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Desk Viking

This is an STM32F103 debug tool inspired by the Bus Pirate. The aim is to have something that's easier to extend (I hate the PIC ecosystem) and a bit beefier - e.g. by having a proper USB connection instead of a USB<->UART bridge.

At present the code presents the device via 2 USB ACM devices. The first is the CLI interface, the second provides debugging information during development. The longer term plan is to present 2 interfaces (or 3 when debug is enabled) with the additional interface being a UART bridge to one of the device UARTs.

User interface

The user interface is designed to be compatible (though not identical to) the Bus Pirate interface; primarily because I'm already familiar with that and it provides a good set of initial functionality.

Supported protocols

The protocols currently supported are:

  • 1-Wire
  • CCLib/Proxy (debugging/programming of Texas Instruments CCxxxx chips)
  • I2C

Building

desk-viking uses the lightweight Chopstx RT thread library. You'll need to get it as follows:

git clone https://salsa.debian.org/gnuk-team/chopstx/chopstx.git ../chopstx

Then configure the board you're using. My development is currently done using a Maple Mini, so I do:

ln -s ../chopstx/board/board-maple-mini.h board.h

If you're building on Debian you can get an appropriate cross compile via:

sudo apt install gcc-arm-none-eabi

After that you can build with a simple:

make

You'll get a build/desk-viking.bin file which can be flashed over a serial connection to the device's UART1 using stm32flash:

stm32flash -w build/desk-viking.bin -v /dev/ttyUSB0

Emulation mode

It's possible to compile desk-viking in "emulation" mode, where it is a standard Linux binary that can be connected to via USBIP. While this doesn't provide any emulation of a connected device it does allow testing of basic functionality. A VCD file is written with details of the various GPIO states, and this can be used with tools such as sigrok to verify operation is as expected.

To build in emulation mode, first link the Chopstx emulation header as the board file:

ln -s ../chopstx/board/board-gnu-linux.h board.h

Then compile:

make EMULATION=1

And run the resulting binary:

build/desk-viking

Then, as root, load the USBIP driver module (I found this didn't get auto-loaded):

modprobe vhci-hcd

And attach to the desk-viking exported device:

usbip attach -r 127.0.0.1 -b 1-1

When you're done you can detach the device cleanly with:

usbip detach -p 0

Once you've detached the desk-viking binary will exit and the VCD file will be written.

Pinouts

The pinout configuration can be configured in include/gpio.h. The default maps as follows:

Name STM32 GPIO Maple Mini pin
AUX PB8 18
CLK PB13 30
CS PB12 31
MISO PB14 29
MOSI PB15 28

These pins have been chosen as they map to SPI2, which should allow for the STM32 hardware SPI engine to be used for accelerating SPI access, rather than having to bitbang it.

TODO

This is a fledgling project and there is much to do.

Access methods

The intent is to implement various binary access methods that are not incompatible with each other, allowing the use of tools which already support those protocols to use the Desk Viking without modification. Primarily these are the Bus Pirate binary modes (BBIO, RAW, I2C + 1-Wire are already supported), but the CCLib CCProxy protocol is also implemented in a co-existing manner and it looks possible to implement the SUMP logical analyser protocol too.

Tool Protocol Status
AVRDUDE Bus Pirate binary SPI mode Planned
CCLib CCProxy Supported
flashrom Bus Pirate binary SPI mode Planned
OpenOCD (SWD) Bus Pirate Binary RAW mode Supported
OpenOCD (JTAG) Bus Pirate OpenOCD mode Planned
sigrok SUMP Planned

Protocols

  • CC.Debugger
  • JTAG/SWD
  • SPI

Author

License

This project is licensed under the GPL 3+ license, see COPYING for details.

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desk-viking's Issues

How it build?

Your project is very interesting, how to assemble it? And apply?

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