ttytest.c

linux 基于 s3c2440 的rs485驱动及测试程序,可正常收发16Mhz字节数据!

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rs232.h"

#include <assert.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>

//#define DEBUG

#define RS485SENTBEGIN  1
#define RS485SENTOVER   2

struct PortInfo ports[MAX_PORTS];

struct rs485de_ctl
{
	long BaudRate;
	int parity;
	int dataBits;
	int stopBits;	
	long count;
};

/*
** Function: OpenCom
**
** Description:
**    Opens a serial port with default parameters
**
** Arguments:
**    portNo - handle used for further access
**    deviceName - the name of the device to open
**
** Returns:
**    -1 on failure
*/
int OpenCom(int portNo, const char deviceName[],long baudRate)
{
    return OpenComConfig(portNo, deviceName, baudRate, 1, 8, 1, 0, 0);
}

/*

*/
long GetBaudRate(long baudRate)
{
    long BaudR;
    switch(baudRate)
    {
	case 115200:
		BaudR=B115200;
		break;
	case 57600:
		BaudR=B57600;
		break;
	case 19200:
		BaudR=B19200;
		break;
	case 38400:
		BaudR=B38400;
		break;	
	case 9600:
		BaudR=B9600;
		break;
	default:
		BaudR=B0;
    }
    return BaudR;
}

/*
** Function: OpenComConfig
**
** Description:
**    Opens a serial port with the specified parameters
**
** Arguments:
**    portNo - handle used for further access
**    deviceName - the name of the device to open
**    baudRate - rate to open (57600 for example)
**    parity - 0 for no parity
**    dataBits - 7 or 8
**    stopBits - 1 or 2
**    iqSize - ignored
**    oqSize - ignored
**
** Returns:
**    -1 on failure
**
** Limitations:
**    parity, stopBits, iqSize, and oqSize are ignored
*/



int OpenComConfig(int port,
                  const char deviceName[],
                  long baudRate,
                  int parity,
                  int dataBits,
                  int stopBits,
                  int iqSize,
                  int oqSize)
{
    struct termios newtio;
    long BaudR;

    ports[port].busy = 1;
    strcpy(ports[port].name,deviceName);
    if ((ports[port].handle = open(deviceName, O_RDWR, 0666)) == -1)
    {
        perror("open");
       // assert(0);
    }


    /* set the port to raw I/O */
	
    newtio.c_cflag = CS8 | CLOCAL | CREAD ;
    newtio.c_cflag &= ~PARENB;
   newtio.c_cflag &= ~CSTOPB; /* 1 stop bit */
    //newtio.c_iflag &= ~INPCK; 
    newtio.c_iflag = IGNPAR;
    newtio.c_iflag &=~(ICANON|ECHO|ECHOE|ISIG) ;
    //newtio.c_iflag &=(IXON|IXOFF|IXANY);
    newtio.c_oflag = 0;
    //newtio.c_oflag &= ~OPOST;
    newtio.c_lflag = 0;
    newtio.c_cc[VINTR]    = 0;
    newtio.c_cc[VQUIT]    = 0;
    newtio.c_cc[VERASE]   = 0;
    newtio.c_cc[VKILL]    = 0;   
    newtio.c_cc[VTIME]    = 1;
    newtio.c_cc[VMIN]     = 18;
    newtio.c_cc[VSWTC]    = 0;
    newtio.c_cc[VSTART]   = 0;
    newtio.c_cc[VSTOP]    = 0;
    newtio.c_cc[VSUSP]    = 0;
    newtio.c_cc[VEOL]     = 0;
    newtio.c_cc[VREPRINT] = 0;
    newtio.c_cc[VDISCARD] = 0;
    newtio.c_cc[VWERASE]  = 0;
    newtio.c_cc[VLNEXT]   = 0;
    newtio.c_cc[VEOL2]    = 0; 
    cfsetospeed(&newtio, GetBaudRate(baudRate));
    cfsetispeed(&newtio, GetBaudRate(baudRate));
    tcsetattr(ports[port].handle, TCSANOW, &newtio);
    return 0;
}

/*
** Function: CloseCom
**
** Description:
**    Closes a previously opened port
**
** Arguments:
**    The port handle to close
**
**    Returns:
**    -1 on failure
*/
int CloseCom(int portNo)
{
    if (ports[portNo].busy)
    {
        close(ports[portNo].handle);
        ports[portNo].busy = 0;
        return 0;
    }
    else
    {
        return -1;
    }
}

