error: unresolved symbols remain

Rock,

Search for timer_isr in your code. Try renaming it to _timer_isr as it might be the compiler convention that generally converts C function to assembly by adding a prefix _.

Hi, Thomas, i have tried it,but failed. To be more specific, the problem occured in the vecs.asm. 

Rocky,

Is the function timer_isr available in the vecs.asm file? If so is it exported/global so that other modules can find it?

These are part of code in vecs.asm

.global _timer_isr  

.ref _timer_isr

_vector13: VEC_ENTRY _vec_dummy
_vector14: VEC_ENTRY _timer_isr
_vector15: VEC_ENTRY _vec_dummy

These are part of code in main.c

interrupt void timer_isr()

{

;}

So， i suppose it is global so that other modules can find it

Hi,

In vecs.asm can you rename _timer_isr  to timer_isr everywhere and try?