DK板子上有两个用户按键：
其中，B1是复位按键，B2是用户按键。
这与原理图是一致的：
在代码中，配置PC13输入模式，并使能下降沿触发中断。
- static void EXTI13_IRQHandler_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- /* Enable GPIOC clock */
- __HAL_RCC_GPIOC_CLK_ENABLE();
- /* Configure PC.13 pin as input floating */
- GPIO_InitStructure.Mode = GPIO_MODE_IT_FALLING;
- GPIO_InitStructure.Pull = GPIO_NOPULL;
- GPIO_InitStructure.Pin = BUTTON_USER_PIN;
- HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
- /* Enable and set line 13 Interrupt to the lowest priority */
- HAL_NVIC_SetPriority(EXTI13_IRQn, 2, 0);
- HAL_NVIC_EnableIRQ(EXTI13_IRQn);
- }
- int32_t BSP_LED_Init(Led_TypeDef Led)
- {
- int32_t status = BSP_ERROR_NONE;
- GPIO_InitTypeDef GPIO_Init;
- /* Enable the GPIO_LED Clock */
- if (Led == LED9)
- {
- LED9_GPIO_CLK_ENABLE();
- }
- else /* Led = LED10 */
- {
- /* Enable VddIO2 for GPIOG */
- __HAL_RCC_PWR_CLK_ENABLE();
- HAL_PWREx_EnableVddIO2();
- LED10_GPIO_CLK_ENABLE();
- }
- /* configure the GPIO_LED pin */
- GPIO_Init.Pin = LED_PIN[Led];
- GPIO_Init.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_Init.Pull = GPIO_PULLUP;
- GPIO_Init.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
- HAL_GPIO_Init(LED_PORT[Led], &GPIO_Init);
- HAL_GPIO_WritePin(LED_PORT[Led], LED_PIN[Led], GPIO_PIN_SET);
- return status;
- }
下面是中断服务程序：
- void HAL_GPIO_EXTI_Falling_Callback(uint16_t GPIO_Pin)
- {
- if (GPIO_Pin == BUTTON_USER_PIN)
- {
- /* Toggle LED10 */
- BSP_LED_Toggle(LED10);
- }
- }
编译代码：
- arm-none-eabi-size GPIO_EXTI.elf
- arm-none-eabi-objdump -h -S GPIO_EXTI.elf > "GPIO_EXTI.list"
- text data bss dec hex filename
- 8088 24 1568 9680 25d0 GPIO_EXTI.elf
- Finished building: default.size.stdout
-
- Finished building: GPIO_EXTI.list
-
- 22:10:51 Build Finished. 0 errors, 0 warnings. (took 4s.653ms)
烧录程序，失败了，看来ST-LINK升级在所难免。
点击open in update mode
升级成功
点击小虫子进入debug模式，之后全速运行
按下板子上的用户按键，小灯状态会进行翻转。
| 
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