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Hi: I wish to call function "pow" (which is standard function in library) from my assembly code. How can I do it? Thanks!
write a C call, look at the generated assembly code. Erik
and read the section in the Manual titled - wait for it - "Interfacing 'C' and Assembler" A bit cryptic, I know, but...
Hi, Thanks for your responses! Now I can call C library functions(pow()) from my assembly code. But another issue occurs. I need keep the code size under 32k and I have about 11k free space availiable. The linker ignored my free space and always put library function on higher address space(beyond 32k - >0x8000). Why does this happend? How can I tell linker to put library code right after my assembly code? Any comments are appreciated! Thank you!
You must unlimited Keil C51, PK51 ...
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!
Sounds to me like you have too little stack space allocated. Michael Karas