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usb: device_next: implement USB DFU class for the new device support
This new implementation is written from scratch and is not tied to the image manager and MCUboot. It allows the user to define their own backend and use a simple macro to instantiate an image. On the USB side this is represented by an interface. The number of possible images is configurable using the Kconfig option, and is a fairly inexpensive approach since it only changes the size of the pointer array. The number of images is only limited by the number of possible interfaces in a configuration. The class implementation does not support multiple instances, as there is no real use for it. However, it does provide two class instances, one for runtime mode and one for DFU mode. The switch from runtime to DFU mode can only be performed by the user application, i.e. the application receives a notification when the host wants to switch to DFU mode, and then the application can disable the runtime configuration and enable the DFU configuration. This implementation does not support switching to the DFU mode by bus reset issued by the host. Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
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‎doc/connectivity/usb/device_next/api/index.rst

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@@ -12,3 +12,4 @@ New USB device support APIs
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uac2_device.rst
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usbd_msc_device.rst
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usb_midi.rst
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usbd_dfu.rst

‎doc/connectivity/usb/device_next/api/usbd_dfu.rst

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.. _usbd_dfu:
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USB DFU device API
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##################
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USB DFU device specific API defined in :zephyr_file:`include/zephyr/usb/class/usbd_dfu.h`.
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API Reference
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*************
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.. doxygengroup:: usbd_dfu

‎include/zephyr/usb/class/usbd_dfu.h

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/*
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* Copyright (c) 2024 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief USB Device Firmware Upgrade (DFU) public header
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*
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* Header exposes API for registering DFU images.
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*/
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#ifndef ZEPHYR_INCLUDE_USB_CLASS_USBD_DFU_H
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#define ZEPHYR_INCLUDE_USB_CLASS_USBD_DFU_H
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#include <stdint.h>
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/* DFU Class Subclass */
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#define USB_DFU_SUBCLASS 0x01
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/* DFU Class runtime Protocol */
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#define USB_DFU_PROTOCOL_RUNTIME 0x01
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/* DFU Class DFU mode Protocol */
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#define USB_DFU_PROTOCOL_DFU 0x02
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/* DFU Class Specific Requests */
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#define USB_DFU_REQ_DETACH 0x00
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#define USB_DFU_REQ_DNLOAD 0x01
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#define USB_DFU_REQ_UPLOAD 0x02
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#define USB_DFU_REQ_GETSTATUS 0x03
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#define USB_DFU_REQ_CLRSTATUS 0x04
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#define USB_DFU_REQ_GETSTATE 0x05
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#define USB_DFU_REQ_ABORT 0x06
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/* Run-Time DFU Functional Descriptor */
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struct usb_dfu_descriptor {
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uint8_t bLength;
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uint8_t bDescriptorType;
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uint8_t bmAttributes;
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uint16_t wDetachTimeOut;
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uint16_t wTransferSize;
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uint16_t bcdDFUVersion;
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} __packed;
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/* DFU Functional Descriptor Type */
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#define USB_DESC_DFU_FUNCTIONAL 0x21
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/* DFU attributes DFU Functional Descriptor */
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#define USB_DFU_ATTR_WILL_DETACH BIT(3)
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#define USB_DFU_ATTR_MANIFESTATION_TOLERANT BIT(2)
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#define USB_DFU_ATTR_CAN_UPLOAD BIT(1)
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#define USB_DFU_ATTR_CAN_DNLOAD BIT(0)
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/* DFU Specification release */
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#define USB_DFU_VERSION 0x0110
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/* DFU device status */
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enum usb_dfu_status {
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ERR_OK = 0x00,
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ERR_TARGET = 0x01,
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ERR_FILE = 0x02,
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ERR_WRITE = 0x03,
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ERR_ERASE = 0x04,
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ERR_CHECK_ERASED = 0x05,
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ERR_PROG = 0x06,
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ERR_VERIFY = 0x07,
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ERR_ADDRESS = 0x08,
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ERR_NOTDONE = 0x09,
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ERR_FIRMWARE = 0x0A,
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ERR_VENDOR = 0x0B,
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ERR_USBR = 0x0C,
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ERR_POR = 0x0D,
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ERR_UNKNOWN = 0x0E,
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ERR_STALLEDPKT = 0x0F,
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};
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/* DFU device states */
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enum usb_dfu_state {
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APP_IDLE = 0,
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APP_DETACH = 1,
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DFU_IDLE = 2,
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DFU_DNLOAD_SYNC = 3,
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DFU_DNBUSY = 4,
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DFU_DNLOAD_IDLE = 5,
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DFU_MANIFEST_SYNC = 6,
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DFU_MANIFEST = 7,
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DFU_MANIFEST_WAIT_RST = 8,
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DFU_UPLOAD_IDLE = 9,
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DFU_ERROR = 10,
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DFU_STATE_MAX = 11,
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};
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struct usbd_dfu_image {
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const char *name;
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struct usb_if_descriptor *const if_desc;
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void *const priv;
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struct usbd_desc_node *const sd_nd;
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bool (*next_cb)(void *const priv,
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const enum usb_dfu_state state, const enum usb_dfu_state next);
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int (*read_cb)(void *const priv,
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const uint32_t block, const uint16_t size,
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uint8_t buf[static CONFIG_USBD_DFU_TRANSFER_SIZE]);
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int (*write_cb)(void *const priv,
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const uint32_t block, const uint16_t size,
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const uint8_t buf[static CONFIG_USBD_DFU_TRANSFER_SIZE]);
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};
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/**
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* @brief USB DFU device update API
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* @defgroup usbd_dfu USB DFU device update API
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* @ingroup usb
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* @{
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*/
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/**
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* @brief Define USB DFU image
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*
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* Use this macro to create USB DFU image
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*
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* The callbacks must be in form:
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*
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* @code{.c}
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* static int read(void *const priv, const uint32_t block, const uint16_t size,
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* uint8_t buf[static CONFIG_USBD_DFU_TRANSFER_SIZE])
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* {
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* int len;
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*
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* return len;
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* }
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*
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* static int write(void *const priv, const uint32_t block, const uint16_t size,
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* const uint8_t buf[static CONFIG_USBD_DFU_TRANSFER_SIZE])
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* {
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* return 0;
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* }
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*
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* static bool next(void *const priv,
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* const enum usb_dfu_state state, const enum usb_dfu_state next)
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* {
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* return true;
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* }
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* @endcode
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*
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* @param id Identifier by which the linker sorts registered images
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* @param iname Image name as used in interface descriptor
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* @param iread Image read callback
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* @param iwrite Image write callback
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* @param inext Notify/confirm next state
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*/
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#define USBD_DFU_DEFINE_IMG(id, iname, ipriv, iread, iwrite, inext) \
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static __noinit struct usb_if_descriptor usbd_dfu_iface_##id; \
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\
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USBD_DESC_STRING_DEFINE(usbd_dfu_str_##id, iname, USBD_DUT_STRING_INTERFACE); \
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\
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static const STRUCT_SECTION_ITERABLE(usbd_dfu_image, usbd_dfu_image_##id) = { \
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.name = iname, \
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.if_desc = &usbd_dfu_iface_##id, \
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.priv = ipriv, \
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.sd_nd = &usbd_dfu_str_##id, \
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.read_cb = iread, \
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.write_cb = iwrite, \
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.next_cb = inext, \
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}
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/**
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* @}
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*/
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#endif /* ZEPHYR_INCLUDE_USB_CLASS_USBD_DFU_H */

