1、设计需求及目标
本系统由STC89C52单片机电路+GPS模块电路+GSM模块SIM800A+指示灯电路+电源电路组成。
1、系统上电后，系统向特定手机号码发送短信,短信内容为系统的当前经纬度信息。40s左右发一次。
2、如果需要立刻发送经纬度信息，直接按板载按键即可立刻发送经纬度数据，不用等待40s。
3、短信发送及初始化有状态指示灯指示。
4、GSM模块是SIM800A，该模块和SIM900A电路程序完全兼容外观外形一模一样
2、设计思路及方案
本系统具体框图如下图所示：
硬件电路如图：
3、部分代码
#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#include "delay.h"
/**The UART1 stage1**/
#define STAGE_SOHE 0x01
#define STAGE_TYPE 0x02
#define STAGE_NONE 0x03
#define STAGE_DATA 0x04
#define INIT 0xFF
#define TRUE 0x00
#define FALSE 0x01
sbit LED = P1^0;//指示灯
sbit key =P2^0;//按键
unsigned char Lin0_No[13]="N:000.000000";//显示北纬
unsigned char Lin1_Ea[12]="E:000.000000";//显示东经
unsigned long xdata time_20ms=0;
unsigned char xdata devide_flag; //GPS数据逗号分隔符
unsigned char xdata speed_end; //收速度数据结束标志
unsigned char xdata dir_end; //收方向角数据结束标志
unsigned char xdata sysmode_GPS=FALSE; //gps有效无效标志
unsigned char xdata ew_flag; //东西标志
unsigned char xdata ns_flag; //南北标志
unsigned char xdata gps_infor_weijing[17]; //暂存经纬度 格式是以度分秒的是形式
unsigned char xdata gps_infor_speed[4]; //暂存速率
unsigned char xdata gps_infor_time[6]; //时间暂存
unsigned char xdata gps_infor_date[6]; //日期暂存
unsigned char xdata gps_infor_dir[3]; //方向暂存
unsigned char xdata recv1_step=STAGE_SOHE; //串口接收指令步骤
unsigned char xdata uart1_r_buf; //串口的缓存
unsigned char xdata rev1_buf_busy; //串口接收忙碌标志
unsigned char xdata temp1_buf[85]; //串口接收数组
unsigned int xdata record1=0; //串口接收计数
unsigned char i ;
unsigned char dealGpsMes=FALSE; //gps定时处理标志
unsigned char reportTime = 0;//短信上报时间 计数
void Init_Timer0(void);//函数声明
void gpsDealfun(void);
void uartSendStr(unsigned char *s,unsigned char length);
void UART_Init(void);
void uartSendByte(unsigned char dat);
void main (void)
{
Init_Timer0(); //定时器0初始化
UART_Init(); //串口初始化
LED = 0; //打开led
key = 1;
for(i=0;i<50;i++) //延时有助于稳定
{DelayMs(100);}
uartSendStr("aAT+CMGF=1\r\n",12); //初始化gsm模块
for(i=0;i<7;i++) //延时有助于稳定
{DelayMs(100);}
uartSendStr("AT+CSCS=\"GSM\"\r\n",15);
for(i=0;i<7;i++) //延时有助于稳定
{DelayMs(100);}
LED =1;
while(1) //主循环
{
if(dealGpsMes==TRUE) //gps信息处理
{
dealGpsMes=FALSE; //清除标志
gpsDealfun(); //gps信息处理函数
}
if((reportTime >= 20)||(key == 0)) //2s计数一次
{
reportTime = 0;
LED=0; //打开led
uartSendStr("AT+CMGF=1\r\n",11); //设置字符集
for(i=0;i<5;i++)
{DelayMs(100);}
uartSendStr("AT+CSCS=\"GSM\"\r\n",15); //设置
for(i=0;i<5;i++)
{DelayMs(100);}
uartSendStr("AT+CMGS=\"+8618105140357\"\r\n",26); //可以修改电话号码
