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How to Use Adafruit JTAG 2x10 to SWD 2x5: Examples, Pinouts, and Specs

Image of Adafruit JTAG 2x10 to SWD 2x5
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Introduction

The Adafruit JTAG 2x10 to SWD 2x5 adapter (Part ID: 2094) is a compact and reliable connector adapter designed to convert a 2x10 JTAG interface to a 2x5 SWD (Serial Wire Debug) interface. This adapter is ideal for programming and debugging microcontrollers that utilize the SWD protocol. It simplifies the connection process by providing a seamless bridge between JTAG and SWD interfaces, making it an essential tool for embedded systems developers.

Explore Projects Built with Adafruit JTAG 2x10 to SWD 2x5

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Wi-Fi Enabled Sensor Hub with ESP8266 and ADS1115 ADC
Image of Node Mcu Gas Sensor: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
This circuit features two ESP8266 NodeMCU microcontrollers, each interfaced with a Gravity I2C ADS1115 16-Bit ADC module for analog-to-digital conversion. The microcontrollers communicate with the ADC modules via I2C protocol, with one set of connections for each microcontroller-ADC pair, and are powered through a common 3.3V and ground connection.
Cirkit Designer LogoOpen Project in Cirkit Designer
Wemos D1 Mini Based Soil Moisture and Temperature Monitoring System
Image of pfe2: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
This circuit features a Wemos D1 Mini microcontroller connected to an AHT10 temperature and humidity sensor and a capacitive soil moisture sensor. The AHT10 communicates with the Wemos D1 Mini via I2C (with SDA connected to D2 and SCL to D1), while the soil moisture sensor's analog output is connected to the A0 pin of the Wemos D1 Mini. Both sensors and the microcontroller share a common power supply, with the 3V3 pin of the Wemos D1 Mini providing power to the sensors.
Cirkit Designer LogoOpen Project in Cirkit Designer
Dual-Microcontroller Audio Processing System with Visual Indicators and Battery Management
Image of proto thesis 2: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
This is a portable audio-visual device featuring two Wemos microcontrollers for processing, Adafruit MAX4466 microphone amplifiers for audio input, and an LCD TFT screen for display. It includes power management with TP4056 modules and LiPo batteries, and user-controlled toggle and rocker switches.
Cirkit Designer LogoOpen Project in Cirkit Designer
Arduino UNO and HX711 Load Sensor Interface with Dual Axis Joystick and LED Indicators
Image of led joystick: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
This circuit is a dual-system setup featuring two Arduino UNOs. One system interfaces with an HX711 module and a load sensor to measure weight, while the other system uses a joystick module and multiple LEDs to create a user interface for visual feedback. Both systems include basic setup and loop code templates for further development.
Cirkit Designer LogoOpen Project in Cirkit Designer

Explore Projects Built with Adafruit JTAG 2x10 to SWD 2x5

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of Node Mcu Gas Sensor: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
Wi-Fi Enabled Sensor Hub with ESP8266 and ADS1115 ADC
This circuit features two ESP8266 NodeMCU microcontrollers, each interfaced with a Gravity I2C ADS1115 16-Bit ADC module for analog-to-digital conversion. The microcontrollers communicate with the ADC modules via I2C protocol, with one set of connections for each microcontroller-ADC pair, and are powered through a common 3.3V and ground connection.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of pfe2: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
Wemos D1 Mini Based Soil Moisture and Temperature Monitoring System
This circuit features a Wemos D1 Mini microcontroller connected to an AHT10 temperature and humidity sensor and a capacitive soil moisture sensor. The AHT10 communicates with the Wemos D1 Mini via I2C (with SDA connected to D2 and SCL to D1), while the soil moisture sensor's analog output is connected to the A0 pin of the Wemos D1 Mini. Both sensors and the microcontroller share a common power supply, with the 3V3 pin of the Wemos D1 Mini providing power to the sensors.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of proto thesis 2: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
Dual-Microcontroller Audio Processing System with Visual Indicators and Battery Management
This is a portable audio-visual device featuring two Wemos microcontrollers for processing, Adafruit MAX4466 microphone amplifiers for audio input, and an LCD TFT screen for display. It includes power management with TP4056 modules and LiPo batteries, and user-controlled toggle and rocker switches.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of led joystick: A project utilizing Adafruit JTAG 2x10 to SWD 2x5 in a practical application
Arduino UNO and HX711 Load Sensor Interface with Dual Axis Joystick and LED Indicators
This circuit is a dual-system setup featuring two Arduino UNOs. One system interfaces with an HX711 module and a load sensor to measure weight, while the other system uses a joystick module and multiple LEDs to create a user interface for visual feedback. Both systems include basic setup and loop code templates for further development.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Debugging and programming ARM Cortex-M microcontrollers using SWD.
  • Converting legacy JTAG interfaces to the modern SWD standard.
  • Prototyping and development of embedded systems.
  • Use in conjunction with SWD-compatible debuggers such as ST-Link, J-Link, or CMSIS-DAP.

