C and assembly Mix programing

[cool_harry]

Hi, i am using 8051 core controller and Keil compiler.I have written a code in C. Now i need some of its routines to be converted into assembly. Plz tell me how to start.
Specifically i need guidance on how to call a Assembly func from C program where i am passing 2 unsigned long variable into that func. For eg. asm(var1,var2);
where var1 & var 2 are unsigned long datatypes and asm is a function written in assembly...

 

[jan noha]

To keep it simple, I usually start from SRC compiler directive of Keil. I write a skeleton of function and let Keil help me to create a skeleton in ASM itself. Afterwards I include asm file with full instead of previous .C file and let .H as it is.

Sometimes I only write whole C function and only make complete or partial hand-optimization with the help of asm/endasm directives.

Last but not least, everything about mixing C and ASM codes is described in Keil's manuals, so if you need to know more RTFM.

Jan