MC100/Applications/foc/motor/encoder.c

#include "bsp/bsp.h"
#include "bsp/bsp_driver.h"
#include "foc/motor/encoder.h"
#include "foc/motor/motor_param.h"
#include "libs/logger.h"
#include "app/nv_storage.h"
#include "math/fast_math.h"
#if CONFIG_MOT_TYPE==MOTOR_BLUESHARK_OLD
#include "encoder_off2.h"
#elif CONFIG_MOT_TYPE==MOTOR_BLUESHARK_NEW1
#include "encoder_off3.h"
#elif CONFIG_MOT_TYPE==MOTOR_BLUESHARK_NEW2
#if ENCODER_TYPE==ENCODER_MPS
#include "encoder_off4.h"
#endif
#elif CONFIG_MOT_TYPE==MOTOR_BLUESHARK_ZD_100
#if ENCODER_TYPE==ENCODER_MPS
#include "encoder_off5.h"
#endif
#endif

/* 磁编码器使用一对极的磁铁，所以编码器获取的角度和机械角度相同需要转为电角度*/

encoder_t g_encoder;

static __INLINE u32 _abi_count(void) {
#ifdef ENCODER_CC_INVERT
	return (g_encoder.cpr - ENC_COUNT);
#else
	return ENC_COUNT;
#endif
}

static __INLINE void encoder_pll_update_gain(void) {
	if (g_encoder.pll_bandwidth_shadow != g_encoder.pll_bandwidth) {
		g_encoder.pll_bandwidth = g_encoder.pll_bandwidth_shadow;
		g_encoder.est_pll.kp = 2.0f * g_encoder.pll_bandwidth;
		g_encoder.est_pll.ki = 0.25f * g_encoder.est_pll.kp * g_encoder.est_pll.kp;		
	}
}

static void _init_pll(void) {
	g_encoder.est_pll.DT = FOC_CTRL_US;
	g_encoder.est_pll.max_wp = g_encoder.cpr;
	g_encoder.pll_bandwidth = 0;
	g_encoder.pll_bandwidth_shadow = nv_get_motor_params()->est_pll_band;
	encoder_pll_update_gain();
	PLL_Reset(&g_encoder.est_pll, (float)_abi_count());
}


void encoder_init(void) {
	encoder_init_clear();
	enc_intf_init(ENC_MAX_RES);
}

void encoder_set_direction(s8 direction) {
	g_encoder.direction = direction;
	//g_encoder.cali_angle = INVALID_ANGLE;
}

void encoder_set_bandwidth(float bandwidth) {
	g_encoder.pll_bandwidth_shadow = bandwidth;
}

void encoder_init_clear(void) {
	g_encoder.cpr = ENC_MAX_RES;
	g_encoder.enc_offset = 0;
	g_encoder.motor_poles = nv_get_motor_params()->poles;
	g_encoder.b_index_found = false;
	g_encoder.direction = POSITIVE;
	g_encoder.abi_angle = 0.0f;
	g_encoder.pwm_angle = 0.0f;
	g_encoder.est_angle_counts = 0;
	g_encoder.est_vel_counts = 0;
	g_encoder.position = 0.0f;
	g_encoder.interpolation = 0.0f;
	//g_encoder.cali_angle = INVALID_ANGLE;
	g_encoder.enc_count_off = 0xFFFFFFFF;
	g_encoder.b_cali_err = false;
	g_encoder.produce_error = false;
	g_encoder.last_delta_cnt = MAX_S16;
	g_encoder.enc_maybe_err = false;
	g_encoder.start_dianostic_cnt = 0;
	g_encoder.pwm_time_ms = get_tick_ms();
	_init_pll();
}

void encoder_lock_position(bool enable) {
	if (g_encoder.b_lock_pos != enable) {
		g_encoder.b_lock_pos = enable;
		if (enable) {
			encoder_set_bandwidth(nv_get_motor_params()->pos_lock_pll_band);
		}else {
			encoder_set_bandwidth(nv_get_motor_params()->est_pll_band);
		}
	}
}

