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TMS320F28035: Issue with debuging the asm files in the lab 5 of workshop manual

Part Number: TMS320F28035
Other Parts Discussed in Thread: C2000WARE

Hey guys:

I am a newcomer of the TI DSP IC, I am tring to finish the workshop manual as a start. 0

When I came to the lab 5 in the manual, the compiling issue really confuses me. When I was tring to debug, every line in the comment of the asm file was reported as error (I attach the screen shot below). The error code is [E0000] unrecognized special character, and "Error in Source - Assembler Aborted".

I also tried the solution project file provided with the manual, which use the same comments with the one in my project, it works well, but I replaced the asm file in my project with the one in the solution folder, same error happened again. I assumed there is something wrong/different with the project configuration or something, please let me know if you guys have any idea with the issue. I saw some answer on the forum that solve the unrecognized character erorr by changing the syntax to the asm one, but I still prefer to understand why this happened and what to set to have a correct identification. 

BTW, the version of my CCS IDE is 12.1.0.00007. 

Kaihua