filter.c File Reference

this file contains the code implementation of first-order digital RC low-pass filter algorithm and the code implementation of low-pass filter coefficient calculation. More...

#include "filter.h"
#include "system.h"
#include "foc.h"
#include "config.h"

Go to the source code of this file.

Functions
void	filter_coefficient_config (Filter_Structure_t *param, float cutoff_freq, float sample_freq, float coefficient)
	configure low-pass filter parameters More...
void	filter_config (void)
	configure low-pass filter parameters More...
float	filter_update_value (Filter_Structure_t *param, short value)
	update the output value of the first-order low-pass filter More...

Variables
volatile Filter_Structure_t	velocity_filter
	motor rotation speed low pass filter handle More...

Detailed Description

this file contains the code implementation of first-order digital RC low-pass filter algorithm and the code implementation of low-pass filter coefficient calculation.

Author

Lao·Zhu

Version

V1.0.2

Date

29. October 2021

Definition in file filter.c.

Function Documentation

filter_coefficient_config()

void filter_coefficient_config	(	Filter_Structure_t *	param,
		float	cutoff_freq,
		float	sample_freq,
		float	coefficient
	)

configure low-pass filter parameters

Parameters

[in]	param	first order low pass filter parameter handler
[in]	cutoff_freq	cut off frequency in Hz
[in]	sample_freq	sample frequency in Hz
[in]	coefficient	input data weight, usually is 1

Definition at line 28 of file filter.c.

References Filter_Structure_t::coefficient1, Filter_Structure_t::coefficient2, Filter_Structure_t::current_result, Filter_Structure_t::last_result, and user_memset().

Referenced by filter_config().

filter_config()

void filter_config

(

void

)

configure low-pass filter parameters

Definition at line 45 of file filter.c.

References filter_coefficient_config(), SPEED_COEFFICIENT, SPEED_UP_FREQ, TIM13_FREQUENCY, and velocity_filter.

Referenced by main().

filter_update_value()

float filter_update_value	(	Filter_Structure_t *	param,
		short	value
	)

update the output value of the first-order low-pass filter

Parameters

[in]	param	first order low pass filter parameter handler
[in]	value	the sampled value to be filtered at this moment

Return values

current

calculation results of low-pass filter

Definition at line 56 of file filter.c.

References Filter_Structure_t::coefficient1, Filter_Structure_t::coefficient2, Filter_Structure_t::current_result, and Filter_Structure_t::last_result.

Referenced by encoder_update_speed().

Variable Documentation

velocity_filter

volatile Filter_Structure_t velocity_filter

motor rotation speed low pass filter handle

Definition at line 19 of file filter.c.

Referenced by encoder_update_speed(), and filter_config().