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Support for RDI compatible ARM debuggers

The J-Link-RDI software is an RDI interface for J-Link. It makes it possible to use J-Link with any RDI compliant debugger. The package consists of 2 DLLs, which need to be copied to the same folder. In order to use these DLLs, they need to be selected in the debugger. It is a separate item and not included in the J-Link software. For more information on the pricing please check out our Price list.

Software download

Supported ARM Debuggers

J-Link RDI can be used with any RDI-compliant debuggers. In the following all RDI compliant debuggers which have been tested with J-Link RDI are listed.

  • ARM® Developer Suite (ADS)
  • ARM® RealView® Development Suite (RVDS) V3.0 (Since RVDS 3.1 removed RDI support, J-Link RDI will not work with RVDS 3.1)
  • IAR Embedded Workbench for ARM (EWARM)
  • RealView® Microcontroller Development Kit (Keil MDK)
  • Greenhills (GHS) MULTI

For more information about how to use RDI with debuggers listed above, please refer to the J-Link RDI User's Guide (UM08004).

Unlimited Flash Breakpoints

The RDI DLL allows setting software breakpoints in flash memory areas, in the following called flash breakpoints. This makes it possible to set an unlimited number of flash breakpoints, rather than just the 2 hardware breakpoints permitted by the ICE. Setting flash breakpoints is executed very fast using a RAMcode specially designed for this purpose; on chips with fast flash the difference between breakpoints in RAM and Flash is unnoticeable.

More information about Unlimited Flash Breakpoints


RDI allows various configuration settings, such as:

  • Target system initialization via setup file
  • JTAG Speed and scan chain settings
  • Enable / disable Flash programming
  • Breakpoint settings (use software breakpoints, use Unlimited Flash Breakpoints)
  • CPU specific settings (Endianess, Reset strategy)
  • Enable / Disable Logfiles

Commands in the setup file

Command Description
SetJTAGSpeed(x); Sets the JTAG speed, x = speed in kHz (0=Auto)
Delay(x); Waits a given time,
x = delay in milliseconds
Reset(x); Resets the target,
x = delay in milliseconds
Go(); Starts the ARM core
Halt(); Halts the ARM core
Read8(Addr); Reads a 8/16/32 bit value,
Addr = address to read (as hex value)
Verify8(Addr, Data); Verifies a 8/16/32 bit value,
Addr = address to verify (as hex value)
Data = data to verify (as hex value)
Verify16(Addr, Data);
Verify32(Addr, Data);
Write8(Addr, Data); Writes a 8/16/32 bit value,
Addr = address to write (as hex value)
Data = data to write (as hex value)
Write16(Addr, Data);
Write32(Addr, Data);
WriteVerify8(Addr, Data); Writes and verifies a 8/16/32 bit value,
Addr = address to write (as hex value)
Data = data to write (as hex value)
WriteVerify16(Addr, Data);
WriteVerify32(Addr, Data);
WriteRegister(Reg, Data); Writes a register
WriteJTAG_IR(Cmd); Writes the JTAG instruction register
WriteJTAG_DR(nBits, Data); Writes the JTAG data register

Example of setup file

*    Setup file for J-LINK RDI
* File:    LPC2294.setup
* Purpose: Setup for Philips LPC2294 chip
Write32(0xE01FC040, 0x00000001); // Map User Flash into Vector area at (0-3f)
Write32(0xFFE00000, 0x20003CE3); // Setup CS0
Write32(0xE002C014, 0x0E6001E4); // Setup  PINSEL2 Register