Gpio Operation for stm32f407

/*
#include "Stm32f4_discovery.h"
#include "stm32f4xx_conf.h"

uint32_t Gb_timingdelay;
void Delay (uint32_t ntime);

void Main ()
{
Systick_config (systemcoreclock/1000); Set Systemtick one millisecond interrupt
Rcc->ahb1enr |= 0x00000008; Enable Gpiod clock
Rcc->apb2enr |= (1<<14); Enable Syscfg clock
Gpiod->moder &= 0x00ffffff; Setting the pd12,13,14,15 output
Gpiod->moder |= 0x55000000;
Gpiod->otyper &= 0xffff0fff; Setting pd12,13,14,15 push-Pull output
Gpiod->ospeedr &= 0x00ffffff; pd12,13,14,15 Speed 100m
Gpiod->ospeedr |= 0xff000000;
SYSCFG-&GT;CMPCR = 0x00000001; Using the IO compensation Unit,
Consider using this setting when the Gpio speed exceeds 50M
GPIOD-&GT;PUPDR &= 0x00ffffff; pd12,13,14,15 no pull-up no pull-down
Gpiod->bsrrh = 0xf000; Reset register Gpiox_bsrrh, write only
Set register GPIOX_BSRRL, write only

while (1)
{
Gpiod->bsrrh = 0xf000;
GPIOD-&GT;BSRRL = 0x1000;
Delay (100);
Gpiod->bsrrh = 0xf000;
GPIOD-&GT;BSRRL = 0x1000<<1;
Delay (100);
Gpiod->bsrrh = 0xf000;
GPIOD-&GT;BSRRL = 0x1000<<2;
Delay (100);
Gpiod->bsrrh = 0xf000;
GPIOD-&GT;BSRRL = 0x1000<<3;
Delay (100);
}
}

void Delay (uint32_t ntime)
{
Gb_timingdelay = Ntime;
while (Gb_timingdelay! = 0);
}
void Systick_handler (void)
{
if (gb_timingdelay! = 0x00)
{
gb_timingdelay--;
}
}
*/

#include "Stm32f4_discovery.h"
#include "stm32f4xx_conf.h"

uint32_t Gb_timingdelay;
void Delay (uint32_t ntime);

Void Main ()
{
    systick_config (systemcoreclock/1000);//Set Systemtick one millisecond interrupt
 & nbsp; 
   /*
   //initialize LEDs mounted on stm32f4-discovery Board
&N bsp;   Stm_eval_ledinit (LED4);
    Stm_eval_ledinit (LED3);
    Stm_eval_ledinit (LED5);
    Stm_eval_ledinit (LED6);
     
   //turn on LED4 and LED5
    Stm_eval_ledo N (LED4);
    Stm_eval_ledon (LED5);
   
    while (1)
    {
     & nbsp; //toggle LED3 and LED6
        stm_eval_ledtoggle (LED3);
        Stm_eval_ledtoggle (LED6);

Insert a delay
Delay (100);

Toggle LED4 and LED5
Stm_eval_ledtoggle (LED4);
Stm_eval_ledtoggle (LED5);

Insert a delay
Delay (100);
}
*/

//-------------------------------------
Gpio_inittypedef gpio_initstructure;

Enable the gpio_led Clock
Rcc_ahb1periphclockcmd (Rcc_ahb1periph_gpiod, ENABLE);

   //configure the gpio_led pin
    gpio_initstructure.gpio_pin = Gpio_pin_12;
    Gpio_initstructure.gpio_mode = gpio_mode_out;
    gpio_initstructure.gpio_otype = gpio_otype_pp;
    gpio_initstructure.gpio_pupd = gpio_pupd_up;
    gpio_initstructure.gpio_speed = Gpio_speed_50mhz;
    gpio_init (Gpiod, &gpio_initstructure);
   //light This lamp
    gpiod->bsrrl = Gpio_pin_12;
   
    while (1)
    {
       // 
        Gpiod->odr ^= Gpio_pin_12;
       //insert a delay
        Delay (+);    
   }
   
}

Void Delay (uint32_t ntime)
{
    gb_timingdelay = ntime;
    while (gb_ Timingdelay! = 0);
}
void Systick_handler (void)
{
    if (gb_timingdelay! = 0x00)
    {         gb_timingdelay--;
   }
}