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(Error -1015 @ 0x0) when debugging TMS320F28335

Hi everyone,

I'm quite new in using TI C28xx DSCs, as well as CCS. I was playing with simple GPIO example, debugging it successfully with XDS100v2 probe, but after few sessions I've got following message:

C28xx: Error connecting to the target: (Error -1015 @ 0x0) Device is not responding to the request.  Device may be locked, or the debug probe connection may be unreliable. Unlock the device if possible (e.g. use wait in reset mode, and power-cycle the board). If error persists, confirm configuration and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.1.641.0)

What shall I do to resolve this? Thanks in advance.

Miodrag