STM32笔记：定时器向上溢出示例代码

mameng · 发表于 2015-5-19 10:43:26

以下是定时器向上溢出示例代码：

C语言: TIM1模块产生向上溢出事件
//Step1.时钟设置：启动TIM1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

//Step2.中断NVIC设置：允许中断，设置优先级
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQChannel;    //更新事件
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;          //响应优先级1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;             //允许中断
NVIC_Init(&NVIC_InitStructure);                            //写入设置

//Step3.TIM1模块设置
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

//TIM1 使用内部时钟
//TIM_InternalClockConfig(TIM1);

//TIM1基本设置
//设置预分频器分频系数71，即APB2=72M, TIM1_CLK=72/72=1MHz
//TIM_Period（TIM1_ARR）=1000，计数器向上计数到1000后产生更新事件，计数值归零
//向上计数模式
//TIM_RepetitionCounter(TIM1_RCR)=0，每次向上溢出都产生更新事件
TIM_BaseInitStructure.TIM_Period = 1000;
TIM_BaseInitStructure.TIM_Prescaler = 71;
TIM_BaseInitStructure.TIM_ClockDivision = 0;
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);

//清中断，以免一启用中断后立即产生中断
TIM_ClearFlag(TIM1, TIM_FLAG_Update);
//使能TIM1中断源
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);

//TIM1总开关：开启
TIM_Cmd(TIM1, ENABLE);
}

//Step4.中断服务子程序：
void TIM1_UP_IRQHandler(void)
{
GPIOC->ODR ^= (1<<4); //闪灯
TIM_ClearITPendingBit(TIM1, TIM_FLAG_Update); //清中断
}

下面是输出比较功能实现TIM1_CH1管脚输出指定频率的脉冲：

C语言: TIM1模块实现输出比较，自动翻转并触发中断
//Step1.启动TIM1,同时还要注意给相应功能管脚启动时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

//Step2. PA.8口设置为TIM1的OC1输出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//Step3.使能TIM1的输出比较匹配中断
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//Step4. TIM模块设置
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

   //TIM1基本计数器设置
   TIM_BaseInitStructure.TIM_Period = 0xffff;                      //这里必须是65535
   TIM_BaseInitStructure.TIM_Prescaler = 71;                      //预分频71，即72分频，得1M
   TIM_BaseInitStructure.TIM_ClockDivision = 0;
   TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
   TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
   TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);

   //TIM1_OC1模块设置
   TIM_OCStructInit(& TIM_OCInitStructure);
   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;             //管脚输出模式：翻转
   TIM_OCInitStructure.TIM_Pulse = 2000;                         //翻转周期：2000个脉冲
   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //使能TIM1_CH1通道
   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       //输出为正逻辑
   TIM_OC1Init(TIM1, &TIM_OCInitStructure);                      //写入配置

//清中断
TIM_ClearFlag(TIM1, TIM_FLAG_CC1);

//TIM1中断源设置，开启相应通道的捕捉比较中断
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);

   //TIM1开启
   TIM_Cmd(TIM1, ENABLE);
   //通道输出使能
   TIM_CtrlPWMOutputs(TIM1, ENABLE);
}