[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fsaUmka_NSb1TUW30UbI0SI8zRYnqX6T1OaZoGxWs_yY":3},{"id":4,"source":5,"question":6,"options":7,"answer":12,"related":13,"type":24,"origin":102,"createTime":26},198418977,"v1","从图中,想打开定时器TIM2的中断,应该操作\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fcc8b4c8e9c599822c59b9c1ea1a5471d.png\">",[8,9,10,11],"Parameter Setings","User constant","NVIC setings","DMA setings",[],[14,27,31,41,50,60,68,74,84,93],{"id":15,"source":5,"question":16,"options":17,"answer":22,"related":23,"type":24,"origin":25,"createTime":26},198418974,"STM32cubeMX工程文件的扩展名是",[18,19,20,21],".c",".h",".hex",".ioc",[],[],0,null,"2025-06-11T15:00:10+08:00",{"id":4,"source":5,"question":6,"options":28,"answer":29,"related":30,"type":24,"origin":25,"createTime":26},[8,9,10,11],[],[],{"id":32,"source":5,"question":33,"options":34,"answer":39,"related":40,"type":24,"origin":25,"createTime":26},198418980,"图中自动重装主计数器是\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fb53e5bd1deea4f4198636c23a0210bc9.png\">",[35,36,37,38],"Prescaler (PSC- 16 bits value)","Counter Mode","Counter Period (AutoReload Register- 16 bits value )","Internal Clock Division (CKD)",[],[],{"id":42,"source":5,"question":43,"options":44,"answer":48,"related":49,"type":24,"origin":25,"createTime":26},198418983,"void SystemClock_Config(void);static void MX_GPIO_Init(void);static void MX_TIM3_Init(void);哪条语句是完成定时器3的初始化",[45,46,47],"void SystemClock_Config(void)","static void MX_GPIO_Init(void)","static void MX_TIM3_Init(void)",[],[],{"id":51,"source":5,"question":52,"options":53,"answer":58,"related":59,"type":24,"origin":25,"createTime":26},198418984,"假设tim3的时钟频率是8MHz,则这段程序使得tim3的定时时间为 htim3.Instance = TIM3; htim3.Init.Prescaler = 7999; htim3.Init.CounterMode = TIM_COUNTERMODE_UP; htim3.Init.Period = 599; htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE",[54,55,56,57],"1s","0.1s","0.6s","0.2s",[],[],{"id":61,"source":5,"question":62,"options":63,"answer":66,"related":67,"type":24,"origin":25,"createTime":26},198418985,"想让tim3像火箭发射前的倒计时10,9,8,7,6,5,4,3,2,1,0,发射!那样,则htim3.Init.CounterMode = ()",[64,65],"TIM_COUNTERMODE_UP","TIM_COUNTERMODE_DOWN",[],[],{"id":69,"source":5,"question":70,"options":71,"answer":72,"related":73,"type":24,"origin":25,"createTime":26},198418987,"想让tim3像捉迷藏找人前的计时1,2,3,4,5,6,7,8,9,10藏好了吗?开始找了啊!那样,则htim3.Init.CounterMode = ()",[64,65],[],[],{"id":75,"source":5,"question":76,"options":77,"answer":82,"related":83,"type":24,"origin":25,"createTime":26},198418989,"定时器3的中断服务程序是",[78,79,80,81],"TIM3_IRQHandler(void)","EXTI3_IRQHandler(void)","USART3_IRQHandler(void)","DMA3_IRQHandler(void)",[],[],{"id":85,"source":5,"question":86,"options":87,"answer":91,"related":92,"type":24,"origin":25,"createTime":26},198418991,"void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){ if(htim->Instance==TIM2) { HAL_GPIO_TogglePin(LED1_GPIO_Port,LED1_Pin); } if(htim->Instance==TIM3) { HAL_GPIO_TogglePin(LED0_GPIO_Port,LED0_Pin); }}说法不正确的是",[88,89,90],"这个函数的内容是cube自动生成的","这个函数的内容需要用户自己编写","callback代表回调函数",[],[],{"id":94,"source":5,"question":95,"options":96,"answer":99,"related":100,"type":101,"origin":25,"createTime":26},198418993,"定时器TIM3配置成功,也打开了TIM3,但是定时时间到,程序没有任何反应,则可能",[97,98],"TIM3 的中断未打开","TIM3的中断回调函数callback没写内容",[],[],1,{"courseName":103,"courseImg":104,"workName":105,"workId":106,"count":107,"courseId":108},"默认课程","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","3.1 定时器 -cube操作与指令","work_42350429",10,"53e1d2ef4961cca8eea3e23969ad2cb9"]