Hii to all the members here at Electronicspoint.
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//Program to interface GSM Modem with PIC18F4550 Microcontroller
//This code takes four choices as four inputs
//Choice 1 : Test the simple AT Command.
//Choice 2 : Find out the IMEI number of the GSM Modem.
//Choice 3 : Connect a call to a GSM mobile number.
//Choice 4 : Send a text message to a mobile number.
#define FREQ 12000000
#define baud 9600
#define spbrg_value (((FREQ/64)/baud)-1)
#define rs LATA.F0
#define rw LATA.F1
#define en LATA.F2
#define lcdport LATB
void tx_data(unsigned char);
unsigned char rx_data();
void lcd_ini();
void lcdcmd(unsigned char);
void lcddata(unsigned char);
void gsm_cmd(unsigned char *);
void output(void);
unsigned char value=0;
int i=0,j,k,temp,flag,choice;
unsigned char *starting_text="Enter choice=";
unsigned char *dial_text="Dialing...";
unsigned char *at_cmd="AT";
unsigned char *imei_cmd="AT+GSN";
unsigned char *call_cmd="ATD1xxxxxxxxx;"; // Provide a 10-Digit Mobile Number
unsigned char *sms_format="AT+CMGF=1";
unsigned char *sms_write="AT+CMGS=\"xxxxxxxxxx\""; // 10-Digit Mobile Number
unsigned char *sms="Hello";
unsigned char *sms_report="SMS Sent...";
unsigned char sms_terminate=0x1A;
unsigned char enter=0x0D;
unsigned char *data;
void main()
{
TRISB=0; // Set Port B as output port
LATB=0;
TRISA=0;
LATA=0;
TRISD=0xFF;
LATD=0;
SPBRG=spbrg_value; // Fill SPBRG register to set the baud rate
RCSTA.SPEN=1; // To activate serial port (Tx and Rx pins)
TXSTA.TXEN=1; // Activate Transmissiom
RCSTA.CREN=1; // Activate Reception
PIE1.RCIE=1; // Enable Reception interrupt
INTCON.GIE=1; // Enable Global interrupt
INTCON.PEIE=1; // Enable Peripheral interrupt
lcd_ini();
while(1)
{
k=0;
lcdcmd(0x80);
while(starting_text[k]!='\0')
{
lcddata(starting_text[k]);
k++;
}
//Check inputs
//Choice 1
if(PORTD.F0)
{
gsm_cmd(at_cmd);
output();
Delay_ms(1000);
}
//Choice 2
if(PORTD.F1)
{
gsm_cmd(imei_cmd);
output();
Delay_ms(1000);
}
//Choice 3
if(PORTD.F2)
{
gsm_cmd(call_cmd);
output();
Delay_ms(1000);
}
//Choice 4
if(PORTD.F3)
{
gsm_cmd(sms_format);
output();
Delay_ms(1000);
gsm_cmd(sms_write);
output();
Delay_ms(1000);
gsm_cmd(sms);
output();
tx_data(0x1A);
Delay_ms(1000);
}
}
}
void gsm_cmd(unsigned char *string)
{
i=0;j=0;
while(string!='\0')
{
temp=0;
if(string==0x5C) // Not to send '\' cahracter
i++;
tx_data(string); // Send by serial communication
i++;
while(temp!=1);
}
temp=0;
tx_data(enter); // Send ASCII code for 'Enter' key
while(temp!=1);
}
void output(void) // To print data on LCD
{
lcdcmd(0x01);
i=-1;flag=0;
while(i<j)
{
if(flag>1)
{
flag=0;
Delay_ms(500);
lcdcmd(0x01);
lcdcmd(0x80);
}
if(data==0x0A) // This condition is to avoid double Enter
// during execution of a command
{
flag++;
lcdcmd(0xc0);
}
if(data=='>'||data=='"') // Not to print this character
{
i++;
lcdcmd(0xc0);
}
if(data!=0x0D&&data!=0x0A&&data!=0x1A) // Condition to print the data
// except 'Enter','New line' and 'Submit'
{
lcddata(data);
i++;
}
else
i++;
Delay_ms(300);
}
lcdcmd(0x01);
}
void tx_data(unsigned char serial_data) // Transmit data function
{
TXREG=serial_data;
while(PIR1.TXIF==0);
}
void interrupt()
{
data[j]=RCREG; // Store the data into array when Reception interrupt occurs
value=RCREG;
j++;
temp=1;
}
void lcd_ini()
{
lcdcmd(0x38); // Configure the LCD in 8-bit mode, 2 line and 5x7 font
lcdcmd(0x0C); // Display On and Cursor Off
lcdcmd(0x01); // Clear display screen
lcdcmd(0x06); // Increment cursor
lcdcmd(0x80); // Set cursor position to 1st line, 1st column
}
void lcdcmd(unsigned char cmdout)
{
lcdport=cmdout; //Send command to lcdport=PORTB
rs=0;
rw=0;
en=1;
Delay_ms(10);
en=0;
}
void lcddata(unsigned char dataout)
{
lcdport=dataout; //Send data to lcdport=PORTB
rs=1;
rw=0;
en=1;
Delay_ms(10);
en=0;
}
The Program above is doing the following steps :
