2 layers37 × 19 mm
Passive rpi hub75-adapter
hzeller/rpi-rgb-led-matrix
Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
2 parts4.4kGPL-2.0
2 layers
AdapterBoard
AntonKrug/akJtagPlusPlusC++ experiments around JTAGs
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 2
- Nets
- 121
- Pads
- 142
- Tracks, vias
- 56, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 May 2021
- Updated
- 8 Sep 2021
Overview
AdapterBoard is an open-source printed circuit board by AntonKrug, from the AntonKrug/akJtagPlusPlus repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board with 2 parts on 121 nets, routed with 56 tracks and 0 vias.
It belongs with the interfaces and adapters boards and the STM32 boards of this library.
README
README.mdAK JTAG++
Experimental JTAG dongle implemented in C++
Allowing users to interact with JTAG enabled devices with USB, or in a standalone mode with LCD (and touch screen).
Limited to only minimalistic official (vanila) JTAG specification (no custom vendor commands) and 3.3V based devices. However it's possible to convert it to different voltages, or allow level conversion to range of voltages. And adding protocols/commands is possible as well if their specification is published.
Bit-banging
The JTAG signals are bitbanged in SW, but written in assembly to make sure that the duty cycle stays the way it's expected as C/C++ can produce fast code, but it wouldn't gurantee the timing of the signals. In my assembly the sampling of read signals is happening around 2/3 of the clock period.
Currently the TCK runs 10.5MHz and around 50% duty cycle. For example if I wanted to have 8MHz exactly, then I couldn't have exact 50% duty cycle, because 168MHz / 8MHz is 21 clocks per period and can't be split evenly to 50:50 and small deviation from 50% duty cycle is necesary for some TCK frequencies.
Build
Based upon STM32F429ZI-DISC1 devboard with small daughter board connected to it (schematics/board below). To build the binaries, the project needs to be imported to a STM32cubeIDE 1.6 workspace and built with a Ctrl + B.
Daughter board schematics and PCB
KiCad project files are located in the schematics folder.
Schematic
USB
Is implemented by using the STM32F429ZI-DISC1 USB port, PID:VID has to be determined yet. The class of device is HID, with fairly small report size (32bytes) and no extra drivers are necesary (bundled drivers with the OS are fine) and application can use HID RAW APIs to interact with the device directly.
PCB
References
https://en.wikipedia.org/wiki/Joint_Test_Action_Group
https://en.wikipedia.org/wiki/JTAG
http://openocd.org/doc/html/Reset-Configuration.html
Parts
2| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | Conn_ARM_JTAG_SWD_10 | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | JTAG1 |
| 1 | STM32F429I-DISC1 | STM32F429I-DISC1:MODULE_STM32F429I-DISC1 | U1 |
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Questions
What parts does the AdapterBoard use?
2 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the AdapterBoard KiCad files?
From the AntonKrug/akJtagPlusPlus repository on GitHub, at the commit this page was made from: the board is schematics/adapterBoard/adapterBoard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the AdapterBoard design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).