大型貨車超載超速實時檢測系統(tǒng)
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4.3 GPRS模塊
ARM將收集到的重量和速度信號經過處理之后，如果貨車超載或者超速就將相關的貨車信息（車牌號，超速超重多少等）傳送到GPRS模塊，通過GPRS傳送到主服務器上，主程序程序流程圖如圖4.9：
/************************************************
* GPRS demo, use ppp to connect internet
* use ttyS1 to ctrol GPRS
* by Zou jian guo [email protected]>
* 2004-11-02
*************************************************/
#include termios.h>
#include stdio.h>
#include unistd.h>
#include fcntl.h>
#include time.h>
//#include sys/signal.h>
#include pthread.h>
#include tty.h
#include gprs.h
/*--------------------------------------------------------*/
#define ENDMINITERM 27 /* ESC to quit miniterm */
#define FALSE 0
#define TRUE 1
/*--------------------------------------------------------*/
volatile int STOP=FALSE;
int GET_GPRS_OK=FALSE;
int baud=B115200;
int get_baudrate(int argc,char** argv);
char * cmd[20]={
at,
ate1,
at+chfa=1, //設置通話通道為1,AT+CHFA 命令切換主副音頻通道
at+clvl=100, //設置受話器音量最大, AT+CLVL 命令可以調節(jié)輸出音頻信號增益
at+cmic=1,10 //設置通道1的話筒增益
// atd12345678r,
};
void * keyshell() ;
/* modem input handler */
void* gprs_show(void * data)
{
while(1)
{
if(GET_GPRS_OK){
GET_GPRS_OK=FALSE;
printf(%s,GPRS_BUF);
GPRS_parse(GPRS_BUF,gps_info);
GPRS_show();
}
usleep(100);
if(STOP)break;
}
}
/* modem input handler */
void* gprs_read(void * data)
{
int i=0;
char c;
char buf[1024];
printf(nread modemn);
while (STOP==FALSE)
{
tty_read(c,1);
printf(%c,c);
}
printf(exit from reading modemn);
return NULL;
}
int main(int argc,char** argv)
{
int ok;
pthread_t th_a, th_b, th_show;
void * retval;
if(argc 2) {
printf ( Default baudrate is 115200 bps. If not, please enter the baudrate as a parametern);
}
else
baud=get_baudrate(argc, argv);
tty_init();
pthread_create(th_a, NULL, keyshell, 0);
pthread_create(th_b, NULL, gprs_read, 0);
pthread_create(th_show, NULL, gprs_show, 0);
while(!STOP){
usleep(100000);
}
tty_end();
exit(0);
}
int get_baudrate(int argc,char** argv)
{
int v=atoi(argv[1]);
switch(v){
case 4800:
return B4800;
case 9600:
return B9600;
case 19200:
return B19200;
case 38400:
return B38400;
case 57600:
return B57600;
case 115200:
return B115200;
default:
return -1;
}
}
void gprs_init()
{
int i;
for(i=0; i5; i++) {
tty_writecmd(cmd[i], strlen(cmd[i]));
}
}
void gprs_hold()
{
tty_writecmd(at, strlen(at));
tty_writecmd(ath, strlen(ath));
}
void gprs_ans()
{
tty_writecmd(at, strlen(at));
tty_writecmd(ata, strlen(ata));
}
void gprs_call(char *number, int num)
{
tty_write(atd, strlen(atd));
tty_write(number, num);
tty_write(;r, strlen(;r));
usleep(200000);
}
void gprs_msg(char *number, int num)
{
char ctl[]={26,0};
char text[]=Welcome to use up-tech embedded platform!;
tty_writecmd(at, strlen(at));
tty_writecmd(at, strlen(at));
tty_writecmd(at+cmgf=1, strlen(at+cmgf=1));
tty_write(at+cmgs=, strlen(at+cmgs=));
tty_write(, strlen());
tty_write(number, strlen(number));
tty_write(, strlen());
tty_write(;r, strlen(;r));
tty_write(text, strlen(text));
tty_write(ctl, 1);
usleep(300000);
}
void gprs_baud(char *baud,int num)
{
tty_write(at+ipr=, strlen(at+ipr=));
tty_writecmd(baud, strlen(baud) );
usleep(200000);
}
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