// this is a test about GPRS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h> // open() close()
#include <unistd.h> // read() write()
#include <termios.h> // set baud rate
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#define FUNC_RUN 0
#define FUNC_NOT_RUN 1
#define SIMPLE_TEST 1
#define READ_SIM_CARD_ID 2
#define MAKE_A_CALL 3
#define WAIT_A_CALL 4
#define SHORT_MESSAGE 5
#define FUNC_QUIT 6
#define SEND_SHORT_MESSAGE 1
#define READ_SHORT_MESSAGE 2
#define CONFIG_SHORT_MESSAGE_ENV 3
#define QUIT_SHORT_MESSAGE 4
#define DEVICE_TTYS "/dev/ttyS1"
#define MAX_LEN_OF_SHORT_MESSAGE 140
#define RECEIVE_BUF_WAIT_1S 1
#define RECEIVE_BUF_WAIT_2S 2
#define RECEIVE_BUF_WAIT_3S 3
#define RECEIVE_BUF_WAIT_4S 4
#define RECEIVE_BUF_WAIT_5S 5
//------------------------------------- read datas from GSM/GPRS --------------------------------------------
// succese return 1
// error return 0
int read_GSM_GPRS_datas(int fd, char *rcv_buf,int rcv_wait)
{
int retval;
fd_set rfds;
struct timeval tv;
int ret,pos;
tv.tv_sec = rcv_wait; // wait 2.5s
tv.tv_usec = 0;
pos = 0; // point to rceeive buf
while (1)
{
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
retval = select(fd+1 , &rfds, NULL, NULL, &tv);
if (retval == -1)
{
perror("select()");
break;
}
else if (retval)
{// pan duan shi fou hai you shu ju
ret = read(fd, rcv_buf+pos, 2048);
pos += ret;
if (rcv_buf[pos-2] == '\r' && rcv_buf[pos-1] == '\n')
{
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
retval = select(fd+1 , &rfds, NULL, NULL, &tv);
if (!retval) break;// no datas, break
}
}
else
{
printf("No data\n");
break;
}
}
return 1;
} // end read_GSM_GPRS_datas
//------------------------------------- send cmd ------------------------------------------------------------
// succese return 1
// error return 0
int send_GSM_GPRS_cmd(int fd, char *send_buf)
{
ssize_t ret;
ret = write(fd,send_buf,strlen(send_buf));
if (ret == -1)
{
printf ("write device %s error\n", DEVICE_TTYS);
return -1;
}
return 1;
} // end send_GSM_GPRS_cmd
//------------------------------------- send cmd and read back result ---------------------------------------
void GSM_GPRS_send_cmd_read_result(int fd, char *send_buf, int rcv_wait)
{
char rcv_buf[2048];
if((send_buf==NULL) || (send_GSM_GPRS_cmd(fd,send_buf)))
{ // send success , then read
bzero(rcv_buf,sizeof(rcv_buf));
if (read_GSM_GPRS_datas(fd,rcv_buf,rcv_wait))
{
printf ("%s\n",rcv_buf);
}
else
{
printf ("read error\n");
}
}
else
{
printf("write error\n");
}
} // end GSM_GPRS_send_cmd_read_result
//------------------------------------- send cmd : "at" to GSM/GPRS MODEM -----------------------------------
void GSM_simple_test(int fd)
{
char *send_buf="at\r";
GSM_GPRS_send_cmd_read_result(fd,send_buf,RECEIVE_BUF_WAIT_1S);
} // end GSM_simple_test
//------------------------------------- send cmd : "at+ccid" to GSM/GPRS MODEM ------------------------------
void GSM_read_sim_card_id(int fd)
{
char *send_buf="at+ccid\r";
GSM_GPRS_send_cmd_read_result(fd,send_buf,RECEIVE_BUF_WAIT_1S);
} // end GSM_read_sim_card_id
//------------------------------------- print ---------------------------------------------------------------
void print_prompt(void)
{
printf ("Select what you want to do:\n");
printf ("1 : Simple Test\n");
printf ("2 : Read SIM CARD ID\n");
printf ("3 : Make A Call\n");
printf ("4 : Wait A Call\n");
printf ("5 : Short message\n");
printf ("6 : Quit\n");
printf (">");
} // end print_prompt
//------------------------------------- Control GSM/GPRS MODULE ---------------------------------------------
void func_GSM(int fd)
{
int flag_func_run;
int flag_select_func;
ssize_t ret;
flag_func_run = FUNC_RUN;
while (flag_func_run == FUNC_RUN)
{
print_prompt(); // print select functions
scanf("%d",&flag_select_func); // user input select
getchar();
switch(flag_select_func)
{
case SIMPLE_TEST : {GSM_simple_test(fd); break;}
case READ_SIM_CARD_ID : {GSM_read_sim_card_id(fd); break;}
case MAKE_A_CALL : {GSM_call(fd); break;}
case WAIT_A_CALL : {GSM_wait_call(fd); break;}
case SHORT_MESSAGE : {GSM_short_mesg(fd); break;}
case FUNC_QUIT :
{
flag_func_run = FUNC_NOT_RUN;
printf("Quit GSM/GPRS function. byebye\n");
break;
}
default :
{
printf("please input your select use 1 to 7\n");
}
}
}
}// end func_GPRS
//------------------------------------- init seriel port ---------------------------------------------------
void init_ttyS(int fd)
{
struct termios options;
bzero(&options, sizeof(options)); // clear options
cfsetispeed(&options,B9600); // setup baud rate
cfsetospeed(&options,B9600);
options.c_cflag |= (CRTSCTS | CS8 | CLOCAL | CREAD);
options.c_iflag = IGNPAR;
tcflush(fd, TCIFLUSH);
tcsetattr(fd, TCSANOW, &options);
}//end init_ttyS
//------------------------------------- main ----------------------------------------------------------------
int main(void)
{
int fd;
printf("\nGSM/GPRS TESTS\n\n");
// open seriel port
fd = open(DEVICE_TTYS, O_RDWR);
if (fd == -1)
{
printf("open device %s error\n",DEVICE_TTYS);
}
else
{
init_ttyS(fd); // init device
func_GSM(fd); // GSM/GPRS functions
// close ttyS0
if (close(fd)!=0) printf("close device %s error",DEVICE_TTYS);
}
return 0;
}// end main
