| Brent |
Jun 29th, 2006 5:12 PM |
rs232 class problem
I have a class that sends data through the com port 1 via rs232. The code compiles fine, but everytime I use the class in a program and run the program, a windows error message pops up and says that my program has encountered and error and needs to exit and asks me if i want to send an error report. Im running Windows XP and using a Digital Mars compiler(crappy, I know, but its all I have at the moment until I get VC++ installed again)
here's the class:
:
#ifndef _RS232_H
#define _RS232_H
#include<iostream.h>
#include<string.h>
#include<conio.h>
#define DLL 0 //divisor latch low byte
#define DLH 1 //divisor latch high byte
#define THR 0 //transmit hold register
#define RBR 0 //recieve buffer register
#define IER 1 //interrupt enable register
#define LCR 3 //line control register
#define MCR 4 // modem control register
#define LSR 5 //line status register
#define MSR 6 //modem status register
#define RTS 0x02 // request to send
#define CTS 0x10 //clear to send
#define DTR 0x01 //data terminal ready
#define DSR 0x20 //data set ready
#define RBF 0x01 //bit 0 of LSR, rec buf full
#define THRE 0x20 //bit 5 of LSR, trans reg 0
#define DISINT 0x00 //disable interrupts in IER
#define ABRG 0x83 //access baud rate generator
class rs232
{
public:
rs232();
rs232(int far*);
void init(int,int,char*,int,int);
void set_id(char [50]);
void transmit(char,int);
char receive(int);
char rec(unsigned int);
void send(unsigned int,int);
void send_msg();
void recv_msg();
void listen();
private:
unsigned int divisorh, divisorl, format, acia[2], add;
int val, comport,a;
char byte, data, u_id[50], id[50];
int far* bios;
int com_port, baud_rate, word_size, stops;
char *parity;
char c[10];
};
rs232::rs232()
{
}
rs232::rs232(int far* bios)
{
data=0;
bios=(int far*)0x00400000l;
}
void rs232::send(unsigned int add, int val)
{
_DX=add;
_AL=val;
asm out dx,al
}
char rs232::rec(unsigned int add)
{
_DX=add;
asm in al,dx
return(_AL);
}
void rs232::set_id(char id[50])
{
strcpy(u_id,id);
}
void rs232::init(int com_port,int baud_rate,char *parity,int stops, int word_size)
{
acia[0]=*bios;
acia[1]=*(bios+1);
send(acia[com_port]+IER, DISINT);
send(acia[com_port]+LCR, ABRG);
switch(baud_rate)
{
case 300:
{
divisorh = 01;
divisorl = 0x80;
}
break;
case 600:
{
divisorh = 00;
divisorl = 0xc0;
}
break;
case 1200:
{
divisorh = 00;
divisorl = 0x60;
}
break;
case 2400:
{
divisorh = 00;
divisorl = 0x30;
}
break;
case 4800:
{
divisorh = 00;
divisorl = 0x18;
}
break;
case 9600:
{
divisorh = 00;
divisorl = 0x0c;
}
break;
default:
{
cout<<"ERROR: INVALID BAUD RATE\n";
}
}
send(acia[com_port] + DLL, divisorl);
send(acia[com_port] + DLH, divisorh);
format = 0;
if((strcmp(parity,"E")==0) || (strcmp(parity,"O")==0))
{
format=format | 0x28;
if(strcmp(parity,"E")==0)
{
format=format | 0x10;
}
}
if(stops==2)
{
format=format|0x04;
switch(word_size)
{
case 8:
{
format=format | 0x03;
}
break;
case 7:
{
format=format | 0x02;
}
break;
case 6:
{
format=format | 0x01;
}
break;
case 5:
break;
default:
{
cout<<"ERROR: UNSUPPORTED WORD SIZE\n";
}
}
send(acia[com_port] + LCR, format);
}
}
void rs232::transmit(char byte, int comport)
{
send(acia[comport]+MCR, (RTS | DTR));
while((rec(acia[comport]+LSR) & THRE)==0)
send(acia[comport]+THR, byte);
send(acia[comport]+MCR, 0);
}
char rs232::receive(int comport)
{
send(acia[comport] + MSR, (RTS | DTR));
while((rec(acia[comport]+LSR) & RBF)==0)
send(acia[comport] + MCR,0);
byte = rec(acia[comport] + RBR);
return(byte);
}
void rs232::send_msg()
{
data=0;
while(data < 50)
{
data=getch();
cout<<data;
transmit(data,0);
}
}
void rs232::recv_msg()
{
data=0;
while((data!=50)&&(data!=0))
{
data=receive(0);
cout<<data;
}
}
#endif
and here's the sample program:
:
#include"com.h"
int main()
{
rs232 sock;
sock.init(0,9600,0,1,8);
sock.send_msg();
return 0;
}
sorry for the wacked out indentations. |
