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CCS/CC3200: CCS upgrade from 6.2.0 to 7.1.0 then downgrade. My working program doesn't work any more.

Part Number: CC3200

Tool/software: Code Composer Studio

Hi, CCS/CC3200 Experts.

I have a very strange situation. I used to use CCS 6.2.0 to compile my program. It worked fine. Last week, I upgraded CCS 6.2.0/SDK 1.2.0 to CCS 7.1.0/SDK1.3.0 and compiled my program. The compilation was ok. But when I flashed to my board, I found CC3200 doesn't talk to the other board (via UART). I could not figure it out what may cause the problem. So I uninstalled CCS 7.1.0 and SDK 1.3.0 and reinstalled CCS 6.2.0 and SDK 1.2.0. I compiled my program again without any problem. But when I flashed to my board, I found CC3200 still doesn't talk to the other board. I was confused and don't know what caused the problem.

My coworker didn't update his CCS (he still has old CCS 6.1.3) so I compiled my program with his PC. Then I flashed my board and found it worked.

It sounds very strange. Does it make any sense to you? Any idea what may cause this kind of problem?

Thanks in advance,

Allen