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2374688_zh-CN
2374688_zh-CN
您好：
我现在使用IPWM模式去测量外部的PWM脉冲，实际测试中我发现当我满足测量低频的PWM信号要求时几HZ的频率，测量高频的PWM信号误差会非常的大，当满足高频信号的测量精度，则测量低频信号会出现溢出事件，有没有什么办法可以让我同时满足低频和高频PWM脉冲的测量。希望能得到些许建议。
IPWM 定时器值为 16 位 65536。因此，您可能需要更改 5Hz 和 30KHz 的值设置，因为 5Hz 和 30KHz 之间的动态频率范围相当大
当我实现稳定采集3-10HZ的PWM脉冲，测量30KHZ甚至40KHZ时误差可能会超过20%
我现在想要实现5HZ-30KHZ的PWM脉冲采集（占空比50%），当前配置我获取到的5HZ情况下的周期为50000所以我的相对应的时钟频率大致为250000此时我采集30KHZ的PWM脉冲获取的周期为8，9，此时换算过来频率为27777-31250，误差是比较大的如果我想提高采集精度就需要减小Clock Divider Value;Master Bus Prescaler;Master Bus Alternate Prescaler的值，相应的当测量5HZ时就可能会出现溢出事件，不知道我的理解是否正确。
Hi@xuanming
请看一下这个帖子，如果还有任何问题，请告诉我、
https://community.nxp.com/t5/S32M-Knowledge-Base/S32M27x-S32K3-eMIOS-Usage/ta-p/2129760
PWM 测量误差有多大？在测量 PWM 脉冲宽度（例如预分频器值等）时，您可能需要检查所依赖的计数器总线通道。
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