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GPIO on DM648

Joshua Xu
Prodigy 60 points

Hello,

      I want to use GPIO[0:7] on dm648 board. According to the manual, I set the UHPIEN pin as high through a switch (verified by  BOOTCFG bit17), and open the GPIO lpsc. When I write data to the GPIO registers(DIR01,OUT_DATA01), I see that all the registers become 0x00000000, and cannot be written.     When I set the UHPIEN pin as low, the GPIO registers can be written, but the  GP[7:0](configured as output) read from IN_DATA01 are always 0xFF.  

    Can anyone help me understand what is going on here?

Thanks,

Joshua