void Dealwith_RS232(void) //RS485 is also handled at here { //stc_ring_buf_t *pstcBuffRing_Rcv = &g_stcBuffRing_Remote232_Rcv; _stc_rs232_info *pstcUart; //_stc_rs232_info *pstcRS232 = &g_stcRS232; uint8_t uart; for(uart=0; uart<2; uart++) //COM_RS232, COM_RS485 { if(COM_RS485 == uart) pstcUart = &g_stcRS485; else pstcUart = &g_stcRS232; if (pstcUart->unSend.u64Data)//if (g_stcRS232.unSend.u64Data) { pstcUart->State = STATE_REMOTE_SENDING; //g_stcRS232.State = STATE_REMOTE_SENDING; Dealwith_RS232_Send(uart);//Dealwith_RS232_Send(); } if (STATE_REMOTE_SENDING == pstcUart->State) break; //return; /* buffer ring pop out */ if (!BufferRing_RS232_Popout(uart, pstcUart))//if (!BufferRing_RS232_Popout(pstcBuffRing_Rcv, pstcRS232)) { return; } /* get cmd type and switch to branch */ switch(GetCmd_RS232(pstcUart))//switch(GetCmd_RS232(pstcRS232)) { case CMD_USER_GET_VERSION: RecvFromRS232_User_Get_Version(pstcUart);//RecvFromRS232_User_Get_Version(pstcRS232); break; case CMD_USER_GET_SN: RecvFromRS232_User_Get_SerialNbr(pstcUart);//RecvFromRS232_User_Get_SerialNbr(pstcRS232); break; #ifdef APP_LED case CMD_USER_STANDBY_IN: RecvFromRS232_User_Standby_In(pstcUart); break; case CMD_USER_STANDBY_OUT: RecvFromRS232_User_Standby_Out(pstcUart); break; case CMD_USER_BRIGHTNESS_GET: RecvFromRS232_User_Brightness_Get(pstcUart); break; case CMD_USER_BRIGHTNESS_SET: RecvFromRS232_User_Brightness_Set(pstcUart); break; case CMD_USER_BRIGHTNESS_DECREASE: RecvFromRS232_User_Brightness_Decrease(pstcUart); break; case CMD_USER_BRIGHTNESS_INCREASE: RecvFromRS232_User_Brightness_Increase(pstcUart); break; #endif case CMD_USER_DATE_SET: RecvFromRS232_User_Date_Set(pstcUart); break; case CMD_USER_DATE_GET: RecvFromRS232_User_Date_Get(pstcUart); break; case CMD_USER_TIME_SET: RecvFromRS232_User_Time_Set(pstcUart); break; case CMD_USER_TIME_GET: RecvFromRS232_User_Time_Get(pstcUart); break; case CMD_MFG_TEST: RecvFromRS232_Mfg_Test(pstcUart); break; case CMD_MFG_UPDATE_BOARD: RecvFromRS232_Mfg_Update_Board(pstcUart); break; case CMD_MFG_UPDATE_PANEL: RecvFromRS232_Mfg_Update_Panel(pstcUart); break; case CMD_MFG_EEPROM: RecvFromRS232_Mfg_Eeprom(pstcUart); break; case CMD_MFG_BEEPER: RecvFromRS232_Mfg_Beeper(pstcUart); break; case CMD_MFG_EXIT: RecvFromRS232_Mfg_Exit(pstcUart); break; //kk case CMD_OTA_INIT: RecvFromRS232_OTA_Init(pstcUart); break; default: RecvFromRS232_Invalid_Cmd_Param(pstcUart); break; } g_stcRS232.State = STATE_REMOTE_IDLE; return; } } 怎么让BufferRing_RS232_Popout(uart, pstcUart)时，要等到uart=1时，才能return

要实现这个功能，可以在for循环外面加一个变量flag，在for循环里面进行判断，如果uart等于1并且BufferRing_RS232_Popout返回false，就让flag等于1。然后在for循环结束后，再加一个判断，如果flag等于1，就return。代码示例：

void Dealwith_RS232(void)
{
    _stc_rs232_info *pstcUart;
    uint8_t uart;
    int flag = 0; // 新增变量flag
    for(uart=0; uart<2; uart++)
    {
        if(COM_RS485 == uart)
            pstcUart = &g_stcRS485;
        else
            pstcUart = &g_stcRS232;

        if (pstcUart->unSend.u64Data)
        {
            pstcUart->State = STATE_REMOTE_SENDING;
            Dealwith_RS232_Send(uart);
        }

        if (STATE_REMOTE_SENDING == pstcUart->State)
            break;

        if (!BufferRing_RS232_Popout(uart, pstcUart))
        {
            if (uart == 1) // 判断是否是最后一个uart
                flag = 1; // 如果是最后一个uart并且BufferRing_RS232_Popout返回false，flag等于1
            continue;
        }

        switch(GetCmd_RS232(pstcUart))
        {
            // ...
        }

        g_stcRS232.State = STATE_REMOTE_IDLE;
        if (uart == 1 && flag == 1) // 判断是否是最后一个uart并且flag等于1
            return;
    }
}