/*******************************************************************************
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* 文件名称 : motion_control.c
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* 文件说明 : 割草机纯追踪运动控制器（C 语言实现）
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* 创建日期 : 2025-11-22
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*******************************************************************************/
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#include "motion_control.h"
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#include <math.h>
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#include <string.h>
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#include "arm_math.h"
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#include "motion_config.h"
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#ifndef M_PI
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#define M_PI (3.14159265358979323846f)
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#endif
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#define DEG2RAD (0.017453292519943295769236907684886f)
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#define RAD2DEG (57.295779513082320876798154814105f)
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#define MC_CLAMP(v, lo, hi) ((v) < (lo) ? (lo) : (((v) > (hi)) ? (hi) : (v)))
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/* 将角度约束到 [-pi, pi]，避免航向跳变 */
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static float mc_wrap_angle(float angle)
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{
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while (angle > (float)M_PI)
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{
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angle -= 2.0f * (float)M_PI;
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}
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while (angle < -(float)M_PI)
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{
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angle += 2.0f * (float)M_PI;
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}
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return angle;
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}
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/* 读取路径点，索引越界时截到末尾 */
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static void mc_get_point(const MC_State *state, HIDO_UINT32 idx, float outPt[2])
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{
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if (idx >= state->path_count)
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{
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idx = state->path_count - 1U;
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}
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outPt[0] = state->path_xy[idx * 2U];
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outPt[1] = state->path_xy[idx * 2U + 1U];
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}
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/* 计算两个二维点的平方距离 */
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static float mc_distance_sq(const float a[2], const float b[2])
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{
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float dx = a[0] - b[0];
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float dy = a[1] - b[1];
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return dx * dx + dy * dy;
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}
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/* 计算两点距离（含 sqrt 防护） */
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static float mc_distance(const float a[2], const float b[2])
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{
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float dist_sq = mc_distance_sq(a, b);
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float dist = 0.0f;
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if (dist_sq > 0.0f)
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{
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arm_sqrt_f32(dist_sq, &dist);
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}
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return dist;
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}
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/* 搜索当前位置最近的路径点 */
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static HIDO_UINT32 mc_find_nearest(const MC_State *state)
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{
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float best_dist = 1.0e9f;
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HIDO_UINT32 best_idx = state->nearest_index;
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float pos[2] = {state->pos[0], state->pos[1]};
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for (HIDO_UINT32 i = 0; i < state->path_count; i++)
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{
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float point[2];
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mc_get_point(state, i, point);
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float dist_sq = mc_distance_sq(point, pos);
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if (dist_sq < best_dist)
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{
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best_dist = dist_sq;
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best_idx = i;
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}
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}
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return best_idx;
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}
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/* 沿路径累积距离，直到达到前视目标 */
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static HIDO_UINT32 mc_find_lookahead(const MC_State *state, HIDO_UINT32 start_idx, float lookahead_m)
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{
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float accum = 0.0f;
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float current[2];
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mc_get_point(state, start_idx, current);
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for (HIDO_UINT32 i = start_idx; i < state->path_count - 1U; i++)
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{
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float next[2];
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mc_get_point(state, i + 1U, next);
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float seg = mc_distance(current, next);
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accum += seg;
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if (accum >= lookahead_m)
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{
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return i + 1U;
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}
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current[0] = next[0];
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current[1] = next[1];
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}
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return state->path_count - 1U;
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}
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/* 计算带符号横向误差（左正右负） */
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static float mc_cross_track_error(const MC_State *state, HIDO_UINT32 nearest_idx)
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{
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if (state->path_count < 2U)