void encoder_epm_pll_band(bool epm) {
	if (epm) {
		encoder_set_bandwidth(nv_get_motor_params()->epm_pll_band);
	}else {
		encoder_set_bandwidth(nv_get_motor_params()->est_pll_band);
	}
}

static __INLINE float _pll_over_comp(void) {
	u8 dir = ENC_DIR_DOWN;
#ifdef ENCODER_CC_INVERT
	dir = ENC_DIR_UP;
#endif
	if(ENC_Direction() == dir){
		return -((float)g_encoder.cpr);
	}
	return (float)g_encoder.cpr;
}

static __INLINE bool encoder_run_pll(float cnt) {
	float pll_comp = 0.0f;
	if (g_encoder.b_timer_ov) {
		pll_comp = _pll_over_comp();
		g_encoder.b_timer_ov = false;
	}
	encoder_pll_update_gain();
	g_encoder.est_vel_counts = PLL_run(&g_encoder.est_pll, cnt, pll_comp);
	g_encoder.est_angle_counts = g_encoder.est_pll.observer;
    bool snap_to_zero_vel = false;
    if (ABS(g_encoder.est_pll.out) < 0.5f * g_encoder.est_pll.DT * g_encoder.est_pll.ki) {
        g_encoder.est_vel_counts = g_encoder.est_pll.out = 0.0f;  // align delta-sigma on zero to prevent jitter
        snap_to_zero_vel = true;
    }
	return snap_to_zero_vel;
}

/* 偏心补偿 */
static __INLINE float _eccentricity_compensation(int cnt) {
#ifdef FIR_PHASE_SHIFT
	int cnt_off = (cnt + FIR_PHASE_SHIFT);//g_encoder.cpr;
	if (g_encoder.encoder_off_map != NULL) { //do offset calibrate, can not do encentricity compensation
		return 0.0f;
	}
	return -(S16Q10toF(_encoder_off_map[cnt_off]));
#else
	return 0.0f;
#endif
}

#define CONFIG_ENC_DIANOSTIC_MIN_CNT (10.0F * ENC_MAX_RES * FOC_CTRL_US) //600rpm

static void encoder_detect_error(u32 cnt) {
#ifdef CONFIG_ENC_DETECT_ERR
	if (!g_encoder.enc_maybe_err) {
		s16 delta_cnt = cnt - g_encoder.last_cnt;
		bool skip = false;
		if (g_encoder.b_timer_ov) {
			delta_cnt = (cnt + ENC_MAX_RES) - g_encoder.last_cnt;
		}
#ifdef CONFIG_ENC_ERR_TEST
		if (g_encoder.produce_error) {
			delta_cnt = 0;
		}
#endif
		if (g_encoder.last_delta_cnt == MAX_S16) {
			g_encoder.last_delta_cnt = delta_cnt;
			skip = true;
		}
		if ((g_encoder.last_delta_cnt <= CONFIG_ENC_DIANOSTIC_MIN_CNT*1.2f) && get_delta_ms(g_encoder.pwm_time_ms) >= 4) {
			g_encoder.enc_maybe_err = true;
		}
		if (g_encoder.start_dianostic_cnt < 0xFFFF) {
			g_encoder.start_dianostic_cnt ++;
		}
		if (!skip && (g_encoder.last_delta_cnt > CONFIG_ENC_DIANOSTIC_MIN_CNT) && (g_encoder.start_dianostic_cnt >= 1000)) {
			float last_delta = (float)g_encoder.last_delta_cnt;
			float r = (float)delta_cnt / (last_delta + 0.0000001f);
			r = ABS(r);
			float r_thr;
			if (g_encoder.last_delta_cnt <= CONFIG_ENC_DIANOSTIC_MIN_CNT * 2) {
				r_thr = 0.3f;
			}else if (g_encoder.last_delta_cnt <= CONFIG_ENC_DIANOSTIC_MIN_CNT * 4) {
				r_thr = 0.5f;
			}else if (g_encoder.last_delta_cnt <= CONFIG_ENC_DIANOSTIC_MIN_CNT * 6) {
				r_thr = 0.6f;
			}else {
				r_thr = 0.7f;
			}
			if (r <= r_thr || r >= (2.0f - r_thr)) {
				g_encoder.enc_maybe_err = true;
			}
		}
		g_encoder.last_delta_cnt = delta_cnt;
	}
#else
	g_encoder.enc_maybe_err = false;
#endif
}

