做一个项目，需要使用单片机控制GSM模块收发短信

#include "serial.h"

#include "bianliang.h"

#include <REG51.h>

#include <string.h>

#include "1602.H"

#define rev_FAUSE 0

#define rev_OK 1

#define SELInt_on() ES=1

#define SELInt_off() ES=0

uchar temp[3];

unsigned long ss;

extern bit P0_0;

extern bit P0_1;

extern bit P0_2;

extern bit P0_3;

extern bit P0_4;

extern bit P0_5;

extern bit P0_6;

extern bit P0_7;

sbit P0_0=P0^0;

sbit P0_1=P0^1;

sbit P0_2=P0^2;

sbit P0_3=P0^3;

sbit P0_4=P0^4;

sbit P0_5=P0^5;

sbit P0_6=P0^6;

sbit P0_7=P0^7;

sbit P1_0=P1^0;

sbit P1_1=P1^1;

sbit P1_2=P1^2;

sbit P1_3=P1^3;

sbit P1_4=P1^4;

sbit P1_5=P1^5;

sbit P1_6=P1^6;

sbit P1_7=P1^7;

sbit P2_0=P2^0;

sbit P2_1=P2^1;

sbit P2_2=P2^2;

sbit P2_3=P2^3;

void delay1(int n)

{

uchar i;

while(n--)

for(i=0;i<100;i++);

}

void Excrescent(void)

{

if(Rev_Buf[0]==0x00)

xx=1;

else

xx=0;

}

void gsm_Over(void)

{

Ser_TxDchar(0x0d);

Ser_TxDchar(0x0a);

}

void Cls_Rebuf(void)

{

unsigned char i;

for(i=0;i<Rev_BufSIZE+1;i++)

{

Rev_Buf[i]=0;

}

Rev_count=0;

}

Test_Mc39i(void)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,2);//发送AT

gsm_Over();//回车换行

SELInt_on();

while(Rev_count<9);

Rev_count=0;

Excrescent();

for(i=5+xx;i<7+xx;i++)

{

temp[i-5-xx]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

}

MES_Mode(unsigned char mode)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CMGF,5);

Ser_TxDchar(mode+0x30);

gsm_Over();

SELInt_on();

while(Rev_count<15);

Rev_count=0;

Excrescent();

for(i=12+xx;i<14+xx;i++)

{

temp[i-12-xx]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

}

Set_Speed(void)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_IPR,8);

gsm_Over();

SELInt_on();

while(Rev_count<18);

Rev_count=0;

Excrescent();

for(i=14+xx;i<16+xx;i++)

{

temp[i-14-xx]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

}

Sent_Mes(unsigned char *p)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CMGS,5);

Ser_TxDchar(0x22);

Ser_TXDstring(TelNumber,11);

Ser_TxDchar(0x22);

gsm_Over();

SELInt_on();

ss=0xffff;

while(Rev_Buf[Rev_count-1]!=0x3e)

{

ss--;

if(ss==0)

{return;}

}

SELInt_off();

Ser_TXDstring(p,5);

Ser_TxDchar(0x1a);

SELInt_on();

}

Store_Location(void)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CPMS,5);

Ser_TxDchar(0x22);

Ser_TXDstring(TC_SM,2);

Ser_TxDchar(0x22);

Ser_TxDchar(0x2C);

Ser_TxDchar(0x22);

Ser_TXDstring(TC_SM,2);

Ser_TxDchar(0x22);

Ser_TxDchar(0x2C);

Ser_TxDchar(0x22);

Ser_TXDstring(TC_SM,2);

Ser_TxDchar(0x22);

gsm_Over();

SELInt_on();

while(Rev_count<54);

Rev_count=0;

Excrescent();

for(i=50+xx;i<52+xx;i++)

{

temp[i-50-xx]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

}

Auto_Prompt(void)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CNMI,8);

gsm_Over();

SELInt_on();

while(Rev_count<17);

Rev_count=0;

Excrescent();

for(i=14+xx;i<16+xx;i++)

{

temp[i-14-xx]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

}

void New_Mes(void)

{

Excrescent();

for(i=3+xx;i<7+xx;i++)

{

temp1[i-3-xx]=Rev_Buf[i];

}

if(!strcmp(temp1,TC_CMTI))

{

if(Rev_Buf[10]==0x53&&Rev_Buf[11]==0x4D)

{

NewSMS_flag=1;

MES_COUNT=Rev_Buf[13];

Cls_Rebuf();

}

}

}

void Read_Mes(uchar num)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CMGR,5);

Ser_TxDchar(num);

gsm_Over();

SELInt_on();

ss=0xffff;

while(Rev_Buf[Rev_count-1]!=0x4B)

{

ss--;

if(ss==0)

{return;}

}

for(i=30;i<40;i++)

{

if(Rev_Buf[i]==0x2B&Rev_Buf[i+1]==0x38&Rev_Buf[i+2]==0x36)

{

t=i;

}

}

for(i=t+3;i<t+14;i++)

{

TEL_Buf[i-t-3]=Rev_Buf[i];

}

TEL_Buf[11]=0x00;

for(i=t-20;i<t-15;i++)

{

CMD_Buf[i-t+20]=Rev_Buf[i];

CMD_Buf[5]=0x00;

}

}

Del_Mes(num)

{

Cls_Rebuf();

SELInt_off();

Ser_TXDstring(TC_HEAD,3);

Ser_TXDstring(TC_CMGD,5);

Ser_TxDchar(num);

gsm_Over();

SELInt_on();

while(Rev_count<14);

Rev_count=0;

for(i=12;i<14;i++)

{

temp[i-12]=Rev_Buf[i];

}

if(!strcmp(temp,TC_OK))

return rev_OK;

else

return rev_FAUSE;

Cls_Rebuf();

}

void CMD_SHIBIE(void)

{

if(!strcmp(TEL_Buf,TelNumber))

{

P1_2=0;

TELNUM_OK=1;

}

else

{ P1_3=0;

TELNUM_OK=0;

Del_Mes(MES_COUNT);

Cls_Rebuf();

NewSMS_flag=0;

}

if(!strcmp(CMD_Buf,CMD_1))

{

CMD=1;

}

else if(!strcmp(CMD_Buf,CMD_2))

{

CMD=2;

}

else

{

CMD=0;

}

}

void INIT_GSM(void)

{

if(Test_Mc39i())

{

if(MES_Mode(1))

{

if(Set_Speed())

{

if(Store_Location())

{

if(Auto_Prompt())

P1_0=0;

}

}

}

}

Cls_Rebuf();

}

我做过一点；
（1）pc机和单片机发送的串口数据是不是不一样？
答：一样，一般都为9600，n,8,1

（2）把单片机和pc上位机相连，pc的超级终端接收的命令确实正确的？
答：可以连，注意RXD和TXD应交叉对联。满足单片机发送PC接收，PC发送MCU接收的关系

（2）是不是单片机和pc机波特率不一样？
答，GSM模块一般都是自适应模特率的，只要断电一次，就可以自己适应当前波特率

注意：你通讯补上可能是RXD和TXD交叉的问题（交换TXD和RXD尝试）
，也可能是需要硬件握手的问题（RTS  CTS