stm32F4xx_gpio.c 第488~503行代码看不懂，求指导

海之深沉 · 发表于 2017-5-15 09:21:11

代码如下：（这个代码是实现什么功能的，求详细解释）
/**
  * @brief  Toggles the specified GPIO pins..
  * @param  GPIOx: where x can be (A..K) to select the GPIO peripheral for STM32F405xx/407xx and STM32F415xx/417xx devices
  *                   x can be (A..I) to select the GPIO peripheral for STM32F42xxx/43xxx devices.
  *                   x can be (A, B, C, D and H) to select the GPIO peripheral for STM32F401xx devices.
  * @param  GPIO_Pin: Specifies the pins to be toggled.
  * @retval None
  */
void GPIO_ToggleBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  GPIOx->ODR ^= GPIO_Pin;
}