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main7.c
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main7.c
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/* ----------------------------------------------------------------------------------------------
* real GPS car tracker on ATMEGA328P + SIM7000 module - version 2.0
* by Adam Loboda - adam.loboda@wp.pl
* baudrate UART is 9600 as most stable using RC internal clock 1MHz (8MHz with division by 8)
* MCU clock is lowered to 1MHz to reduce power consumption
*
* SIM7000 default serial port speed is 115200 bps
* please configure SIM7000 to fixed 9600 first by AT+IPR=9600 command
* and disable echo by ATE0 command
* to ensure stability, and then save config via AT&W command
* this version is suitable for the SIM7000 boards that have DTR pin exposed, utilizes sleepmode on SIM7000
*
* connections to be made :
* SIM7000 RXD to ATMEGA328 TXD PIN #3,
* SIM7000 TXD to ATMEGA328 RXD PIN #2
* SIM7000 DTR/SLEEP to ATMEGA PC5 PIN #28
* VCC :
* ATMEGA328 VCC (PIN #7) must be connected to lower voltage VCC ~3.3V than 5V of SIM7000 board
* you may use 3x 1N4007 diodes in serial to drop voltage from 5V to ~3.3V
* GND :
* ATMEGA328 GND (PIN #8 and PIN #22) to SIM7000 GND and 0V
* other info :
* the prototype board was built using www.and-global.com BK-808 breadboard
* SIM7000 breadboard which is powered from 5V DC but uses 3.3V TTL logic on RXD/TXD
*
* this version has more accurate positioning from GPS module and SMS command support
* following commands :
* ACTIVATE : validates sending MSISDN as a voice caller
* SINGLE : gives single position result
* MULTI : gives 5 positions with 5 min intervals
* GUARD : enables GUARD MODE - notifies when GPS position changes over SMS
* STOP : disables GUARD MODE if active
* ----------------------------------------------------------------------------------------------
*/
#include <inttypes.h>
#include <stdio.h>
#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <string.h>
#include <avr/power.h>
#include <avr/eeprom.h>
#define UART_NO_DATA 0x0100
// internal RC oscillator 8MHz with divison by 8 and U2X0 = 1, gives 0.2% error rate for 9600 bps UART speed
// and lower current consumption
// for 1MHz : -U lfuse:w:0x62:m on ATMEGA328P
#define F_CPU 1000000UL
// EEPROM address to store phonenumber for messages
#define EEADDR 0
#define BAUD 9600
// formula for 1MHz clock and U2X0 = 1 double UART speed
#define MYUBBR ((F_CPU / (BAUD * 8L)) - 1)
// SIM and GSM related commands
const char AT[] PROGMEM = { "AT\r" };
const char ISATECHO[] PROGMEM = { "AT" };
const char ISOK[] PROGMEM = { "OK" };
const char ISREG1[] PROGMEM = { "+CREG: 0,1" }; // SIM registered in HPLMN
const char ISREG2[] PROGMEM = { "+CREG: 0,5" }; // SIM registered in ROAMING NETWORK
const char SHOW_REGISTRATION[] PROGMEM = {"AT+CREG?\r"};
const char DISREGREPORT[] PROGMEM = {"AT+CREG=0\r"}; // disable reporting URC of losing 2G coverage by +CREG=0
const char PIN_IS_READY[] PROGMEM = {"+CPIN: READY"};
const char PIN_MUST_BE_ENTERED[] PROGMEM = {"+CPIN: SIM PIN"};
const char SHOW_PIN[] PROGMEM = {"AT+CPIN?\r"};
const char ECHO_OFF[] PROGMEM = {"ATE0\r"};
const char ENTER_PIN[] PROGMEM = {"AT+CPIN=\"1111\"\r"};
const char CFGRIPIN[] PROGMEM = {"AT+CFGRI=1\r"};
const char SMS1[] PROGMEM = {"AT+CMGF=1\r"}; // select txt format of SMS
const char SMS2[] PROGMEM = {"AT+CMGS=\""}; // begin of sending SMS in text format
const char DELSMS[] PROGMEM = {"AT+CMGD=4\r"}; // delete all stored SMS just in case
const char SHOWSMS[] PROGMEM = {"AT+CNMI=1,2,0,0,0\r"}; // display automatically SMS when arrives
const char ISSMS[] PROGMEM = {"CMT:"}; // beginning of mobile terminated SMS identification
