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README_NuLink2Pro.md

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Nu-Link2-Pro debugging and programming adapter

When using the software development tools above, you may need a USB adapter. Here, we introduce a new feature-rich Nu-Link2-Pro adapter to you.

An overview picture of software tools, adapters and targets

The firmware of the Nu-Link2-Pro adapter

All Nu-Link2-Pro firmware binary files can be found here

Users can reprogram Nu-Link2-Pro with another .bin file using the following instructions (Windows OS)

  1. Press the button on Nu-Link2-Pro and plug in the USB cable.
  2. The "Nu-Link2-Pro" disk will appear. (If you see the disk name as "NuMicro MCU", it will upgrade target the device firmware instead of Nu-Link2-Pro itself)
  3. Drag and drop the Nu-Link2-Pro firmware .bin file into the disk.
  4. Re-plug the USB cable and it's done.

More options for NuLink2FW (configuration file NU_CFG.TXT)

Warning: The meanings of the options for versions newer than v3.09.7380 are different from those in versions v3.05.7174r to v3.08.7313. For the old settings, please see the old link.

  1. When you upgrade the NuLink2FW.bin to a version greater than or equal to v3.09.7380, you will see some options in NU_CFG.TXT.
  • Open the NU_CFG.TXT file in the pop-up "NuMicro MCU" disk
  1. For the Nu-Link2-Pro, you will see POWER-MODE and BRIDGE-MODE options. You need to re-plug in the USB cable to activate the setting.

  • Set POWER-MODE for SWD output voltage level (mainly for CMSIS-DAP interface use)

  • Set BRIDGE-MODE=0; this is the default setting. It has a WebUSB interface conforming to the CMSIS-DAP protocol, and you can connect to KEIL Studio Desktop/Cloud via this interface. Note that CMSIS-DAP will be disable in other BRIDGE-MODE (Limited USB endpoints).

  • Set BRIDGE-MODE=1; the pass-through bridge function of Nu-Link2-Pro will be enabled (The word Nu-Link2-Bridge will be used to represent the pass-through bridge application on Nu-Link2-Pro adapter). Nu-Link2-Bridge pass-through the data between the VCOM port and I2C/SPI/RS485/CAN interfaces. (You will see a "Nu-Link2-Bridge Virtual Com Port" in device manager.)

  • Set BRIDGE-MODE=2; a USB HID interface that supports ISPTool will be enabled. This USB HID interface doesn't pass through data, it communicates with ISPTool via HID_ISP and offers I2C/SPI/RS485/CAN interfaces for ISPTool.

  • Set BRIDGE_MODE=3; a USB HID interface that supports Boot_Loader_ISPTool will be enabled. This USB HID interface doesn't pass through data, it communicates with Boot_Loader_ISPTool via HID_MKROM_ISP, and offers I2C/SPI/RS485/CAN interfaces for Boot_Loader_ISPTool. (this mode need the firmware later than v3.10)
    Only the NuMicro chip that supports mask ROM Boot Loader (e.g., M460 series) can commnuicate with Boot_Loader_ISPTool

  1. If you use Nu-Link2-ME, it doesn't support BRIDGE functions, and you will only see the CMSIS-DAP option.
  • Set CMSIS-DAP=1; this is the default setting. It has a WebUSB interface conforming to the CMSIS-DAP protocol, and you can connect to KEIL Studio Desktop/Cloud via this interface.
  • Set CMSIS-DAP=0; it will disable CMSIS-DAP and enable the Nu-Link2 "USB BULK_ICE" interface (it's faster than "USB HID_ICE").

Comparison of NuLink2FW.bin and NuLink2_DAPLink.bin

NuLink2FW.bin

  • Proprietary code
  • Support NuMicro 8051, offline programming, encryption during data transmission, unlimited flash break points, NuMicro chip-specific features (config0/config1 dataflash setting, KPROM, etc.)
  • USB interfaces: MSC/VCOM/HID_ICE(proprietary commands) or CMSIS-DAPv2 WinUSB + WebUSB CMSIS-DAP/VCOM_Nu-Link2-Bridge or HID_ISP (defined by BRIDGE-MODE of NU_CFG.TXT)

NuLink2_DAPLink.bin

  • Open source: DAPLink on Nu-Link2-Pro
  • Support many third party IDE
  • USB interfaces: MSC/CDC/CMSIS-DAPv2 WinUSB/WebUSB CMSIS-DAP

Some other example projects for NuLink2