Hi Guys today we will see GSM Interfacing with LPC2148.
Post Contents
Suggest To Read
Components Required
- GSM SIM900A module
- LPC2148 Development Board
GSM Interfacing with LPC2148
Connection
Micro controller’s RX (P0.1) is connected into GSM module’s TX and Micro controller’s TX(P0.0) is Connected into GSM module’s RX pin.
Code
SMS Sending Code
This code is used to send the message to the particular number.
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#include <lpc214x.h> #define NUMBER "9876543210" //Here insert your number where you want to send message void ser_init(void); void tx(unsigned char c); unsigned char rx(void); void tx_str(unsigned char *s); void sms(unsigned char *num1,unsigned char *msg); void gsm_delay(void); unsigned int dell; int main() { ser_init(); sms(NUMBER, "Welcome to the Embetronicx"); while(1); } void sms(unsigned char *num1,unsigned char *msg) { tx_str("AT"); tx(0x0d); gsm_delay(); tx_str("AT+CMGF=1"); tx(0x0d); gsm_delay(); tx_str("AT+CMGS="); tx('"'); while(*num1) tx(*num1++); tx('"'); tx(0x0d); gsm_delay(); while(*msg) tx(*msg++); tx(0x1a); gsm_delay(); } void gsm_delay() { unsigned long int gsm_del,ff; for(gsm_del=0;gsm_del<=500000;gsm_del++) for(ff=0;ff<25;ff++); } void ser_init() { VPBDIV=0x02; //PCLK = 30MHz PINSEL0=0x5; U0LCR=0x83; U0DLL=195; U0DLM=0; U0LCR=0x03; U0TER=(1<<7); } void tx(unsigned char c) { U0THR=c; while((U0LSR&(1<<5))==0); } void tx_str(unsigned char *s) { while(*s) { tx(*s++); } } unsigned char rx() { while((U0LSR&(1<<0))==0); return U0RBR; } |
Calling Code
This code is used to Call to the particular number.
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#include <lpc214x.h> #define NUMBER "9876543210" //Here insert your number where you want to send message void ser_init(void); void tx(unsigned char c); unsigned char rx(void); void tx_str(unsigned char *s); void call(unsigned char *num2); void gsm_delay(void); unsigned int dell; int main() { ser_init(); call(NUMBER); while(1); } void call(unsigned char *num2) { tx_str("AT"); tx(0x0d); gsm_delay(); tx_str("AT+CMGF=1"); tx(0x0d); gsm_delay(); tx_str("ATD"); while(*num2) tx(*num2++); tx(';'); tx(0x0d); for(dell=0;dell<=30;dell++) gsm_delay(); tx_str("ATH"); tx(0x0d); gsm_delay(); } void gsm_delay() { unsigned long int gsm_del,ff; for(gsm_del=0;gsm_del<=500000;gsm_del++) for(ff=0;ff<25;ff++); } void ser_init() { VPBDIV=0x02; //PCLK = 30MHz PINSEL0=0x5; U0LCR=0x83; U0DLL=195; U0DLM=0; U0LCR=0x03; U0TER=(1<<7); } void tx(unsigned char c) { U0THR=c; while((U0LSR&(1<<5))==0); } void tx_str(unsigned char *s) { while(*s) { tx(*s++); } } unsigned char rx() { while((U0LSR&(1<<0))==0); return U0RBR; } |
That’s guys… You can use this code for send a message and call to particular number. If you have any doubt please comment below.
can u explain this line tx(0x0d) in the prgm.
In GSM Point of View, Whenever we are sending any string we need to press enter button. Then only it understands that is end of the string. In our program, we are sending AT. Then we need to press enter button. Instead of that we can send the ASCII value of that enter button.
Enter’s ASCII Value is 0x0D(hex) or 13(decimal).
Tq so much. I found ur code very helpful. But I am getting error as argument of type “long long” is incompatible with parameter of type “unsigned char*” at line 18 sms(NUMBER, “Welcome to electronics”). Can u explain this too. I need more help about gsm. Can u help me that too. My mail I’d is [email protected]
Hi Ganga,
Thanks for your appreciate. Sorry. Now I have updated the source code. Please try it now. Thank you.