// SMS commands to be interpreted
const char ISMULTI[] PROGMEM = {"MULTI"}; // MULTI option gives 5 continous measurements
const char ISSINGLE[] PROGMEM = {"SINGLE"}; // SINGLE option gives single measurement GPS or GSM
const char ISACTIVATE[] PROGMEM = {"ACTIVATE"}; // ACTIVATE activates sending number as allowed to call
const char ISGUARD[] PROGMEM = {"GUARD"}; // GUARD mode to automatically alert of GPS position change
const char ISSTOP[] PROGMEM = {"STOP"}; // STOP GUARD mode
const char COMMANDACK[] PROGMEM = {"COMMAND ACCEPTED\n"}; // Acknowledge that the SMS command was accepted
const char COMMANDSINGLEACK[] PROGMEM = {"SINGLE MEASUREMENT IN PROGRESS... PLEASE WAIT 7-8 MINUTES BEFORE NEXT COMMAND\n"}; // Acknowledge that the SINGLE command was accepted
const char COMMANDMULTIACK[] PROGMEM = {"MULTIPLE MEASUREMENTS IN PROGRESS.. PLEASE WAIT 25 MINUTES BEFORE NEXT COMMAND\n"}; // Acknowledge that the MULTI command was accepted
const char ACTIVATED[] PROGMEM = {"ACTIVATED CALLS FROM "}; // Ack activated sending number as allowed to call
const char GUARD[] PROGMEM = {"GUARD MODE ACTIVATED.. PLEASE WAIT 5 MINUTES BEFORE NEXT COMMAND\n"}; // Confirmation of guard mode activated
const char ALERT[] PROGMEM = {"ALERT, POSITION CHANGED TO : "}; // Alert, that guard detected position change
const char STOP[] PROGMEM = {"GUARD MODE STOPPED"}; // Guard mode deactivated
const char CRLF[] PROGMEM = {"\"\n\r"};
// Flightmode ON OFF - for saving battery while in underground garage with no GSM signal
// tracker will check 2G network availability in 30 minutes intervals
// meanwhile radio will be switched off for power saving
const char FLIGHTON[] PROGMEM = { "AT+CFUN=4\r" };
const char FLIGHTOFF[] PROGMEM = { "AT+CFUN=1\r" };
// Sleepmode ON OFF - mode #1 requires DTR pin manipulation,
// to get out of SIM7000 sleepmode DTR must be LOW for at least 50 miliseconds
const char SLEEPON[] PROGMEM = { "AT+CSCLK=1\r" };
const char SLEEPOFF[] PROGMEM = { "AT+CSCLK=0\r" };
// Fix UART speed to 9600 bps
const char SET9600[] PROGMEM = { "AT+IPR=9600\r" };
// Save settings to SIM7000
const char SAVECNF[] PROGMEM = { "AT&W\r" };
// Disable SIM7000 LED for further reduction of power consumption
const char DISABLELED[] PROGMEM = { "AT+CNETLIGHT=0\r" };
// for sending SMS predefined text
const char GOOGLELOC1[] PROGMEM = {"\r\n http://maps.google.com/maps?q="};
const char GOOGLELOC2[] PROGMEM = {","};
const char GOOGLELOC3[] PROGMEM = {"\r\n"};
const char LONG[] PROGMEM = {" LONGTITUDE="};
const char LATT[] PROGMEM = {" LATITUDE="};
const char BATT[] PROGMEM = {"\nBATTERY[mV]="};
// check statuses & cells
const char CHECKBATT[] PROGMEM = {"AT+CBC\r"}; // check battery voltage
// GPS SIM7000 only related AT commands and responses
const char GPSPWRON[] PROGMEM = {"AT+CGNSPWR=1\r"}; // enable GPS inside SIM7000
const char GPSISFIXED[] PROGMEM = {"+CGNSINF: 1,1,"}; // GPS in now fixed
const char GPSINFO[] PROGMEM = {"AT+CGNSINF\r"}; // Read GPS LAT & LONG for SMS
const char GPSCLDSTART[] PROGMEM = {"AT+CGNSCOLD\r"}; // GPS cold restart
const char GPSHOTSTART[] PROGMEM = {"AT+CGNSHOT\r"}; // GPS hot restart
const char GPSPWROFF[] PROGMEM = {"AT+CGNSPWR=0\r"}; // disable GPS inside SIM7000
const char INITLOC[] PROGMEM = {"0000000000000000000\x00"}; // to clear location at the beginning
// buffers for number of phone, responses from modem
// must fit SMS message with details
#define BUFFER_SIZE 170
volatile static uint8_t response[BUFFER_SIZE] = "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
volatile static uint8_t response_pos = 0;
volatile static uint8_t phonenumber[20] = "12345678901234567890";
