stm32bootload--typedef void (*fun) (void) Understanding

1. Typdef usage is shown below

1 Char uint8_t; 2  Short int   uint16_t; 3 int     uint32_t;   4 uint8_t i;  // To define a 8-bit unsigned character type variable

2. Pointer function form

1 //defines a function pointer Pfun, pointing to a function with a return type of int, with a parameter of int2 int(*pfun) (int) ; 3 //The pointer level understands that the function's function name is a pointer4 //The pointer points to the first address of the function in memory5 intShiftfun (inta)6 {7    inttemp;8temp =A;9temp<<A;Ten    returnA; One } A intMain () - { -     inttemp; the //assigns the address of the function Shiftfun to the variable pfun -Pfun =Shiftfun;  - //*pfun "is obviously taking the content of the address pointed to by Pfun, of course, is to take out the contents of function Shiftfun (), and then given a parameter of 2.  -temp = (*pfun) (2);  +}

3. typedef return TYPE (* new type) (parameter table)

 1  typedef char  (*ptrfun) (int  );    2  ptrfun pfun;  3  char  glfun ( int  a) {return    ;}  4  void   main ()  5  { 6    pfun = Glfun;  7  (*pfun) (2  );  8 } 

Up to typedef void (*fun) (void);

The function of a typedef is to define a new type of known type, so the return value of the new type (*FUNC) (void) is void.

Defines a new type, which is a function pointer that points to a function parameter of void and the return value is void.

stm32bootload--typedef void (*fun) (void) Understanding