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GSM_Shield.cpp
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/*
GSM.cpp - library for the GSM Playground - GSM Shield for Arduino
Released under the Creative Commons Attribution-Share Alike 3.0 License
http://www.creativecommons.org/licenses/by-sa/3.0/
www.hwkitchen.com
*/
#include "WProgram.h"
#include "NewSoftSerial.h"
#include "GSM_Shield.h"
extern "C" {
#include <string.h>
}
NewSoftSerial mySerial(4, 5); //rx, tx
#ifdef DEBUG_LED_ENABLED
int DEBUG_LED = 25; // LED connected to digital pin 25
void GSM::BlinkDebugLED (byte num_of_blink)
{
byte i;
pinMode(DEBUG_LED, OUTPUT); // sets the digital pin as output
for (i = 0; i < num_of_blink; i++) {
digitalWrite(DEBUG_LED, HIGH); // sets the LED on
delay(50);
digitalWrite(DEBUG_LED, LOW); // sets the LED off
delay(500);
}
}
#endif
#ifdef DEBUG_PRINT
/**********************************************************
Two methods print out debug information to the standard output
- it means to the serial line.
First method prints string.
Second method prints integer numbers.
Note:
=====
The serial line is connected to the GSM module and is
used for sending AT commands. There is used "trick" that GSM
module accepts not valid AT command strings because it doesn't
understand them and still waits for some valid AT command.
So after all debug strings are sent we send just AT<CR> as
a valid AT command and GSM module responds by OK. So previous
debug strings are overwritten and GSM module is not influenced
by these debug texts
string_to_print: pointer to the string to be print out
last_debug_print: 0 - this is not last debug info, we will
continue with sending... so don't send
AT<CR>(see explanation above)
1 - we are finished with sending debug info
for this time and finished AT<CR>
will be sent(see explanation above)
**********************************************************/
void GSM::DebugPrint(const char *string_to_print, byte last_debug_print)
{
if (last_debug_print) {
Serial.println(string_to_print);
SendATCmdWaitResp("AT", 500, 50, "OK", 1);
}
else Serial.print(string_to_print);
}
void GSM::DebugPrint(int number_to_print, byte last_debug_print)
{
Serial.println(number_to_print);
if (last_debug_print) {
SendATCmdWaitResp("AT", 500, 50, "OK", 1);
}
}
#endif
/**********************************************************
Method returns GSM library version
return val: 100 means library version 1.00
101 means library version 1.01
**********************************************************/
int GSM::LibVer(void)
{
return (GSM_LIB_VERSION);
}
/**********************************************************
Constructor definition
***********************************************************/
GSM::GSM(void)
{
// set some GSM pins as inputs, some as outputs
pinMode(GSM_ON, OUTPUT); // sets pin 5 as output
pinMode(GSM_RESET, OUTPUT); // sets pin 4 as output
//pinMode(DTMF_OUTPUT_ENABLE, OUTPUT); // sets pin 2 as output
// deactivation of IC8 so DTMF is disabled by default
//digitalWrite(DTMF_OUTPUT_ENABLE, LOW);
// not registered yet
module_status = STATUS_NONE;
// initialization of speaker volume
last_speaker_volume = 0;
}
/**********************************************************
Initialization of GSM module serial line
**********************************************************/
/*
void GSM::InitSerLine(long baud_rate)
{
// open the Serial line for the communication
mySerial.begin(baud_rate);
//SendATCmdWaitResp("AT+IPR=9600", 500, 50, "OK", 5);
for (int i=1;i<7;i++){
switch (i) {
case 1:
mySerial.begin(4800);
break;
case 2:
mySerial.begin(9600);
break;
case 3:
mySerial.begin(19200);
break;
case 4:
mySerial.begin(38400);
break;
case 5:
mySerial.begin(57600);
break;
case 6:
mySerial.begin(115200);
break;
// if nothing else matches, do the default
// default is optional
}
mySerial.print("AT+IPR=");
mySerial.print(baud_rate);
mySerial.print("\r"); // send <CR>
}
// communication line is not used yet = free
SetCommLineStatus(CLS_FREE);
// pointer is initialized to the first item of comm. buffer
p_comm_buf = &comm_buf[0];
}
*/
/**********************************************************
Initializes receiving process
start_comm_tmout - maximum waiting time for receiving the first response
character (in msec.)