1. Store all AT commands into strings.
2. Set the baud rate of microcontroller to 9600bps.
3. Enable serial port. (Refer USART with PIC)
4. Enable the global and peripheral interrupt bits of the INTCON register.
5. Configure Port D as input port.
6. Use if condition to detect the pressed switch.
7. As switch is pressed, process the corresponding AT command and transmit via USART.
8. Reception interrupt method is used to store the GSM output data into an array.
9. Display the stored value on the LCD. (Refer displaying text on LCD using PIC)
I want to modify the above program with only 4th choice (i.e. to send the characters to the mobile number) so that i can do the following steps:
1. Store all AT commands into strings.
2. Set the baud rate of microcontroller to 9600bps.
3. Enable serial port. (Refer USART with PIC)
4. Enable the global and peripheral interrupt bits of the INTCON register.
5. Configure Port D as input port.
6. Process the corresponding AT command and transmit via USART.
7. Recieve the characters at USART (rx) one by one into array.
8. Transmit the characters via the USART (tx)
Would really appreciate if someone can suggest me the required modification that is to be done in the code...
=======================================
//Program to interface GSM Modem with PIC18F4550 Microcontroller
//This code takes four choices as four inputs
//Choice 1 : Test the simple AT Command.
//Choice 2 : Find out the IMEI number of the GSM Modem.
//Choice 3 : Connect a call to a GSM mobile number.
//Choice 4 : Send a text message to a mobile number.
#define FREQ 12000000
#define baud 9600
#define spbrg_value (((FREQ/64)/baud)-1)
#define rs LATA.F0
#define rw LATA.F1
#define en LATA.F2
#define lcdport LATB
void tx_data(unsigned char);
unsigned char rx_data();
void lcd_ini();
void lcdcmd(unsigned char);
void lcddata(unsigned char);
void gsm_cmd(unsigned char *);
void output(void);
unsigned char value=0;
int i=0,j,k,temp,flag,choice;
unsigned char *starting_text="Enter choice=";
unsigned char *dial_text="Dialing...";
unsigned char *at_cmd="AT";
unsigned char *imei_cmd="AT+GSN";
unsigned char *call_cmd="ATD1xxxxxxxxx;"; // Provide a 10-Digit Mobile Number
unsigned char *sms_format="AT+CMGF=1";
unsigned char *sms_write="AT+CMGS=\"xxxxxxxxxx\""; // 10-Digit Mobile Number
unsigned char *sms="Hello";
unsigned char *sms_report="SMS Sent...";
unsigned char sms_terminate=0x1A;
unsigned char enter=0x0D;
unsigned char *data;
void main()
{
TRISB=0; // Set Port B as output port
LATB=0;
TRISA=0;
LATA=0;
TRISD=0xFF;
LATD=0;
SPBRG=spbrg_value; // Fill SPBRG register to set the baud rate
RCSTA.SPEN=1; // To activate serial port (Tx and Rx pins)
TXSTA.TXEN=1; // Activate Transmissiom
RCSTA.CREN=1; // Activate Reception
PIE1.RCIE=1; // Enable Reception interrupt
INTCON.GIE=1; // Enable Global interrupt
INTCON.PEIE=1; // Enable Peripheral interrupt
lcd_ini();
while(1)
{
k=0;
lcdcmd(0x80);
while(starting_text[k]!='\0')
{
lcddata(starting_text[k]);
k++;
}
//Check inputs
//Choice 1
if(PORTD.F0)
{
gsm_cmd(at_cmd);
output();
Delay_ms(1000);
}
//Choice 2
if(PORTD.F1)
{
gsm_cmd(imei_cmd);
