| hua_wind |
| (stranger) |
| Mon Nov 05 2007 08:14 PM |
why? about hi-tech c for HT
|
Please use Code tags to maintain formatting and improve code readability. I have added them here. (admin)
Code:
void delay(unsigned char x);
void main()
{
while(1)
{
#asm
MOV a,50
CALL _delay
#endasm
}
}
void delay(unsigned char x)
{
while(x--);
}
编译中...
HI-TECH C COMPILER (Holtek MCU) V9.10PL6
Copyright (C) 1984-2006 HI-TECH SOFTWARE
licensed for evaluation purposes only
this licence will expire on Tue, 04 Dec 2007
: 0: (800) undefined symbol "_delay"
Compilation failed - error code 1
why?
| Dan Henry |
| (Guru) |
| Mon Nov 05 2007 08:26 PM |
|
Re: why? about hi-tech c for HT
|
I don't use the Holtek toolchain, but HI-TECH's documentation for other processors has been pretty good about detailing the naming conventions required to interface C to ASM. Does your query originate because of a discrepancy between the toolchain documentation and the toolchain behavior?
| Mark Pappin |
| () |
| Mon Nov 05 2007 09:32 PM |
Re: why? about hi-tech c for HT
|
Quote:Our PRO compilers with OCG (of which the HOLTEK compiler is one) do very aggressive dead-code elimination and if a C function or variable is not accessed from within C code it will probably not exist in the output. Unless you've got a very good reason to do so, you should not try to do stuff with inline assembly code that can much more easily be done in C.
: 0: (800) undefined symbol "_delay"
why?
By The Way, you should also avoid using #asm / #endasm close to C flow-control constructs like for, while, if, etc., as recommended in the manual.
| hua_wind |
| (stranger) |
| Mon Nov 05 2007 09:40 PM |
|
Re: why? about hi-tech c for HT
|
please explain me the rule of parameters' transmition (from asm to c)
ex:
xyz(unsigned char x,unsigned char y,unsigned char z)
| hua_wind |
| (stranger) |
| Mon Nov 05 2007 10:01 PM |
|
Re: why? about hi-tech c for HT
|
in other words,what's the difference between holtek c compile and HI-tech c compile about parameters'transmiting(from asm to c)
| C.J. Prins |
| () |
| Tue Nov 06 2007 03:04 AM |
|
Re: why? about hi-tech c for HT
|
I'm using the H8/300H compiler. For that compiler it's better to use the C-function asm() to have assembly lines included. In that way, many problems can be prevented.
For example:
asm("BCLR #7,@_SCI0_SSR"); // TDRE = 0
With kind regards from a rainy Holland.
Cojan Prins.
| hua_wind |
| (stranger) |
| Tue Nov 06 2007 08:45 PM |
|
Re: why? about hi-tech c for HT
|
Unless you've got a very good reason to do so, you should not try to do stuff with inline assembly code that can much more easily be done in C.
using by interrupt program.........