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- 2023-7-26
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用输入捕获的例程,想改成多通道。
跑例程的时候用PA0通道1可以正常工作,然后想单独改成PA1通道2测试的时候,可以进中断,但是感觉很不稳定,每次数据也接收不完整,是不是有地方改错了,请各位大神指点
void TIM2_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA0 上拉输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIO_ResetBits(GPIOA,GPIO_Pin_0); //PA0
//初始化定时器2 TIM2
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(TIM2, &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_Falling; //下降沿捕获
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);
//初始化TIM2输入捕获参数
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 选择输入端 IC1映射到TI1上
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //下降沿捕获
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);
//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //先占优先级1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(TIM2,TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断 【测试时用于切换】
TIM_ITConfig(TIM2,TIM_IT_CC2,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
TIM_Cmd(TIM2,ENABLE ); //使能定时器2
}
//定时器2中断服务程序
void TIM2_IRQHandler(void)
{
//捕获1发生捕获事件
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET) //捕获1发生捕获事件 //判断是否发生捕获事件
{
if(!TIM2CH1_CAPTURE_Down) //捕获到下降沿
{
TIM2CH1_CAPTURE_Down=1; //等待捕获上升沿
TIM2CH1_CAPTURE_Up=0; //上升沿状态清零
TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=1 设置为上升沿捕获
}
else if(TIM2CH1_CAPTURE_Down) //捕获到上升沿
{
TIM2CH1_CAPTURE_Down=0; //等待捕获下降沿
TIM2CH1_CAPTURE_Up=1; //捕获到上升沿
LED0=!LED0;
ArrayCH1[CH1NUM_BITS++] = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4); //数据线
TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=0 设置为下降沿捕获
}
}
//捕获1发生捕获事件
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) //捕获1发生捕获事件 //判断是否发生捕获事件
{
if(!TIM2CH1_CAPTURE_Down) //捕获到下降沿
{
TIM2CH1_CAPTURE_Down=1; //等待捕获上升沿
TIM2CH1_CAPTURE_Up=0; //上升沿状态清零
TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=1 设置为上升沿捕获
}
else if(TIM2CH1_CAPTURE_Down) //捕获到上升沿
{
TIM2CH1_CAPTURE_Down=0; //等待捕获下降沿
TIM2CH1_CAPTURE_Up=1; //捕获到上升沿
LED0=!LED0;
ArrayCH1[CH1NUM_BITS++] = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_5); //数据线
TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=0 设置为下降沿捕获
}
}
//清除中断标志位
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_CC2); //清除中断标志位
}
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