output();
Delay_ms(1000);
}
//Choice 3
if(PORTD.F2)
{
gsm_cmd(call_cmd);
output();
Delay_ms(1000);
}
//Choice 4
if(PORTD.F3)
{
gsm_cmd(sms_format);
output();
Delay_ms(1000);
gsm_cmd(sms_write);
output();
Delay_ms(1000);
gsm_cmd(sms);
output();
tx_data(0x1A);
Delay_ms(1000);
}
}
}
void gsm_cmd(unsigned char *string)
{
i=0;j=0;
while(string!='\0')
{
temp=0;
if(string==0x5C) // Not to send '\' cahracter
i++;
tx_data(string); // Send by serial communication
i++;
while(temp!=1);
}
temp=0;
tx_data(enter); // Send ASCII code for 'Enter' key
while(temp!=1);
}
void output(void) // To print data on LCD
{
lcdcmd(0x01);
i=-1;flag=0;
while(i<j)
{
if(flag>1)
{
flag=0;
Delay_ms(500);
lcdcmd(0x01);
lcdcmd(0x80);
}
if(data==0x0A) // This condition is to avoid double Enter
// during execution of a command
{
flag++;
lcdcmd(0xc0);
}
if(data=='>'||data=='"') // Not to print this character
{
i++;
lcdcmd(0xc0);
}
if(data!=0x0D&&data!=0x0A&&data!=0x1A) // Condition to print the data
// except 'Enter','New line' and 'Submit'
{
lcddata(data);
i++;
}
else
i++;
Delay_ms(300);
}
lcdcmd(0x01);
}
void tx_data(unsigned char serial_data) // Transmit data function
{
TXREG=serial_data;
while(PIR1.TXIF==0);
}
void interrupt()
{
data[j]=RCREG; // Store the data into array when Reception interrupt occurs
value=RCREG;
j++;
temp=1;
}
void lcd_ini()
{
lcdcmd(0x38); // Configure the LCD in 8-bit mode, 2 line and 5x7 font
lcdcmd(0x0C); // Display On and Cursor Off
lcdcmd(0x01); // Clear display screen
lcdcmd(0x06); // Increment cursor
lcdcmd(0x80); // Set cursor position to 1st line, 1st column
}
void lcdcmd(unsigned char cmdout)
{
lcdport=cmdout; //Send command to lcdport=PORTB
rs=0;
rw=0;
en=1;
Delay_ms(10);
en=0;
}
void lcddata(unsigned char dataout)
{
lcdport=dataout; //Send data to lcdport=PORTB
rs=1;
rw=0;
en=1;
Delay_ms(10);
en=0;
}
The Program above is doing the following steps :
1. Store all AT commands into strings.
2. Set the baud rate of microcontroller to 9600bps.
3. Enable serial port. (Refer USART with PIC)
4. Enable the global and peripheral interrupt bits of the INTCON register.
5. Configure Port D as input port.
6. Use if condition to detect the pressed switch.
7. As switch is pressed, process the corresponding AT command and transmit via USART.
8. Reception interrupt method is used to store the GSM output data into an array.
9. Display the stored value on the LCD. (Refer displaying text on LCD using PIC)
I want to modify the above program with only 4th choice (i.e. to send the characters to the mobile number) so that i can do the following steps:
1. Store all AT commands into strings.
2. Set the baud rate of microcontroller to 9600bps.
3. Enable serial port. (Refer USART with PIC)
4. Enable the global and peripheral interrupt bits of the INTCON register.
5. Configure Port D as input port.
6. Process the corresponding AT command and transmit via USART.
7. Recieve the characters at USART (rx) one by one into array.
8. Transmit the characters via the USART (tx)
Would really appreciate if someone can suggest me the required modification that is to be done in the code...