// uartSendStr("AT+CMGS=\"+8617686988225\"\r\n",26); //可以修改电话号码
for(i=0;i<3;i++)
{DelayMs(100);}
uartSendStr(Lin0_No,13);//发送短信内容 在gps数据处理情况
uartSendStr(Lin1_Ea,12);
for(i=0;i<2;i++)
{DelayMs(100);}
uartSendByte(0x1a); //发送
for(i=0;i<40;i++)
{DelayMs(100);}
LED =1; //关闭led
}
DelayMs(5);
}
}
void gpsDealfun(void)
{
unsigned char num=0;
unsigned long Mid_Du; //中间变量 暂存经纬度的整数部分 即度
unsigned long Mid_Fen; //中间变量 暂存经纬度的小数部分 即分 gps原始数据是度分秒格式
unsigned long Mid_Vale; ////中间变量 暂存经纬度 并将其扩大了10000000倍
if(sysmode_GPS==TRUE) //检测gps是否有效数据
{
sysmode_GPS=FALSE; //清除有效位
Mid_Du=(gps_infor_weijing[0]-0x30)*10000000+(gps_infor_weijing[1]-0x30)*1000000; //处理纬度 暂存整数部分扩大10000000
Mid_Fen=(gps_infor_weijing[2]-0x30)*10000000+(gps_infor_weijing[3]-0x30)*1000000+
(gps_infor_weijing[4]-0x30)*100000+(gps_infor_weijing[5]-0x30)*10000+
(gps_infor_weijing[6]-0x30)*1000+(gps_infor_weijing[7]-0x30)*100; //处理纬度 暂存小数部分扩大10000000
Mid_Fen=Mid_Fen/60; //分秒换算为小数位
Mid_Vale=Mid_Du+Mid_Fen; //最终纬度 格式为000.00000000 非度分秒格式
Lin0_No[0]='N';
Lin0_No[1]='N';
Lin0_No[2]=':';
Lin0_No[3]='0';
Lin0_No[4]=Mid_Vale/10000000+0x30; //将处理后的纬度填入字符串 并打印显示
Lin0_No[5]=(Mid_Vale/1000000)%10+0x30;
Lin0_No[6]='.';
Lin0_No[7]=(Mid_Vale/100000)%10+0x30;
Lin0_No[8]=(Mid_Vale/10000)%10+0x30;
Lin0_No[9]=(Mid_Vale/1000)%10+0x30;
Lin0_No[10]=(Mid_Vale/100)%10+0x30;
Lin0_No[11]=(Mid_Vale/10)%10+0x30;
Lin0_No[12]=Mid_Vale%10+0x30;
Mid_Du=(gps_infor_weijing[8]-0x30)*100000000+(gps_infor_weijing[9]-0x30)*10000000+(gps_infor_weijing[10]-0x30)*1000000; //处理经度 暂存整数部分扩大10000000
Mid_Fen=(gps_infor_weijing[11]-0x30)*10000000+(gps_infor_weijing[12]-0x30)*1000000+
(gps_infor_weijing[13]-0x30)*100000+(gps_infor_weijing[14]-0x30)*10000+
(gps_infor_weijing[15]-0x30)*1000+(gps_infor_weijing[16]-0x30)*100; //处理经度 暂存小数部分扩大10000000
Mid_Fen=Mid_Fen/60; //分秒换算为小数位
Mid_Vale=Mid_Du+Mid_Fen; //最终经度 格式为000.00000000 非度分秒格式
Lin1_Ea[0]='E';
Lin1_Ea[1]=':';
Lin1_Ea[2]=Mid_Vale/100000000+0x30; //将处理后的经度填入字符串 并打印显示
Lin1_Ea[3]=(Mid_Vale/10000000)%10+0x30;
Lin1_Ea[4]=(Mid_Vale/1000000)%10+0x30;
Lin1_Ea[5]='.';
Lin1_Ea[6]=(Mid_Vale/100000)%10+0x30;
Lin1_Ea[7]=(Mid_Vale/10000)%10+0x30;
Lin1_Ea[8]=(Mid_Vale/1000)%10+0x30;
Lin1_Ea[9]=(Mid_Vale/100)%10+0x30;
Lin1_Ea[10]=(Mid_Vale/10)%10+0x30;
Lin1_Ea[11]=Mid_Vale%10+0x30;
}
else
{
Lin1_Ea[0]='G'; //无gps信号情况下 打印正在连接
Lin1_Ea[1]='P';
Lin1_Ea[2]='S';
Lin1_Ea[3]=' '; /*将处理后的纬度填入字符串 并打印显示*/