float encoder_get_theta(void) {
	if (!g_encoder.b_index_found) {
		return g_encoder.pwm_angle;
	}
	u32 cnt = _abi_count();
	__NOP();__NOP();__NOP();__NOP();
	if (ENC_OverFlow()) {
		cnt = _abi_count();
		g_encoder.b_timer_ov = true;
		ENC_ClearUpFlags();
	}

	encoder_detect_error(cnt);
	
    bool snap_to_zero_vel = encoder_run_pll((float)(cnt));

	if (snap_to_zero_vel) {
		g_encoder.interpolation = 0.1f;
	}else {
		if (cnt == g_encoder.last_cnt) {
			g_encoder.interpolation += g_encoder.est_vel_counts * FOC_CTRL_US;
			if (g_encoder.interpolation > ENC_MAX_interpolation) {
				g_encoder.interpolation = ENC_MAX_interpolation;
			}else if (g_encoder.interpolation < -ENC_MAX_interpolation) {
				g_encoder.interpolation = -ENC_MAX_interpolation;
			}
		}else {
			g_encoder.interpolation = 0.0f;
		}
	}

	g_encoder.abi_angle = ENC_Pluse_Nr_2_angle((float)cnt + g_encoder.interpolation) * g_encoder.motor_poles + g_encoder.enc_offset;
	g_encoder.abi_angle += _eccentricity_compensation(cnt);
	rand_angle(g_encoder.abi_angle);
	g_encoder.last_cnt = cnt;
	g_encoder.last_us = task_get_usecond();

	g_encoder.position += (g_encoder.est_vel_counts/g_encoder.cpr) * FOC_CTRL_US;
	return g_encoder.abi_angle;
}


void encoder_produce_error(bool error) {
	g_encoder.produce_error = error;
}

bool encoder_may_error(void) {
	return g_encoder.enc_maybe_err;
}

float encoder_get_speed(void) {
	return (g_encoder.est_vel_counts/g_encoder.cpr) * 60.0f;
}

float encoder_get_vel_count(void) {
	return g_encoder.est_vel_counts;
}

float encoder_get_position(void) {
	return g_encoder.position;
}

float encoder_zero_phase_detect(float *enc_off) {	
	delay_ms(5);	
	float total_enc_off = g_encoder.pwm_count;
	float prev_offset = g_encoder.enc_offset;
	float phase = encoder_get_pwm_angle();
	float total_ph = phase;
	int count = 0;
	for(; count < 10; count++) {
		delay_ms(5); //wait time for pwm
		float angle_now = encoder_get_pwm_angle();
		if (ABS(phase - angle_now) > 2.0f) {
			g_encoder.enc_offset = prev_offset;
			g_encoder.enc_count_off = 0xFFFFFFFF;
			g_encoder.b_cali_err = true;
			sys_debug("err %f, %f, %d\n", phase, angle_now, count);
			return INVALID_ANGLE;
		}

		phase = angle_now;
		total_ph += phase;
		total_enc_off += g_encoder.pwm_count;
	}
	sys_debug("count = %d, %f, %d\n", count, total_enc_off, g_encoder.pwm_count);
	float offset_now = total_ph/(float)(count + 1);
	g_encoder.enc_offset = offset_now;
	g_encoder.enc_count_off = (u32)(total_enc_off/(float)(count + 1));
	if (enc_off) {
		*enc_off = (float)g_encoder.enc_count_off;
		sys_debug("encoder off %f\n", *enc_off);
	}
	sys_debug("encoder ph off = %f\n", offset_now);
	return offset_now;
}

void encoder_clear_cnt_offset(void) {
	g_encoder.b_cali_err = false;
	g_encoder.enc_count_off = 0xFFFFFFFF;
}

