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C–– Compiler
5-23Code Development Tools
the MSP50C6xx length of the string. It is included in the cmm_macr.h file, and
is called STR_LENGTH(lstr). For example, STR_LENGTH(8) is 8–2 = 6.
Also note that the user has to supply the length of the input string and the length
of the output string in the string multiply operations: the result of multiplying a
string by an integer can be one word longer than the input string. Unpredictable
results may occur if parameter lgr is not at least equal to lgr+1.
5.5.10 Constant Functions
The only two constant functions implemented in C– – are xfer_const and
xfer_single.
cmm_func xfer_const(int *out,int *constant_in,int lg)
It transfers lg+2 integers from program ROM starting at address
constant_in to RAM, starting at address out. Note that constant_in is
not doubled, because it is used in A0 in a MOV A0,*A0 operation. The C– –
compiler takes care of this.
cmm_func xfer_single(int *out,int *constant_in)
transfers a single value.
An example of the use of xfer_const is:
int array[8],i;
const int atan[80*8] ={.........640 integers );
/* .... */
for(i=0;i<80;i++){
xfer_const(array,&atan[i*8],STR_LENGTH(8));
/* ... now use array normally
..... */
}