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,要求最后有整体代码,条理清晰
时间: 2024-03-18 20:39:06 浏览: 19
由于RT-Thread是一个实时操作系统,可以方便地实现多线程应用,因此我们可以使用RT-Thread来实现上述要求。下面是实现的代码,分为4个线程:发送AT命令线程、传感器数据生成线程、总线数据接收线程和传感器数据处理线程。同时,我们还需要定义全局数组和信号量,以及事件集。
```c
#include <rtthread.h>
#define AT_CMD_LEN 10
#define AT_DATA_LEN 20
static char at_cmd[AT_CMD_LEN]; // 全局数组,保存AT命令
static char at_data[AT_DATA_LEN]; // 全局数组,保存传感器数据帧
static rt_sem_t semap_at_cmd; // 信号量,保护at_cmd数组
static rt_sem_t semap_at_data; // 信号量,保护at_data数组
static rt_event_t event; // 事件集,用于传感器数据处理线程之间的同步
static rt_thread_t thread_send_at_cmd; // 发送AT命令线程
static rt_thread_t thread_gen_sensor_data; // 传感器数据生成线程
static rt_thread_t thread_recv_bus_data; // 总线数据接收线程
static rt_thread_t thread_process_sensor_data1; // 传感器1数据处理线程
static rt_thread_t thread_process_sensor_data2; // 传感器2数据处理线程
static void send_at_cmd(void* parameter);
static void gen_sensor_data(void* parameter);
static void recv_bus_data(void* parameter);
static void process_sensor_data1(void* parameter);
static void process_sensor_data2(void* parameter);
void app_thread_entry(void* parameter)
{
// 初始化信号量和事件集
rt_sem_init(&semap_at_cmd, "Semap AT Cmd", 1, RT_IPC_FLAG_FIFO);
rt_sem_init(&semap_at_data, "Semap AT Data", 1, RT_IPC_FLAG_FIFO);
rt_event_init(&event, "Event", RT_IPC_FLAG_FIFO);
// 创建线程
thread_send_at_cmd = rt_thread_create("Send AT Cmd", send_at_cmd, RT_NULL, 512, 10, 10);
thread_gen_sensor_data = rt_thread_create("Gen Sensor Data", gen_sensor_data, RT_NULL, 512, 9, 10);
thread_recv_bus_data = rt_thread_create("Recv Bus Data", recv_bus_data, RT_NULL, 512, 8, 10);
thread_process_sensor_data1 = rt_thread_create("Process Sensor Data1", process_sensor_data1, RT_NULL, 512, 7, 10);
thread_process_sensor_data2 = rt_thread_create("Process Sensor Data2", process_sensor_data2, RT_NULL, 512, 6, 10);
// 启动线程
rt_thread_startup(thread_send_at_cmd);
rt_thread_startup(thread_gen_sensor_data);
rt_thread_startup(thread_recv_bus_data);
rt_thread_startup(thread_process_sensor_data1);
rt_thread_startup(thread_process_sensor_data2);
}
static void send_at_cmd(void* parameter)
{
while (1)
{
rt_sem_take(&semap_at_cmd, RT_WAITING_FOREVER); // 获取信号量
// 发送AT命令
if (rand() % 2 == 0)
{
rt_kprintf("Send AT command: read sensor data1\n");
strcpy(at_cmd, "read sensor data1");
}
else
{
rt_kprintf("Send AT command: read sensor data2\n");
strcpy(at_cmd, "read sensor data2");
}
rt_sem_release(&semap_at_cmd); // 释放信号量
rt_thread_delay(5 * RT_TICK_PER_SECOND); // 每5秒发送一次AT命令
}
}
static void gen_sensor_data(void* parameter)
{
while (1)
{
rt_sem_take(&semap_at_cmd, RT_WAITING_FOREVER); // 获取信号量
// 读取AT命令
char* cmd = rt_strdup(at_cmd);
rt_sem_release(&semap_at_cmd); // 释放信号量
// 根据AT命令生成传感器数据帧
int r = rand() % 255;
if (strcmp(cmd, "read sensor data1") == 0)
{
rt_kprintf("Generate sensor data1 frame: %d\n", r);
sprintf(at_data, "sensor data1: %d", r);
}
else if (strcmp(cmd, "read sensor data2") == 0)
{
rt_kprintf("Generate sensor data2 frame: %d\n", r);
sprintf(at_data, "sensor data2: %d", r);
}
rt_free(cmd);
rt_sem_take(&semap_at_data, RT_WAITING_FOREVER); // 获取信号量
// 写入传感器数据帧
strcpy(at_data, at_data);
rt_sem_release(&semap_at_data); // 释放信号量
rt_thread_delay(r * RT_TICK_PER_SECOND); // 延迟随机时间,模拟传感器数据生成
}
}
static void recv_bus_data(void* parameter)
{
while (1)
{
rt_sem_take(&semap_at_data, RT_WAITING_FOREVER); // 获取信号量
// 读取传感器数据帧
char* data = rt_strdup(at_data);
rt_sem_release(&semap_at_data); // 释放信号量
rt_event_send(&event, 1); // 发送事件,通知数据处理线程有新数据到达
// 等待事件,如果超时则认为总线数据接收超时
if (rt_event_recv(&event, 1, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, RT_TICK_PER_SECOND) != RT_EOK)
{
rt_kprintf("Bus data receive timeout!\n");
}
else
{
rt_kprintf("Received bus data: %s\n", data);
}
rt_free(data);
}
}
static void process_sensor_data1(void* parameter)
{
while (1)
{
// 等待事件,如果超时则认为传感器数据1处理超时
if (rt_event_recv(&event, 1, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, RT_TICK_PER_SECOND) != RT_EOK)
{
rt_kprintf("Sensor data 1 process timeout!\n");
}
else
{
rt_sem_take(&semap_at_data, RT_WAITING_FOREVER); // 获取信号量
// 读取传感器数据帧
char* data = rt_strdup(at_data);
rt_sem_release(&semap_at_data); // 释放信号量
// 处理传感器数据1
if (strstr(data, "sensor data1") != NULL)
{
rt_kprintf("Process sensor data1: %s\n", data);
}
rt_free(data);
}
}
}
static void process_sensor_data2(void* parameter)
{
while (1)
{
// 等待事件,如果超时则认为传感器数据2处理超时
if (rt_event_recv(&event, 1, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, RT_TICK_PER_SECOND) != RT_EOK)
{
rt_kprintf("Sensor data 2 process timeout!\n");
}
else
{
rt_sem_take(&semap_at_data, RT_WAITING_FOREVER); // 获取信号量
// 读取传感器数据帧
char* data = rt_strdup(at_data);
rt_sem_release(&semap_at_data); // 释放信号量
// 处理传感器数据2
if (strstr(data, "sensor data2") != NULL)
{
rt_kprintf("Process sensor data2: %s\n", data);
}
rt_free(data);
}
}
}
```
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