FX3 firmware file cyfxtx.c  : bits beyond valid memory

Hello, I want to know the bit ordering of FX3

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Update : Sorry,  I mean CyU3PDmaBufferInit  actually, not CyU3PDmaBufferDeInit.

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at  the function   CyU3PDmaBufferInit the source file   cyfxtx.c,

there is a comment  says

"make those bits beyond valid memory range as unavailable."

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For example :

If I set my heap size to  2292 byte , then

   2292/32 =71 bit , 71 status bits are required , and also

         71 mod 32 = 7 .

7 bits are in     glBufferManager.usedStatus[size - 1]

and there is a local variable

     temp = 32 -7 = 25,

so i have 25 bits beyond valid memory range.

and finally the masking

glBufferManager.usedStatus[size - 1]       = ~((1 << 25) - 1)

  then i set the highest  7 bits of

glBufferManager.usedStatus[size - 1]   to 1.

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please correct me if I'm wrong.

訊息由此人編輯：學人 楊