Design with Adafruit JTAG 2x10 to SWD 2x5 in Cirkit DesignerThe Adafruit JTAG 2x10 to SWD 2x5 adapter board is a compact and reliable solution designed to bridge the gap between JTAG and Serial Wire Debug (SWD) interfaces. This adapter is particularly useful for developers and engineers who need to debug or program microcontrollers and other ICs that support SWD, but only have access to JTAG tools. Common applications include firmware flashing, debugging embedded systems, and programming microcontrollers in development environments.
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit DesignerThe following tables provide the pinout configurations for the JTAG 2x10 connector and the corresponding SWD 2x5 connector.
| Pin # | Signal Name | Description |
|---|---|---|
| 1 | VREF | Target reference voltage |
| 2 | NC | No connection |
| 3 | nTRST | JTAG reset signal (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 | System reset signal |
| 16 | GND | Ground |
| 17-20 | NC | No connection |
| Pin # | Signal Name | Description |
|---|---|---|
| 1 | VREF | Target reference voltage |
| 2 | SWCLK | SWD clock signal |
| 3 | GND | Ground |
| 4 | SWDIO | SWD data I/O |
| 5 | GND | Ground |
| 6 | SWO | Serial Wire Output (optional) |
| 7-10 | NC | No connection |
Q: The target device is not responding to the debugger. What could be wrong? A: Ensure that all connections are secure and correctly oriented. Check that the target device is powered and that the reference voltage (VREF) is present on the adapter.
Q: I'm getting intermittent connection issues. What should I do? A: Inspect the adapter and the headers for any signs of damage or debris. Clean the contacts if necessary and ensure that the connection is firm.
Q: Can I use this adapter for devices that do not support SWD? A: No, this adapter is specifically designed to convert JTAG to SWD. It will not work with devices that do not support the SWD protocol.
For further assistance, contact Adafruit customer support or refer to the community forums for additional troubleshooting advice.
