PIC16F877A failed to send to gsm modem..

[lazyhut]

HELP...PIC16F877A failed to send to gsm modem..

gsm modem model: MOD 9001D RS232 GSM/GPRS
Microcontroller: PIC16F877A
software:MikroC

I am newbie in mikro C programming and AT command to send SMS in microcontroller.
I tried this Command code via hyperterminal it worked.
i have connect it with PIC16F877A via max232
My problem is:
when connect using microcontroller it won't send message to my phone and reply data from gsm modem.



Hypertiminal Command:

AT+CMGF=1 [enter]
O.K           [received]
AT+CMGS="xxxxxx" [enter]
>              [received]
Testing123 ctr+Z [sent]

Programming:

void ADC_value_to_PC(){

uart1_write_text("at+cmgf=1");
UART1_Write(13);
UART1_Write(10);
delay_ms(5000);

UART1_Write_text("AT+CMGS=\"xxxxxxx\"");
UART1_Write(13);
UART1_Write(10);
delay_ms(5000);

UART1_Write_Text("Testing123");
UART1_Write(0x1A);
}

void main() {
TRISA=0x01;                    //I/O declarations
TRISB=0x00;
TRISC=0x00;
TRISD=0x00;
TRISE=0x00;

PORTA=0xFE;                    //Ports declarations
PORTB=0x00;
PORTC=0x00;
PORTD=0xff;
PORTE=0x07;

uart1_init(9600);
delay_ms(5000);
ADC_value_to_PC();            //Call function
}

below is my connection of max232 via mircocontroller

 

[ckshivaram]

you can swap tx and rx pin on one end of cable and try... sometimes pc and controllers use cross cable...

i dont see you sending 0x0d and 0x0a combination eqvivalent to enter on keyboard

 

[lazyhut]

you can swap tx and rx pin on one end of cable and try... sometimes pc and controllers use cross cable...

i dont see you sending 0x0d and 0x0a combination eqvivalent to enter on keyboard

Enter Key = <CR> + <LF>

UART1_Write(13);
UART1_Write(10);

<CTRL> + Z = 0x1A

UART1_Write(0x1A);

 

[ckshivaram]

connect pic to terminal and see if code is working properly with the same cable that you use for testing modem and terminal....

 

[DineshSL]

Hi lazyhut,

Instead of using 5s delay after AT+CMGS command, you can read modem output for that command.

Check modem datasheet for correct response for AT+CMGS command and compare it with received string. After receiving correct response you may enter message-Text.

It might work with 5s delay but checking response will ensure correct operation.

Thank you,

 

[lazyhut]

connect pic to terminal and see if code is working properly with the same cable that you use for testing modem and terminal....

yes...jz try it...i connect pic to hyper terminal...it can sent out properly..
but when switch to modem..it still wont work...
i think is my programming problem...

 

[ckshivaram]

there were post earlier with same problem with many people...

check these links

https://www.edaboard.com/threads/192604/

are testing baud rate and pic baud rate same??? try swapping cable tx and rx at one end and try....

 

[lazyhut]

there were post earlier with same problem with many people...

check these links

https://www.edaboard.com/threads/192604/

are testing baud rate and pic baud rate same??? try swapping cable tx and rx at one end and try....

same...still wont work...gsm modem still cannot send to my phone...T.T

---------- Post added at 12:26 ---------- Previous post was at 10:44 ----------

there were post earlier with same problem with many people...

check these links

https://www.edaboard.com/threads/192604/
are testing baud rate and pic baud rate same??? try swapping cable tx and rx at one end and try....

hi sir, now i can send from my gsm modem to my phone already....
btw, how to receive from GSM modem...