volatile static uint8_t phonenumber_pos = 0;
volatile static uint8_t smsphonenumber[20] = "12345678901234567890";
volatile static uint8_t smsphonenumber_pos = 0;
volatile static uint8_t smstext[BUFFER_SIZE] = "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
volatile static uint8_t smstext_pos = 0;
// buffers for Google GPS API data - longtitude & latitude data
volatile static uint8_t latitude[20] = "00000000000000000000";
volatile static uint8_t latitude_pos = 0;
volatile static uint8_t longtitude[20] = "00000000000000000000";
volatile static uint8_t longtitude_pos = 0;
// buffers for SIM7000 GPS data - longtitude & latitude data
volatile static uint8_t latitudegps[20] = "00000000000000000000";
volatile static uint8_t longtitudegps[20] = "00000000000000000000";
volatile static uint8_t latitudegpsold[20] = "00000000000000000000";
volatile static uint8_t longtitudegpsold[20] = "00000000000000000000";
// other buffers
volatile static uint8_t buf[40]; // buffer to copy string from PROGMEM for modem output comparision
volatile static uint8_t battery[10] = "0000000000"; // for battery voltage checking
volatile static uint8_t battery_pos = 0;
// other flags and counters
volatile static uint8_t continousgps = 0;
// ----------------------------------------------------------------------------------------------
// init_uart
// ----------------------------------------------------------------------------------------------
void init_uart(void) {
// double speed by U2X0 flag = 1 to have 0.2% error rate on 9600 baud
UCSR0A = (1<<U2X0);
// set baud rate from PRESCALER
UBRR0H = (uint8_t)(MYUBBR>>8);
UBRR0L = (uint8_t)(MYUBBR);
UCSR0B|=(1<<TXEN0); //enable TX
UCSR0B|=(1<<RXEN0); //enable RX
// set frame format for SIM7000 communication
UCSR0C|=(1<<UCSZ00)|(1<<UCSZ01); // no parity, 1 stop bit, 8-bit data
}
// ----------------------------------------------------------------------------------------------
// send_uart
// Sends a single char to UART without ISR
// ----------------------------------------------------------------------------------------------
void send_uart(uint8_t c) {
// wait for empty data register
while (!(UCSR0A & (1<<UDRE0)));
// set data into data register
UDR0 = c;
}
// ----------------------------------------------------------------------------------------------
// receive_uart
// Receives a single char without ISR
// ----------------------------------------------------------------------------------------------
uint8_t receive_uart() {
while ( !(UCSR0A & (1<<RXC0)) )
;
return UDR0;
}
// ----------------------------------------------------------------------------------------------
// function to search RX buffer for response SUB IN RX_BUFFER STR
// ----------------------------------------------------------------------------------------------
uint8_t is_in_rx_buffer(char *str, char *sub, uint8_t buffersize) {
uint8_t i, j=0, k;
for(i=0; i<buffersize; i++)
{
if(str[i] == sub[j])
{
for(k=i, j=0; str[k] && sub[j]; j++, k++) // if NOT NULL on each of strings
if(str[k]!=sub[j]) break; // if different - start comparision with next char
// if(!sub[j]) return 1;
if(j == strlen(sub)) return 1; // full substring has been found
}
}
// substring not found
return 0;
}
// ----------------------------------------------------------------------------------------------
// uart_puts
// Sends a string.
// ----------------------------------------------------------------------------------------------
void uart_puts(const char *s) {
while (*s) {
send_uart(*s);
s++;
}
}
// ----------------------------------------------------------------------------------------------
// uart_puts_P
// Sends a PROGMEM string.
