Zilog EZ80F916 - Manual (Page 174)

UM014423-0607 Using the ANSI C-Compiler
ZiLOG Developer Studio II
eZ80Acclaim! ® User Manual
154
The sin function is defined in the C math library.
Assembly File
XREF _sin
segment DATA
_angle:
df 0.523599 ; angle in radians
_res: ; result
ds 4
segment CODE
_myfunc:
...
push DE
; save the live data, if any
ld BC,(_angle)
push BC
; push the argument
ld A,(_angle+3)
ld C,A
push BC
call _sin
; call the C function
pop BC ; restore the stack by popping out the arguments
pop BC
ld (_res),HL ; result is in E:HL registers
ld A,E
ld (_res+3),A
pop DE
; restore the live data
...
Referenced C Function Prototype
double sin (double x);
NOTE: As mentioned in “Double Treated as Float” on page 166, the eZ80 Acclaim!
C-Compiler treats
double
s as if they were
float
s.
COMMAND LINE OPTIONS
The compiler, like the other tools in ZDS II, can be run from the command line for pro-
cessing inside a script, and so on. Please see “Compiler Command Line Options” on
page 383 for the list of compiler commands that are available from the command line.
RUN-TIME LIBRARY
The C-Compiler provides a collection of run-time libraries. The largest section of these
libraries consists of an implementation of much of the C Standard Library. A smaller
library of functions specific to ZiLOG or to the eZ80Acclaim! is also provided.