Wireless ESP8266 DAP

master develop

Introduce

Wireless debugging with only one ESP8266 !

Realized by USBIP and CMSIS-DAP protocol stack.

👉 5m distance, 100kb size firmware flash test:

Feature

1. Debug Communication Mode

   • SWJ
   • JTAG

2. USB Communication Mode

   • USB-HID
   • WCID & WinUSB

3. Debug Trace

   • UART Serial Wire Output(SWO)
   • SWO Streaming Trace

4. More..

   • Custom maximum debug clock(more than 10MHz)
   • ...

Link your board

1. WIFI

The default connected WIFI SSID is DAP , password 12345678

You can change WIFI_SSID and WIFI_PASS in wifi_configuration.h

2. Debugger

• SWD

SWD
SWCLK	GPIO5
SWDIO	GPIO4
LED_CONNECTED	GPIO2
LED_RUNNING	GPIO15
TVCC	3V3
GND	GND

• JTAG

JTAG
TCK	GPIO5
TMS	GPIO4
TDI	GPIO13
TDO	GPIO12
nTRST optional	GPIO0*
nRESET	GPIO14
LED_CONNECTED	GPIO2
LED_RUNNING	GPIO15
TVCC	3V3
GND	GND

You can modify these pin definitions in DAP_config.h

Tips: Try to avoid using GPIO0(working mode switch) and GPIO16(RTC)

Build

1. Get ESP8266 RTOS Software Development Kit

See: ESP8266_RTOS_SDK

2. Build & Flash

Build with ESP-IDF build system. More information can be found at the following link: Build System

The following example shows a possible way to build on Windows:

# Build
python ./idf.py build
# Flash
python ./idf.py -p /dev/ttyS5 flash

We also provided sample firmware quick evaluation. See Releases

Usage

1. Get USBIP project

• Windows: usbip-windows . Or you can find it already built here: https://github.com/barbalion/usbip-win-client
• Linux: Distributed as part of the kernel

2. Start esp8266 and connect it to the device to be debugged

3. Connect it with usbip:

.\usbip.exe -D -a <your-esp8266-ip-address>  1-1

If all goes well, you should see your device connected.

Develop

Credits to:

• https://github.com/thevoidnn/esp8266-wifi-cmsis-dap for adapter firmware based on CMSIS-DAP v1.0
• https://github.com/ARM-software/CMSIS_5 for CMSIS

In this repo you can find the complete implementation of the USB protocol stack including USB-HID, WCID, WinUSB. Although WinUSB-based mode currently does not work on USBIP 😥 . They are very easy and can help you quickly build your own DAP on other hardware platforms.

Currently using USB-HID for transmission is still slightly slower, If you have any ideas, welcome:

• New issues
• New pull

Issue

2-4

Due to the limitation of USB-HID (I'm not sure if this is a problem with USBIP or Windows), now each URB packet can only reach 255 bytes (About 1MBps bandwidth), which has not reached the upper limit of ESP8266 transmission bandwidth.

I now have an idea to construct a Man-in-the-middle between the two to forward traffic, thereby increasing the bandwidth of each transmission.

1-31

At present, the adaptation to WCID, WinUSB, etc. has all been completed. However, when transmitting data on the endpoint, we received an error message from USBIP. This is most likely a problem with the USBIP project itself.

Due to the completeness of the USBIP protocol document, we have not yet understood its role in the Bulk transmission process, which may also lead to errors in subsequent processes.

We will continue to try to make it work on USB HID. Once the USBIP problem is solved, we will immediately transfer it to work on WinUSB

License

MIT LICENSE