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

• ULINK: RESET BEHAVIOUR ON PHILIPS LPC2000 DEVICES
• ULINK: PHILIPS LPC2000 ARM DEVICE DOES NOT REACT
• ULINK: ATMEL AT91SAM7 DEVICE DOES NOT REACT
• MCBSTR750: RECOVER STR75X WHEN JTAG DISABLED

FORUM THREADS

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

• Could not stop ARM device?
• MCBSTR7 Eval board does not response to STR_IAP code
• Ulink problem?
• No JTAG Found

Last Reviewed: Sunday, January 28, 2007