How does AVR-GCC call a pointer to a function stored in Flash?-EEWORLD

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//---------------------------------------------------------------
// Function: Demonstrate how AVR-GCC calls a pointer to a function stored in Flash (swinging light)
//---------------------------------------------------------------
#include
#include
#include
void ledrun(void);
typedef struct
{
void (*pFun)(void);
}Function;
const Function function PROGMEM={ledrun};
void ledrun(void)
{
static unsigned char light_on=0x01;
static unsigned char light_ddr=0;
PORTD=light_on;

if (light_ddr==0)
{
  if (light_on==0x80)light_ddr=1;
  else light_on<<=1;
}

else
{
  if (light_on==0x01)light_ddr=0;
  else light_on>>=1;
}

_delay_ms(50);
}

int main(void)
{
PORTD=0;
DDRD=~0;

//void (*pFun)(void) =ledrun;

while (1)
{
  //pgm_read_word(&function.pFun);
  (*((void(*)(void))pgm_read_word(&function.pFun)))(); //Nothing else to say, the key is here
}

return 0;
}

Keywords：AVR-GCC Reference address：How does AVR-GCC call a pointer to a function stored in Flash?

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