RV-LINK is a simulation-based firmware development board RISC-V, by programming RV-LINK firmware can be Sipeed Longan Nano development board into a jtagdebugger for debugging another piece Longan or other development support jtag debugging board. RV-LINK project address: https://gitee.com/zoomdy/RV-LINK

### Using the PlatformIO project to burn a key

• Open the project directory with VSCODE

Extract the source code downloaded above into a separate folder and open the source folder using VSCODE

As shown below:

The firmware is usually burned using the DFU method, and the configuration file does not need to be modified.

If you need to change the programming mode, you can modify platformio.ini to modify the file, please refer to the specific configuration:modify the project configuration file

• Burn firmware with PIO

After connecting the development board, after the development board enters the burning mode, click the arrow symbol in the lower left corner to burn.

After the programming is successful, you can see the green light flashing on the development board. After connecting the development board to the USB port of the computer, you can see that there is one more serial device in the device manager. At this point the Longan board successfully became the RV-LINK debugger.

### Other burning methods

Reference Document: Turning the Longan Nano Development Board into a RISC-V Emulator

### Connecting the development board

Connect the development board that brushes the RV-LINK firmware to the jtag of the development board to be debugged.

RV-LINK To be debugged development board
JTDO JTDO
JTDI JTDI
JTCK JTCK
JTMS JTMS
3V3 3V3
GND GND

RV-LINK in the PlatformIO IDE can support one-button boot debugging just like any other debugger.

Only in the project platformio.ini configuration file, specify the debug options and debug port option.

Sample code

[env:sipeed-longan-nano]
platform = gd32v
framework = gd32vf103-sdk
board = sipeed-longan-nano
monitor_speed = 115200
debug_port = COM2    ;  Required with rv-link Required debugger serial port