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problem calling function

 
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mnv



Joined: 04 Aug 2004
Posts: 7

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problem calling function
PostPosted: Wed Aug 04, 2004 8:37 am     Reply with quote
hi!

see the code above:

Code:


...

void myFunction(char *str1) {
    putc('x');
}

...

void main() {

    ...

    myFunction("hello");

    printf("ok");

    //end
    while (1) {
    }

}



in real the function "myFunction" is declared in an external header-file. in a former version of the function i used the parameter "str1" for printf. but i removed the printf-command because i got only trash.
as you can see the serial port monitor should show me "xhok" in this version, but it shows me "xxxxxok" instead. this means, that the function "myFunction" is executed five times although it is called only once! but when i remove "char *str1" so the function receives no more parameter, it works fine. but i need the parameter for the printf-command in the function.
so what can be the reason of that the function is executed several times and that the pointer "str1" points to invalid data and how can i get that fixed?

thank you!
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Aug 04, 2004 10:37 am     Reply with quote
Pointers to string constants are not supported. You will need to copy "Hello" to RAM and then call your function with the address of the RAM variable. The reason it is being called 5 times is that the compiler calls it for each char in your string.
Guest
PostPosted: Wed Aug 04, 2004 10:40 am     Reply with quote
hey, thanks!
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