STM32F072的寄存器LED闪烁

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wambob 发布时间：2015-1-26 15:37

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赞收藏 1 评论15 发布时间：2015-1-26 15:37

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mmttss 回答时间：2015-1-27 00:40:24

我依样画葫芦下 STM32F429 discovery 也成功了
我先用 STM32CubeMX create 一個空的 STM32F429ZI Project(未规划任何Pins)
用Keil开启 Project

再将 wambob大大的 code 搬上 main.c
最后找出 LED pin 相關的暂存器即可

static unsigned char fac_us;
static unsigned int fac_ms;
void Delay_Init(unsigned char SYSCLK)
{
SysTick->CTRL&=0xFFFFFFFB;
fac_us=SYSCLK/8;
fac_ms=(unsigned int)fac_us*1000;
}
void delay_us(unsigned int nus)
{
      unsigned long temp;
      SysTick->LOAD=(unsigned long)nus*fac_us;
      SysTick->VAL =0x00;          //?????
      SysTick->CTRL=0x01 ;       //????
      do
      {
            temp=SysTick->CTRL;
      }
      while((temp&0x01)&&!(temp&(1<<16)));//??????
      SysTick->CTRL=0x00;    //?????
      SysTick->VAL =0X00;    //?????
}

void delay_ms(unsigned int nms)
{
      unsigned long temp;
      SysTick->LOAD=(unsigned long)nms*fac_ms;
      SysTick->VAL =0x00;          //?????
      SysTick->CTRL=0x01 ;       //????
      do
      {
            temp=SysTick->CTRL;
      }
      while((temp&0x01)&&!(temp&(1<<16)));//??????
      SysTick->CTRL=0x00;    //?????
      SysTick->VAL =0X00;    //?????
}

void LED_Init(void)
{
RCC->AHB1ENR|=0x40;//1<<17;
GPIOG->MODER&=0xf0ffffff;
GPIOG->MODER|=0x04000000; //怀堤
GPIOG->OTYPER&=0xffffffef;  //芢侺
GPIOG->OSPEEDR|=0x00000c00;  //詢厒
}

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */

  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* USER CODE BEGIN 3 */
  /* Infinite loop */
      Delay_Init(48);
  LED_Init();

  while (1)
  {
GPIOG->ODR|=0x00002000;
delay_ms(1000);
GPIOG->ODR&=0xffffcfff;
delay_ms(1000);
  }
  /* USER CODE END 3 */

}