// ----------------------------------------------------------------------------------------------
void uart_puts_P(const char *s) {
while (pgm_read_byte(s) != 0x00) {
send_uart(pgm_read_byte(s++));
}
}
// ------------------------------------------------------------------------------------------------------------
// READLINE from serial port that starts with CRLF and ends with CRLF and put to 'response' buffer what read
// ------------------------------------------------------------------------------------------------------------
uint8_t readline()
{
uint16_t char1, wholeline ;
uint8_t i;
// wait for first CR-LF or exit after timeout 'i' cycles - safe fuse
i = 0;
wholeline = 0;
response_pos = 0;
//
do {
// read single char
char1 = receive_uart();
// if CR-LF combination detected start to copy the response right after
if ( (char1 != 0x0a) && (char1 != 0x0d) && (i<150) )
{ response[response_pos] = char1;
response_pos++;
};
// if CR or LF detected - end of line
if ( char1 == 0x0a || char1 == 0x0d )
{
// if the line was already received & copied and this is only CR/LF ending :
if (response_pos > 0) // this is EoL
{ response[response_pos] = NULL;
response_pos = 0;
wholeline = 1; };
};
// increment number of read chars and check against overflow
i++;
} while ( (wholeline == 0) && (i<150) );
return(1);
}
// ------------------------------------------------------------------------------------------------------------
// Read content of SMS message right after CMT URC and put to 'smstext' buffer what read
// ------------------------------------------------------------------------------------------------------------
uint8_t readsmstxt()
{
uint16_t char1, wholeline ;
uint8_t i;
// wait for first CR-LF or exit after timeout i cycles
i = 0;
wholeline = 0;
smstext_pos = 0;
//
do {
// read single char and check it
char1 = receive_uart();
// if CR-LF combination detected start to copy the response
if ( (char1 != 0x0a) && (char1 != 0x0d) && (i<150) )
{ smstext[smstext_pos] = char1;
smstext_pos++;
};
// if CR or LF detected - end of line
if ( char1 == 0x0a || char1 == 0x0d )
{
// if the line was already received & copied and this is only CR/LF ending :
if (smstext_pos > 0) // this is EoL
{ smstext[smstext_pos] = NULL;
smstext_pos = 0;
wholeline = 1; };
};
// increment number of read chars and check for overflow
i++;
} while ( (wholeline == 0) && (i<150) );
return(1);
}
// ----------------------------------------------------------------------------------------------------------------------------
// read SMS message PHONE NUMBER from +CMT: output and response buffer and copy it to buffer 'phonenumber' for SMS sending
// ----------------------------------------------------------------------------------------------------------------------------
uint8_t readsmsphonenumber()
{
// need 8bit ascii
uint8_t char1;
uint8_t i;
// 'i' is a safe fuse not to get out of response buffer
i = 0;
phonenumber_pos = 0;
// reading from RESPONSE buffer of modem output, rewind to beginning of buffer
response_pos = 0;
// wait for "+CMT:" and space
do {
char1 = response[response_pos];
response_pos++;
i++;
} while ( (char1 != ':') && (i<150) );
// wait for first quotation sign - there will be MSISDN number of sender
do {
char1 = response[response_pos];
response_pos++;
i++;
} while ( (char1 != '\"') && (i<150) );
// if quotation detected start to copy the response - phonenumber
do {
char1 = response[response_pos];
response_pos++;
phonenumber[phonenumber_pos] = char1;
phonenumber_pos++;
i++;
} while ( (char1 != '\"') && (i<150) ); // until end of quotation
// put NULL to end the string phonenumber
phonenumber[phonenumber_pos-1] = NULL;
phonenumber_pos=0;
response_pos = 0;
return (1);
}
// ----------------------------------------------------------------------------------------------
// Read BATTERY VOLTAGE in milivolts from AT+CBC output and put results to 'battery' buffer
