int main()
{
char * AT = "AT\r\n";//Setting up a char variable AT for the a long string
char response[20]; //A character buffer called response that can hold 20 characters
int result = 0; //int result to check the value of the response sent back
int transmit_send = 0;
volatile int CurrentTick; //Volitile interger to hold the current tick count of the current time
char * ptr; //Character
char * stat;
enum STATES {INIT};
enum STATES CurrentState = INIT;
buffer_init();
hardware_init();
enable_UART0_receive_interrupt();
PIT_Configure_interrupt_mode(1);
while(1)
{
switch(CurrentState)
{
case INIT: //Check connection to MODEM by sending AT. Expected response is OK
result = send_command(AT, response, sizeof(response), 2000);
if(result == SUCCESS || result == ERROR)
{
printf_response(response);
}
if(result == SUCCESS) //"OK" was returned by MODEM
PRINTF("It Worked");
else //incorrect response or timeout. Delay and try again
{
CurrentTick = tick_count;
while((tick_count - CurrentTick) < 5)
{}
}
break;
default:
break;
}//end switch-case
}
}
int main (){
int x;
//char * ptr;
char * AT = "\r\nAT\r\n";
char * PIN_CHECK = "\r\nAT+CPIN?\r\n";
char * ENTER_PIN = "\r\nAT+CPIN=\"1234\"\r\n";
char * CREG = "\r\nAT+CREG?\r\n";
char response[20];
char * ptr;
enum STATES {INIT, CHECK_PIN, SEND_PIN, CHECK_NETWORK_REG, SEND_SMS, CONNECTED};
enum STATES CurrentState = INIT;
hardware_init();
enable_UART0_receive_interrupt();
buffer_init();
PIT_Configure_interrupt_mode(1); //PIT interrupt every second
enable_UART0_receive_interrupt();
PRINTF("\nGSM Modem Control\n");
//Configuration
while(1)
{
switch(CurrentState)
{
case INIT: //Check connection to MODEM by sending AT. Expected response is OK
PRINTF("Testing Modem Connection\n");
result = send_command(AT, response, sizeof(response), 10);
if(result == SUCCESS || result == ERROR)
{
printf_response(response);
}
if(result == SUCCESS) //"OK" was returned by MODEM
CurrentState = CHECK_PIN;
else //incorrect response or timeout. Delay and try again
{
CurrentTick = tick_count;
while((tick_count - CurrentTick) < 5)
{}
}
break;
case CHECK_PIN: //Check if SIM card is ready
result = send_command(PIN_CHECK, response, sizeof(response), 10);
if(result == SUCCESS || result == ERROR)
{
printf_response(response);
}
if(result == SUCCESS) //"OK" returned, check response string for "READY" or "SIM_PIN"
{
if(strstr(response, "READY")) //if ready ok is typed into terminal
{
CurrentState = CHECK_NETWORK_REG; //move to check_network_reg
}
else if(strstr(response, "SIM_PIN")) // sim_pin ok entered
{
CurrentState = SEND_PIN; //move to send_pin
}
}
else
CurrentState = INIT;
break;
case SEND_PIN: //Send PIN code. "OK" response if PIN is correct
result = send_command(ENTER_PIN, response, sizeof(response), 10);
if(result == SUCCESS || result == ERROR)
{
printf_response(response);
}
if(result==SUCCESS) //if logic '0'
{
//if(strstr(response, ""))
CurrentState = CHECK_NETWORK_REG; //move to check_network_reg
}
else
{
CurrentState = CHECK_PIN; //if '-1' move back to check_pin again
}
break;
case CHECK_NETWORK_REG: //check if registered on mobile network
result = send_command(CREG, response, sizeof(response), 20);
if(result == SUCCESS || result == ERROR)
{
printf_response(response);
}
if(result==SUCCESS)
{
if(strstr(response,"+CREG")) //if +creg entered
{
ptr = (char*)strchr(response,':');//point to the colon
ptr+=4; //move 4 places
switch(*ptr)//switch contents of address pointed to
{
case '1'://if +creg: 0,1 entered
CurrentState = INIT;// move back to init
PRINTF("Invalid;Try again");
break;
case '2'://if +creg: 0,2 entered
CurrentState = SEND_SMS;//move to send_sms
PRINTF("Proceed to send SMS");
break;
case '3'://if +creg: 0,3 entered
CurrentTick = tick_count;//wait for "network"
while((tick_count - CurrentTick) < 5)
{}
PRINTF("Checking for Network, Please Wait");
break;
case '4'://if +creg: 0,4 entered
CurrentState = INIT;//move back to init
PRINTF("Invalid,Try Again");
break;
case '5': //if +creg: 0,5 entered
CurrentState = SEND_SMS;//send sms
PRINTF("Proceed to send SMS");
break;
default:
CurrentState = INIT;
PRINTF("Invalid,Try Again");
break;
}
}
else
{
CurrentState = INIT;
}
printf_response(response);
break;
case SEND_SMS: //Send a text message
send_sms("\"0871234567\"","\"Testing 123\""); //send number
send_sms("\"0171112233\"","\"Success\""); // the message
if(result==SUCCESS) // if logic '0'
{
PRINTF("Message has been sent");
CurrentState = CONNECTED;//move to connected
break;
}
else
{
CurrentTick = tick_count;// wait for input
while((tick_count - CurrentTick) < 5)
{}
break;
}
case CONNECTED:
while(1) //dummy loop
{}
break;
default:
break;
}//end switch-case
}//end while(1)
}
}