problem with two usart running together

hi,
i encounter weird problem arduino due.
i writing code in atmel studio. of project complete.
but when tried add new feature project utilize usart  code began stuck in function set pdc pointer, counter , setting time-out timer...

the function controller stuck in worked before added new feature....

i came here because after week of fighting clueless....


any advice?

 

with no code at, clueless. if project large, try write new, small, program shows error.

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