commit 816da4829968ff2992fabf8872566c150a5dc54e
Author: xingchen <xingchen@163.com>
Date:   Tue Sep 1 09:25:26 2026 +0800

    feat(example): 新增飞行控制 C 示例项目
    
    - 提供传感器、滤波、控制律和执行器等模块化示例
    - 包含约 35 个函数用于代码分析与文档生成流程测试
    - 使用 Makefile 支持最小化编译验证

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e421fc4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+CC ?= gcc
+CFLAGS ?= -Iinclude -Wall -Wextra -std=c99
+
+SRC := $(wildcard src/*.c)
+OBJ := $(SRC:.c=.o)
+
+all: do178_small_app
+
+do178_small_app: $(OBJ)
+	$(CC) $(OBJ) -o $@
+
+clean:
+	rm -f $(OBJ) do178_small_app
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5b1835c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,24 @@
+# DO178 Small C Project
+
+这是一个用于 StarCodeDoc 文档模板端到端验证的小型 C 示例项目。
+
+项目刻意拆成多个职责清晰的小模块，用来验证：
+
+- 章节 4 动态模块标题生成
+- 每个模块下的模块主要函数表
+- 每个函数下的七行函数设计表
+- main 函数归属模块
+- 流程图图片块与函数 sourceRefs 绑定
+
+模块划分：
+
+- 系统入口与调度
+- 传感器采集
+- 信号滤波
+- 控制律计算
+- 执行器输出
+- 通信指令
+- 诊断监控
+- 运行日志
+
+函数数量约 35 个，适合快速构建知识库并验证文档生成效果。
diff --git a/include/flight_app.h b/include/flight_app.h
new file mode 100644
index 0000000..dc3e11f
--- /dev/null
+++ b/include/flight_app.h
@@ -0,0 +1,94 @@
+#ifndef FLIGHT_APP_H
+#define FLIGHT_APP_H
+
+#include <stdint.h>
+
+typedef struct {
+    int16_t raw_air_speed;
+    int16_t raw_altitude;
+    int16_t raw_pitch;
+    int16_t raw_temperature;
+} SensorRawData;
+
+typedef struct {
+    float air_speed;
+    float altitude;
+    float pitch;
+    float temperature;
+} SensorData;
+
+typedef struct {
+    float target_speed;
+    float target_altitude;
+    float pitch_limit;
+    uint8_t auto_mode;
+} CommandState;
+
+typedef struct {
+    float throttle;
+    float elevator;
+    uint8_t armed;
+} ActuatorState;
+
+typedef struct {
+    uint16_t sensor_fault;
+    uint16_t actuator_fault;
+    uint16_t command_fault;
+    uint16_t cycle_count;
+} DiagnosticState;
+
+typedef struct {
+    SensorData sensor;
+    CommandState command;
+    ActuatorState actuator;
+    DiagnosticState diagnostic;
+} AppState;
+
+void System_Init(AppState *state);
+void System_LoadDefaults(CommandState *command);
+void System_RunCycle(AppState *state);
+void System_Shutdown(AppState *state);
+
+void Sensor_Init(SensorRawData *raw);
+void Sensor_ReadAdc(SensorRawData *raw);
+uint8_t Sensor_Validate(const SensorRawData *raw);
+void Sensor_Scale(const SensorRawData *raw, SensorData *data);
+void Sensor_Collect(SensorRawData *raw, SensorData *data);
+
+void Filter_Init(SensorData *data);
+float Filter_Median3(float a, float b, float c);
+float Filter_LowPass(float previous, float current, float alpha);
+float Filter_Limit(float value, float min_value, float max_value);
+void Filter_Process(SensorData *data);
+
+void Control_Init(CommandState *command);
+float Control_ComputeSpeedError(const CommandState *command, const SensorData *data);
+float Control_ComputeAltitudeError(const CommandState *command, const SensorData *data);
+float Control_PidStep(float error, float gain, float limit);
+void Control_Update(const CommandState *command, const SensorData *data, ActuatorState *actuator);
+
+void Actuator_Init(ActuatorState *actuator);
+void Actuator_Arm(ActuatorState *actuator);
+void Actuator_WriteThrottle(ActuatorState *actuator, float throttle);
+void Actuator_WriteElevator(ActuatorState *actuator, float elevator);
+void Actuator_UpdateOutputs(ActuatorState *actuator);
+void Actuator_Disarm(ActuatorState *actuator);
+
+void Comm_Init(CommandState *command);
+uint16_t Comm_PackStatus(const AppState *state);
