有关gsm模块接受短信的问题

春风悠悠 · 发表于 2013-10-31 10:41:30

这个是原子哥写的gsm模块读短信函数，我想把它改成接收到一条短信后蜂鸣器长响，需要怎么改？求解~~~~~
void sim900a_sms_read_test(void)
{
    u8 *p,*p1,*p2;
    u8 timex=0;
    u8 msgindex[3];
    u8 msglen=0;
    u8 msgmaxnum=0;        //短信最大条数
    u8 key=0;
    u8 smsreadsta=0;    //是否在短信显示状态
    p=mymalloc(SRAMIN,200);//申请200个字节的内存
    LCD_Clear(WHITE);
    POINT_COLOR=RED;
    Show_Str_Mid(0,30,"ATK-SIM900A 读短信测试",16,240);
    Show_Str(30,50,200,16,"读取:     总信息:",16,0);
    kbd_fn_tbl[0]="读取";
    kbd_fn_tbl[1]="返回";
    sim900a_load_keyboard(0,180,(u8**)kbd_tbl1);//显示键盘
    while(1)
    {
        key=sim900a_get_keynum(0,180);
        if(key)
        {
            if(smsreadsta)
            {
                LCD_Fill(30,75,239,179,WHITE);//清除显示的短信内容
                smsreadsta=0;
            }
            if(key<10||key==11)
            {
                if(msglen<2)
                {
                    msgindex[msglen++]=kbd_tbl[key-1][0];
                    u2_printf("AT+CLDTMF=2,\"%c\"\r\n",kbd_tbl[key-1][0]);
                }
                if(msglen==2)
                {
                    key=(msgindex[0]-'0')*10+msgindex[1]-'0';
                    if(key>msgmaxnum)
                    {
                        msgindex[0]=msgmaxnum/10+'0';
                        msgindex[1]=msgmaxnum%10+'0';
                    }
                }
            }else
            {
                if(key==13)if(msglen)msglen--;//删除
                if(key==14&&msglen)//执行读取短信
                {
                    LCD_Fill(30,75,239,179,WHITE);//清除之前的显示
                    sprintf((char*)p,"AT+CMGR=%s",msgindex);
                    if(sim900a_send_cmd(p,"+CMGR:",200)==0)//读取短信
                    {
                        POINT_COLOR=RED;
                        Show_Str(30,75,200,12,"状态:",12,0);
                        Show_Str(30+75,75,200,12,"来自:",12,0);
                        Show_Str(30,90,200,12,"接收时间:",12,0);
                        Show_Str(30,105,200,12,"内容:",12,0);
                        POINT_COLOR=BLUE;
                        if(strstr((const char*)(USART2_RX_BUF),"UNREAD")==0)Show_Str(30+30,75,200,12,"已读",12,0);
                        else Show_Str(30+30,75,200,12,"未读",12,0);
                        p1=(u8*)strstr((const char*)(USART2_RX_BUF),",");
                        p2=(u8*)strstr((const char*)(p1+2),"\"");
                        p2[0]=0;//加入结束符
                        sim900a_unigbk_exchange(p1+2,p,0);            //将unicode字符转换为gbk码
                        Show_Str(30+75+30,75,200,12,p,12,0);        //显示电话号码
                        p1=(u8*)strstr((const char*)(p2+1),"/");
                        p2=(u8*)strstr((const char*)(p1),"+");
                        p2[0]=0;//加入结束符
                        Show_Str(30+54,90,200,12,p1-2,12,0);        //显示接收时间
                        p1=(u8*)strstr((const char*)(p2+1),"\r");    //寻找回车符
                        sim900a_unigbk_exchange(p1+2,p,0);            //将unicode字符转换为gbk码
                        Show_Str(30+30,105,180,75,p,12,0);            //显示短信内容
                        smsreadsta=1;                                //标记有显示短信内容
                    }else
                    {
                        Show_Str(30,75,200,12,"无短信内容!!!请检查!!",12,0);
                        delay_ms(1000);
                        LCD_Fill(30,75,239,75+12,WHITE);//清除显示
                    }
                    USART2_RX_STA=0;
                }
                if(key==15)break;
            }
            msgindex[msglen]=0;
            LCD_Fill(30+40,50,86,50+16,WHITE);
            Show_Str(30+40,50,86,16,msgindex,16,0); //键盘输入数字
        }
        if(timex==0)        //2.5秒左右更新一次
        {
            if(sim900a_send_cmd("AT+CPMS?","+CPMS:",200)==0)    //查询优选消息存储器
            {
                p1=(u8*)strstr((const char*)(USART2_RX_BUF),",");
                p2=(u8*)strstr((const char*)(p1+1),",");
                p2[0]='/';
                if(p2[3]==',')//小于64K SIM卡，最多存储几十条短信
                {
                    msgmaxnum=(p2[1]-'0')*10+p2[2]-'0';        //获取最大存储短信条数
                    p2[3]=0;
                }else //如果是64K SIM卡，则能存储100条以上的信息
                {
                    msgmaxnum=(p2[1]-'0')*100+(p2[2]-'0')*10+p2[3]-'0';//获取最大存储短信条数
                    p2[4]=0;
                }
                sprintf((char*)p,"%s",p1+1);
                Show_Str(30+17*8,50,200,16,p,16,0);
                USART2_RX_STA=0;
            }
        }
        if((timex%20)==0)LED0=!LED0;//200ms闪烁
        timex++;
        delay_ms(10);
        if(USART2_RX_STA&0X8000) //检查从GSM模块接收到的数据
        {
            //BEEP=1;
            sim_at_response(1);
        }
    }
    myfree(SRAMIN,p);
}