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{
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return 0.0f;
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}
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HIDO_UINT32 idx0 = (nearest_idx == 0U) ? 0U : nearest_idx - 1U;
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HIDO_UINT32 idx1 = (nearest_idx + 1U < state->path_count) ? nearest_idx + 1U : nearest_idx;
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float p0[2];
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float p1[2];
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float pos[2] = {state->pos[0], state->pos[1]};
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mc_get_point(state, idx0, p0);
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mc_get_point(state, idx1, p1);
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float vx = p1[0] - p0[0];
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float vy = p1[1] - p0[1];
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float wx = pos[0] - p0[0];
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float wy = pos[1] - p0[1];
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float seg_len_sq = vx * vx + vy * vy;
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float t = 0.0f;
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if (seg_len_sq > 0.0f)
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{
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t = (wx * vx + wy * vy) / seg_len_sq;
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}
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if (t < 0.0f)
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{
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t = 0.0f;
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}
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else if (t > 1.0f)
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{
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t = 1.0f;
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}
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float proj_x = p0[0] + vx * t;
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float proj_y = p0[1] + vy * t;
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float dx = pos[0] - proj_x;
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float dy = pos[1] - proj_y;
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float dist_sq = dx * dx + dy * dy;
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float dist = 0.0f;
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if (dist_sq > 0.0f)
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{
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arm_sqrt_f32(dist_sq, &dist);
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}
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float cross = vx * (pos[1] - p0[1]) - vy * (pos[0] - p0[0]);
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return (cross >= 0.0f) ? dist : -dist;
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}
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/* 阶段：旋转/接近起点，使车准备好跟踪路径 */
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static void mc_compute_goto_start(MC_State *state, float dt_s, MC_Output *out)
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{
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float start_point[2];
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mc_get_point(state, 0U, start_point);
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state->current_target_xy[0] = start_point[0];
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state->current_target_xy[1] = start_point[1];
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out->target_valid = HIDO_TRUE;
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out->target_xy[0] = start_point[0];
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out->target_xy[1] = start_point[1];
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float vec_x = start_point[0] - state->pos[0];
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float vec_y = start_point[1] - state->pos[1];
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float dist = mc_distance(start_point, state->pos);
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float desired_heading = arm_atan2_f32(vec_y, vec_x);
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out->target_heading_deg = desired_heading * RAD2DEG;
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float heading_err = mc_wrap_angle(desired_heading - state->heading_rad);
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float yaw_rate_cmd = state->config.heading_kp * heading_err;
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yaw_rate_cmd = MC_CLAMP(yaw_rate_cmd, -state->config.max_turn_rate, state->config.max_turn_rate);
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float forward = 0.0f;
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if (dist > state->config.start_pos_tolerance_m)
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{
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if (fabsf(heading_err) < state->config.start_heading_tolerance_rad)
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{
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float desired = state->config.base_speed_mps + 0.5f * dist;
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forward = MC_CLAMP(desired,
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state->config.min_follow_speed_mps,
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state->config.max_forward_mps);
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}
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}
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else if (fabsf(heading_err) < state->config.start_heading_tolerance_rad)
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{
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state->stage = MC_STAGE_FOLLOW_PATH;
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}
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out->forward_mps = forward;
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out->turn_rate = yaw_rate_cmd;
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out->heading_error = heading_err;
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out->cross_track_error = dist;
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out->active = (forward != 0.0f) || (fabsf(yaw_rate_cmd) > 0.01f);
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(void)dt_s;
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}
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/* 阶段：纯追踪 + 航向/横向误差补偿 */
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static void mc_compute_follow_path(MC_State *state, float dt_s, MC_Output *out)
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{
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HIDO_UINT32 nearest_idx = mc_find_nearest(state);
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state->nearest_index = nearest_idx;
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float lookahead = state->config.lookahead_min_m;
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float speed_ratio = MC_CLAMP(state->speed_mps / state->config.max_forward_mps, 0.0f, 1.0f);
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lookahead += (state->config.lookahead_max_m - state->config.lookahead_min_m) * speed_ratio;
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HIDO_UINT32 lookahead_idx = mc_find_lookahead(state, nearest_idx, lookahead);
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state->lookahead_index = lookahead_idx;
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float target[2];