+uint8_t Comm_ReceiveCommand(CommandState *command, uint16_t word);
+void Comm_ApplyCommand(CommandState *command, uint16_t word);
+void Comm_SendStatus(uint16_t status_word);
+
+void Diag_Init(DiagnosticState *diagnostic);
+uint8_t Diag_CheckSensor(const SensorData *data);
+uint8_t Diag_CheckActuator(const ActuatorState *actuator);
+void Diag_UpdateFaults(DiagnosticState *diagnostic, const SensorData *data, const ActuatorState *actuator);
+uint16_t Diag_ReportStatus(const DiagnosticState *diagnostic);
+
+void Log_Init(void);
+void Log_RecordSample(const SensorData *data);
+void Log_RecordFault(uint16_t status_word);
+void Log_Flush(void);
+
+#endif
diff --git a/src/actuators.c b/src/actuators.c
new file mode 100644
index 0000000..85bbcc9
--- /dev/null
+++ b/src/actuators.c
@@ -0,0 +1,35 @@
+#include "flight_app.h"
+
+void Actuator_Init(ActuatorState *actuator) {
+    actuator->throttle = 0.0f;
+    actuator->elevator = 0.0f;
+    actuator->armed = 0U;
+}
+
+void Actuator_Arm(ActuatorState *actuator) {
+    actuator->armed = 1U;
+}
+
+void Actuator_WriteThrottle(ActuatorState *actuator, float throttle) {
+    if (actuator->armed) {
+        actuator->throttle = Filter_Limit(throttle, 0.0f, 1.0f);
+    }
+}
+
+void Actuator_WriteElevator(ActuatorState *actuator, float elevator) {
+    if (actuator->armed) {
+        actuator->elevator = Filter_Limit(elevator, -20.0f, 20.0f);
+    }
+}
+
+void Actuator_UpdateOutputs(ActuatorState *actuator) {
+    Actuator_Arm(actuator);
+    Actuator_WriteThrottle(actuator, actuator->throttle);
+    Actuator_WriteElevator(actuator, actuator->elevator);
+}
+
+void Actuator_Disarm(ActuatorState *actuator) {
+    actuator->armed = 0U;
+    actuator->throttle = 0.0f;
+    actuator->elevator = 0.0f;
+}
diff --git a/src/comm.c b/src/comm.c
new file mode 100644
index 0000000..d30abad
--- /dev/null
+++ b/src/comm.c
@@ -0,0 +1,31 @@
+#include "flight_app.h"
+
+void Comm_Init(CommandState *command) {
+    command->auto_mode = 1U;
+}
+
+uint16_t Comm_PackStatus(const AppState *state) {
+    uint16_t word = 0U;
+    word |= (uint16_t)(state->diagnostic.sensor_fault & 0x01U);
+    word |= (uint16_t)((state->diagnostic.actuator_fault & 0x01U) << 1U);
+    word |= (uint16_t)((state->diagnostic.command_fault & 0x01U) << 2U);
+    return word;
+}
+
+uint8_t Comm_ReceiveCommand(CommandState *command, uint16_t word) {
+    if ((word & 0x8000U) == 0U) {
+        return 0U;
+    }
+    Comm_ApplyCommand(command, word);
+    return 1U;
+}
+
+void Comm_ApplyCommand(CommandState *command, uint16_t word) {
+    command->auto_mode = (uint8_t)((word >> 14U) & 0x01U);
+    command->target_speed = 180.0f + (float)(word & 0x003FU);
+    command->target_altitude = 2000.0f + (float)((word >> 6U) & 0x00FFU) * 10.0f;
+}
+
+void Comm_SendStatus(uint16_t status_word) {
+    (void)status_word;
+}
diff --git a/src/control.c b/src/control.c
new file mode 100644
index 0000000..3d9a11b
--- /dev/null
+++ b/src/control.c
@@ -0,0 +1,34 @@
+#include "flight_app.h"
+
+void Control_Init(CommandState *command) {
+    command->target_speed = 200.0f;
+    command->target_altitude = 2500.0f;
+    command->pitch_limit = 10.0f;
+    command->auto_mode = 0U;
+}
+
+float Control_ComputeSpeedError(const CommandState *command, const SensorData *data) {
+    return command->target_speed - data->air_speed;
+}
+
+float Control_ComputeAltitudeError(const CommandState *command, const SensorData *data) {
+    return command->target_altitude - data->altitude;
+}
+
