改后一直输出低电平

2万 · 2016-5-29 17:36

void Init_All_Periph(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      RCC_Configuration();
      #if  1
      GPIO_Configuration();
      NVIC_Configuration();
      #else
      /* Configure CAN pin: RX */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      /* Configure CAN pin: TX */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
      GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF_PP;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

//  /* enabling interrupt */
      NVIC_InitStructure.NVIC_IRQChannel=USB_LP_CAN1_RX0_IRQn;// USB_LP_CAN_RX0_IRQChannel;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
      #endif

}

void GPIO_Configuration(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      /* Configure CAN pin: RX */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      /* Configure CAN pin: TX */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
      GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF_PP;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

}

//系统中断管理
void NVIC_Configuration(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;
      GPIO_InitTypeDef GPIO_InitStructure;

      /* Configure the NVIC Preemption Priority Bits */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

#if  0
#ifdef  VECT_TAB_RAM
      /* Set the Vector Table base location at 0x20000000 */
      NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
      /* Set the Vector Table base location at 0x08000000 */
      NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
#endif

//  /* enabling interrupt */
      NVIC_InitStructure.NVIC_IRQChannel=USB_LP_CAN1_RX0_IRQn;// USB_LP_CAN_RX0_IRQChannel;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

}
把上面的函数Init_All_Periph中#if 1时, cantx可以正常输出电平, 改成#if  0后, cantx一直输出低电平, 其他的程序都没有变的情况下.

2万 · 2016-5-29 17:37

没看出什么区别；

只看该作者 · 2016-5-29 17:38

void GPIO_Configuration(void)
这个函数里，就多了一个IF；

2万 · 2016-5-29 17:39

但这段程序是不影响的；

猜不出来啥问题了；

2万 · 2016-5-29 17:40

那个是被注释掉的!

2万 · 2016-5-29 17:41

程序看起来是一样的呀。
程序跑起来，看看实际寄存器配置的情况。

2万 · 2016-5-29 17:42

嗯，知道了，周末快乐