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发表于 2016-7-26 10:49:03
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这个程序确实好用，必须精华贴。用TIM2_CH1的程序如下，测试1K,2K,3K信号占空比准确，
占空比是IC2 捕获，周期是IC1捕获，这块注意一下就行，还有前2到3次测量结果不准确要抛弃。
//----------------------PWM输入模式配置--------------------------------------------------
void TIM2_PWMINPUT_INIT(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM2_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PB7:TIM4_CH2
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0: TIM2_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //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(TIM2, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
// TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2;
// TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
// TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
// TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
// TIM4_ICInitStructure.TIM_ICFilter = 0x0;
//初始化TIM2输入捕获参数
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
TIM_ICInit(TIM2, &TIM2_ICInitStructure);
/*配置中断优先级*/
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// TIM_PWMIConfig(TIM4, &TIM4_ICInitStructure); //PWM输入配置
// 这个是选择有效的输入端 ，我这里TIM_TS_TI2FP2选择的PB7，注意：只有TI1FP1和TI2FP2连到了从模式控制器，所以PWM输入模式只能使用TIMx_CH1 /TIMx_CH2信号
// TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2); //选择有效输入端
// 这个是配置为PWM输入主从复位模式，就是每次输入端有效电平变化的时候定时器计数器就会硬件上置0
// TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset); //配置为主从复位模式
// TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable);
// TIM_ITConfig(TIM4, TIM_IT_CC2|TIM_IT_Update, ENABLE); //中断配置
// TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); //清除中断标志位
// TIM_Cmd(TIM4, ENABLE);
TIM_PWMIConfig(TIM2, &TIM2_ICInitStructure); //PWM输入配置
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1); //选择有效输入端
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); //配置为主从复位模式
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
TIM_ITConfig(TIM2, TIM_IT_CC1|TIM_IT_Update, ENABLE); //中断配置
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //允许更新中断 ,允许CC1IE捕获中断
TIM_Cmd(TIM2, ENABLE);
}
u16 period = 0;
u16 DUTY = 0;
u8 CollectFlag = 1;
void TIM2_IRQHandler(void)
{
if(CollectFlag)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
period = TIM_GetCapture1(TIM2); //采集周期
DUTY = TIM_GetCapture2(TIM2); //采集占空比
}
CollectFlag = 0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位
}
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谢谢
