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ULINK: RECOVER STR71X WHEN JTAG DISABLE


Information in this article applies to:

  • Keil Development Tools for ARM
  • ULINK USB-JTAG Adapter
  • ULINK2 USB-JTAG Adapter

QUESTION

I cannot connect to the STR71x device on my board. Instead I get messages like:

Couldn't stop ARM device

What can cause this on the STR7 STMicroelectronic Device?

ANSWER

The JTAG interface might be disabled by random CPU instructions or by the power-down mode of the device. In this case you might enable the on-chip boot loader, so that the STR71x device can execute a valid program.

The on-chip boot loader is enabled by the following settings on the configuration pins:

  • BOOTEN = 1 enable boot pins
  • BOOT1 = 0, BOOT0 = 1 enable boot loader

MORE INFORMATION

  • ARM Getting Started User's Guide

SEE ALSO

FORUM THREADS

The following Discussion Forum threads may provide information related to this topic.

Last Reviewed: Sunday, January 28, 2007


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