51控制SIM900A模块接收短信不能读取

如题，用51可以控制SIM900A发短信，但是接收总是读取不了，是比较出了问题，还是中断保存函数出了问题，原子哥来帮帮忙！感谢[C] 纯文本查看 复制代码
/*作者：陈奕均时间：2015、3、4功能：实现GSM短信控制 51模块上的开关 open-灯全亮，close-灯全灭 *****************************************/#include #include#define uchar unsigned char#define uint unsigned int#define FOSC_110592M //单片机晶振//uchar SIM900A_CMti[]="+CMTI";uchar SIM900A_OPEN[]="open";uchar SIM900A_CLOSE[]="close";char read_data[70]={1,1,1,1}; // 保存串口接收到的信息uchar receiveready;void Delay1ms(uint c);//延时void SerialInit();//初始化串口void Uart1Send(uchar c); //void Uart1Sends(uchar *str); //串口发送指令void GSM_Iint();//GSM初始化void receive_ready(void); //判断是否接收到短信这个感觉有问题char *LookFor_Str(uchar *s, uchar *t); //对比短信内容void main(){ P1=0x01; GSM_Iint(); P1=0x02; Delay1ms(1000); while(1) { P1=0x04; //程序达到指示灯Uart1Sends(read_data); //发送到电脑检测 read_data receive_ready(); //等待短信到来，如到来 receiveready=1 if(receiveready) { uchar *p; P1=0x08; Uart1Sends("AT+CMGR=1rn"); //读取短信内容 Delay1ms(3000);//p=strstr(read_data,SIM900A_OPEN);//if(p!=NULL)//{P1=0XFF;Delay1ms(3000);} //p=strstr(read_data,SIM900A_CLOSE);//if(p!=NULL)//{P1=0x00; } } }}/************1毫秒延时*******/void Delay1ms(uint c) { uchar a,b;for (; c>0; c--){ for (b=199;b>0;b--) { for(a=1;a>0;a--); } } }/********************串口初始化*****/void SerialInit(){ TMOD=0x20;//定时器1模式2：10位自动重装 //补充：SIM900A的接收串口能自动识别 2400-115200//#ifdef FOSC_12M //这里根据晶振大小设置不同的数值初始化串口// TH1=0xf3; //装入初值，波特率：2400// TL1=0XF3; //#else TH1=0xFD; //装入初值，波特率：9600 TL1=0XFD; //#endif TR1=1; //打开定时器 /**********SCON=0X50;********/ SM0=0; //设置串行通讯工作模式，10为一步发送，波特率可变，又定时器1的溢出率控制 SM1=1; // 同上，溢出一次发送一位 REN=1; // 串行接受允许位（先设置SM0,SM1再开） EA=1; // 总中断 ES=1; // 串行口中断}/***************发送数据函数 Uart1Send*******/void Uart1Send(uchar c){ SBUF=c; while(!TI);//等待发送信号（TI=1）出现 TI=0;} //串行口连续发送char数组，遇到终止号将停止void Uart1Sends(uchar *str){ while(*str!='') { SBUF=*str; while(!TI); TI=0; str++; }}/*******************************************///查找字符串,在s中查找t//返回值: s_temp(t在s中的位置)成功 0失败char *LookFor_Str(uchar *s, uchar *t){uchar *s_temp; uchar *m_temp; uchar *t_temp; if (s == 0 ||t == 0) return 0;for (s_temp = s; *s_temp != ''; s_temp++){m_temp = s_temp;for (t_temp = t; *t_temp == *m_temp; t_temp++, m_temp++);if (*t_temp == '') return 1;}return 0;}/****************GSM初始化******************/void GSM_Iint(){ SerialInit(); Uart1Sends("AT+CSCS=\"GSM\"rn"); //设置GSM字符 Delay1ms(3000); Uart1Sends("AT+CMGF=1rn"); //设置TEXT文本模式 Delay1ms(3000); Uart1Sends("AT+CMGD=1,4rn"); //删除所有短信 Delay1ms(3000); Uart1Sends("AT+CNMI=2,1rn"); //新消息自动提醒 Delay1ms(3000);}void receive_ready(void)//检测是否有短信来。{uchar i,p;p=LookFor_Str(read_data,"CMTI");if(p) //如果有新短信(TI)来,模块会通过串口向单片机发送字符串,如果收到CMTI：{ //此函数的功能是判断是否有新短信来,如果来的话就置位准备接受位标志为1 receiveready=1;P1=0x10;Delay1ms(3000);}else{ P1=0x20;Delay1ms(3000);for(i=0;i<70;i++){read_data=0x00;}}}/*************串口中断接受数据存入read_data[70]*****/ void Serial_interrupt() interrupt 4{ int i=0; EA=0; if(RI) { if(i<70) { read_data[i++]=SBUF; } RI=0; EA=1; }} 本人QQ：328580842，谢了！

