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//定时器4通道3 输入捕获配置
TIM_ICInitTypeDef TIM4_ICInitStructure;
void TIM4_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //使能TIM4时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能GPIOA时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PB8 PB9 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PB8 PB9 输入
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_8); //PB8 PB9 下拉
//初始化定时器4 TIM4
TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//初始化TIM4输入捕获参数
TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3; //CC3S=01 选择输入端 IC1映射到TI1上
TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM4_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 配置输入滤波器 不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM4中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
TIM_ITConfig(TIM4,TIM_IT_Update|TIM_IT_CC3,ENABLE); //允许更新中断 ,允许CC3IE CC4IE捕获中断
TIM_Cmd(TIM4,ENABLE ); //使能定时器4
}
u8 TIM4CH3_CAPTURE_STA=0; //输入捕获状态
u16 TIM4CH3_CAPTURE_VAL; //输入捕获值
//定时器4中断服务程序
void TIM4_IRQHandler(void)
{
if((TIM4CH3_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
if(TIM4CH3_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM4CH3_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM4CH3_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM4CH3_CAPTURE_VAL=0XFFFF;
}
else
{
TIM4CH3_CAPTURE_STA++;
}
}
}
if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET)//捕获3发生捕获事件
{
if(TIM4CH3_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM4CH3_CAPTURE_STA|=0X80; //标记成功捕获到一次高电平脉宽
TIM4CH3_CAPTURE_VAL=TIM_GetCapture3(TIM4);
TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC3P=0 设置为上升沿捕获 TIM_Channel_3
}else //还未开始,第一次捕获上升沿
{
TIM4CH3_CAPTURE_STA=0; //清空
TIM4CH3_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH3_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC3P=1 设置为下降沿捕获 TIM_Channel_3
}
}
}
TIM_ClearITPendingBit(TIM4, TIM_IT_Update|TIM_IT_CC3); //清除中断标志位 TIM_IT_CC3
}
下面是主函数测量脉冲宽度
if(TIM4CH3_CAPTURE_STA&0X80)//成功捕获到了一次上升沿
{
temp=TIM4CH3_CAPTURE_STA&0X3F;
temp*=65536;//溢出时间总和
temp+=TIM4CH3_CAPTURE_VAL; //得到总的高电平时间
if (B_VI_Test_Mode == 0)
{
U32_I_CURRENT_PLUSEWIDTH_TIME = 2*temp;
}
else
{
U32_V_CURRENT_PLUSEWIDTH_TIME = 2*temp;
}
TIM4CH3_CAPTURE_STA=0; //开启下一次捕获
}
我测脉宽仿真时,发现进入不了定时器的更新中断,只能进入捕捉事件中断,找了好久没找到什么原因,找安富莱的例程,没看到说如捕捉的例程在哪个地方?
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发表于 2019-5-6 09:22:27
发表于 2019-5-6 12:10:29
楼主