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mc_get_point(state, lookahead_idx, target);
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state->current_target_xy[0] = target[0];
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state->current_target_xy[1] = target[1];
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out->target_valid = HIDO_TRUE;
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out->target_xy[0] = target[0];
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out->target_xy[1] = target[1];
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float vec_x = target[0] - state->pos[0];
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float vec_y = target[1] - state->pos[1];
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float desired_heading = arm_atan2_f32(vec_y, vec_x);
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out->target_heading_deg = desired_heading * RAD2DEG;
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float heading_err = mc_wrap_angle(desired_heading - state->heading_rad);
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float heading_err_rate = (heading_err - state->last_heading_err) / (dt_s > 0.0f ? dt_s : 0.013f);
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state->last_heading_err = heading_err;
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float cross_track = mc_cross_track_error(state, nearest_idx);
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float yaw_rate_cmd = state->config.heading_kp * heading_err
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+ state->config.heading_kd * heading_err_rate
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+ state->config.xtrack_kp * cross_track;
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yaw_rate_cmd = MC_CLAMP(yaw_rate_cmd, -state->config.max_turn_rate, state->config.max_turn_rate);
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float forward = state->config.base_speed_mps
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- state->config.heading_speed_scale * fabsf(heading_err)
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- state->config.xtrack_speed_scale * fabsf(cross_track);
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forward = MC_CLAMP(forward,
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state->config.min_follow_speed_mps,
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state->config.max_forward_mps);
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float goal[2];
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mc_get_point(state, state->path_count - 1U, goal);
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float goal_dist = mc_distance(goal, state->pos);
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if (goal_dist < state->config.goal_tolerance_m)
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{
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state->stage = MC_STAGE_FINISHED;
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forward = 0.0f;
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yaw_rate_cmd = 0.0f;
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}
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out->forward_mps = forward;
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out->turn_rate = yaw_rate_cmd;
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out->heading_error = heading_err;
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out->cross_track_error = cross_track;
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out->active = (state->stage != MC_STAGE_FINISHED);
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}
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/* 填充默认配置 */
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HIDO_VOID MC_DefaultConfig(MC_Config *_cfg)
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{
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if (_cfg == HIDO_NULL)
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{
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return;
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}
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_cfg->max_forward_mps = MC_CFG_MAX_FORWARD_MPS;
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_cfg->max_reverse_mps = MC_CFG_MAX_REVERSE_MPS;
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_cfg->max_turn_rate = MC_CFG_MAX_TURN_RATE_RAD;
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_cfg->base_speed_mps = MC_CFG_BASE_SPEED_MPS;
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_cfg->min_follow_speed_mps = MC_CFG_MIN_FOLLOW_SPEED_MPS;
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_cfg->lookahead_min_m = MC_CFG_LOOKAHEAD_MIN_M;
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_cfg->lookahead_max_m = MC_CFG_LOOKAHEAD_MAX_M;
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_cfg->start_pos_tolerance_m = MC_CFG_START_POS_TOL_M;
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_cfg->start_heading_tolerance_rad = MC_CFG_START_HEADING_TOL_RAD;
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_cfg->goal_tolerance_m = MC_CFG_GOAL_TOL_M;
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_cfg->heading_kp = MC_CFG_HEADING_KP;
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_cfg->heading_kd = MC_CFG_HEADING_KD;
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_cfg->xtrack_kp = MC_CFG_XTRACK_KP;
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_cfg->heading_speed_scale = MC_CFG_HEADING_SPEED_SCALE;
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_cfg->xtrack_speed_scale = MC_CFG_XTRACK_SPEED_SCALE;
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}
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/* 初始化控制器，绑定路径与配置 */
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HIDO_VOID MC_Init(MC_State *_state, const MC_Config *_cfg, const float *_path_xy, HIDO_UINT32 _point_count)
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{
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if (_state == HIDO_NULL || _cfg == HIDO_NULL || _path_xy == HIDO_NULL || _point_count < 2U)
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{
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return;
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}
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memset(_state, 0, sizeof(MC_State));
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_state->config = *_cfg;
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_state->path_xy = _path_xy;
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_state->path_count = _point_count;
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_state->stage = MC_STAGE_GOTO_START;
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_state->nearest_index = 0U;
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_state->lookahead_index = 0U;
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}
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/* 注入最新 ENU 位姿及航向/速度 */
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HIDO_VOID MC_UpdateGps(MC_State *_state, const float _enu[3], const ST_GPRMI *_gprmi)
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{
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if (_state == HIDO_NULL || _enu == HIDO_NULL || _gprmi == HIDO_NULL)
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{
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return;
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}
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_state->pos[0] = _enu[0];
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_state->pos[1] = _enu[1];
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_state->pos[2] = _enu[2];