max_interchar_tmout - maximum tmout between incoming characters
in msec.
if there is no other incoming character longer then specified
tmout(in msec) receiving process is considered as finished
**********************************************************/
void GSM::RxInit(uint16_t start_comm_tmout, uint16_t max_interchar_tmout)
{
rx_state = RX_NOT_STARTED;
start_reception_tmout = start_comm_tmout;
interchar_tmout = max_interchar_tmout;
prev_time = millis();
comm_buf[0] = 0x00; // end of string
p_comm_buf = &comm_buf[0];
comm_buf_len = 0;
mySerial.flush(); // erase rx circular buffer
}
/**********************************************************
Method checks if receiving process is finished or not.
Rx process is finished if defined inter-character tmout is reached
returns:
RX_NOT_FINISHED = 0,// not finished yet
RX_FINISHED, // finished - inter-character tmout occurred
RX_TMOUT_ERR, // initial communication tmout occurred
**********************************************************/
byte GSM::IsRxFinished(void)
{
byte num_of_bytes;
byte ret_val = RX_NOT_FINISHED; // default not finished
// Rx state machine
// ----------------
if (rx_state == RX_NOT_STARTED) {
// Reception is not started yet - check tmout
if (!mySerial.available()) {
// still no character received => check timeout
/*
#ifdef DEBUG_GSMRX
DebugPrint("\r\nDEBUG: reception timeout", 0);
Serial.print((unsigned long)(millis() - prev_time));
DebugPrint("\r\nDEBUG: start_reception_tmout\r\n", 0);
Serial.print(start_reception_tmout);
#endif
*/
if ((unsigned long)(millis() - prev_time) >= start_reception_tmout) {
// timeout elapsed => GSM module didn't start with response
// so communication is takes as finished
/*
#ifdef DEBUG_GSMRX
DebugPrint("\r\nDEBUG: RECEPTION TIMEOUT", 0);
#endif
*/
comm_buf[comm_buf_len] = 0x00;
ret_val = RX_TMOUT_ERR;
}
}
else {
// at least one character received => so init inter-character
// counting process again and go to the next state
prev_time = millis(); // init tmout for inter-character space
rx_state = RX_ALREADY_STARTED;
}
}
if (rx_state == RX_ALREADY_STARTED) {
// Reception already started
// check new received bytes
// only in case we have place in the buffer
num_of_bytes = mySerial.available();
// if there are some received bytes postpone the timeout
if (num_of_bytes) prev_time = millis();
// read all received bytes
while (num_of_bytes) {
num_of_bytes--;
if (comm_buf_len < COMM_BUF_LEN) {
// we have still place in the GSM internal comm. buffer =>
// move available bytes from circular buffer
// to the rx buffer
*p_comm_buf = mySerial.read();
p_comm_buf++;
comm_buf_len++;
comm_buf[comm_buf_len] = 0x00; // and finish currently received characters
// so after each character we have
// valid string finished by the 0x00
}
else {
// comm buffer is full, other incoming characters
// will be discarded
// but despite of we have no place for other characters
// we still must to wait until
// inter-character tmout is reached
// so just readout character from circular RS232 buffer
// to find out when communication id finished(no more characters
// are received in inter-char timeout)
mySerial.read();
}
}
// finally check the inter-character timeout
/*
#ifdef DEBUG_GSMRX
DebugPrint("\r\nDEBUG: intercharacter", 0);
Serial.print((unsigned long)(millis() - prev_time));
DebugPrint("\r\nDEBUG: interchar_tmout\r\n", 0);
Serial.print(interchar_tmout);
#endif
*/
if ((unsigned long)(millis() - prev_time) >= interchar_tmout) {
// timeout between received character was reached
// reception is finished
// ---------------------------------------------
/*
#ifdef DEBUG_GSMRX
DebugPrint("\r\nDEBUG: OVER INTER TIMEOUT", 0);
#endif
*/
comm_buf[comm_buf_len] = 0x00; // for sure finish string again
// but it is not necessary
ret_val = RX_FINISHED;
}
}
#ifdef DEBUG_GSMRX
if (ret_val == RX_FINISHED){
DebugPrint("DEBUG: Received string\r\n", 0);
for (int i=0; i<comm_buf_len; i++){
Serial.print(byte(comm_buf[i]));
