Subsys: USB DFU¶
1 功能概述¶
usb hid dfu sample演示了Zephyr USB DFU(Device Firmware Update)在PAN1080 SoC上的使用方法，主要包括：
结合
mcuboot为固件分配区域位置通过usb升级工具
dfu-util检测usb dfu device并为固件进行升级
2 环境准备¶
pan108xxb5_evb （LQFP封装、1MB Flash、64 Pin）
Type-C USB线两条
用于供电和查看串口打印Log
用于USB通信升级
硬件接线：
将EVB板上的P02，P03通过跳线帽与USB DM和USB DP相连
PC软件: 串口调试助手（UartAssist）或终端工具（SecureCRT），波特率921600
USB Host环境：
dfu-util运行在MAC OS环境下，相关环境搭建参考http://dfu-util.sourceforge.net/
3 编译和烧录¶
例程位置：zephyr\samples_panchip\subsys\usb\dfu
使用 ZAL 工具可以对其进行编译、烧录、打开 VS Code 调试等操作。关于 ZAL 工具的详细介绍请参考：Zephyr APP Launcher 工具介绍。
需要注意，编译后下载时需要将程序bin文件下载入固定程序区域，并烧录mcuboot
具体操作请参考04_dev_guides\zephyr_bootloader_guidance.md
4 演示说明¶
4.1 下载程序¶
参考04_dev_guides\zephyr_bootloader_guidance.md
以默认升级方式，下载
mcuboot程序将编译好的
dfu程序，通过imgtool处理，生成签名好的文件并下载入slot0_partition,复位确认mcuboot可以正常跳转至dfu程序参考
03_samples\basic\hello_world准备hello_world_with_boot作为待升级程序，通过imgtool进行操作，生成signed1.0.bin,大小为32k
python bootloader\mcuboot\scripts\imgtool.py sign --key bootloader\mcuboot\root-rsa-2048.pem --header-size 0x200 --align 8 --version 1.0 --slot-size 0x8000 --pad build\$(sample_name)\zephyr\zephyr.bin build\$(sample_name)\zephyr\signed1.0.bin
4.2 USB Host识别¶
参考http://dfu-util.sourceforge.net/
将运行的dfu程序板卡，通过usb与MAC电脑相连，在MAC的系统报告usb界面，正确识别到Zephyr DFU sample
MAC OS X操作系统下准备USB Host端的升级工具
Mac OS X users can also get dfu-util from Homebrew with “brew install dfu-util” or from MacPorts.
准备
Homebrew(mac os下载开源库工具)，下载按照以下命令在根目录按照bash（命令行）运行/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
通过
homebrew下载开源工具dfu-util，参考以下命令下载并配置brew install dfu-util export HOMEBREW_NO_INSTALL_CLEANUP=TRUE
通过
dfu-tool命令dfu-util -l查看usb dfu信息,log如下，usb dfu可以正常识别通信dfu-util 0.11 Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc. Copyright 2010-2021 Tormod Volden and Stefan Schmidt This program is Free Software and has ABSOLUTELY NO WARRANTY Please report bugs to http://sourceforge.net/p/dfu-util/tickets/ Found DFU: [2fe4:ffff] ver=0207, devnum=21, cfg=1, intf=0, path="20-3", alt=1, name="image-1", serial="0123456789ABCDEF" Found DFU: [2fe4:ffff] ver=0207, devnum=21, cfg=1, intf=0, path="20-3", alt=0, name="image-0", serial="0123456789ABCDEF"
4.3 DFU升级¶
以上环境正确运行后，将准备好的signed1.0.bin存在mac用户根目录，通过命令dfu-util --alt 1 --download signed1.0.bin运行，开始进行升级
升级进行并成功后，显示如下log
dfu-util 0.11
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2021 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
dfu-util: Warning: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release
Opening DFU capable USB device...
Device ID 2fe4:0005
Device DFU version 0110
Claiming USB DFU (Run-Time) Interface...
Setting Alternate Interface zero...
Determining device status...
DFU state(0) = appIDLE, status(0) = No error condition is present
Device really in Run-Time Mode, send DFU detach request...
Resetting USB...
Opening DFU USB Device...
Claiming USB DFU Interface...
Setting Alternate Interface #1 ...
Determining device status...
DFU state(2) = dfuIDLE, status(0) = No error condition is present
DFU mode device DFU version 0110
Device returned transfer size 64
Copying data from PC to DFU device
Download [=========================] 100% 32768 bytes
Download done.
4.4 LOG说明¶
为减少LOG对usb通信影响，USB DFU运行没有开启通信中的LOG，下载mcuboot运行后，LOG显示如下
*** Booting Zephyr OS build zephyr-v2.7.0-416-g5b5cf2f6d901 ***
I: Starting bootloader
I: Primary image: magic=good, swap_type=0x4, copy_done=0x1, image_ok=0x1
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Swap type: none
I: Bootloader chainload address offset: 0x10000
I: Jumping to the first image slot
*** Booting Zephyr OS build zephyr-v2.7.0-488-g22d426332c5f ***
USB DFU 在升级完成后，hello_world_with_boot程序存储在slot1_partition,以Swap type: test模式进行运行，第一次复位芯片，hello_world_with_boot程序运行
*** Booting Zephyr OS build zephyr-v2.7.0-416-g5b5cf2f6d901 ***
I: Starting bootloader
I: Primary image: magic=good, swap_type=0x4, copy_done=0x1, image_ok=0x1
I: Secondary image: magic=good, swap_type=0x2, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Swap type: test
I: Bootloader chainload address offset: 0x10000
I: Jumping to the first image slot
*** Booting Zephyr OS build zephyr-v2.7.0-472-g6a4336897fe6 ***
Hello World from Zephyr on pan108xxb5_evb with boot!
ih_magic 96f3b83d
ih_load_addr 0
ih_hdr_size 200
ih_protect_tlv_size 0
ih_img_size 3f6c
version 1.0.0.0
第二次复位芯片，芯片重新运行在dfu程序中
*** Booting Zephyr OS build zephyr-v2.7.0-416-g5b5cf2f6d901 ***
I: Starting bootloader
I: Primary image: magic=good, swap_type=0x2, copy_done=0x1, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Swap type: revert
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Bootloader chainload address offset: 0x10000
I: Jumping to the first image slot
*** Booting Zephyr OS build zephyr-v2.7.0-488-g22d426332c5f ***
5 开发说明¶
5.3 补充说明¶
dfu-util在window环境下运行有一定限制，所以需要通过Zadig安装libusbk驱动程序，可以正常识别，并且dfu-util可以正常检测到dfu dev，
libusb有以下限制
# This composite configuration may not work for Windows OS Host. # Windows OS does not send reset after DFU_DETACH request # (does not re-enumerates) and thus make it unable for the device # to restart in DFU mode.
mac os环境下dfu-util通信速率为64B/260ms，受限于主机发包速率，通信包效率通过逻辑分析仪抓包，约为1~2ms传输64BFIFO size：Endpoint0 64B（max）
Transfer Type：Control Transfer
one block传输通信：Get status—DFU download 64B—Get status
通过逻辑分析仪链接USB pin（P02—USB DM，P03—USB DP），可以抓取传输过程的一个USB download block数据交互流程如下
6 RAM/Flash资源使用情况¶
Memory region Used Size Region Size %age Used
FLASH: 31524 B 256 KB 12.03%
SRAM: 7024 B 64 KB 10.72%