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How to use the API functions supplied by the DSP/BIOS?

Hello:

     when building the project which used the API functions supplied by the DSP/BIOS(I use the ECM module, and includes the file ecm.h"include<ecm.h" in my program,and i don't use a .tcf file) in the CCS3.3, an error that "undefined symbol" tell me that the ECM functions I've used are undefined. why? I've included the header file ecm.h. and How to Use the API function supplied by the DSP/BIOS, Please help me,Thank you!

Best Regards!

yours wu