GSM and pic16F877 interface

[Abdulmajeed]

usart_read_text

hey guyz...

i'm interfacing a GSM modem (seimens gsm35) with a PIC16F877.. connected the modem to the USART bus of PIC... i need to send an sms from my gsm.. i wrote this code in microbasic but there's a couple of stuff that i'm not sure about... would you please check my code:

program USART_Test

main:

PORTC = 0     'initialize port C
TRISC = $D0   'configure port C bits

SPBRG = 25
TXSTA = $24
RCSTA = $90
     
Usart_Init(19200)                 ' Initialize USART module

Usart_Write_Text("AT+CMGF=1" + Chr(13) + Chr(10))
Usart_Write_Text("AT+CMGS="+962796626060"" + Chr(13) + Chr(10))
Usart_Write_Text("hello!!")

end.

1- how do i send the CR character? did i handle it correctly with Chr(13)+Chr(10)??
2- in the CMGS command i'm supposed to put the destination in qoutes"" how do i send these???!!!
3- after typing the message code i'm supposed to click CTRL+Z, how do i do this serially from the PIC?!!!
4- assuming constant baud rate should i initiate the USART baud rate to the same baud rate of the GSM?? and plz help me with the AT command that initiates a constant baud rate??

i'm running out of time.. any help appreciated guyz...
regards...[/code]

 

[GSM Man]

pic16f send at modem commands

1 - You don't need to add the LF after the command, only the CR is needed - at least all of the GSM modules I've used work that way.
2 - You use Chr(34) to send a Double quote (")
3 - You send a CTRL-Z with Chr(26)
4 - the command for setting Baud Rate is: AT+IPR=n - where n is the Baud Rate

 

[Abdulmajeed]

mikrobasic usart con 16f877

Thnx man you ROCK!!... i realy appreciate it bud..
i'm afraid that's not just about it!!..

now i connected the PIC (Rx pin) to GPS as the GPS is only a transmitter... i need the PIC to receive the NMEA message from the GPS (in text mode).. here's the code:

Usart_Init(19200)                 ' Initialize USART module
delimeter = "$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41"
if Usart_Data_Ready() = 1 then   ' If data is received
    received_byte = Usart_Read_Text(received_txt,delimeter)  
end if

i want to make sure, does the (USART_Read_text) function expect to receive the same delimeter string i put in the code as is??.. because it won't receive the delimeter i assigned in the code, it will receive the calculated data from the GPS, i just used this delemeter for length and format!!... does it make any sense??..

if this doesn't work should i just use the (USART_Read) function and save the read data into a string with the same length of my message???

 

[Abdulmajeed]

pic16f877 gps

Thnx man you ROCK!!... i realy appreciate it bud..

now i connected the PIC (Rx pin) to GPS as the GPS is only a transmitter... i need the PIC to receive the NMEA message from the GPS (in text mode).. here's the code:

Code:
Usart_Init(19200) ' Initialize USART module
delimeter = "$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41"
if Usart_Data_Ready() = 1 then ' If data is received
received_byte = Usart_Read_Text(received_txt,delimeter)
end if


i want to make sure, does the (USART_Read_text) function expect to receive the same delimeter string i put in the code as is??.. because it won't receive the delimeter i assigned in the code, it will receive the calculated data from the GPS, i just used this delemeter for length and format!!... does it make any sense??..

if this doesn't work should i just use the (USART_Read) function and save the read data into a string with the same length of my message???

 

[mjklein]

May i know you use which software to write that type of programming?Is it Mikro C with C programming?
I will appreciate for the help.Thanks.

 

[m_adra89]

Re: usart_read_text

Usart_Write_Text("AT+CMGF=1" + Chr(13) + Chr(10))
Usart_Write_Text("AT+CMGS="+962796626060"" + Chr(13) + Chr(10))
Usart_Write_Text("hello!!")

thes code for send sms what the code for receved sms and test the sms if="1" then led on