ARM Technical Support Knowledge Articles

SWD COMMUNICATION FAILURE ON LPC11XX DEVICE

Applies to: ULINK USB-JTAG Debugger

Answer


Information in this knowledgebase article applies to:


SYMPTOM

Attempting to connect to an MCB1000 board with ULINK2 or ULINK-ME returns the following message:

SWD communication failure

in Options for Target — Debug — Settings.

CAUSE

This can happen when you mistakenly program the security bits on the LPC11xx device.

RESOLUTION

Download FlashMagic from Embedded Systems Academy, and under ISP — Erase flash make sure to check Erase all Flash+Code Rd Prot checkbox.

Then click the Erase button to erase the device. Once the security bits are reset, ULINK2 will connect normally.

SEE ALSO

ATTACHED FILES

Request the files attached to this knowledgebase article.

Article last edited on: 2011-05-16 13:32:37

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