Lin1_Ea[4]='L';
Lin1_Ea[5]='I';
Lin1_Ea[6]='N';
Lin1_Ea[7]='K';
Lin1_Ea[8]='I';
Lin1_Ea[9]='N';
Lin1_Ea[10]='G';
Lin1_Ea[11]='.';Lin1_Ea[12]='.';Lin1_Ea[13]='.';
for(i=0;i<14;i++)
{
Lin0_No[i]=Lin1_Ea[i];
}
}
// DelayMs(10);
// SendStr(Lin0_No,12);
// DelayMs(10);
// SendStr(Lin1_Ea,12);
}
void Init_Timer0(void)
{
TMOD |= 0x01; //使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响
TH0 = 0x0B8; //11.0592M 20ms
TL0 = 0x00;
EA=1; //总中断打开
ET0=1; //定时器中断打开
TR0=1; //定时器开关打开
}
void Timer0_isr(void) interrupt 1
{
TH0 = 0x0B8; //11.0592M 20ms
TL0 = 0x00;
time_20ms++;
if(time_20ms%100==0) //2s左右处理一次
{
dealGpsMes=TRUE;
reportTime++;
}
}
void UART_Init(void)
{
SCON = 0x50; // SCON: 模式 1, 8-bit UART, 使能接收
TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit 重装
TH1 = 0xFD; // TH1: 重装值 9600 波特率 晶振 11.0592MHz
TR1 = 1; // TR1: timer 1 打开
EA = 1; //打开总中断
ES = 1; //打开串口中断
}
void uartSendByte(unsigned char dat)
{
unsigned char time_out;
time_out=0x00;
SBUF = dat; //将数据放入SBUF中
while((!TI)&&(time_out<100)) //检测是否发送出去
{time_out++;DelayUs2x(10);} //未发送出去 进行短暂延时
TI = 0; //清除ti标志
}
void uartSendStr(unsigned char *s,unsigned char length)
{
unsigned char NUM;
NUM=0x00;
while(NUM<length) //发送长度对比
{
uartSendByte(*s); //放松单字节数据
s++; //指针++
NUM++; //下一个++
}
}
void UART_SER (void) interrupt 4 //串行中断服务程序
{
if(RI) //判断是接收中断产生
{
RI=0; //标志位清零
uart1_r_buf=SBUF; //提取buf中的值
rev1_buf_busy=0x00; //判别 放置break问题
switch(recv1_step)
{
case STAGE_SOHE: if(uart1_r_buf == '$') //判断接收到了$ 具体原因参考GPS标准协议NMEA0183
{
rev1_buf_busy=0x01;
if(uart1_r_buf == '$') //再次查看接收的是否是$
{
recv1_step=STAGE_TYPE; //跳转到下一步
record1=0; //计数清零
}
else
{
recv1_step=STAGE_SOHE; //恢复初始化
record1=0;
}
}
break;
case STAGE_TYPE: if(rev1_buf_busy == 0x00)
{
rev1_buf_busy=0x01;
temp1_buf[record1]=uart1_r_buf;
record1++;
if(record1 == 0x05)
{ //查看$GPRMC开头的命令行
if((temp1_buf[0] == 'G') && (temp1_buf[1] == 'P') && (temp1_buf[2] == 'R') && (temp1_buf[3] == 'M') && (temp1_buf[4] == 'C'))
{
recv1_step=STAGE_NONE; //跳转到下一步
record1=0;
}
else
{
recv1_step=STAGE_SOHE;//恢复初始化
record1=0;
}
}
}
break;
case STAGE_NONE: if(rev1_buf_busy == 0x00)//接收命令格式：$GPRMC,054347.00,A,3202.04770,N,11846.23632,E,0.000,0.00,221013,,,A*67
{
rev1_buf_busy=0x01;
record1++;
if((record1 > 0x01) && (record1 < 0x08))
{
gps_infor_time[record1-2]=uart1_r_buf; //时间存储
}
if((uart1_r_buf == ',') && (record1 > 0x07) && (record1 < 0x010)) //||((uart1_r_buf == ',') && (record1==0x02))