// ----------------------------------------------------------------------------------------------
uint8_t readbattery()
{
uint16_t char1;
uint8_t i;
// 'i' is a safe fuse not to get deadlocked in code
i = 0;
battery_pos = 0;
// wait for first COMMA sign
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<70) );
// check if deadlocked
if (i == 70) return(0);
// wait for second COMMA sign
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<70) );
// if 2 COMMA detected start to copy battery voltage to buffer
do {
char1 = receive_uart();
battery[battery_pos] = char1;
battery_pos++;
i++;
} while ( (char1 != 0x0a) && (char1 != 0x0d) && (i<70) );
battery[battery_pos-1] = NULL;
battery_pos=0;
return (1);
}
// -----------------------------------------------------------------------------------------------------
// READ SIM7000 GPS from AT+CGPSINF output and put output to 'lattitude' and 'longtitude' buffers
// -----------------------------------------------------------------------------------------------------
uint8_t readSIM7000gps()
{
uint16_t char1;
uint8_t i;
// 'i' is a safe fuse not to get deadlock on serial port reading
i = 0;
// set positions to start of each buffer
longtitude_pos = 0;
latitude_pos = 0;
uart_puts_P(GPSINFO); // try to retrieve GPS position
// wait for "+CGNSINF:" last sign
do {
char1 = receive_uart();
i++;
} while ( (char1 != ':') && (i<20) );
// check if deadlocked and buffer overrun, there should be +CGPSINF: within first 20 chars
if (i == 20) return(0);
// wait for FIRST COMMA sign - we omit GNSPWR info
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<150) );
// wait for SECOND COMMA sign - we omit GNS fixation info
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<150) );
// wait for THIRD COMMA sign - we omit GNS UTC date-time info
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<150) );
// if COMMA detected start to copy the response - LATITUDE comes first
do {
char1 = receive_uart();
latitude[latitude_pos] = char1;
latitude_pos++;
i++;
} while ( (char1 != ',') && (i<150) );
// put end of string to latitude
latitude[latitude_pos-1] = NULL;
latitude_pos=0;
// if COMMA detected start to copy the response - LONGTITUDE is second
do {
char1 = receive_uart();
longtitude[longtitude_pos] = char1;
longtitude_pos++;
i++;
} while ( (char1 != ',') && (i<150) );
longtitude[longtitude_pos-1] = NULL;
longtitude_pos=0;
// now comes ATTITUDE - bypassing
do {
char1 = receive_uart();
i++;
} while ( (char1 != ',') && (i<150) );
return (1);
}
// --------------------------------------------------------------------------------------------------------------------
// Power on GPS and retrieve position from GPS and put it to LOC and LATT buffers by calling 'readSIM7000gps' function
// --------------------------------------------------------------------------------------------------------------------
uint8_t readgpsinfo()
{
uint8_t gpsattempts, gpsfixed; // counter on attempts to get proper GPS position from SIM7000 - for indoor scenarios
gpsattempts = 0;
gpsfixed = 0;
// if begining/last cycle of continous GPS mode we need to turn on and restart GPS module
if ( (continousgps == 1) || (continousgps == 5) )
{
delay_sec(1);
uart_puts_P(GPSPWRON); // enable SIM7000 GPS power
delay_sec(2);
uart_puts_P(GPSCLDSTART); // cold start of SIM7000 GPS
}
else // during continous mode cycle - we dont need to turn on and restart GPS module
{
delay_sec(1);
// hot start of SIM7000 GPS if needed, otherwise simply poll GPS data
// uart_puts_P(GPSHOTSTART);
};
// now we have to wait some time until SIM7000 gets GPS signal, assume we are waiting 10 minutes
// check the status in 30 sec intervals and then quit
do
{
if ( continousgps != 255 ) delay_sec(15); // in NOT in GUARD mode - wait 15 sec for first fix checking
uart_puts_P(GPSINFO); // check GPS status
if (readline()>0) // check GPS status response if NOT FIXED
{
gpsfixed = 0;
// check if already fixed for GPS coordinates ?