}
}
#endif
return (ret_val);
}
/**********************************************************
Method checks received bytes
compare_string - pointer to the string which should be find
return: 0 - string was NOT received
1 - string was received
**********************************************************/
byte GSM::IsStringReceived(char const *compare_string)
{
char *ch;
byte ret_val = 0;
if(comm_buf_len) {
/*
#ifdef DEBUG_GSMRX
DebugPrint("DEBUG: Compare the string: \r\n", 0);
for (int i=0; i<comm_buf_len; i++){
Serial.print(byte(comm_buf[i]));
}
DebugPrint("\r\nDEBUG: with the string: \r\n", 0);
Serial.print(compare_string);
DebugPrint("\r\n", 0);
#endif
*/
ch = strstr((char *)comm_buf, compare_string);
if (ch != NULL) {
ret_val = 1;
/*#ifdef DEBUG_PRINT
DebugPrint("\r\nDEBUG: expected string was received\r\n", 0);
#endif
*/
}
else
{
/*#ifdef DEBUG_PRINT
DebugPrint("\r\nDEBUG: expected string was NOT received\r\n", 0);
#endif
*/
}
}
return (ret_val);
}
/**********************************************************
Method waits for response
start_comm_tmout - maximum waiting time for receiving the first response
character (in msec.)
max_interchar_tmout - maximum tmout between incoming characters
in msec.
return:
RX_FINISHED finished, some character was received
RX_TMOUT_ERR finished, no character received
initial communication tmout occurred
**********************************************************/
byte GSM::WaitResp(uint16_t start_comm_tmout, uint16_t max_interchar_tmout)
{
byte status;
RxInit(start_comm_tmout, max_interchar_tmout);
// wait until response is not finished
do {
status = IsRxFinished();
} while (status == RX_NOT_FINISHED);
return (status);
}
/**********************************************************
Method waits for response with specific response string
start_comm_tmout - maximum waiting time for receiving the first response
character (in msec.)
max_interchar_tmout - maximum tmout between incoming characters
in msec.
expected_resp_string - expected string
return:
RX_FINISHED_STR_RECV, finished and expected string received
RX_FINISHED_STR_NOT_RECV finished, but expected string not received
RX_TMOUT_ERR finished, no character received
initial communication tmout occurred
**********************************************************/
byte GSM::WaitResp(uint16_t start_comm_tmout, uint16_t max_interchar_tmout,
char const *expected_resp_string)
{
byte status;
byte ret_val;
RxInit(start_comm_tmout, max_interchar_tmout);
// wait until response is not finished
do {
status = IsRxFinished();
} while (status == RX_NOT_FINISHED);
if (status == RX_FINISHED) {
// something was received but what was received?
// ---------------------------------------------
if(IsStringReceived(expected_resp_string)) {
// expected string was received
// ----------------------------
ret_val = RX_FINISHED_STR_RECV;
}
else ret_val = RX_FINISHED_STR_NOT_RECV;
}
else {
// nothing was received
// --------------------
ret_val = RX_TMOUT_ERR;
}
return (ret_val);
}
/**********************************************************
Method sends AT command and waits for response
return:
AT_RESP_ERR_NO_RESP = -1, // no response received
AT_RESP_ERR_DIF_RESP = 0, // response_string is different from the response
AT_RESP_OK = 1, // response_string was included in the response
**********************************************************/
char GSM::SendATCmdWaitResp(char const *AT_cmd_string,
uint16_t start_comm_tmout, uint16_t max_interchar_tmout,
char const *response_string,
byte no_of_attempts)
{
byte status;
char ret_val = AT_RESP_ERR_NO_RESP;
byte i;
for (i = 0; i < no_of_attempts; i++) {
// delay 500 msec. before sending next repeated AT command
// so if we have no_of_attempts=1 tmout will not occurred
if (i > 0) delay(500);
mySerial.println(AT_cmd_string);
status = WaitResp(start_comm_tmout, max_interchar_tmout);
if (status == RX_FINISHED) {
// something was received but what was received?
