Retriving iCHIP parameter value over RS232 using PIC16F877

[fred]

Hi,
I am using a PIC16F877 to connect to an iCHIP.
I can't retrive the value of the parameter "webpage"over RS232
It works ok when I use a terminal program using the command
"AT+iwebpage?" and returns "1" I have set the ichip to 9600 baud
//?????????????????????????????????????????????????????????????????
//Can't retrive value 1 over RS232 get nothing so it stays in loop>
//Sends AT+i command"query webpage value" which is 1 over RS232
printf("AT+iwebpage?\r\n");
while (y!='1'){//Wait for 1
y=getc();
}
delay_ms(10000);
//??????????????????????????????????????????????????????????????????


here is the whole program
#include <16F877.h>
#device *=16
#fuses HS,NOWDT,NOPROTECT,NOLVP,PUT,NOBROWNOUT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,stream=ichip) // Jumpers: 8 to 11, 7 to 12
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
long agc,temp,ulpa,dlpa,dlcon,ulcon,dllna,ullna,trigger,control0,webpage;
char alarm[8],ip,x,y,a,b,c,d,e,f,g,h,i,j,k,l,z,m,n,o,p,string[30];
main() {
x=a;
while (true){//#3 wait for alarm
printf("AT+iWWW\r\n");//Sends AT+i command"dial modem" over RS232
while (x!='('){//Wait for char ( in I/(xx.xx.xxx.xx)
x=getc();
}
a=getc();
b=getc();
c=getc();
d=getc();
e=getc();
f=getc();
g=getc();
h=getc();
i=getc();
j=getc();
k=getc();
l=getc();
m=getc();
//****************Sends AT+i command"send e-mail" command over RS232 OK*******************************
printf("AT+iEMA:Go to IP Address (%c%c%c%c%c%c%c%c%c%c%c%c%c \r\n",a,b,c,d,e,f,g,h,i,j,k,l,m);
printf(".\r\n");
delay_ms(10000);
//****************Updates parameter tag "webpage" on website-OK***************************************
printf("AT+iwebpage='1'");
printf("\r\n");
delay_ms(10000);

//?????????????????????????????????????????????????????????????????
//Can't retrive value 1 over RS232
//*************Sends AT+i command"query webpage value" which is 1 over RS232
printf("AT+iwebpage?\r\n");
while (y!='1'){//Wait for 1
y=getc();
}
delay_ms(10000);
//??????????????????????????????????????????????????????????????????

//**************Sends AT+i command"send e-mail" command over RS232**************************
printf("AT+iEMA:webpage= %c \r\n",y);
printf(".\r\n");
delay_ms(10000);

}
}

[Andre Jr. Richard]

Hello Fred, I'm new with ichip.

In a month I will program them everyday, so I thing it is possible that we can help us if we exchange.

May it possible to ask you some question ?

which ichip do you use ?

thanks !

André

[Ttelmah]

I'd suggest that the problem is possibly the 'loss' of the first character in the AT string. Unless you have resistors to pull the line to the 'idle' level (high at the PIC), or program the line high at the start of the code, the line will be sitting as an input, till you start to use it. The falling edge on the first bit of the command string will then be missed, and the unit fail to respond (and hence you don't get the reply). Try adding
output_high(PIN_C6);
delay_ms(2);

at the start of main, and see if it then works.

Best Wishes

[fred]

[fred]