李欣

2019-5-10 08:20:15

51+sim900a接收发送短信代码
[C] 纯文本查看 复制代码
/**************http://tpytongxin.taobao.com/****************/#include #include #include #include #define uint unsigned int#define uchar unsigned char***it Send_ENGLISH_key=P3^2; //·?????TEXT????°??ü***it Send_CALLING_key=P3^3; //?ò???°°??ü***it Send_DS18B20_key=P3^4; //·?????°??ü***it Send_SMS_PDU_key=P3^5; //·?????PDU????°??ü#define MAXCHAR 81uchar aa[MAXCHAR];code uchar ATE0[]="ATE0rn";code uchar CREG_CMD[]="AT+CREG?rn";code uchar SMS_send[]="AT+CMGS=18rn";code uchar ATCN[]="AT+CNMI=2,1rn";code uchar CMGF0[]="AT+CMGF=0rn";code uchar CMGF1[]="AT+CMGF=1rn";code uchar CMGR[12]="AT+CMGR=1rn";code uchar CMGD[12]="AT+CMGD=1rn";#define CALL_YOU_TELNUMBER "ATD18622900000;rn" //???????????????ú???? ????°?×???#define SEND_MESSA_TO_YOUR "at+cmgs=\"1862200000\"rn" //???????????????ú???? ????°?×???#define SEND_MESSA_CONTENT "warning"***it JIDIANQI=P1^0;***it FENGMINGQI=P1^1;uchar a,j=0,flag=0;int g_timeout=0;void delay(uint ms)// ???±×????ò{ uchar i; while(ms--) { for(i=0;i<120;i++); }}/***********************************************************??????????Print_Char??????????·???????×?·? ????????:ch ????????????***********************************************************/Print_Char(uchar ch)//·???????×?·?{ SBUF=ch; //?????????? while(TI!=1); //????·????ê±? TI=0; //?í??????}/***********************************************************??????????Print_Str??????????·???×?·??® ????????:*str ????????????***********************************************************/Print_Str(uchar *str)//·???×?·??®{ while(*str!='') { Print_Char(*str); delay(2); str++; }}/***********************************************************??????????Ini_UART???????????®???????????¨?±?÷?????? ????????:?? ????????????***********************************************************/Ini_UART(void)//?®???????????¨?±?÷??????{ SCON = 0x50 ; //SCON: serail mode 1, 8-bit UART, enable ucvr //UART??????1??8???????????í???? TMOD |= 0x20 ; //TMOD: timer 1, mode 2, 8-bit reload //?¨?±?÷1??????2,8??×?????×° PCON |= 0x80 ; //SMOD=1; TH1 = 0xFA ; //Baud:19200 fosc="11".0592MHz TL1=0xFA; IE |= 0x90 ; //Enable Serial Interrupt TR1 = 1 ; // timer 1 run TI=1; ES=1;}void clearBuff(void){ for(j=0;j50) { g_timeout=0; return -1; } g_timeout++; return 0;}void AT(void){ clearBuff(); Print_Str(ATE0); delay(50); while(strstr(aa,"OK")==NULL) { delay(50); led(0x01); clearBuff(); Print_Str(ATE0); } led(0x02); Print_Str(ATCN); delay(50); while(1) { clearBuff(); Print_Str(CREG_CMD); delay(50); if(((aa[9]=='0')&&(aa[11]=='1'))||((aa[9]=='0')&&(aa[11]=='5'))) { clearBuff(); led(0x08); break; } else { clearBuff(); led(0x04); delay(50); } }}void send_english(){ P2=0XFF; clearBuff(); Print_Str(CMGF1); delay(100); led(0x01); Print_Str(SEND_MESSA_TO_YOUR); delay(300); led(0x02); Print_Str(SEND_MESSA_CONTENT); //·????????? delay(10); Print_Char(0x1A); //·????á??·??? delay(10); led(0x04); clearBuff();delay(3000);delay(3000);}void send_call(){ clearBuff(); delay(100); Print_Str(CALL_YOU_TELNUMBER); //?ò???° clearBuff(); delay(3000);delay(3000);}void main(){ Ini_UART(); //???????®?? AT(); //?????????é delay(10); Send_ENGLISH_key=1; //·?????TEXT????°??ü Send_CALLING_key=1; //?ò???°°??ü Send_DS18B20_key=1; //·?????°??ü Send_SMS_PDU_key=1; //·?????PDU????°??ü clearBuff(); Print_Str(CMGD); delay(50); while(Hand()==0); clearBuff(); Print_Str(CMGF1); delay(30); Print_Str(ATCN); delay(30); send_english(); while(1) { //////////////////////////////////////////////////////////////////////// if(Send_ENGLISH_key==0) //·?????TEXT????°??ü { send_english(); } else if(Send_CALLING_key==0) //?ò???°°??ü { send_call(); } else if(Send_SMS_PDU_key==0) { } if(strstr(aa,"RING")!=NULL) { FENGMINGQI=0; delay(2); clearBuff(); } else { FENGMINGQI=1; } if(strstr(aa,"+CMTI")!=NULL) //????????+CMTI×?·? { clearBuff(); Print_Str(CMGF1); delay(50); while(Hand()==0); clearBuff(); Print_Str(CMGR); //????1???????????? delay(100); if(strstr(aa,"k11")!=NULL) { JIDIANQI=0; } else if(strstr(aa,"k10")!=NULL) { JIDIANQI=1; } clearBuff(); Print_Str(CMGD); delay(50); while(Hand()==0); clearBuff(); } //////////////////////////////////////////////////////////////////////// }}void ser() interrupt 4{ if(RI==1) { aa[j]=SBUF;//?ü???????ü????×é RI=0; //?í?????????????? j++; }}