// ---------------------------------------------
if(IsStringReceived(response_string)) {
ret_val = AT_RESP_OK;
break; // response is OK => finish
}
else ret_val = AT_RESP_ERR_DIF_RESP;
}
else {
// nothing was received
// --------------------
ret_val = AT_RESP_ERR_NO_RESP;
}
}
return (ret_val);
}
/**********************************************************
Methods return the state of corresponding
bits in the status variable
- these methods do not communicate with the GSM module
return values:
0 - not true (not active)
>0 - true (active)
**********************************************************/
byte GSM::IsRegistered(void)
{
return (module_status & STATUS_REGISTERED);
}
byte GSM::IsInitialized(void)
{
return (module_status & STATUS_INITIALIZED);
}
/**********************************************************
Checks if the GSM module is responding
to the AT command
- if YES nothing is made
- if NO GSM module is turned on
**********************************************************/
void GSM::TurnOn(long baud_rate)
{
SetCommLineStatus(CLS_ATCMD);
mySerial.begin(baud_rate);
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: baud ", 0);
DebugPrint(baud_rate, 0);
#endif
if (AT_RESP_ERR_NO_RESP == SendATCmdWaitResp("AT", 500, 100, "OK", 5)) { //check power
// there is no response => turn on the module
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: GSM module is off\r\n", 0);
DebugPrint("DEBUG: start the module\r\n", 0);
#endif
// generate turn on pulse
digitalWrite(GSM_ON, HIGH);
delay(1200);
digitalWrite(GSM_ON, LOW);
delay(5000);
}
else
{
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: GSM module is on\r\n", 0);
#endif
}
if (AT_RESP_ERR_DIF_RESP == SendATCmdWaitResp("AT", 500, 100, "OK", 5)) { //check OK
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: the baud is not ok\r\n", 0);
#endif
//SendATCmdWaitResp("AT+IPR=9600", 500, 50, "OK", 5);
for (int i=1;i<7;i++){
switch (i) {
case 1:
mySerial.begin(4800);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 4800\r\n", 0);
#endif
break;
case 2:
mySerial.begin(9600);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 9600\r\n", 0);
#endif
break;
case 3:
mySerial.begin(19200);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 19200\r\n", 0);
#endif
break;
case 4:
mySerial.begin(38400);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 38400\r\n", 0);
#endif
break;
case 5:
mySerial.begin(57600);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 57600\r\n", 0);
#endif
break;
case 6:
mySerial.begin(115200);
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: provo Baud 115200\r\n", 0);
#endif
break;
// if nothing else matches, do the default
// default is optional
}
/*
p_char = strchr((char *)(comm_buf),',');
p_char1 = p_char+2; // we are on the first phone number character
p_char = strchr((char *)(p_char1),'"');
if (p_char != NULL) {
*p_char = 0; // end of string
strcpy(phone_number, (char *)(p_char1));
}
*/
delay(100);
/*sprintf (buff,"AT+IPR=%f",baud_rate);
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: Stringa ", 0);
DebugPrint(buff, 0);
#endif
*/
mySerial.print("AT+IPR=");
mySerial.print(baud_rate);
mySerial.print("\r"); // send <CR>
delay(500);
mySerial.begin(baud_rate);
delay(100);
if (AT_RESP_OK == SendATCmdWaitResp("AT", 500, 100, "OK", 5)){
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: ricevuto ok da modulo, baud impostato: ", 0);
DebugPrint(baud_rate, 0);
#endif
break;
}
}
// communication line is not used yet = free
SetCommLineStatus(CLS_FREE);
// pointer is initialized to the first item of comm. buffer
p_comm_buf = &comm_buf[0];
if (AT_RESP_ERR_NO_RESP == SendATCmdWaitResp("AT", 500, 50, "OK", 5)) {
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: No answer from the module\r\n", 0);
#endif
}
else{
#ifdef DEBUG_PRINT
// parameter 0 - because module is off so it is not necessary
