用stm32f407寄存器点亮流水灯的代码

以下是可以提供的代码：

#include "stm32f4xx.h"

void delay(uint32_t time);

int main(void)
{
  // Enable clock for GPIO Port D
  RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;

  // Set pin 12, 13, 14 and 15 as output pins
  GPIOD->MODER |= GPIO_MODER_MODE12_0 | GPIO_MODER_MODE13_0 | GPIO_MODER_MODE14_0 | GPIO_MODER_MODE15_0;

  while(1)
  {
    // Turn on LED 1
    GPIOD->BSRR = GPIO_BSRR_BS12;
    delay(500000);
    // Turn on LED 2
    GPIOD->BSRR = GPIO_BSRR_BS13;
    delay(500000);
    // Turn on LED 3
    GPIOD->BSRR = GPIO_BSRR_BS14;
    delay(500000);
    // Turn on LED 4
    GPIOD->BSRR = GPIO_BSRR_BS15;
    delay(500000);
    // Turn off all LEDs
    GPIOD->BSRR = GPIO_BSRR_BR12 | GPIO_BSRR_BR13 | GPIO_BSRR_BR14 | GPIO_BSRR_BR15;
    delay(500000);
  }
}

void delay(uint32_t time)
{
  while(time--)
  {
    __asm("NOP");
  }
}