memcpy_P(buf, GPSISFIXED, sizeof(GPSISFIXED));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE ) == 1)
{
// when CGNSINF: 1,1 - stop checking GPS anymore
gpsfixed = 1;
};
// special treatment for GUARD MODE - if not fix quit immediatelly, because there will be repeatition in 1 min
if ( (gpsfixed == 0) && (continousgps == 255) ) return (0);
// there was some fix - 3D or 2D, poll the data from GPS
if ( gpsfixed == 1)
{
// initialize buffers with zero characters first before reading new values from SIM7000 GNSS
memcpy_P(latitudegps, INITLOC, sizeof(INITLOC));
memcpy_P(longtitudegps, INITLOC, sizeof(INITLOC));
readSIM7000gps(); // poll GPS position and parse to buffers LAT & LONG
delay_sec(2);
if (continousgps == 1) // ... if last GPS cycle or single sequence
{ uart_puts_P(GPSPWROFF); // disable SIM7000 GPS power to save battery
delay_sec(1);
};
return(1); // succesful GPS position decoding from SIM7000
} // end of second IF
else gpsattempts++; // if not fixed just increase attempts counter
}; // end of first IF
} while (gpsattempts<20); // end of DO loop - only 20 attempts in 15 sec intervals to get GPS fixation - 5 minutes of searching
// GPS position retrieval not succesful - we are disabling GPS/GNSS power
delay_sec(2);
if (continousgps == 1) // ... if last GPS cycle or single sequence
{ uart_puts_P(GPSPWROFF); // disable SIM7000 GPS power to save battery
delay_sec(1);
};
return(0); // 0 means that GPS was unable to fix on sattelites at all
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
// delay procedure ASM based because _delay_ms() is working bad for 1 MHz clock MCU
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
// delay partucular number of seconds
void delay_sec(uint8_t i)
{
while(i > 0)
{
// Delay 1 000 000 cycles
// 1s at 1 MHz
asm volatile (
" ldi r18, 6" "\n"
" ldi r19, 19" "\n"
" ldi r20, 174" "\n"
"1: dec r20" "\n"
" brne 1b" "\n"
" dec r19" "\n"
" brne 1b" "\n"
" dec r18" "\n"
" brne 1b" "\n"
" rjmp 1f" "\n"
"1:" "\n"
);
i--; // decrease another second
}; // repeat until i not zero
}
//
// delay multiplication of 50 microseconds
//
void delay_50usec()
{
// Generated by delay loop calculator
// at http://www.bretmulvey.com/avrdelay.html
// Delay 50 cycles
// 50us at 1 MHz
asm volatile (
" ldi r18, 16" "\n"
"1: dec r18" "\n"
" brne 1b" "\n"
" rjmp 1f" "\n"
"1:" "\n"
);
}
//////////////////////////////////////////
// SIM7000 initialization procedures
//////////////////////////////////////////
// -------------------------------------------------------------------------------
// wait for first AT in case SIM7000 is starting up
// -------------------------------------------------------------------------------
uint8_t checkat()
{
uint8_t initialized2;
// wait for first OK while sending AT - autosensing speed on SIM7000, but we are working 9600 bps
// SIM 800L can be set by AT+IPR=9600 to fix this speed
// which I do recommend by connecting SIM7000 to PC using putty and FTD232 cable
initialized2 = 0;
do {
uart_puts_P(AT);
if (readline()>0)
{ // check if OK was received
memcpy_P(buf, ISOK, sizeof(ISOK));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) initialized2 = 1;
}
else
{ // maybe ECHO is ON and first line was AT
memcpy_P(buf, ISATECHO, sizeof(ISATECHO));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) initialized2 = 1;
};
delay_sec(1);
} while (initialized2 == 0);
// send ECHO OFF
delay_sec(1);
uart_puts_P(ECHO_OFF);
delay_sec(1);
return (1);
}
// -------------------------------------------------------------------------------
// check if PIN is needed and enter PIN 1111
// -------------------------------------------------------------------------------
uint8_t checkpin()
{
uint8_t initialized2;
// readline and wait for PIN CODE STATUS if needed send PIN 1111 to SIM card if required
initialized2 = 0;
do {
delay_sec(2);
uart_puts_P(SHOW_PIN);
if (readline()>0)
{
memcpy_P(buf, PIN_IS_READY, sizeof(PIN_IS_READY));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) initialized2 = 1;
