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发表于 2018-4-18 14:43:50
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没问题,只要是中断就可以调用,看这个例子里面我做的SD卡插拔检测就是用的这个。
http://www.armbbs.cn/forum.php?m ... &extra=page%3D1
EXTI中断及其配置:
- /*--------------------------- SD_Link_EXTIConfig ---------------------------------------*/
- void SD_Link_EXTIConfig(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- EXTI_InitTypeDef EXTI_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- /* 安富莱STM32-V6开发板使用PE2作为中断输入口, 下降沿表示中断信号
- 未插入SD卡的时,PE2引脚是高电平,插入后,PE2引脚是低电平。
- */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
- /* 配置中断引脚是输入 */
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
- GPIO_Init(GPIOE, &GPIO_InitStructure);
- /* 配置外部中断线连接到相应引脚 */
- SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource2);
- /* 配置外部中断线 */
- EXTI_InitStructure.EXTI_Line = EXTI_Line2;
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;
- EXTI_Init(&EXTI_InitStructure);
- /* 使能中断通道 */
- NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- /*--------------------------- EXTI2_IRQHandler ---------------------------------------*/
- void EXTI2_IRQHandler(void)
- {
- if (EXTI_GetITStatus(EXTI_Line2) != RESET)
- {
- EXTI->IMR&=~(1<<2); /* 关闭中断 */
- if(HandlePinDetectStart)
- {
- isr_evt_set(SDDetectBIT_0, HandlePinDetectStart);
- }
-
- /* 清中断挂起位 */
- EXTI_ClearITPendingBit(EXTI_Line2);
- }
- }
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任务:
- while(1)
- {
- /*
- 1. 无限等待SD卡插拔状态变化。
- 2. 无限等待网线插拔状态变化,暂未放在这个任务实现。
- */
- if(os_evt_wait_or(PinDetect_ALL, usMaxBlockTime) == OS_R_EVT)
- {
- xResult = os_evt_get ();
-
- switch (xResult)
- {
- case SDDetectBIT_0:
- /* 设置一段延迟时间,滤除插拔SD卡时造成的抖动, 拔出过程误差较大,这里等待100ms再检测 */
- os_dly_wait(100);
- if((GPIOE->IDR & (1 << 2)))
- {
- UnmountSD(); /* 卸载SD卡 */
- WM_SendMessageNoPara(hWinStatus, MSG_SDPlugOut);
- }
- else
- {
- MountSD(); /* 挂载SD卡 */
- WM_SendMessageNoPara(hWinStatus, MSG_SDPlugIn);
- }
- EXTI->IMR |= (1<<2); /* 使能中断 */
- break;
-
- /* 其他值不处理 */
- default:
- break;
- }
- }
- }
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