at command code

[chancelier]

Hi everyone,..
i am interfacing sagem modem with a 16F877 to send sms via serial RS232 port.
My only problem is:
How to write the AT-commands in mikroC language?

For example:
AT+CMGR=1 --> This command will read the sms stored in location 1.

I want to know how to translate this command into mikroC.?

help please

regards

 

[Sceadwian]

The AT code is sent as a serial byte string over the RS232 port in ASCII coded letters.

 

[Wilksey]

Well, for a PIC that has a hardware UART, the following would be correct (check baud rate for modem though):

UART1_Init(9600); //For the first hardware UART
Delay_ms(100);   //Allow for the UART to initialise properly
UART1_Write('A');
UART1_Write('T');
UART1_Write('+');
UART1_Write('C');
UART1_Write('M');
UART1_Write('G');
UART1_Write('R');
UART1_Write('=');
UART1_Write('1');
UART1_Write(13);
UART1_Write(10);
Delay_ms(500);

Note the code above, the end UART1_Write with the 13 and 10 are NOT in '' speach marks, this is because it is not a character, but a code, 13 10 is the ascii code for CR(13) LF(10), carriage return line feed.

We add a 500ms delay to allow the UART buffer to write it's data.

This will only work for a hardware UART, there are routines for a software UART i believe if necessary.

To recieve from the UART, you will need a loop and do something like the following:

char received_rd;
while(1)
{
   if(UART1_Data_Ready())
   {
      received_rd = UART1_Read();
      //Process received data
   }
}

All of this was taken from the Mikro C examples and just rearranged to suit your question.

Hope this helps!

Wilksey.

 

[Wilksey]

Note: To check the command you could look for the "OK" or "ERROR" messages that the modem responds with.