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FAQ

Q: How do I use the LaunchPad and my Segger J-Link to debug the target externally? It won't connect to

the onboard connector.

A: The Segger J-Link is the only major ARM debugger that doesn't come with an adapter for the 10-pin

small pitch ARM connector. The adapter cable is found here, and can be purchased from Digi-Key here

Q: Why doesn't the back-channel UART on the MSP432 LaunchPad work with my serial terminal program

at speeds faster than 56000 baud?

A: Certain serial terminal programs such as HTerm or the CCS built-in terminal might not work with the

MSP432 LaunchPad at specific baudrates, resulting in the software not being able to open the virtual

COM port or in the baud rate getting configured incorrectly. An issue with the LaunchPad emulator

firmware has been identified and will be fixed in the next release. Until the update is available, use Tera

Term, ClearConnex, or HyperTerminal instead or reduce the baud rate to speeds of 38,400 baud or lower.

Q: Problems plugging the MSP432 LaunchPad into a USB3.0 Port

A: It has been observed that when the MSP432 LaunchPad is connected to USB3.0 ports provided by a

certain combination of USB3.0 host controller hardware and associated device drivers that the IDE is

unable to establish a debug session with the LaunchPad, resulting in an error message like “CS_DAP_0:

Error connecting to the target: (Error -260 @ 0x0) An attempt to connect to the XDS110 failed.” in the

case of Code Composer Studio. In this case the CCS-provided low-level command line utility ‘xdsdfu' will

also not be able to establish a connection with the LaunchPad.

Specifically, this issue was observed on PCs running Windows 7 that show the “Renesas Electronics USB

3.0 Host Controller” and the associated “Renesas Electronics USB 3.0 Root Hub” in the device manager.

After updating the associated Windows USB drivers to more recent versions obtained from the hardware

vendor the issue went away. There might be other USB3.0 hardware and device driver combinations that

will lead to the same issue. If you think you might be affected try contacting your PC vendor or try locating

and installing more recent versions of the USB3.0 device drivers. Alternatively, connect the LaunchPad to

an USB2.0 port on your PC if available.

Q: I can't get the backchannel UART to connect. What's wrong?

A: Check the following:

• Do the baud rate in the host's terminal application and the eUSCI settings match?

• Are the appropriate jumpers in place, on the isolation jumper block?

• Probe on RXD and send data from the host. If you don't see data, it might be a problem on the host

side.

• Probe on TXD while sending data from the MSP432. If you don't see data, it might be a configuration

problem with the eUSCI module.

• Consider the use of the hardware flow control lines (especially for higher baud rates).

SLAU597–March 2015 MSP

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EXP432P401R LaunchPad™ Evaluation Kit

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