#define LED_D GPIO_Pin_7	// 74HC595 Data pin
#define LED_C GPIO_Pin_5	// 74HC595 Clock pin
#define LED_W GPIO_Pin_6	// 74HC595 Write pin
 
// Data to display on LED 7-seg
const uint8_t LED_data[] = {	0x6f, //01101111 0
				0x28, //00101000 1
				0x5d, //01011101 2
				0x7c, //01111100 3
				0x3a, //00111010 4
				0x76, //01110110 5
				0x77, //01110111 6
				0x2c, //00101100 7
				0x7f, //01111111 8
				0x7e, //01111110 9
				0x00, //00000000 space
				0x17, //00010111 F
				0x80, //10000000 .
				0x67, //01100111 G
				0x53, //01010011 t
				0x47, //01000111 C
			};
 
main {
...
  /* Initialize 74HC595 pins Out Push-Pull */
  GPIO_InitStructure.GPIO_Pin  = LED_D|LED_C|LED_W;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  GPIO_ResetBits(GPIOA, LED_D|LED_C|LED_W);
...
LED_write(LED_data[8]);
...
}
 
void LED_write(uint8_t disp){
	uint8_t i;
	//bit banging
	for(i=0; i<8; i++)
	{
		if ( disp & 0x80)
			GPIO_ResetBits(GPIOA, LED_D);
		else GPIO_SetBits(GPIOA, LED_D);
		disp = disp <<1;
		GPIO_SetBits(GPIOA, LED_C);
		GPIO_ResetBits(GPIOA, LED_C);
	}
	GPIO_SetBits(GPIOA, LED_W);
	GPIO_ResetBits(GPIOA, LED_W);
}