+float Control_PidStep(float error, float gain, float limit) {
+    float output = error * gain;
+    if (output > limit) {
+        return limit;
+    }
+    if (output < -limit) {
+        return -limit;
+    }
+    return output;
+}
+
+void Control_Update(const CommandState *command, const SensorData *data, ActuatorState *actuator) {
+    float speed_error = Control_ComputeSpeedError(command, data);
+    float altitude_error = Control_ComputeAltitudeError(command, data);
+    actuator->throttle = Control_PidStep(speed_error, 0.01f, 1.0f);
+    actuator->elevator = Control_PidStep(altitude_error, 0.002f, command->pitch_limit);
+}
diff --git a/src/diagnostics.c b/src/diagnostics.c
new file mode 100644
index 0000000..d45e5af
--- /dev/null
+++ b/src/diagnostics.c
@@ -0,0 +1,43 @@
+#include "flight_app.h"
+
+void Diag_Init(DiagnosticState *diagnostic) {
+    diagnostic->sensor_fault = 0U;
+    diagnostic->actuator_fault = 0U;
+    diagnostic->command_fault = 0U;
+    diagnostic->cycle_count = 0U;
+}
+
+uint8_t Diag_CheckSensor(const SensorData *data) {
+    if (data->air_speed < 0.0f || data->altitude < 0.0f) {
+        return 0U;
+    }
+    if (data->temperature < -40.0f || data->temperature > 85.0f) {
+        return 0U;
+    }
+    return 1U;
+}
+
+uint8_t Diag_CheckActuator(const ActuatorState *actuator) {
+    if (actuator->throttle < 0.0f || actuator->throttle > 1.0f) {
+        return 0U;
+    }
+    if (actuator->elevator < -20.0f || actuator->elevator > 20.0f) {
+        return 0U;
+    }
+    return 1U;
+}
+
+void Diag_UpdateFaults(DiagnosticState *diagnostic, const SensorData *data, const ActuatorState *actuator) {
+    diagnostic->sensor_fault = Diag_CheckSensor(data) ? 0U : 1U;
+    diagnostic->actuator_fault = Diag_CheckActuator(actuator) ? 0U : 1U;
+    diagnostic->command_fault = 0U;
+    diagnostic->cycle_count++;
+}
+
+uint16_t Diag_ReportStatus(const DiagnosticState *diagnostic) {
+    uint16_t status = 0U;
+    status |= diagnostic->sensor_fault;
+    status |= (uint16_t)(diagnostic->actuator_fault << 1U);
+    status |= (uint16_t)(diagnostic->command_fault << 2U);
+    return status;
+}
diff --git a/src/filters.c b/src/filters.c
new file mode 100644
index 0000000..d74716d
--- /dev/null
+++ b/src/filters.c
@@ -0,0 +1,39 @@
+#include "flight_app.h"
+
+void Filter_Init(SensorData *data) {
+    data->air_speed = 0.0f;
+    data->altitude = 0.0f;
+    data->pitch = 0.0f;
+    data->temperature = 25.0f;
+}
+
+float Filter_Median3(float a, float b, float c) {
+    if ((a >= b && a <= c) || (a >= c && a <= b)) {
+        return a;
+    }
+    if ((b >= a && b <= c) || (b >= c && b <= a)) {
+        return b;
+    }
+    return c;
+}
+
+float Filter_LowPass(float previous, float current, float alpha) {
+    return previous + alpha * (current - previous);
+}
+
+float Filter_Limit(float value, float min_value, float max_value) {
+    if (value < min_value) {
+        return min_value;
+    }
+    if (value > max_value) {
+        return max_value;
+    }
+    return value;
+}
+
+void Filter_Process(SensorData *data) {
+    data->air_speed = Filter_Limit(Filter_LowPass(data->air_speed, data->air_speed, 0.2f), 0.0f, 450.0f);
+    data->altitude = Filter_Limit(data->altitude, 0.0f, 12000.0f);
+    data->pitch = Filter_Limit(Filter_Median3(data->pitch, data->pitch, data->pitch), -30.0f, 30.0f);
+    data->temperature = Filter_Limit(data->temperature, -40.0f, 85.0f);
+}
diff --git a/src/logger.c b/src/logger.c
new file mode 100644
index 0000000..65fe58e
--- /dev/null
