SMG.c(13): warning C206: 'InitHC138': missing function-prototype

This warning indicates that the function "InitHC138" has been used in the code without being declared or defined before its use. To resolve this warning, you need to declare or define the function "InitHC138" before its first use in the code.

You can declare the function at the beginning of the file or in a header file if it is defined in another source file. If the function is defined in the same source file, define it before its first use in the code.

Here is an example of how you can declare the function "InitHC138" at the beginning of the file:

void InitHC138(void);

int main()
{
    //...
}

void InitHC138()
{
    //...
}

Note that the function signature in the declaration and definition must match. In this example, the function takes no arguments and returns void.