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Is this the way to make connection between Modem<=>18f

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syide

Joined: 10 Nov 2008
Posts: 16
Location: Malaysia

Is this the way to make connection between Modem<=>18f

Posted: Mon Feb 23, 2009 12:57 am

Hello,

Anyone please tell me whether this code will work.

I try to connect Siemen Hc25 terminal with PIC.
PIC work as client to send data to server in PC.

Siemen HC25 did have TCP/IP stack AT cammand. Here is the code

Code:

#include <18F4620.h>
#fuses H4, NOFCMEN, NOXINST, NOIESO, NOPBADEN, MCLR, NOWDT, NOPROTECT, NODEBUG, NOSTVREN
#use delay(clock=4000000)

#define STACK_USE_PPP 1
#define STACK_USE_MAC 0
#define STACK_USE_ICMP 1 //for ping
#define STACK_USE_TCP 1 //To send TCP packets (talk to HTTP clients)

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

#include "tcpip/stacktsk.c" //include Microchip's TCP/IP stack

#define MY_HTTP_SOCKET 80

int8 HTTPSocket=INVALID_SOCKET;

void HTTPPut(char c) {
TCPPut(HTTPSocket, c);
}

void HTTPTask(void) {
static enum {HTTP_ST_CONNECT=0, HTTP_ST_WAIT_CONNECT=1, HTTP_ST_GET=2,
HTTP_ST_PUT=3, HTTP_ST_DISCONNECT=4, HTTP_ST_FORCE_DISCONNECT=5} state=0;
static TICKTYPE timeout_counter;
TICKTYPE current;
static char lc, lc2;
char c;
char content[250];
int8 a0, a1;

current=TickGet();

if (!MACIsLinked()) {
if (HTTPSocket!=INVALID_SOCKET) {
state=HTTP_ST_FORCE_DISCONNECT;
}
}
if (HTTPSocket==INVALID_SOCKET)
state=HTTP_ST_CONNECT;

switch(state) {
case HTTP_ST_CONNECT:
if (MACIsLinked()) {
HTTPSocket=TCPListen(MY_HTTP_SOCKET);
if (HTTPSocket!=INVALID_SOCKET) {
state=HTTP_ST_WAIT_CONNECT;
}
}
break;

case HTTP_ST_WAIT_CONNECT:
if (TCPIsConnected(HTTPSocket)) {
state=HTTP_ST_GET;
timeout_counter=current;
}
break;

case HTTP_ST_GET:
if (!TCPIsConnected(HTTPSocket)) {
state=HTTP_ST_FORCE_DISCONNECT;
break;
}
if (TCPIsGetReady(HTTPSocket)) {
while (TCPGet(HTTPSocket, &c)) {
if ( (c=='\n') && (lc2=='\n') ) {
state=HTTP_ST_PUT;
timeout_counter=current;
TCPDiscard(HTTPSocket);
break;
}
lc2=lc;
lc=c;
}
}
else if (TickGetDiff(current, timeout_counter) > ((int16)30 * TICKS_PER_SECOND))
state=HTTP_ST_DISCONNECT;
break;

case HTTP_ST_PUT:
if (!TCPIsConnected(HTTPSocket)) {
state=HTTP_ST_FORCE_DISCONNECT;
break;
}
if (TCPIsPutReady(HTTPSocket)) {
a0=read_adc();
set_adc_channel(1);
delay_us(20);
a1=read_adc();
set_adc_channel(0);

sprintf(content, "<HTML><BODY><H1>HELLO</H1><P>AN0 = 0x%X<BR>AN1 = 0x%X</BODY></HTML>", a0, a1);
printf(HTTPPut, "HTTP/1.1 200 OK\r\n");
printf(HTTPPut, "Content-Type: text/html\r\n");
printf(HTTPPut, "Content-Length: %u\r\n",strlen(content));
printf(HTTPPut, "\r\n");
printf(HTTPPut, "%s", content);
TCPFlush(HTTPSocket);
state=HTTP_ST_GET;
timeout_counter=current;
}
else if (TickGetDiff(current, timeout_counter) > ((int16)30 * TICKS_PER_SECOND))
state=HTTP_ST_DISCONNECT;
break;

case HTTP_ST_DISCONNECT:
if (TCPIsPutReady(HTTPSocket))
state=HTTP_ST_FORCE_DISCONNECT;
else
break;

case HTTP_ST_FORCE_DISCONNECT:
TCPDisconnect(HTTPSocket);
HTTPSocket=INVALID_SOCKET;
state=HTTP_ST_CONNECT;
break;
}
}

char ppp_username[32];
char ppp_password[32];
char ppp_phonenumber[20];

void ISPInit(void) {
sprintf(ppp_username, " ");
sprintf(ppp_password, " ");
sprintf(ppp_phonenumber, "*99***1#");
}

void main(void) {
MODEM_RESP resp;

ISPInit();

//setup_adc_ports(ANALOG_AN0_TO_AN1);
//set_tris_a(3); //set A0 and A1 to input for ADC
//set_tris_b(0);
//setup_adc(ADC_CLOCK_INTERNAL);

StackInit();

while(TRUE) {
if (!ppp_is_connected() && !ppp_is_connecting()) {
printf("\fDialing");
resp=ppp_connect(ppp_username, ppp_password, ppp_phonenumber);
if (resp==MODEM_BUSY) {
printf("\fBusy Signal");
delay_ms(2000);
}
else if (resp==MODEM_NO_DIALTONE) {
printf("\fNo Dialtone");
delay_ms(2000);
}
else if (resp!=MODEM_CONNECTED) {
printf("\fDial Error");
delay_ms(2000);
}
else {
printf("\f%LUbps", connected_baudrate);
printf("\nNegotiating PPP");
}
}
StackTask();
HTTPTask();
}
}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Feb 23, 2009 1:52 pm

Quote:

#include <18F4620.h>
#fuses H4, NOFCMEN, NOXINST, NOIESO, NOPBADEN, MCLR, NOWDT, NOPROTECT, NODEBUG, NOSTVREN
#use delay(clock=4000000)

I didn't look closely at your program, but there is one immediate error.
You're using the H4 fuse, but your clock speed is set to 4 MHz.
The H4 fuse multiplies the crystal frequency by 4. So if you have a
10 MHz crystal, you get 40 MHz oscillator speed. If you really have a 4
MHz crystal, then change the fuse to XT instead of H4.

Quote:

a0=read_adc();
set_adc_channel(1);
delay_us(20);
a1=read_adc();
set_adc_channel(0);

You should set the channel before you read the adc. Not after.
This is the correct order for the lines of code:

Code:

set_adc_channel(0);
delay_us(20);
result = read_adc();

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