/*
Copyright 2016 - 2022 Benjamin Vedder benjamin@vedder.se
Copyright 2022 Marcos Chaparro mchaparro@powerdesigns.ca
Copyright 2022 Jakub Tomczak
This file is part of the VESC firmware.
The VESC firmware is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The VESC firmware is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
#include "encoder/ENC_SINCOS.h"
#include "ch.h"
#include "hal.h"
#include "stm32f4xx_conf.h"
#include "mc_interface.h"
#include "utils.h"
#include
#include "hw.h"
//TODO move defines to encoder_hwconf.h
#define SINCOS_SAMPLE_RATE_HZ 20000
#define SINCOS_MIN_AMPLITUDE 1.0 // sqrt(sin^2 + cos^2) has to be larger than this
#define SINCOS_MAX_AMPLITUDE 1.65 // sqrt(sin^2 + cos^2) has to be smaller than this
ENCSINCOS_config_t enc_sincos_config_now = { 0 };
static uint32_t sincos_signal_below_min_error_cnt = 0;
static uint32_t sincos_signal_above_max_error_cnt = 0;
static float sincos_signal_low_error_rate = 0.0;
static float sincos_signal_above_max_error_rate = 0.0;
static float last_enc_angle = 0.0;
void ENC_SINCOS_deinit(void) {
last_enc_angle = 0.0;
sincos_signal_low_error_rate = 0.0;
sincos_signal_above_max_error_rate = 0.0;
enc_sincos_config_now.is_init = 0;
}
encoder_ret_t ENC_SINCOS_init(ENCSINCOS_config_t *enc_sincos_config) {
enc_sincos_config_now = *enc_sincos_config;
sincos_signal_below_min_error_cnt = 0;
sincos_signal_above_max_error_cnt = 0;
sincos_signal_low_error_rate = 0.0;
sincos_signal_above_max_error_rate = 0.0;
last_enc_angle = 0.0;
enc_sincos_config->is_init = 1;
enc_sincos_config_now = *enc_sincos_config;
return ENCODER_OK;
}
float ENC_SINCOS_read_deg(void) {
float angle = 0.0;
float sin = ENCODER_SIN_VOLTS * enc_sincos_config_now.s_gain - enc_sincos_config_now.s_offset;
float cos = ENCODER_COS_VOLTS * enc_sincos_config_now.c_gain - enc_sincos_config_now.c_offset;
float module = SQ(sin) + SQ(cos);
if (module > SQ(SINCOS_MAX_AMPLITUDE) ) {
// signals vector outside of the valid area. Increase error count and discard measurement
++sincos_signal_above_max_error_cnt;
UTILS_LP_FAST(sincos_signal_above_max_error_rate, 1.0, 1./SINCOS_SAMPLE_RATE_HZ);
angle = last_enc_angle;
} else {
if (module < SQ(SINCOS_MIN_AMPLITUDE)) {
++sincos_signal_below_min_error_cnt;
UTILS_LP_FAST(sincos_signal_low_error_rate, 1.0, 1./SINCOS_SAMPLE_RATE_HZ);
angle = last_enc_angle;
} else {
UTILS_LP_FAST(sincos_signal_above_max_error_rate, 0.0, 1./SINCOS_SAMPLE_RATE_HZ);
UTILS_LP_FAST(sincos_signal_low_error_rate, 0.0, 1./SINCOS_SAMPLE_RATE_HZ);
float angle_tmp = RAD2DEG_f(utils_fast_atan2(sin, cos));
UTILS_LP_FAST(angle, angle_tmp, enc_sincos_config_now.filter_constant);
last_enc_angle = angle;
}
}
return last_enc_angle;
}
uint32_t ENC_SINCOS_get_signal_below_min_error_cnt(void) {
return sincos_signal_below_min_error_cnt;
}
uint32_t ENC_SINCOS_get_signal_above_max_error_cnt(void) {
return sincos_signal_above_max_error_cnt;
}
float ENC_SINCOS_get_signal_below_min_error_rate(void) {
return sincos_signal_low_error_rate;
}
float ENC_SINCOS_get_signal_above_max_error_rate(void) {
return sincos_signal_above_max_error_rate;
}