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Built-in Functions
va_start
Syntax:
va_start( argptr , variable )
Parameters: argpt r is a special argument pointer of type va_list
variable – The second parameter to va_start() is the name of the last parameter
before the variable-argument list.
Returns:
Function:
Availability:
Requires:
Examples:
None
The function will initialize the argptr using a call to the macro va_start().
All devices.
#INCLUDE <stdarg.h>
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr;
// create special argument pointer
va_start(argptr,num);
// initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr);
return sum;
}
// end variable processing
Example
Files:
Also See:
None
nargs(), va_start(), va_arg()
write_bank( )
Syntax:
write_bank ( bank , offset , value )
Parameters: bank is the physical RAM bank 1-3 (depending on the device)
offset is the offset into user RAM for that bank (starts at 0)
value is the 8 bit data to write
Returns:
Function:
undefined
Write a data byte to the user RAM area of the specified memory bank. This
function may be used on some devices where full RAM access by auto variables is
not efficient. For example on the PIC16C57 chip setting the pointer size to 5 bits
will generate the most efficient ROM code however auto variables can not be
above 1Fh. Instead of going to 8 bit pointers you can save ROM by using this
305
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