How to call the static function from another c file?

Question

I want to call a static function from another C file. But it always show \"function\" used but never defined.

In ble.c

Answer 1

Static function has internal linkage and it can be called only by functions written in the same file. However if you want to call static function from another file , we have a trick in C. Fallow the steps. 1. Create a function pointer globally in ble.c and define it.

(void)(*fn_ptr)();
static void bt_le_start_notification(void)
{
    WPRINT_BT_APP_INFO(("bt_le_start_notification\n"));
    fn_ptr=bt_le_start_notification;

}

in main.c extern the function pointer

 #include "ble.h"
extern fn_ptr;

void application_start( void )
{
  fn_ptr();
}

Hope it will be useful.