在串口中断中发送事件，线程中不接收

rt_event_t  GPS_event_set = NULL;
void main()
{
     // 部分代码 
   GPS_event_set =  rt_event_create("GPS_events", RT_IPC_FLAG_PRIO);
        tid = rt_thread_create("GPS_task",
                                                     GPS_task_entry,
                                                     RT_NULL,
                                                     GPS_STACK_SIZE,
                                                     GPS_THREAD_PRIORITY,
                                                     20);                //运行多少tick
        rt_thread_startup(tid);        
}
void GPS_task_entry(void *parameter)
{
        static rt_err_t result;
        rt_uint32_t events;
       // 初始化事件集
  //  rt_event_init(&event_set, "GPS_events", RT_IPC_FLAG_PRIO);
    while (1)
    {
//            
            // 等待任意一个事件发生
        result = rt_event_recv(GPS_event_set,
                               EVENT_NEW_NMEA | EVENT_PPS,
                               RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
                               RT_WAITING_FOREVER,
                               &events);
            if (result == RT_EOK)
        {
            // 检查哪个事件被触发
            if (events & EVENT_NEW_NMEA)
            {
              update_rtc_with_rmc_data(nmea_buffer,&rmc_data);
            }
            if (events & EVENT_PPS)
            {
                // 处理PPS信号
                handle_pps_signal();
            }
        }
    }
}
void USART5_IRQHandler(void)
{
    if (RESET != usart_interrupt_flag_get(USART5, USART_INT_FLAG_RBNE)) {
        // 从USART5的接收数据寄存器读取一个字节
        uint8_t byte = (uint8_t)usart_data_receive(USART5);
        // 将字节添加到缓冲区
        nmea_buffer[buffer_index++] = byte;
        // 检查是否到达行尾
        if (byte == 0x0A && nmea_buffer[buffer_index-2] ==0x0D ) 
                    {
            // 重置缓冲区索引
              buffer_index = 0;
                         // 处理NMEA数据
                memset(&rmc_data, 0, sizeof(RMCData));
                if (RT_EOK == parse_RMC(nmea_buffer, &rmc_data))
                                {
                                   new_nmea_data = 1;
                       rt_event_send(GPS_event_set, EVENT_NEW_NMEA);
                                }                
        }
        // 清除RBNE中断标志
        usart_interrupt_flag_clear(USART5, USART_INT_FLAG_RBNE);
    }
}