tinyusb_config.h`.
 * ```c
 * #define CFG_TUD_CDC              2
 * #define CFG_TUD_CDC_EP_BUFSIZE   128
 *
 * #include "tinyusb_config.h"
 * ```
 *
 * Add the application path to the include paths at the end of your
 * application's Makefile. This is necessary so that the tinyUSB stack
 * uses the file `tusb_config.h` from your application directory and thus the
 * file `tinyusb_config.h` from the tinyUSB package.
 * ```makefile
 * USEPKG += tinyusb
 * USEMODULE += tinyusb_class_cdc
 * USEMODULE += tinyusb_class_msc
 * USEMODULE += tinyusb_device
 *
 * include $(RIOTBASE)/Makefile.include
 *
 * INCLUDES += -I$(APPDIR)
 * ```
 *
 * Implement required device descriptors and descriptor callbacks as well as
 * the callbacks of the enabled classes.
 *
 * Please refer `$RIOTBASE/tests/pkg_tinyusb_cdc_msc` and the
 * [tinyUSB documentation](https://docs.tinyusb.org/en/latest/reference/getting_started.html)
 * for details.
 */