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CCS/LAUNCHXL-CC26X2R1: launchpad debugging fails AND Flash programmer 2 fails to detect the launchpad

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Part Number:LAUNCHXL-CC26X2R1

Tool/software: Code Composer Studio

running the SBP_OAD example, on CCS 7.4, I'm able to single-step a few instructions, but letting the debugging continue (F8), the debugging fails with this message:

Cortex_M4_0: GEL Output: Memory Map Initialization Complete.
Cortex_M4_0: GEL Output: Board Reset Complete.
Cortex_M4_0: JTAG Communication Error: (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 7.0.100.0) 
Cortex_M4_0: Failed to remove the debug state from the target before disconnecting.  There may still be breakpoint op-codes embedded in program memory.  It is recommended that you reset the emulator before you connect and reload your program before you continue debugging

I'm also having problem detecting the launchpad on the "flash programmer 2" application. I get this message after activating the APP:




running xdsdfu I get this:

C:\ti\ccsv7\ccs_base\common\uscif\xds110>xdsdfu.exe -e

USB Device Firmware Upgrade Utility
Copyright (c) 2008-2015 Texas Instruments Incorporated.  All rights reserved.

Scanning USB buses for supported XDS110 devices...


<<<< Device 0 >>>>

VID: 0x0451    PID: 0xbef3
Device Name:   XDS110 Embed with CMSIS-DAP
Version:       2.3.0.11
Manufacturer:  Texas Instruments
Serial Num:    L11002N2
Mode:          Runtime

Found 1 device.

C:\ti\ccsv7\ccs_base\common\uscif\xds110>


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