82 lines
3.2 KiB
C
82 lines
3.2 KiB
C
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#include "stm32f10x.h" // Device header
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struct {uint16_t Value; uint16_t Count;} FreqCounter = {0, 0}; //帧率相关结构体并直接实例化
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/**
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* 函 数：定时中断初始化
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* 参 数：无
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* 返 回 值：无
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*/
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void Timer_Init(void)
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{
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/*开启时钟*/
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //开启TIM4的时钟
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/*配置时钟源*/
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TIM_InternalClockConfig(TIM4); //选择TIM4为内部时钟，若不调用此函数，TIM默认也为内部时钟
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/*时基单元初始化*/
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TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; //定义结构体变量
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TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频，选择不分频，此参数用于配置滤波器时钟，不影响时基单元功能
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TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器模式，选择向上计数
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TIM_TimeBaseInitStructure.TIM_Period = 10000 - 1; //计数周期，即ARR的值
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TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1; //预分频器，即PSC的值
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TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0; //重复计数器，高级定时器才会用到
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TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStructure); //将结构体变量交给TIM_TimeBaseInit，配置TIM4的时基单元
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/*中断输出配置*/
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TIM_ClearFlag(TIM4, TIM_FLAG_Update); //清除定时器更新标志位
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//TIM_TimeBaseInit函数末尾，手动产生了更新事件
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//若不清除此标志位，则开启中断后，会立刻进入一次中断
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//如果不介意此问题，则不清除此标志位也可
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TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE); //开启TIM4的更新中断
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/*NVIC中断分组*/
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //配置NVIC为分组2
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//即抢占优先级范围：0~3，响应优先级范围：0~3
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//此分组配置在整个工程中仅需调用一次
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//若有多个中断，可以把此代码放在main函数内，while循环之前
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//若调用多次配置分组的代码，则后执行的配置会覆盖先执行的配置
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/*NVIC配置*/
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NVIC_InitTypeDef NVIC_InitStructure; //定义结构体变量
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NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //选择配置NVIC的TIM4线
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //指定NVIC线路使能
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //指定NVIC线路的抢占优先级为2
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //指定NVIC线路的响应优先级为1
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NVIC_Init(&NVIC_InitStructure); //将结构体变量交给NVIC_Init，配置NVIC外设
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/*TIM使能*/
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TIM_Cmd(TIM4, ENABLE); //使能TIM4，定时器开始运行
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}
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uint8_t Timer_GetFPS(void) //获取帧率
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{
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FreqCounter.Count++;
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return FreqCounter.Value;
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}
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void Timer_SetFreqCounter(void) //放置计数器
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{
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FreqCounter.Count++;
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}
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uint8_t Timer_GetFreqCounter(void) //获取计数频率
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{
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return FreqCounter.Value;
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}
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// /* 定时器中断函数，可以复制到使用它的地方
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void TIM4_IRQHandler(void)
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{
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if (TIM_GetITStatus(TIM4, TIM_IT_Update) == SET)
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{
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FreqCounter.Value = FreqCounter.Count;
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FreqCounter.Count = 0;
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TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
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}
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}
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// */
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