Hi All,
I need some help to understand: PASS_STRINGS=IN_RAM.
What real happen?
Code:
PASS_STRINGS=IN_RAM
#define str "Hello"
void main ()
{
while(1){
printf(str);
}}
The str is copied in ram when the Pic is programmed or is copied every time I call printf?
I hope the second one, right?. Manual:
A new way to pass constant strings
to a function by first copying the
string to RAM and then passing a
pointer to RAM to the function.
Ttelmah
Joined: 11 Mar 2010 Posts: 19381
Posted: Sat Mar 18, 2017 4:45 am
It's basically copied when you use it. However internally it's slightly more complex. The 'buffer' used is much smaller than the longest string you use. So you can have:
Code:
const string1[] = "One test string";
const string2[] = "Another test string";
Then pass these to functions expecting 'char *', as if they are in RAM.
The buffer used is only a few bytes, but there is an added overhead, in that the compiler has to add code to 'know' how to handle this.
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