u32 encoder_get_cnt_offset(void) {
	return g_encoder.enc_count_off;
}

bool encoder_get_cali_error(void) {
	return g_encoder.b_cali_err;
}

static void encoder_sync_pwm_abs(void) {
	u32 mask = cpu_enter_critical();
	ENC_COUNT = g_encoder.pwm_count;
	g_encoder.last_cnt = g_encoder.pwm_count;
	g_encoder.est_pll.observer = (float)g_encoder.pwm_count;
	g_encoder.abi_angle = g_encoder.pwm_angle;
	g_encoder.b_index_found = true;
	g_encoder.last_delta_cnt = MAX_S16;
	PLL_Reset(&g_encoder.est_pll, (float)_abi_count());
	cpu_exit_critical(mask);
}

/*I 信号的中断处理，一圈一个中断*/
static int abi_I_delta = 0;
void ENC_ABI_IRQHandler(void) {
	g_encoder.b_index_cnt = ENC_COUNT;	
	if (!g_encoder.b_index_found){
		encoder_sync_pwm_abs();
	}
	if (g_encoder.b_index_cnt > 10 && g_encoder.b_index_cnt < (g_encoder.cpr - 10)) {
		abi_I_delta = g_encoder.b_index_cnt;
	} 
}

/* 编码器AB信号读书溢出处理 */
void ENC_TIMER_Overflow(void) {
	//g_encoder.b_timer_ov = true;
}


/*PWM 信号捕获一个周期的处理 */
static int pwm_count = 0;
static int pwm_check_count = 0;
void ENC_PWM_Duty_Handler(float t, float d) {
	float duty = ENC_Duty(d, t);
	if (duty < ENC_PWM_Min_P || duty > ENC_PWM_Max_P) {
		return;
	}
	float Nr = ENC_Duty_2_Pluse_Nr(duty);
	if (Nr < 0) {
		Nr = 0;
	}else if (Nr > ENC_MAX_RES) {
		Nr = ENC_MAX_RES;
	}
	u32 n_nr = (u32)Nr;
	if (Nr - n_nr >= 0.5f) {
		g_encoder.pwm_count = n_nr + 1;
	}else {
		g_encoder.pwm_count = n_nr;
	}
	g_encoder.pwm_angle = ENC_Pluse_Nr_2_angle(Nr) * g_encoder.motor_poles + g_encoder.enc_offset;	
	rand_angle(g_encoder.pwm_angle);
	if (!g_encoder.b_index_found && pwm_count++ >= 10) {
		encoder_sync_pwm_abs();
	}
	pwm_check_count ++;
#ifdef CONFIG_ENC_ERR_TEST
	if (!g_encoder.produce_error) {
		g_encoder.pwm_time_ms = get_tick_ms();
	}
#endif
}
static u32 _check_time = 0;
bool ENC_Check_error(void) {
	bool error = false;
	if (get_delta_ms(_check_time) > 200) {
		if (pwm_check_count == 0) {
			error = true;
		}
		pwm_check_count = 0;
		_check_time = get_tick_ms();
	}
	return error;
}

float encoder_get_pwm_angle(void) {
#ifdef ENCODER_CC_INVERT
	g_encoder.pwm_angle = 360.0f - (g_encoder.pwm_angle - g_encoder.enc_offset) + g_encoder.enc_offset;
	rand_angle(g_encoder.pwm_angle);
#endif
	return g_encoder.pwm_angle;
}

float encoder_get_abi_angle(void) {
	u32 cnt = _abi_count();
	float angle = ENC_Pluse_Nr_2_angle((float)cnt) * g_encoder.motor_poles + g_encoder.enc_offset;
	rand_angle(angle);
	return angle;
}

void encoder_log(void) {
	sys_debug("pwm %f, abi %f\n", encoder_get_pwm_angle(), encoder_get_abi_angle());
	sys_debug("pwm count %d, I count %d\n", g_encoder.pwm_count, abi_I_delta);
	sys_debug("pwm freq %f, err %d\n", enc_get_pwm_freq(), g_encoder.enc_maybe_err);
}