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float gps_heading_rad = mc_wrap_angle((_gprmi->m_fHeadingAngle) * DEG2RAD);
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if (_state->imu_valid == HIDO_TRUE)
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{
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float heading_err = mc_wrap_angle(gps_heading_rad - _state->heading_rad);
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_state->heading_rad = mc_wrap_angle(_state->heading_rad + heading_err * MC_CFG_GPS_HEADING_BLEND);
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}
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else
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{
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_state->heading_rad = gps_heading_rad;
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}
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_state->heading_deg = _state->heading_rad * RAD2DEG;
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_state->pitch_deg = _gprmi->m_fPitchAngle;
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_state->roll_deg = _gprmi->m_fRollAngle;
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_state->vel[0] = _gprmi->m_fEastVelocity;
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_state->vel[1] = _gprmi->m_fNorthVelocity;
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float speed_sq = _state->vel[0] * _state->vel[0] + _state->vel[1] * _state->vel[1];
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float speed = 0.0f;
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if (speed_sq > 0.0f)
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{
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arm_sqrt_f32(speed_sq, &speed);
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}
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_state->speed_mps = speed;
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_state->pose_valid = HIDO_TRUE;
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}
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/* 更新 IMU 陀螺 Z 轴（yaw 角速度） */
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HIDO_VOID MC_UpdateImu(MC_State *_state, const ST_GPIMU *_gpimu)
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{
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if (_state == HIDO_NULL || _gpimu == HIDO_NULL)
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{
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return;
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}
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_state->yaw_rate_rad = _gpimu->m_fGyroZ * DEG2RAD;
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_state->imu_valid = HIDO_TRUE;
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}
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/* 入口：根据阶段计算控制量 */
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HIDO_VOID MC_Compute(MC_State *_state, float _dt_s, MC_Output *_out)
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{
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if (_state == HIDO_NULL || _out == HIDO_NULL)
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{
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return;
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}
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memset(_out, 0, sizeof(MC_Output));
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_out->target_valid = HIDO_FALSE;
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_out->target_xy[0] = 0.0f;
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_out->target_xy[1] = 0.0f;
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if (_state->path_xy == HIDO_NULL || _state->path_count < 2U)
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{
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return;
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}
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if (_state->pose_valid == HIDO_FALSE)
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{
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return;
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}
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if (_state->imu_valid == HIDO_TRUE && _dt_s > 0.0f)
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{
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_state->heading_rad = mc_wrap_angle(_state->heading_rad + _state->yaw_rate_rad * _dt_s);
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_state->heading_deg = _state->heading_rad * RAD2DEG;
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}
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if (_state->stage == MC_STAGE_IDLE)
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{
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_state->stage = MC_STAGE_GOTO_START;
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}
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_out->target_heading_deg = _state->heading_deg;
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switch (_state->stage)
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{
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case MC_STAGE_GOTO_START:
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mc_compute_goto_start(_state, _dt_s, _out);
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break;
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case MC_STAGE_FOLLOW_PATH:
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mc_compute_follow_path(_state, _dt_s, _out);
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break;
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case MC_STAGE_FINISHED:
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_out->active = HIDO_FALSE;
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_out->target_heading_deg = _state->heading_deg;
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break;
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default:
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break;
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}
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_out->stage = _state->stage;
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_out->pos_enu[0] = _state->pos[0];
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_out->pos_enu[1] = _state->pos[1];
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_out->pos_enu[2] = _state->pos[2];
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_out->heading_deg = _state->heading_deg;
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_out->pitch_deg = _state->pitch_deg;
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_out->roll_deg = _state->roll_deg;
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if (_state->stage == MC_STAGE_FOLLOW_PATH || _state->stage == MC_STAGE_GOTO_START)
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{
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_out->target_valid = HIDO_TRUE;
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_out->target_xy[0] = _state->current_target_xy[0];
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_out->target_xy[1] = _state->current_target_xy[1];
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}
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else
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{
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_out->target_valid = HIDO_FALSE;
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_out->target_xy[0] = 0.0f;
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_out->target_xy[1] = 0.0f;
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}
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}
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