memcpy_P(buf, PIN_MUST_BE_ENTERED, sizeof(PIN_MUST_BE_ENTERED));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1)
{
delay_sec(1);
uart_puts_P(ENTER_PIN); // ENTER PIN 1111
delay_sec(1);
};
};
} while (initialized2 == 0);
return (1);
}
// -------------------------------------------------------------------------------
// check if registered to the network
// -------------------------------------------------------------------------------
uint8_t checkregistration()
{
uint8_t initialized2, attempt2, nbrminutes;
// readline and wait for STATUS NETWORK REGISTRATION from SIM7000
// first 2 networks preferred from SIM list are OK
initialized2 = 0;
nbrminutes = 0;
attempt2 = 0;
// check if already registered first and quit immediately if true
delay_sec(1);
uart_puts_P(SHOW_REGISTRATION);
if (readline()>0)
{
memcpy_P(buf, ISREG1, sizeof(ISREG1));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) return(1);
memcpy_P(buf, ISREG2, sizeof(ISREG2));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) return(1);
}
// if not registered enable radio.. just in case
// TURN ON RADIO IF WAS NOT BEFORE
delay_sec(1);
uart_puts_P(FLIGHTOFF); // disable airplane mode - turn on radio and start to search for networks
do {
delay_sec(120); // first searching 1 min in case of instability
// now after searching check if already registered to 2G GSM
uart_puts_P(SHOW_REGISTRATION);
if (readline()>0)
{
memcpy_P(buf, ISREG1, sizeof(ISREG1));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) initialized2 = 1;
memcpy_P(buf, ISREG2, sizeof(ISREG2));
if (is_in_rx_buffer(response, buf, BUFFER_SIZE) == 1) initialized2 = 1;
// if not registered do a backoff for 1 hour, maybe in underground garage or something
if (initialized2 == 0)
{
// if not registered or something wrong turn off RADIO for minutes
// this is not to drain battery in underground garage
delay_sec(1);
uart_puts_P(FLIGHTON); // enable airplane mode - turn off radio
delay_sec(1);
uart_puts_P(GPSPWROFF);
// enter SLEEP MODE of SIM800L for power saving when no coverage
delay_sec(1);
uart_puts_P(SLEEPON);
// now wait XX min before turning on radio again, here XX = 30 min
for (nbrminutes = 0; nbrminutes<30; nbrminutes++)
{
delay_sec(60);
};
// Wake up SIM800L and search for network again
// disable SLEEPMODE
PORTC &= ~_BV(PC5); // Toggle LOW the DTR pin of SIM7000
// send first dummy AT command
uart_puts_P(AT);
delay_sec(1);
uart_puts_P(SLEEPOFF); // switch off to SLEEPMODE = 0
delay_sec(1);
PORTC |= _BV(PC5); // Toggles again HIGH the DTR pin
delay_sec(1);
uart_puts_P(FLIGHTOFF); // disable airplane mode - turn on radio and start to search for networks
}; // end of no-coverage IF
}
attempt2++; // increase number of attempts - max 24 attempts = 12 hours of no signal 2G network
// end of DO loop
} while ( (initialized2 == 0) && (attempt2 < 24) );
return initialized2;
}
//////////////////////////////////////////////////////////////////////////////////
// POWER SAVING mode on ATMEGA 328P handling to reduce the battery consumption
// this part of code can be used ONLY if you have SIM7000 RI/RING PIN connected
// to ATMEGA D2/INT0 interrupt input - otherwise program will hang
//////////////////////////////////////////////////////////////////////////////////
void sleepnow(void)
{
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
DDRD &= ~(1 << DDD2); // Clear the PD2 pin
// PD2 (PCINT0 pin) is now an input
PORTD |= (1 << PORTD2); // turn On the Pull-up
// PD2 is now an input with pull-up enabled
// stop interrupts for configuration period
cli();
// update again INT0 conditions
EICRA &= ~(1 << ISC01); // set INT0 to trigger on low level
EICRA &= ~(1 << ISC00); // set INT0 to trigger on low level
EIMSK |= (1 << INT0); // Turns on INT0 (set bit)
sei(); //ensure interrupts enabled so we can wake up again
sleep_cpu(); //go to sleep
// MCU ATTMEGA328P sleeps here until INT0 interrupt
sleep_disable(); //wake up here
}
// when interrupt from INT0 disable next interrupts from RING pin of SIM7000 and go back to main code
ISR(INT0_vect)
{
EIMSK &= ~(1 << INT0); // Turns off INT0 (clear bit)
