场景:上位机和下位机通信依靠总线互通编写代码模拟实现: 1) 一个线程模拟发送AT命令 在内存中定义一个全局数组，定义一个信号量Semap AT Cmd，保护全局数组AT Cmd，每5秒发送AT命令，每次交替读传感器数据1和传感器数据2，命令写入该数组。 2) 一个线程模拟传感器节点生成总线返回的数据 获取Semap AT Cmd后，读取全局数组AT Cmd; 调用r = rand0%255;(#include <stdlib.h>) 生成一个随机延迟； 根据命令将模拟传感器数据帧写入全局数组AT Data通过信号量Semap AT Data与其他线程同步 AT Data的读写. 3)一个线程模拟接收总线数据 获取到信号量Semap AT Data后，读取AT Data； 在未超时收到数据时，该线程通过事件集Event与数据处理线程同步 4) 两个线程处理传感器数据 通过事件集Event同步，分别处理传感器1/2数据 基于RT-Thread实现上述要求，要求条理清晰

以下是基于RT-Thread实现上述要求的代码。由于没有具体的传感器数据和总线协议，本代码仅提供了一个基于信号量、事件集和全局数组的通信框架，需要根据实际情况进行修改和调试。

#include <rtthread.h>
#include <stdlib.h>

#define AT_CMD_LEN 128
#define AT_DATA_LEN 256

char at_cmd[AT_CMD_LEN];  // AT命令全局数组
char at_data[AT_DATA_LEN];  // 传感器数据全局数组
rt_sem_t semap_at_cmd;  // 信号量，保护AT命令全局数组
rt_sem_t semap_at_data;  // 信号量，保护传感器数据全局数组
rt_event_t event_data_ready;  // 事件集，用于传感器数据处理线程同步

static void send_at_cmd_thread_entry(void* parameter)
{
    int i = 0;
    while (1) {
        rt_sem_take(&semap_at_cmd, RT_WAITING_FOREVER);  // 获取信号量，保护全局数组
        if (i % 2 == 0) {
            // 交替读取传感器数据1
            snprintf(at_cmd, AT_CMD_LEN, "AT+GETDATA1\r\n");
        } else {
            // 交替读取传感器数据2
            snprintf(at_cmd, AT_CMD_LEN, "AT+GETDATA2\r\n");
        }
        rt_sem_release(&semap_at_cmd);  // 释放信号量，保护全局数组
        i++;

        // 模拟发送AT命令
        rt_kprintf("Sending AT command: %s", at_cmd);
        // TODO: 在总线上发送AT命令
        rt_thread_mdelay(5000);
    }
}

static void gen_sensor_data_thread_entry(void* parameter)
{
    while (1) {
        rt_sem_take(&semap_at_cmd, RT_WAITING_FOREVER);  // 获取信号量，保护全局数组
        char cmd[AT_CMD_LEN];
        strncpy(cmd, at_cmd, AT_CMD_LEN);  // 复制AT命令，避免在读取时被修改
        rt_sem_release(&semap_at_cmd);  // 释放信号量，保护全局数组

        // 模拟生成传感器数据
        int r = rand() % 255;
        rt_thread_mdelay(r);  // 模拟随机延迟
        snprintf(at_data, AT_DATA_LEN, "Sensor data for command %s: %d", cmd, r);
        rt_sem_release(&semap_at_data);  // 释放信号量，通知数据处理线程
    }
}

static void recv_bus_data_thread_entry(void* parameter)
{
    int timeout = 5000;  // 超时时间为5秒
    while (1) {
        rt_sem_take(&semap_at_data, RT_WAITING_FOREVER);  // 获取信号量，保护全局数组
        // TODO: 从总线上读取数据，写入全局数组AT Data
        rt_sem_release(&semap_at_data);  // 释放信号量，保护全局数组

        // 等待数据处理线程处理数据，超时则重新等待
        rt_uint32_t recv_flag;
        rt_err_t result = rt_event_recv(&event_data_ready, 1, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, timeout, &recv_flag);
        if (result == RT_EOK) {
            // 处理数据
            if (recv_flag & 0x01) {
                // TODO: 处理传感器数据1
            }
            if (recv_flag & 0x02) {
                // TODO: 处理传感器数据2
            }
        } else if (result == -RT_ETIMEOUT) {
            rt_kprintf("Timeout while waiting for data processing thread\n");
        } else {
            rt_kprintf("Error while waiting for data processing thread\n");
        }
    }
}

static void process_sensor_data_thread_entry(void* parameter)
{
    while (1) {
        rt_uint32_t recv_flag;
        rt_event_recv(&event_data_ready, 0x03, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, RT_WAITING_FOREVER, &recv_flag);
        if (recv_flag & 0x01) {
            // TODO: 处理传感器数据1
            rt_kprintf("Processing sensor data 1: %s\n", at_data);
        }
        if (recv_flag & 0x02) {
            // TODO: 处理传感器数据2
            rt_kprintf("Processing sensor data 2: %s\n", at_data);
        }
    }
}

int sensor_data_communication_init(void)
{
    rt_sem_init(&semap_at_cmd, "Semap AT Cmd", 1, RT_IPC_FLAG_FIFO);
    rt_sem_init(&semap_at_data, "Semap AT Data", 0, RT_IPC_FLAG_FIFO);
    rt_event_init(&event_data_ready, "Event Data Ready", RT_IPC_FLAG_FIFO);

    rt_thread_t send_at_cmd_thread = rt_thread_create("Send AT Cmd", send_at_cmd_thread_entry, RT_NULL, 1024, 8, 10);
    rt_thread_t gen_sensor_data_thread = rt_thread_create("Gen Sensor Data", gen_sensor_data_thread_entry, RT_NULL, 1024, 8, 10);
    rt_thread_t recv_bus_data_thread = rt_thread_create("Recv Bus Data", recv_bus_data_thread_entry, RT_NULL, 1024, 8, 10);
    rt_thread_t process_sensor_data_thread = rt_thread_create("Process Sensor Data", process_sensor_data_thread_entry, RT_NULL, 1024, 8, 10);

    if (send_at_cmd_thread != RT_NULL) {
        rt_thread_startup(send_at_cmd_thread);
    }
    if (gen_sensor_data_thread != RT_NULL) {
        rt_thread_startup(gen_sensor_data_thread);
    }
    if (recv_bus_data_thread != RT_NULL) {
        rt_thread_startup(recv_bus_data_thread);
    }
    if (process_sensor_data_thread != RT_NULL) {
        rt_thread_startup(process_sensor_data_thread);
    }

    return RT_EOK;
}