Implementation of macro instruction of first-order RC low-pass filter in signal processing (easy touch screen)

About RC Low pass filter PLC Algorithm details , You can refer to other blogs ：

PLC One of the signal processing series, low-pass (RC) Filter algorithm _RXXW_Dor The blog of -CSDN Blog _rc Low pass digital filtering 1、 Have a look first RC Advantages and disadvantages of filtering advantage ： Digital filtering algorithm is used to realize dynamic filtering RC wave filtering , It can overcome the shortcomings of analog filter ; 1、 This algorithm is more practical when the simulation constant is required ; 2、 It has a good inhibitory effect on periodic interference , 3、 It's more economical RAM Space shortcoming ： The disadvantage is that it brings phase lag , Resulting in low sensitivity ; At the same time, it can not filter the frequency higher than half of the sampling frequency （ It's called the Nyquist frequency ） Interference of （ For example, the sampling frequency is 100Hz, Then it cannot filter out 50Hz The above interference signals ） For interference above Nyquist frequency ........................https://blog.csdn.net/m0_46143730/article/details/123755877

1、HMI Test interface