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power led in yellow TM4C123G

Other Parts Discussed in Thread: LMFLASHPROGRAMMER

Hello,

I have no idea what happen.  When I use CCS Edit to debug TM4C123G, it looks that the power LED turns in yellow. And I have to press the Icon of connect target to connect the TM4C123G after debugging the C program. .After I pressed the Icon, it pops up that no source available for "0x36a" or "0x???" Even worse, the program in launch pad board can not be updated any more. 

Any ideas? Thank a lot in advance.