}
// *********************************************************************************************************
//
// MAIN PROGRAM
//
// *********************************************************************************************************
int main(void) {
uint8_t initialized, ringrcvd, attempt, gpsdataavailable, char1;
double latdiff, longdiff;
uint32_t nbr50useconds;
uint32_t nbrseconds;
attempt = 0; // number of attempts for GPRS connections
initialized = 0; // flag for getting in-out of loops
ringrcvd = 0; // flag if there was anything valuable received
latdiff = 0; // calculation of position change for GUARD MODE
longdiff = 0; // calculation of position change for GUARD MODE
nbr50useconds = 0; // timer for checking serial port activities or SIM7000 chip sanity
nbrseconds = 0; // used for delay function
continousgps = 0; // distinguish between modes : 1 = single, 5 = multi, 255 = guard
gpsdataavailable = 0; // flag if real GPS data from SIM7000 were OK
// enable INPUT on INT0 / PD2 (ATMEGA PIN #4) to connect RI/RING from SIM7000 if available
DDRD &= ~(1 << DDD2); // Clear the PD2 pin - PD2 (PCINT0 pin) is now an input
PORTD |= (1 << PORTD2); // turn On the Pull-up - PD2 is now an input with pull-up enabled
// enable output to control DTR signal of SIM7000
// ATMEGA pin PC5 must be connected to DTR/SLEEP signal of SIM7000 board
DDRC |= (1<<5) ; // set OUTPUT mode for PC5
// PORTC &= ~_BV(PC5); // Toggle LOW the DTR pin of SIM7000
PORTC |= _BV(PC5); // Toggles HIGH the DTR pin
// pull up RXD input on ATMEGA
//DDRD &= ~(1 << DDD0); // Clear the PD2 pin
// PD2 (PCINT0 pin) is now an input
//PORTD |= (1 << PORTD0); // turn On the Pull-up
// PD2 is now an input with pull-up enabled
// initialize variables
memcpy_P(latitudegpsold, INITLOC, sizeof(INITLOC));
memcpy_P(latitudegps, INITLOC, sizeof(INITLOC));
memcpy_P(longtitudegpsold, INITLOC, sizeof(INITLOC));
memcpy_P(longtitudegps, INITLOC, sizeof(INITLOC));
// initialize 9600 baud 8N1 RS232
init_uart();
// delay 10 seconds for safe SIM7000 startup and network registration
delay_sec(10);
// turno of ECHO proactively
uart_puts_P(ECHO_OFF);
delay_sec(1);
// try to communicate with SIM7000 over AT
checkat();
delay_sec(1);
// Fix UART speed to 9600 bps to disable autosensing
uart_puts_P(SET9600);
delay_sec(1);
// TURN ON RADIO IF WAS NOT BEFORE
uart_puts_P(FLIGHTOFF);
delay_sec(1);
// if you have connected SIM7000 board RI/RING pint to ATMEGA328P INT0 pin
// configure RI PIN activity for URC ( unsolicited messages like restart of the modem or battery low)
// uart_puts_P(CFGRIPIN);
// delay_sec(2);
// disable reporting URC of losing 2G coverage by +CREG=0
uart_puts_P(DISREGREPORT);
delay_sec(1);
// Save settings to SIM7000
uart_puts_P(SAVECNF);
delay_sec(3);
// check PIN status
checkpin();
delay_sec(1);
// delete all previous SMSes and SMS confirmation to keep SIM7000 memory empty
uart_puts_P(SMS1);
delay_sec(1);
uart_puts_P(DELSMS);
// delay another 90 sec to search for GSM network
delay_sec(90);
// check registration status
checkregistration();
// neverending LOOP
while (1) {
do {
// WAIT FOR RING message - incoming voice call and send SMS or restart RADIO module if no signal
initialized = 0;
ringrcvd = 0;
continousgps = 0;
nbr50useconds = 0UL;
nbrseconds = 0;
// marker for SIM7000 GPS data availability
gpsdataavailable = 0;
delay_sec(1);
// set mode to display incoming SMS, will be needed for retrieval of originating MSISDN
uart_puts_P(SMS1);
delay_sec(1);
uart_puts_P(SHOWSMS);
delay_sec(1);
// OPTIONAL
// Disable LED blinking on SIM7000
// uart_puts_P(DISABLELED);
// delay_sec(2);
// enter SLEEP MODE #1 of SIM7000 for power saving
// ( will be interrupted by incoming voice call or SMS ) and RING URC
uart_puts_P(GPSPWROFF);
delay_sec(1);
uart_puts_P(SLEEPON);
delay_sec(2);
// ONLY if you have connected SIM7000 RI/RING pin to ATMEGA328P INT0 pin
// otherwise program will HANG here
// enter SLEEP MODE on ATMEGA328P for power saving
//
//
// if using sleepnow() do not use periodic check of RI/RIN below
//