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CALLING C LIBRARY FUNCTION FROM ASSEMBLY

Hui J

Hi:

I wish to call function "pow" (which is standard function in library) from my assembly code. How can I do it? Thanks!

Parents
  • 0 in reply to Eduard Jadron

    Hi,

    Now, I finally found the solution. I save all data in internal ram(128 bytes),PSW and SP to external ram before I call C code. And copy back the data from extern ram to internal ram after finish C call, the code works very well. Not sure what the problem it is. Stack or something is changed in internal ram after calling C code?
    But, this code only works if I located it to space from 0x0000 to 0x7fff(32k). If I relocated this code to space from 0x8000 to 0xffff, it will "reboot" everytime I call C code. Does C code need space between 0x0000 to 0x8000? Thank you! Any comments will be appreciated!

Reply
  • 0 in reply to Eduard Jadron

    Hi,

    Now, I finally found the solution. I save all data in internal ram(128 bytes),PSW and SP to external ram before I call C code. And copy back the data from extern ram to internal ram after finish C call, the code works very well. Not sure what the problem it is. Stack or something is changed in internal ram after calling C code?
    But, this code only works if I located it to space from 0x0000 to 0x7fff(32k). If I relocated this code to space from 0x8000 to 0xffff, it will "reboot" everytime I call C code. Does C code need space between 0x0000 to 0x8000? Thank you! Any comments will be appreciated!

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