{
record1=0xcc;
}
if(record1 == 0xcd)
{
record1=0;
devide_flag=2;
speed_end=0x00;
dir_end=0x00;
if(uart1_r_buf == 'A') //gps收到数据 且有效
{
recv1_step=STAGE_DATA; //跳转到下一步
}
else
{
sysmode_GPS=FALSE;
recv1_step=STAGE_SOHE; //无效恢复初始化
record1=0;
}
}
}
break;
case STAGE_DATA: if(rev1_buf_busy == 0x00)
{
rev1_buf_busy=0x01;
record1++;
if(uart1_r_buf == ',') //判断逗号
{
devide_flag++; //逗号次数记录
record1=0;
}
if(devide_flag == 3)
{
if((record1 > 0) && (record1 < 5))
{
gps_infor_weijing[record1-1]=uart1_r_buf; //存储经纬度 此处为纬度
}
if((record1 > 5) && (record1 < 10)) //跳过小数点的存储
{
gps_infor_weijing[record1-2]=uart1_r_buf; //存储经纬度 此处为纬度
}
}
if(devide_flag == 4)
{
if(record1 > 0)
{
ns_flag=uart1_r_buf; //接收纬度NS标志
}
}
if(devide_flag == 5)
{
if((record1 > 0) && (record1 < 6))
{
gps_infor_weijing[record1+7]=uart1_r_buf; //存储经纬度 此处为纬度
}
if((record1 > 6) && (record1 < 11)) //跳过小数点的存储
{
gps_infor_weijing[record1+6]=uart1_r_buf; //存储经纬度 此处为经度
}
}
if(devide_flag == 6)
{
if(record1 > 0)
{
ew_flag=uart1_r_buf; //经度度 EW标志
}
}
if(devide_flag == 7)
{
if(speed_end == 0x00)
{
if((record1 > 0) && (uart1_r_buf != '.'))
{
gps_infor_speed[record1-1]=uart1_r_buf; //接收速率
}
else if(uart1_r_buf == '.')
{
record1--;
speed_end=0xff;
}
}
else if(speed_end == 0xff)
{
speed_end=0xfe;
gps_infor_speed[record1-1]=uart1_r_buf;
gps_infor_speed[3]=gps_infor_speed[record1-1];
gps_infor_speed[2]=gps_infor_speed[record1-2];
if(record1 > 2)
{
gps_infor_speed[1]=gps_infor_speed[record1-3];
}
else
{
gps_infor_speed[1]=0x30;
}
if(record1 > 3)
{
gps_infor_speed[0]=gps_infor_speed[record1-4];
}
else
{
gps_infor_speed[0]=0x30;
}
}
}
if(devide_flag == 8)
{
if(dir_end == 0x00)
{
if((record1 > 0) && (uart1_r_buf != '.'))
{
gps_infor_dir[record1-1]=uart1_r_buf; //存储方向
}
else if(uart1_r_buf == '.')
{
record1--;
dir_end=0xff;
}
}
else if(dir_end == 0xff)
{
dir_end=0xfe;
if(record1 == 2)
{
gps_infor_dir[2]=gps_infor_dir[record1-2];
gps_infor_dir[1]=0x30;
gps_infor_dir[0]=0x30;
}
if(record1 == 3)
{
gps_infor_dir[2]=gps_infor_dir[record1-2];
gps_infor_dir[1]=gps_infor_dir[record1-3];
gps_infor_dir[0]=0x30;
}
}
}
if(devide_flag == 9)
{
if((record1 > 0) && (record1 < 7))
{
gps_infor_date[record1-1]=uart1_r_buf;
}
}
if(uart1_r_buf == 0x0d)
{
recv1_step=STAGE_SOHE; //接收完成 并信号确定
record1=0; //恢复初始化状态 为下一次准备
devide_flag=0;
sysmode_GPS=TRUE; //置位 GPS 信号为正确
}
}
break;
}
}
if(TI) //如果是发送标志位，清零
TI=0;
}