// to send finish AT<CR> here
DebugPrint("DEBUG: 1 baud ok\r\n", 0);
#endif
}
}
else
{
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: 2 GSM module is on and baud is ok\r\n", 0);
#endif
}
SetCommLineStatus(CLS_FREE);
// send collection of first initialization parameters for the GSM module
InitParam(PARAM_SET_0);
}
/**********************************************************
Sends parameters for initialization of GSM module
group: 0 - parameters of group 0 - not necessary to be registered in the GSM
1 - parameters of group 1 - it is necessary to be registered
**********************************************************/
void GSM::InitParam(byte group)
{
switch (group) {
case PARAM_SET_0:
// check comm line
if (CLS_FREE != GetCommLineStatus()) return;
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: configure the module PARAM_SET_0\r\n", 0);
#endif
SetCommLineStatus(CLS_ATCMD);
// Reset to the factory settings
SendATCmdWaitResp("AT&F", 1000, 50, "OK", 5);
// switch off echo
//SendATCmdWaitResp("ATE0", 500, 50, "OK", 5);
// setup fixed baud rate
//SendATCmdWaitResp("AT+IPR=9600", 500, 50, "OK", 5);
// setup mode
//SendATCmdWaitResp("AT#SELINT=1", 500, 50, "OK", 5);
// Switch ON User LED - just as signalization we are here
//SendATCmdWaitResp("AT#GPIO=8,1,1", 500, 50, "OK", 5);
// Sets GPIO9 as an input = user button
//SendATCmdWaitResp("AT#GPIO=9,0,0", 500, 50, "OK", 5);
// allow audio amplifier control
//SendATCmdWaitResp("AT#GPIO=5,0,2", 500, 50, "OK", 5);
// Switch OFF User LED- just as signalization we are finished
//SendATCmdWaitResp("AT#GPIO=8,0,1", 500, 50, "OK", 5);
SetCommLineStatus(CLS_FREE);
break;
case PARAM_SET_1:
// check comm line
if (CLS_FREE != GetCommLineStatus()) return;
#ifdef DEBUG_PRINT
DebugPrint("DEBUG: configure the module PARAM_SET_1\r\n", 0);
#endif
SetCommLineStatus(CLS_ATCMD);
// Request calling line identification
SendATCmdWaitResp("AT+CLIP=1", 500, 50, "OK", 5);
// Mobile Equipment Error Code
SendATCmdWaitResp("AT+CMEE=0", 500, 50, "OK", 5);
// Echo canceller enabled
//SendATCmdWaitResp("AT#SHFEC=1", 500, 50, "OK", 5);
// Ringer tone select (0 to 32)
//SendATCmdWaitResp("AT#SRS=26,0", 500, 50, "OK", 5);
// Microphone gain (0 to 7) - response here sometimes takes
// more than 500msec. so 1000msec. is more safety
//SendATCmdWaitResp("AT#HFMICG=7", 1000, 50, "OK", 5);
// set the SMS mode to text
SendATCmdWaitResp("AT+CMGF=1", 500, 50, "OK", 5);
// Auto answer after first ring enabled
// auto answer is not used
//SendATCmdWaitResp("ATS0=1", 500, 50, "OK", 5);
// select ringer path to handsfree
//SendATCmdWaitResp("AT#SRP=1", 500, 50, "OK", 5);
// select ringer sound level
//SendATCmdWaitResp("AT+CRSL=2", 500, 50, "OK", 5);
// we must release comm line because SetSpeakerVolume()
// checks comm line if it is free
SetCommLineStatus(CLS_FREE);
// select speaker volume (0 to 14)
//SetSpeakerVolume(9);
// init SMS storage
InitSMSMemory();
// select phonebook memory storage
SendATCmdWaitResp("AT+CPBS=\"SM\"", 1000, 50, "OK", 5);
break;
}
}
/**********************************************************
Enables DTMF receiver = IC8 device
**********************************************************/
/*void GSM::EnableDTMF(void)
{
// configuration of corresponding DTMF pins
pinMode(DTMF_DATA_VALID, INPUT); // sets pin 3 as input
pinMode(DTMF_DATA0, INPUT); // sets pin 6 as input
pinMode(DTMF_DATA1, INPUT); // sets pin 7 as input
pinMode(DTMF_DATA2, INPUT); // sets pin 8 as input
pinMode(DTMF_DATA3, INPUT); // sets pin 9 as input
// activation of IC8
digitalWrite(DTMF_OUTPUT_ENABLE, HIGH);
}
*/
/**********************************************************
Checks if DTMF signal is valid
return: >= 0x10hex(16dec) - DTMF signal is NOT valid
0..15 - valid DTMF signal
**********************************************************/
/*byte GSM::GetDTMFSignal(void)
{
static byte last_state = LOW; // initialization
