PWM采集计算周期，电机转速计算

发表于 2023-9-19 13:04

TIM2配置：

timer.h

#if FAN_PWM_Count
extern unsigned char  TIM2CH1_CAPTURE_STA; //输入捕获状态
extern unsigned int  TIM2CH1_CAPTURE_Count; //输入捕获溢出计数
extern long long TIM2CH1_CAPTURE_VAL; //输入捕获值
extern long long TIM2CH1_CAPTURE_HIGHVAL;
extern unsigned long int TIM2_ARR;
#endif

timer.c

#if FAN_PWM_Count
unsigned char  TIM2CH1_CAPTURE_STA; //输入捕获状态
unsigned int  TIM2CH1_CAPTURE_Count; //输入捕获溢出计数
long long TIM2CH1_CAPTURE_VAL; //输入捕获值  一个周期捕获值
long long TIM2CH1_CAPTURE_HIGHVAL; //一个周期高电频的值
unsigned long int TIM2_ARR = 0xFFFF;
#endif

timer.c重定义HAL_TIM_IC_CaptureCallback
HAL_TIM_PeriodElapsedCallback

#if FAN_PWM_Count
/* Input capture event */
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim){
if(htim ->Instance == TIM2){
if(!(TIM2CH1_CAPTURE_STA&0X80))//还未成功捕获
{
if(TIM2CH1_CAPTURE_STA&0x20)          //捕获到第二个下降沿
{
__HAL_TIM_DISABLE(&htim2);
TIM2CH1_CAPTURE_STA|=0X80;
TIM2CH1_CAPTURE_VAL = HAL_TIM_ReadCapturedValue(&htim2,TIM_CHANNEL_1);
TIM2CH1_CAPTURE_VAL = TIM2CH1_CAPTURE_VAL + 2 + TIM2_ARR*TIM2CH1_CAPTURE_Count - TIM2CH1_CAPTURE_HIGHVAL;//获取当前的捕获值.//+ (TIM2CH1_CAPTURE_STA&0X1F - 1)*TIM2_ARR
if(TIM2CH1_CAPTURE_HIGHVAL>TIM2CH1_CAPTURE_VAL)
TIM2CH1_CAPTURE_HIGHVAL-=TIM2CH1_CAPTURE_VAL;
else if(TIM2CH1_CAPTURE_HIGHVAL==TIM2CH1_CAPTURE_VAL)
TIM2CH1_CAPTURE_HIGHVAL=0;
//一定要先清除原来的设置！！
//配置TIM5通道1上升沿捕获
__HAL_TIM_SET_CAPTUREPOLARITY(&htim2, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_RISING);
}
else if(TIM2CH1_CAPTURE_STA&0X40) //捕获到第一个下降沿
{
TIM2CH1_CAPTURE_STA|=0X20; //标记成功捕获到一次高电平脉宽
TIM2CH1_CAPTURE_HIGHVAL = HAL_TIM_ReadCapturedValue(&htim2,TIM_CHANNEL_1);
TIM2CH1_CAPTURE_VAL = 0;
TIM2CH1_CAPTURE_HIGHVAL = TIM2CH1_CAPTURE_HIGHVAL + 2 + TIM2_ARR*TIM2CH1_CAPTURE_Count; //  消除误差

}
else                   //还未开始,第一次捕获上升沿
{
TIM2CH1_CAPTURE_STA=0;    //清空
TIM2CH1_CAPTURE_HIGHVAL = 0;
TIM2CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
__HAL_TIM_DISABLE(&htim2);       //关闭定时器5
__HAL_TIM_SET_COUNTER(&htim2,0);
//一定要先清除原来的设置！！
__HAL_TIM_SET_CAPTUREPOLARITY(&htim2, TIM_CHANNEL_1, TIM_INPUTCHANNELPOLARITY_FALLING);//定时器5通道1设置为下降沿捕获
__HAL_TIM_ENABLE(&htim2);       //使能定时器5
}

}
}
}
#endif

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim ->Instance == TIM2) {
if((TIM2CH1_CAPTURE_STA&0X80)==0) //还未成功捕获
{
if(TIM2CH1_CAPTURE_STA&0X40 || TIM2CH1_CAPTURE_STA&0X20) //已经捕获到高电平了
{
if(TIM2CH1_CAPTURE_Count == 0xFFFF) //高电平太长了
{
TIM2CH1_CAPTURE_STA|=0X80; //标记成功捕获了一次
TIM2CH1_CAPTURE_VAL = 0XFFFFFFFF;
}
else {
TIM2CH1_CAPTURE_Count++;
}
}
}
}
}

main()使能timer调取TIM2CH1_CAPTURE_VAL
TIM2CH1_CAPTURE_HIGHVAL
计算频率

HAL_TIM_Base_Start_IT(&htim2);

uiFanSpeed = 60*(Tim2_Chn1_CountSUM/TIM2CH1_CAPTURE_VAL)/2;
//计算风扇转速  N = 60*f/P; p = 2; f = TIM2CH1_CAPTURE_VAL/

完整代码块：

if(TIM2CH1_CAPTURE_STA&0X80)       //成功捕获到了一次高电平 TIM2CH1_CAPTURE_STA = 0x80
{
      uiFanSpeed = 60*(Tim2_Chn1_CountSUM/TIM2CH1_CAPTURE_VAL)/2;//计算风扇转速  N = 60*f/P; p = 2; f = TIM2CH1_CAPTURE_VAL/
      TIM2CH1_CAPTURE_STA=0;
      TIM2CH1_CAPTURE_Count = 0;
      __HAL_TIM_ENABLE(&htim2);       //使能定时器5
}
————————————————
版权声明：本文为CSDN博主「明东(Maxwell)」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/Maxwell_321/article/details/129043725

发表于 2023-9-19 23:01

这个计算原理是什么啊？

[应用相关] PWM采集计算周期，电机转速计算

相关帖子

浏览过的版块

十世金身

技术领袖奖章

坚毅之洋流

终身成就奖章