开发板上有一个用户按键：
按键相关定义：
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] Key push-button
*/
#define BUTTON_USER_PIN GPIO_PIN_13
#define BUTTON_USER_GPIO_PORT GPIOC
#define BUTTON_USER_GPIO_CLK_ENABLE() __HAL_RCC_GPIOC_CLK_ENABLE()
#define BUTTON_USER_GPIO_CLK_DISABLE() __HAL_RCC_GPIOC_CLK_DISABLE()
#define BUTTON_USER_EXTI_IRQn EXTI13_IRQn
#define BUTTON_USER_EXTI_LINE EXTI_LINE_13
接下来使能外部中断：
BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
注册相关的中断信息：
/* Configure Button pin as input with External interrupt */
gpio_init_structure.Mode = GPIO_MODE_IT_RISING;
HAL_GPIO_Init(BUTTON_PORT[Button], &gpio_init_structure);
(void)HAL_EXTI_GetHandle(&hpb_exti[Button], BUTTON_EXTI_LINE[Button]);
(void)HAL_EXTI_RegisterCallback(&hpb_exti[Button], HAL_EXTI_COMMON_CB_ID, ButtonCallback[Button]);
/* Enable and set Button EXTI Interrupt to the lowest priority */
HAL_NVIC_SetPriority((BUTTON_IRQn[Button]), BSP_BUTTON_PRIO[Button], 0x00);
HAL_NVIC_EnableIRQ((BUTTON_IRQn[Button]));
在按键按下后，会产生中断请求，进而在回调函数中可以进行预定义的操作。
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