modem mystery

[mle]

Hello,
I am having a strange problem trying to dial out with a modem. when I run the program, the modem picks up the phone (goes on-line), but then hangs up and it keeps doing this (not really at regular intervals). Now if I disconnect power to the pic, everything stops at you would expect, BUT if instead of disconnecting power, I connect my MPLAB ICD 2 programmer, the modem stays on-line and dials in successfully!

I thought it might be setting a flow control pin high or something, so I tried playing around with the values of RTS and CTS, but it didn't work.

My code is listed below.
Does anyone have any suggestions??

Thanks,
mle

#include "mylcd.h"
#include "1wire.h"
#include <string.h>

#define DegreeSymbol 223 //ascii code for degree symbol

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#byte ADCON1 = 0X9F //The adcon1 register

/*----------FUNCTIONS-----------*/

/***************Main Program Starts Here*************/
void main(){

//Variables
char phone[8],line1[25];

/*----------configure all the ports-------*/
Set_Tris_A(0x00); //set port A to outputs
Set_Tris_B(0x33); //make RB5, RB4(BUTTONS),
//RB1 (DQin) and RB0(pulse in) inputs
Set_Tris_C(0xD7); //RC7, (Hserin), RC4(RTC),
//RC2, RC1, RC0 inputs
Set_Tris_D(0x00); //set port D to outputs
Set_Tris_E(0x00); //set port E to outputs

/*-----------set PIC registers------------*/
ADCON1=0b00001110;

//Flow control pins
Output_High(PIN_C2); //set CTS to high
Output_Low(PIN_C1); //set RTS to low


delay_us(500);
lcd_init();
lcd_clear();

strcpy(line1, "RS232test"); // copy string
lcd_puts(line1);
delay_ms(1000);
printf("ATDT4333870\%c\%c",10,13);
delay_ms(3000);

while(1);
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516104

[Kevin Howell]

:=Hello,
:=I am having a strange problem trying to dial out with a modem. when I run the program, the modem picks up the phone (goes on-line), but then hangs up and it keeps doing this (not really at regular intervals). Now if I disconnect power to the pic, everything stops at you would expect, BUT if instead of disconnecting power, I connect my MPLAB ICD 2 programmer, the modem stays on-line and dials in successfully!
:=
:=I thought it might be setting a flow control pin high or something, so I tried playing around with the values of RTS and CTS, but it didn't work.
:=
:=My code is listed below.
:=Does anyone have any suggestions??
:=
:=Thanks,
:=mle
:=
:=#include "mylcd.h"
:=#include "1wire.h"
:=#include <string.h>
:=
:=#define DegreeSymbol 223 //ascii code for degree symbol
:=
:=#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
:=
:=#byte ADCON1 = 0X9F //The adcon1 register
:=
:=/*----------FUNCTIONS-----------*/
:=
:=/***************Main Program Starts Here*************/
:=void main(){
:=
:=//Variables
:=char phone[8],line1[25];
:=
:=/*----------configure all the ports-------*/
:=Set_Tris_A(0x00); //set port A to outputs
:=Set_Tris_B(0x33); //make RB5, RB4(BUTTONS),
:= //RB1 (DQin) and RB0(pulse in) inputs
:=Set_Tris_C(0xD7); //RC7, (Hserin), RC4(RTC),
:= //RC2, RC1, RC0 inputs
:=Set_Tris_D(0x00); //set port D to outputs
:=Set_Tris_E(0x00); //set port E to outputs
:=
:=/*-----------set PIC registers------------*/
:=ADCON1=0b00001110;
:=
:=//Flow control pins
:=Output_High(PIN_C2); //set CTS to high
:=Output_Low(PIN_C1); //set RTS to low
:=
:=
:=delay_us(500);
:=lcd_init();
:=lcd_clear();
:=
:=strcpy(line1, "RS232test"); // copy string
:=lcd_puts(line1);
:=delay_ms(1000);
:=printf("ATDT4333870\%c\%c",10,13);
:=delay_ms(3000);
:=
:=while(1);
:=}

Search for "Modem" on the forum and you will find some info that might help (Look for my name - Kevin Howell). I tried the same and it worked for me. The modem has to be "woken up" before you send any commands to it. You basically toggle the DTR line before sending a command to the modem...I had the same problem and I posted the problem on the forum and got a very detailed message from another friendly forum contributor...
Don't know why the ICD2 makes a difference though...

Kevin
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516106