STM32F030F4的PF0设置问题

只看该作者 · 2015-3-30 13:54

最近在做一个项目，用到了STM32F030F4中的PF0口，将其当做普通GPIO口使用，将其设置为输入模式，发现该管脚始终为高电平，请问是怎么回事

只看该作者 · 2015-3-30 14:02

先把晶振选择到背部晶振，再配置GPIO

只看该作者 · 2015-3-30 14:37

bbstr 发表于 2015-3-30 14:02
先把晶振选择到背部晶振，再配置GPIO

你好，我的PF0配置如下，请看看还需要增加什么配置（最好能写一下），非常感谢

GPIO_InitStruct.GPIO_Pin = LED_RED_FB; //即PF0口
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOF, &GPIO_InitStruct);

只看该作者 · 2015-3-30 15:04

/**
  * @brief  Configures the System clock frequency, AHB/APBx prescalers and Flash
  *       settings.
  * @NOTE This function should be called only once the RCC clock configuration
  *       is reset to the default reset state (done in SystemInit() function).
  * @param  None
  * @retval None
  */
static void SetSysClock(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;

  /* SYSCLK, HCLK, PCLK configuration ----------------------------------------*/
  /* Enable HSE */
  //RCC->CR |= ((uint32_t)RCC_CR_HSEON);
RCC->CR &= ~((uint32_t)RCC_CR_HSEON);
  /* Wait till HSE is ready and if Time out is reached exit */
  do
  {
HSEStatus = RCC->CR & RCC_CR_HSERDY;
StartUpCounter++;
  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
HSEStatus = (uint32_t)0x01;
  }
  else
  {
HSEStatus = (uint32_t)0x00;
  }

  if (HSEStatus == (uint32_t)0x01)
  {
/* Enable Prefetch Buffer and set Flash Latency */
FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;

/* HCLK = SYSCLK */
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;

/* PCLK = HCLK */
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV1;

/* PLL configuration = HSE * 6 = 48 MHz */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_PREDIV1 | RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLMULL6);

/* Enable PLL */
RCC->CR |= RCC_CR_PLLON;

/* Wait till PLL is ready */
while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}

/* Select PLL as system clock source */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;

/* Wait till PLL is used as system clock source */
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)
{
}
  }
  else
  { /* If HSE fails to start-up, the application will have wrong clock
      configuration. User can add here some code to deal with this error */
  }
}

只看该作者 · 2015-3-30 15:05

bbstr 发表于 2015-3-30 15:04
/**
* @brief Configures the System clock frequency, AHB/APBx prescalers and Flash
* se ...

红色字体的就是设置是吗？

只看该作者 · 2015-3-30 16:07

bbstr 发表于 2015-3-30 15:04
/**
* @brief Configures the System clock frequency, AHB/APBx prescalers and Flash
* se ...

好好听这位高手的吧
我自己没用过
帮你顶了

只看该作者 · 2015-3-30 16:16

没记错的话，
RCC->CR |= ((uint32_t)RCC_CR_HSEON); //使用外部晶振
RCC->CR &= ~((uint32_t)RCC_CR_HSEON);//使用内部晶振

你先改成RCC->CR &= ~((uint32_t)RCC_CR_HSEON);

然后再配置GPIO试试看，我以前作为输出是没问题的