JTAG Hat for Raspberry Pi eases debugging with OpenOCD

JTAG Hat for Raspberry Pi

Low-level debugging can be performed with a JTAG debugger and OpenOCD open-source software, but since not everybody may have a JTAG debugger at home, some have reverted to using the Raspberry Pi as a JTAG debugger, and you’ll find instructions for cabling and installing the software on the Internet. Matt Mets of BlinkinLabs have been using the Raspberry Pi SBC and OpenOCD to debug Arm-based microcontroller boards for a while, but found it to be a pain to find jumper wires and look up the pin-outs manually each time. So he designed a JTAG Hat with properly labeled 20-pin .1″ and 1.27mm Cortex debug connectors to speed up the process. The expansion board also adds level-shifting buffers to interface with targets running at 1.8-5V, transistor-based power reset pins, a power switch for optionally supplying 3.3V to the target, a voltage/current sensor for measuring the target power consumption, and a buffered serial connection for communicating with the target using the Pi. […]

Some Interesting Talks from FOSDEM 2020 Schedule

FOSDEM 2020 Schedule

We wrote about IoT devroom call for proposals for FOSDEM 2020 a little while ago, and as the free open-source developer meetup is getting closer, FOSDEM 2020 organizers released the schedule. So I’ll look at some of the talks in the relevant devrooms such as the Internet of Things, hardware enablement, Embedded, Mobile and Automotive, as well as RISC-V and others to compose my own little virtual schedule for the 2-day event. Saturday, February 1 10:30 – 10:50 – How lowRISC made its Ibex RISC-V CPU core faster – Using open source tools to improve an open-source core – by Greg Chadwick Ibex implements RISC-V 32-bit I/E MC M-Mode, U-Mode, and PMP. It uses an in-order 2 stage pipe and is best suited for area and power-sensitive rather than high-performance applications. However, there is scope for meaningful performance gains without major impact to power or area. This talk describes work done at lowRISC to analyze and improve the performance of […]

Wio Lite RISC-V WiFi Board with ESP8266 Module Launches for $6.9

Wio Lite RISC-V

Released this summer, GigaDevice GD32V generated a lot of buzz, as a cheap general-purpose 32-bit RISC-V MCU, and soon after the $5 Longan Nano development board with LCD display and enclosure was launched to the market. However, many applications benefit or require some network connectivity with WiFi. Espressif Systems is a founding member of the RISC-V Foundation, so RISC-V WiSoCs (Wireless SoCs) are coming, but AFAIK none of those are available yet. In the meantime, Seeed Studio has launched Wio Lite RISC-V board which brings WiFi connectivity to GD32V MCU through an ESP8266 WiFi module. Wio Lite specifications: MCU – Gigadevice GD32VF103CBT6 RISC-V (rv32imac) microcontroller @ 108 MHz with 128KB Flash, 32KB SRAM Wireless Module – ESP8266 WiFi Wio Core with 802.11b/g/n/ WiFi 4 connectivity Storage – MicroSD card slot USB – 1x USB Type-C port for power and programming Expansion – I/O headers for GD32 MCU, I/O header for Wio core ESP8266 module Debugging – Unpopulated 6-pin JTAG header […]

DirtyJTAG Firmware Convert $2 STM32 “Bluepill” Boards or ST-Link V2 Clones into JTAG Adapters

DirtyJTAG is a JTAG adapter firmware for cheap STM32 boards like BluePill or equally inexpensive ST-Link V2 clones that was developed to create an  alternative to the cheap – but now obsolete – LPT Wiggler cables, and more expensive USB JTAG probes. You’ll find the source, and documentation on Github. First, you’ll need to flash the firmware using the DFU method or an SWD programmer (for ST-Link) or USB to TLL debug board (for STM32 dev boards), before making the connection to the target board as shown below (for Bluepill). STM32 JTAG PA0 TDI PA1 TDO PA2 TCK PA3 TMS PA4 TRST PA5 SRST You can then use mainline UrJTAG for your newly flashed JTAG adapter. If you prefer OpenOCD, it might eventually be possible to use Versaloon firmware instead on STM32 Bluepill board. Thanks to Zoobab for the tip. Jean-Luc Aufranc (CNXSoft)Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering […]