byte ret_val = 0xff; // default - not valid
if (digitalRead(DTMF_DATA_VALID)==HIGH
&& last_state == LOW) {
// valid DTMF signal => decode it
// ------------------------------
last_state = HIGH; // remember last state
ret_val = 0;
if (digitalRead(DTMF_DATA0)) ret_val |= 0x01;
if (digitalRead(DTMF_DATA1)) ret_val |= 0x02;
if (digitalRead(DTMF_DATA2)) ret_val |= 0x04;
if (digitalRead(DTMF_DATA3)) ret_val |= 0x08;
// confirm DTMF signal by the tone 5
// ---------------------------------
SendDTMFSignal(5);
}
else if (digitalRead(DTMF_DATA_VALID) == LOW) {
// pulse is not valid => enable to check DTMF signal again
// -------------------------------------------------------
last_state = LOW;
}
return (ret_val);
}
*/
/**********************************************************
Turns on/off the speaker
off_on: 0 - off
1 - on
**********************************************************/
void GSM::SetSpeaker(byte off_on)
{
if (CLS_FREE != GetCommLineStatus()) return;
SetCommLineStatus(CLS_ATCMD);
if (off_on) {
//SendATCmdWaitResp("AT#GPIO=5,1,2", 500, 50, "#GPIO:", 1);
}
else {
//SendATCmdWaitResp("AT#GPIO=5,0,2", 500, 50, "#GPIO:", 1);
}
SetCommLineStatus(CLS_FREE);
}
/**********************************************************
Method checks if the GSM module is registered in the GSM net
- this method communicates directly with the GSM module
in contrast to the method IsRegistered() which reads the
flag from the module_status (this flag is set inside this method)
- must be called regularly - from 1sec. to cca. 10 sec.
return values:
REG_NOT_REGISTERED - not registered
REG_REGISTERED - GSM module is registered
REG_NO_RESPONSE - GSM doesn't response
REG_COMM_LINE_BUSY - comm line between GSM module and Arduino is not free
for communication
**********************************************************/
byte GSM::CheckRegistration(void)
{
byte status;
byte ret_val = REG_NOT_REGISTERED;
if (CLS_FREE != GetCommLineStatus()) return (REG_COMM_LINE_BUSY);
SetCommLineStatus(CLS_ATCMD);
mySerial.println("AT+CREG?");
// 5 sec. for initial comm tmout
// 50 msec. for inter character timeout
status = WaitResp(5000, 50);
if (status == RX_FINISHED) {
// something was received but what was received?
// ---------------------------------------------
if(IsStringReceived("+CREG: 0,1")
|| IsStringReceived("+CREG: 0,5")) {
// it means module is registered
// ----------------------------
module_status |= STATUS_REGISTERED;
// in case GSM module is registered first time after reset
// sets flag STATUS_INITIALIZED
// it is used for sending some init commands which
// must be sent only after registration
// --------------------------------------------
if (!IsInitialized()) {
module_status |= STATUS_INITIALIZED;
SetCommLineStatus(CLS_FREE);
InitParam(PARAM_SET_1);
}
ret_val = REG_REGISTERED;
}
else {
// NOT registered
// --------------
module_status &= ~STATUS_REGISTERED;
ret_val = REG_NOT_REGISTERED;
}
}
else {
// nothing was received
// --------------------
ret_val = REG_NO_RESPONSE;
}
SetCommLineStatus(CLS_FREE);
return (ret_val);
}
/**********************************************************
Method checks status of call
return:
CALL_NONE - no call activity
CALL_INCOM_VOICE - incoming voice
CALL_ACTIVE_VOICE - active voice
CALL_NO_RESPONSE - no response to the AT command
CALL_COMM_LINE_BUSY - comm line is not free
**********************************************************/
byte GSM::CallStatus(void)
{
byte ret_val = CALL_NONE;
if (CLS_FREE != GetCommLineStatus()) return (CALL_COMM_LINE_BUSY);
SetCommLineStatus(CLS_ATCMD);
mySerial.println("AT+CPAS");
// 5 sec. for initial comm tmout
// 50 msec. for inter character timeout
if (RX_TMOUT_ERR == WaitResp(5000, 50)) {
// nothing was received (RX_TMOUT_ERR)
// -----------------------------------
ret_val = CALL_NO_RESPONSE;
}
else {
// something was received but what was received?
