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Check this Code for Stm32f407, Just bilnking the led4 , it is not blinking led

#include "stm32f4xx.h"

void delay_ms(uint16_t dly)
{
uint32_t f;
for(;dly>0;dly--)
{
for(f=250;f>0;f--);
for(f=250;f>0;f--);
}
}

GPIO_InitTypeDef GPIO_InitStruct;
int main()
{

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOD,&GPIO_InitStruct);

GPIO_SetBits(GPIOD,GPIO_Pin_4);

while(1)
{
GPIO_SetBits(GPIOD,GPIO_Pin_4);
delay_ms(1000);

GPIO_ResetBits(GPIOD,GPIO_Pin_4);
delay_ms(1000);

}
}