Technical Specifications

The Adafruit JTAG 2x10 to SWD 2x5 adapter is designed to meet the needs of developers working with modern microcontrollers. Below are the key technical details:

Key Specifications

  • Manufacturer: Adafruit
  • Part ID: 2094
  • Input Interface: 2x10 JTAG (20-pin, 0.1" pitch)
  • Output Interface: 2x5 SWD (10-pin, 0.05" pitch)
  • Supported Protocols: SWD (Serial Wire Debug)
  • Dimensions: 1.0" x 0.6" (approx.)
  • Weight: ~2g
  • Material: PCB with gold-plated connectors for durability and reliable signal transmission.

Pin Configuration and Descriptions

2x10 JTAG Input Pinout

Pin Number Signal Name Description
1 VREF Target reference voltage
2 GND Ground
3 nTRST Test reset (optional)
4 GND Ground
5 TDI Test Data In
6 GND Ground
7 TMS Test Mode Select
8 GND Ground
9 TCK Test Clock
10 GND Ground
11 RTCK Return Test Clock (optional)
12 GND Ground
13 TDO Test Data Out
14 GND Ground
15 RESET Target reset
16 GND Ground
17 DBGRQ Debug Request (optional)
18 GND Ground
19 DBGACK Debug Acknowledge (optional)
20 GND Ground

2x5 SWD Output Pinout

Pin Number Signal Name Description
1 VREF Target reference voltage
2 SWDIO Serial Wire Debug I/O
3 GND Ground
4 SWCLK Serial Wire Clock
5 GND Ground
6 NC Not Connected
7 NC Not Connected
8 NC Not Connected
9 RESET Target reset
10 GND Ground

Usage Instructions

How to Use the Adapter in a Circuit

  1. Connect the JTAG Interface: Plug the 2x10 JTAG connector into the JTAG header of your debugger or development board.
  2. Connect the SWD Interface: Attach the 2x5 SWD connector to the SWD header of your target microcontroller or development board.
  3. Verify Connections: Ensure that the VREF, SWDIO, SWCLK, and RESET lines are properly aligned and connected.
  4. Power the Target Board: Provide power to the target microcontroller board. The adapter does not supply power; it relies on the target board's power supply.
  5. Begin Debugging or Programming: Use your preferred debugging tool (e.g., OpenOCD, J-Link software, or STM32CubeProgrammer) to program or debug the target microcontroller.

Important Considerations and Best Practices

  • Check Pin Alignment: Ensure that the pinout of the adapter matches the pinout of your target board. Misalignment can cause damage to the adapter or the target device.
  • Use Proper Tools: Use high-quality SWD and JTAG cables to ensure reliable signal transmission.
  • Avoid Excessive Force: When connecting or disconnecting the adapter, avoid applying excessive force to prevent damage to the connectors.
  • Verify Voltage Levels: Ensure that the target board's voltage levels are compatible with the adapter's VREF pin.

Example: Using with an Arduino-Compatible Board

If your target microcontroller supports SWD and you are using an Arduino-compatible board, you can use the adapter to debug or program the board. Below is an example of using OpenOCD with an SWD-compatible debugger:

OpenOCD command to connect to an SWD target

openocd -f interface/stlink.cfg -f target/stm32f1x.cfg

Replace 'stlink.cfg' with the configuration file for your debugger

and 'stm32f1x.cfg' with the configuration file for your target MCU.

Troubleshooting and FAQs

Common Issues Users Might Face

  1. No Connection to Target Board:

    • Cause: Incorrect pin alignment or loose connections.
    • Solution: Double-check the pin alignment and ensure all connections are secure.

  2. Debugger Not Recognized:

    • Cause: Missing or incorrect debugger drivers.
    • Solution: Install the correct drivers for your debugger (e.g., ST-Link, J-Link).

  3. Target MCU Not Responding:

    • Cause: Target board not powered or incorrect voltage levels.
    • Solution: Verify that the target board is powered and the VREF pin is receiving the correct voltage.

  4. Intermittent Debugging Issues:

    • Cause: Poor-quality cables or electrical noise.
    • Solution: Use shielded cables and ensure a clean power supply to the target board.

FAQs

Q: Can this adapter be used with all JTAG and SWD devices?
A: The adapter is designed for standard 2x10 JTAG and 2x5 SWD pinouts. Ensure that your devices follow these standards before use.

Q: Does the adapter provide power to the target board?
A: No, the adapter does not supply power. The target board must be powered separately.

Q: Can I use this adapter with non-ARM microcontrollers?
A: The adapter is primarily designed for ARM Cortex-M microcontrollers using the SWD protocol. Compatibility with non-ARM devices depends on their support for SWD.

Q: Is this adapter compatible with 1.8V systems?
A: Yes, as long as the VREF pin is correctly connected to the target board's reference voltage.

By following this documentation, you can effectively use the Adafruit JTAG 2x10 to SWD 2x5 adapter for your debugging and programming needs.