// ---------------------------------------------
// ready (device allows commands from TA/TE)
// <CR><LF>+CPAS: 0<CR><LF> <CR><LF>OK<CR><LF>
// unavailable (device does not allow commands from TA/TE)
// <CR><LF>+CPAS: 1<CR><LF> <CR><LF>OK<CR><LF>
// unknown (device is not guaranteed to respond to instructions)
// <CR><LF>+CPAS: 2<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
// ringing
// <CR><LF>+CPAS: 3<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
// call in progress
// <CR><LF>+CPAS: 4<CR><LF> <CR><LF>OK<CR><LF> - NO CALL
if(IsStringReceived("0")) {
// ready - there is no call
// ------------------------
ret_val = CALL_NONE;
}
else if(IsStringReceived("3")) {
// incoming call
// --------------
ret_val = CALL_INCOM_VOICE;
}
else if(IsStringReceived("4")) {
// active call
// -----------
ret_val = CALL_ACTIVE_VOICE;
}
}
SetCommLineStatus(CLS_FREE);
return (ret_val);
}
/**********************************************************
Method checks status of call(incoming or active)
and makes authorization with specified SIM positions range
phone_number: a pointer where the tel. number string of current call will be placed
so the space for the phone number string must be reserved - see example
first_authorized_pos: initial SIM phonebook position where the authorization process
starts
last_authorized_pos: last SIM phonebook position where the authorization process
finishes
Note(important):
================
In case first_authorized_pos=0 and also last_authorized_pos=0
the received incoming phone number is NOT authorized at all, so every
incoming is considered as authorized (CALL_INCOM_VOICE_NOT_AUTH is returned)
return:
CALL_NONE - no call activity
CALL_INCOM_VOICE_AUTH - incoming voice - authorized
CALL_INCOM_VOICE_NOT_AUTH - incoming voice - not authorized
CALL_ACTIVE_VOICE - active voice
CALL_INCOM_DATA_AUTH - incoming data call - authorized
CALL_INCOM_DATA_NOT_AUTH - incoming data call - not authorized
CALL_ACTIVE_DATA - active data call
CALL_NO_RESPONSE - no response to the AT command
CALL_COMM_LINE_BUSY - comm line is not free
**********************************************************/
byte GSM::CallStatusWithAuth(char *phone_number,
byte first_authorized_pos, byte last_authorized_pos)
{
byte ret_val = CALL_NONE;
byte search_phone_num = 0;
byte i;
byte status;
char *p_char;
char *p_char1;
phone_number[0] = 0x00; // no phonr number so far
if (CLS_FREE != GetCommLineStatus()) return (CALL_COMM_LINE_BUSY);
SetCommLineStatus(CLS_ATCMD);
mySerial.println("AT+CLCC");
// 5 sec. for initial comm tmout
// and max. 1500 msec. for inter character timeout
RxInit(5000, 1500);
// wait response is finished
do {
if (IsStringReceived("OK\r\n")) {
// perfect - we have some response, but what:
// there is either NO call:
// <CR><LF>OK<CR><LF>
// or there is at least 1 call
// +CLCC: 1,1,4,0,0,"+420XXXXXXXXX",145<CR><LF>
// <CR><LF>OK<CR><LF>
status = RX_FINISHED;