+++ b/src/logger.c
@@ -0,0 +1,25 @@
+#include "flight_app.h"
+
+static uint16_t g_log_count = 0U;
+static uint16_t g_fault_count = 0U;
+
+void Log_Init(void) {
+    g_log_count = 0U;
+    g_fault_count = 0U;
+}
+
+void Log_RecordSample(const SensorData *data) {
+    (void)data;
+    g_log_count++;
+}
+
+void Log_RecordFault(uint16_t status_word) {
+    if (status_word != 0U) {
+        g_fault_count++;
+    }
+}
+
+void Log_Flush(void) {
+    g_log_count = 0U;
+    g_fault_count = 0U;
+}
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..824f002
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,13 @@
+#include "flight_app.h"
+
+int main(void) {
+    AppState state;
+    System_Init(&state);
+
+    for (uint16_t i = 0; i < 5; ++i) {
+        System_RunCycle(&state);
+    }
+
+    System_Shutdown(&state);
+    return 0;
+}
diff --git a/src/sensors.c b/src/sensors.c
new file mode 100644
index 0000000..142ea3e
--- /dev/null
+++ b/src/sensors.c
@@ -0,0 +1,42 @@
+#include "flight_app.h"
+
+void Sensor_Init(SensorRawData *raw) {
+    raw->raw_air_speed = 0;
+    raw->raw_altitude = 0;
+    raw->raw_pitch = 0;
+    raw->raw_temperature = 250;
+}
+
+void Sensor_ReadAdc(SensorRawData *raw) {
+    raw->raw_air_speed = 2048;
+    raw->raw_altitude = 1800;
+    raw->raw_pitch = 30;
+    raw->raw_temperature = 265;
+}
+
+uint8_t Sensor_Validate(const SensorRawData *raw) {
+    if (raw->raw_air_speed < 0 || raw->raw_air_speed > 4095) {
+        return 0U;
+    }
+    if (raw->raw_altitude < 0 || raw->raw_altitude > 4095) {
+        return 0U;
+    }
+    if (raw->raw_temperature < -400 || raw->raw_temperature > 850) {
+        return 0U;
+    }
+    return 1U;
+}
+
+void Sensor_Scale(const SensorRawData *raw, SensorData *data) {
+    data->air_speed = (float)raw->raw_air_speed * 0.12f;
+    data->altitude = (float)raw->raw_altitude * 2.5f;
+    data->pitch = (float)raw->raw_pitch * 0.1f;
+    data->temperature = (float)raw->raw_temperature * 0.1f;
+}
+
+void Sensor_Collect(SensorRawData *raw, SensorData *data) {
+    Sensor_ReadAdc(raw);
+    if (Sensor_Validate(raw)) {
+        Sensor_Scale(raw, data);
+    }
+}
diff --git a/src/system.c b/src/system.c
new file mode 100644
index 0000000..e450c76
--- /dev/null
+++ b/src/system.c
@@ -0,0 +1,43 @@
+#include "flight_app.h"
+
+void System_Init(AppState *state) {
+    SensorRawData raw;
+    Sensor_Init(&raw);
+    Filter_Init(&state->sensor);
+    Control_Init(&state->command);
+    Actuator_Init(&state->actuator);
+    Diag_Init(&state->diagnostic);
+    Comm_Init(&state->command);
+    Log_Init();
+    System_LoadDefaults(&state->command);
+}
+
+void System_LoadDefaults(CommandState *command) {
+    command->target_speed = 210.0f;
+    command->target_altitude = 3000.0f;
+    command->pitch_limit = 12.0f;
+    command->auto_mode = 1U;
+}
+
+void System_RunCycle(AppState *state) {
+    SensorRawData raw;
+    uint16_t status_word;
+
+    Sensor_Collect(&raw, &state->sensor);
+    Filter_Process(&state->sensor);
+    Control_Update(&state->command, &state->sensor, &state->actuator);
+    Actuator_UpdateOutputs(&state->actuator);
+    Diag_UpdateFaults(&state->diagnostic, &state->sensor, &state->actuator);
+
+    status_word = Diag_ReportStatus(&state->diagnostic);
+    Comm_SendStatus(status_word);
+    Log_RecordSample(&state->sensor);
+    if (status_word != 0U) {
+        Log_RecordFault(status_word);
+    }
+}
+
+void System_Shutdown(AppState *state) {
+    Actuator_Disarm(&state->actuator);
+    Log_Flush();
+}