‎include/zephyr/usb/usbd_msg.h

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USBD_MSG_CDC_ACM_LINE_CODING,
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/** CDC ACM Line State update */
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USBD_MSG_CDC_ACM_CONTROL_LINE_STATE,
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/** USB DFU class detach request */
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USBD_MSG_DFU_APP_DETACH,
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/** USB DFU class download completed */
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USBD_MSG_DFU_DOWNLOAD_COMPLETED,
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/** Maximum number of message types */
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USBD_MSG_MAX_NUMBER,
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};
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"Stack error",
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"CDC ACM line coding",
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"CDC ACM control line state",
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"DFU detach request",
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"DFU download completed",
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};
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BUILD_ASSERT(ARRAY_SIZE(usbd_msg_type_list) == USBD_MSG_MAX_NUMBER,

‎subsys/usb/device_next/CMakeLists.txt

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class/usbd_hid_api.c
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)
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zephyr_library_sources_ifdef(
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CONFIG_USBD_DFU
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class/usbd_dfu.c
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)
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zephyr_linker_sources_ifdef(
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CONFIG_USBD_DFU
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SECTIONS class/usbd_dfu.ld
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)
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zephyr_linker_sources(DATA_SECTIONS usbd_data.ld)

‎subsys/usb/device_next/class/Kconfig

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rsource "Kconfig.uac2"
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rsource "Kconfig.hid"
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rsource "Kconfig.midi2"
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rsource "Kconfig.dfu"

‎subsys/usb/device_next/class/Kconfig.dfu

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# Copyright (c) 2024 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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menuconfig USBD_DFU
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bool "USB DFU Class support"
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help
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USB DFU Class support
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if USBD_DFU
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config USBD_DFU_NUMOF_IMAGES
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int "Number of possible DFU images"
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range 1 256
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default 4
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help
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Number of possible DFU images.
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config USBD_DFU_ENABLE_UPLOAD
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bool "Allow images to be uploaded to the host"
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default y
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help
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This option sets the bitCanUpload flag in the DFU attributes and
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allows images to be uploaded to the host.
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config USBD_DFU_MANIFESTATION_TOLERANT
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bool "Device is manifestation tolerant"
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default y
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help
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This option sets the bitManifestationTolerant flag in the DFU
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attributes and means that the device can communicate over USB after the
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manifestation phase.
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config USBD_DFU_TRANSFER_SIZE
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int "Maximum number of bytes the device can accept per transfer"
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default 512
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range 64 1024
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help
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This option sets the wTransferSize in the DFU functional descriptor.
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config USBD_DFU_POLLTIMEOUT
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int "bwPollTimeout value (in ms)"
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default 10
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range 0 1000
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help
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This option sets the bwPollTimeout field in DFU_GETSTATUS response.
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module = USBD_DFU
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module-str = usbd dfu
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source "subsys/logging/Kconfig.template.log_config"
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endif

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