Getting Started with Pine64 PADI IoT Stamp – Part 2: Serial Console, GCC SDK, Flashing & Debugging Code

PADI IoT Stamp module powered by Realtek RTL8710AF ARM Cortex M3 WiFi SoC is a potential competitor to Espressif ESP8266 modules.  Pine64, the manufacturer of the module, sent me their kit with a $2 IoT stamp, a breakout board, a USB to TTL debug board and a J-Link debug board. In the first part of the review I’ve shown the hardware and how to assemble PADI IoT stamp kit. In the second part I’m going to write a tutorial / getting start guide showing how to control the board with AT commands, build the firmware with GCC SDK, and finally demonstrate how to flash and debug the firmware with the J-Link debugger. The Quick Start Guide indicates you need to connect the USB to TTL debug board to UART2 instead of UART1 as I did on the very similar B&T RTL-00 RTL8710AF module, and set connection settings to 38400 8N1. This did not work for me, and I had indeed […]

ARMADA 8040 Networking Community Board with a Quad Core ARM Cortex A72 SoC Coming Soon for $300 and Up

Developers interested in ARMv8 server or networking boards are starting to have more and more affordable choices. After AMD Opteron A1100 series based LeMaker Cello board, and Softiron Overdrive 1000 server, SolidRun is now working on ARMADA 8040 networking community board powered by Marvell ARMA8040 quad core Cortex A72 network processor. ARMADA 8040 networking board (mrvl8040) preliminary specifications: SoC – ARMADA 8040 (88F8040) quad core Cortex A72 processor @ up to 2.0 GHz with MoChi architecture System Memory – 4GB DDR4 DIMM by default Storage – 4x SATA 3.0 port + micro SD slot Connectivity – 1x Gigabit RJ45 port, 1x SFP SGMII @ 2.5Gbps, dual 10Gbps copper with auto switchover to dual SFP+ Expansion – 1x PCIe-x4 3.0 slot, Linaro 96Boards expansion slot exposing GPIO, UART, I2C and SPI, Marvell TDM module header USB – 1x USB 3.0 port, 2x micro USB ports Debugging – Console port (UART) over microUSB connector; 20-pin Connector for CPU JTAG debugger; OpenOCD debugger […]

STMicro Releases Linux based STM32 MCU Development Tools

Until a few years ago, most development tools for micro-controllers were only available for Windows, but as Linux gained popularity among developers and engineers, community of developers designed development tools running in Linux, but only a few companies are providing tools that run on Linux operating systems. The good news is that STMicro has just announced the release of STM32CubeMX configurator and System Workbench for STM32, for both Linux and Windows, with Mac OS supporting coming on Q2 2016. Developped by Ac6 embedded systems company, System Workbench for STM32 relies on Eclipse IDE, supports the ST-LINK/V2 debugging tool under Linux through an adapted version of the OpenOCD project, and can be used with various STMicro STM32 boards including Nucleo boards, Discovery kits, and other Evaluation boards. You can give it a try by visiting OpenSTM32 Community, but for some reasons they ask you to register before accessing the installation instructions. If you already have a recent Eclipse installed, and you […]

Beyond Debug Key Enables JTAG & UART Debugging, Supports OpenOCD

Beyond Semiconductor, a fabless semiconductor company based in Slovenia which develops their own 32-bit BA2x IP cores, has sent me one of their development tool, namely Beyond Debug Key supporting JTAG and UART interfaces either with BeyondStudio for the company’s BA2x processor, or the open source suite OpenOCD for other processors. Since I don’t have any Beyond Semi boards, I instead configured it, and quickly tried it with Atmel SAMA5D3 Xplained ARM Cortex A5 development board, and OpenOCD (Open On-Chip Debugger). The debug tool comes in the package above describing the key features of the kit: Performance Transfer rate in excess of 600 kB/s 30 MHz maximum JTAG clock Less than 20 μW power draw from target board Compatibility Fully compatible with Beyond BA2x processor family Access any 8-bit, 16-bit, 32-bit or 64-bit processors via JTAG Works with all JTAG compliant devices Software Support OpenOCD for access to a range of CPLD, FPGA, flash and processor devices BeyondStudio for graphical […]