ARM Technical Support Knowledge Articles

LPC2000 FAST GPIO SHOW WRONG VALUES

Applies to: ULINK USB-JTAG Debugger

Answer


Information in this knowledgebase article applies to:


SYMPTOM

The FAST GPIO registers of the NXP LPC2000 devices are incorrectly displayed or the display of these changes their values. The problem occurs on all NXP LPC2000 variants that offer FAST GPIO, for example LPC2148, LPC2368, LPC2378, and LPC2468.

CAUSE

The FAST GPIO registers cannot be read with the standard JTAG ICE debug interface.

RESOLUTION

In RealView MDK 3.22a a bypass has been implemented into the ULINK driver. The debug registers are read by running an small program and no longer via the standard debug interface.

Therefore you should upgrade the RealView MDK to the latest revision.

ATTACHED FILES

Request the files attached to this knowledgebase article.

Article last edited on: 2008-07-02 10:51:31

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