com.c

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#include "com.h" 

int comfd;
static	struct termios oldterm;


int speed_arr[7] = {B230400, B115200, B57600,B38400, B19200, B9600, B4800};
int name_arr[7] = {230400, 115200, 57600, 38400, 19200, 9600, 4800};

int openComm(const com_attr_t *ca)
{
	int i=0;
	if((comfd = open(ca->com_device,O_RDWR))<0)
	{
		fprintf(stderr,"COM open Error!\n");
		return -1;
	}
	tcflush(comfd, TCIFLUSH);
	struct termios term;
	bzero(&term, sizeof(term)); 

	if(tcgetattr(comfd,&oldterm) !=0)
	{
		fprintf(stderr,"Setup Serial false!\n");
		return -1;
	}
	
	memcpy(&term,&oldterm,sizeof(oldterm));

	/* Set port settings for canonical input processing */
	term.c_cflag =  CREAD | CLOCAL | HUPCL;
	term.c_cflag &= ~ CRTSCTS;
	term.c_cflag &= ~ PARODD;

	term.c_lflag &= ~ (ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHONL | NOFLSH |ECHOPRT |ECHOCTL | ECHOKE | ECHOK);

	term.c_iflag |= IGNPAR;
	term.c_iflag &= ~(INLCR | ICRNL | IXON | IXOFF | IXOFF | IUCLC |IXANY |IMAXBEL | IUTF8);
	term.c_iflag &= ~IGNBRK;

	term.c_oflag &= ~(ONLCR  | OLCUC | OCRNL | ONOCR | ONLRET | OFILL | OFDEL);
	
	term.c_oflag &= ~OPOST;
	term.c_cc[VMIN] = 150;
	term.c_cc[VTIME] = 8;
	
	switch (ca->databits) /*set databits*/
	{   
	case 7:		
		term.c_cflag |= CS7; 
		break;
	case 8:     
		term.c_cflag |= CS8;
		break;   
	default:    
		fprintf(stderr,"Unsupported data size\n"); return -1;  
	}


	switch (ca->parity) 
	{   
		case 'n':
		case 'N':
			term.c_cflag &= ~PARENB;   /* Clear parity enable */
			term.c_iflag &= ~INPCK;     /* Enable parity checking */ 
			break;  
		case 'o':   
		case 'O':     
			term.c_cflag |= (PARODD | PARENB); /* ODD*/  
			term.c_iflag |= INPCK;             /* Disnable parity checking */ 
			break;  
		case 'e':  
		case 'E':   
			term.c_cflag |= PARENB;     /* Enable parity */    
			term.c_cflag &= ~PARODD;   /* even*/     
			term.c_iflag |= INPCK;       /* Disnable parity checking */
			break;
		case 'S': 
		case 's':  /*as no parity*/   
			term.c_cflag &= ~PARENB;
			term.c_cflag &= ~CSTOPB;
			break;  
		default:   
			fprintf(stderr,"Unsupported parity\n");    
			return -1;  
	}


	if (ca->stopbits == 1)
	{
		term.c_cflag &= ~CSTOPB;
	} 
	else
	{
		term.c_cflag |= CSTOPB; 
	}
	

	 
	tcflush(comfd, TCIOFLUSH);
	//set_speed(comfd,nBaudRate);
	for(i=0;i<7;i++)
	{
		if (ca->baud_rate == name_arr[i])
		{
			
			term.c_cflag |= speed_arr[i];
		}
	}

	if (tcsetattr(comfd,TCSANOW,&term) != 0)   
	{ 
		fprintf(stderr,"SetupSerial 3");   
		return -1;  
	}
	
	return comfd;
}

int closeComm()   
{   
	tcsetattr(comfd,TCSANOW,&oldterm);

    return close(comfd);   
}  

int writeComm(void * pData,int nLength)
{
	int nWrite;
	nWrite=write(comfd,pData,nLength);
	if(nWrite == -1) 
		fprintf(stderr,"Write Com error!\n");
	
	return nWrite;
}

int readComm(void * pData,int nLength)
{
	int nread;
	nread=read(comfd,pData,nLength);
	if (nread == -1)
	{
		fprintf(stderr,"Read com Error!\n");
		return -1;
	}

	return nread;
}