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RTOS: McASP1 I/O output Voltage level drops down to 1.8V

Tool/software: TI-RTOS

Thank you for your attention to my post.

When we test K2GEVM ,We found there is a hardware problem .We connect the pins( MCK pin,BCK pin,FCK pin,Data1 pin,Data2 pin,Data3 pin,Data4 pin,SDA pin and SCL pin  ) of  K2GEVM to our circuit board which is

supplied by 12V single. we find  that the  votage  of  MCK pin, SDA pin  and SCL pin  is 3.3V  ,meanwhile  the other pin output votage is 1.8 V  .The K2GEVM does not  work properly. We don't know what is wrong with the

problem. What shoud  we do to make the K2GEVM work normally ?  Thank you for  your help .

Wujun