/*
** Function: ComRd
**
** Description:
**    Reads the specified number of bytes from the port.
**    Returns when these bytes have been read, or timeout occurs.
**
** Arguments:
**    portNo - the handle
**    buf - where to store the data
**    maxCnt - the maximum number of bytes to read
**
** Returns:
**    The actual number of bytes read
*/
int ComRd(int portNo, char buf[], int maxCnt,int Timeout)
{
    int actualRead = 0;
    fd_set rfds;
    struct timeval tv;
    int retval;
 
    if (!ports[portNo].busy)
    {
        assert(0);
    }
    /*
    /* camp on the port until data appears or 5 seconds have passed */
    FD_ZERO(&rfds);
    FD_SET(ports[portNo].handle, &rfds);
    tv.tv_sec = Timeout/1000;
    tv.tv_usec = (Timeout%1000)*1000;
    retval = select(16, &rfds, NULL, NULL, &tv);

    if (retval)
    {
        actualRead = read(ports[portNo].handle, buf, maxCnt);
    }
    
#ifdef DEBUG
	if(actualRead>0)
    {
        unsigned int i;
        for (i = 0; i < actualRead; ++i)
        {
            if ((buf[i] > 0x20) && (buf[i] < 0x7f))
            {
                printf("<'%c'", buf[i]);
            }
            else
            {
                printf("<%02X", buf[i]);
            }
        }
	printf("\n");
    }
    fflush(stdout);
#endif /* DEBUG */

    return actualRead;
}

/*
** Function: ComWrt
**
** Description:
**    Writes out the specified bytes to the port
**
** Arguments:
**    portNo - the handle of the port
**    buf - the bytes to write
**    maxCnt - how many to write
**
** Returns:
**    The actual number of bytes written
*/
int ComWrt(int portNo, const char *buf, int maxCnt)
{
    int written;
  
    if (!ports[portNo].busy)
    {
        assert(0);
    }
	/*
#ifdef DEBUG
    {
        int i;
        for (i = 0; i < maxCnt; ++i)
        {
            if ((buf[i] > 0x20) && (buf[i] < 0x7f))
            {
                printf(">'%c'", buf[i]);
            }
            else
            {
                printf(">%02X", buf[i]);
            }
        }
	printf("\n");
    }
    fflush(stdout);
#endif /* DEBUG */
    
    written = write(ports[portNo].handle, buf, maxCnt);
    return written;
}



















main(int argc, unsigned long *argv[])
{
	int ret,portno,nWritten,nRead;
	int i;
	unsigned long ba;
	char buf[256];
	//portno=2;
	int fd_de,val;
  struct rs485de_ctl de_example;
  portno=2;
  //printf("argc is %d \n",argc);
  //printf("argv[0] is %s, argv[1] is %s \n",argv[0],argv[1]);
  if(argc==1)
  	ba=9600;
  else if(argc>=2)
  {
  	ba=atoi(argv[1]);
  	}
  else;
	while(1)
	{
		printf("\n1:SEND ,2:RECEIVE,0:quit :");		
		scanf("%d",&val);
		if(val==1)
		{
  		for(i=0;i<256;i++)
  		buf[i]=i;
			ret=OpenCom(portno,"/dev/ttyS1",ba);
			if(ret==-1)
			{
				perror("The /dev/ttyS1 open error.");
				exit(1);
			}
		
			if((fd_de=open("/dev/rs485driver",O_RDONLY | O_NONBLOCK))<0)
			{
				perror("can not open device\n");
				exit(1);
			}
			memset(&de_example,0,sizeof(struct rs485de_ctl));
			de_example.BaudRate=ba;
			de_example.parity=0;
			de_example.dataBits=8;
			de_example.stopBits=1;
			de_example.count=16;
			//ioctl(fd_de,RS485SENTBEGIN,NULL);
			for(i=0;i<4*4;i++)
			{
			ioctl(fd_de,RS485SENTBEGIN,NULL);
			ComWrt(portno,buf,16);
			ioctl(fd_de,RS485SENTOVER,&de_example);
			}

			close(fd_de);
			CloseCom(portno);
		}
		else if(val==2)
		{
			ret=OpenCom(portno,"/dev/ttyS1",ba);
			if(ret==-1)
			{
				perror("The /dev/ttyS1 open error.");
				exit(1);
			}
			memset(buf,0,256);
			fflush(stdout);
			nRead=ComRd(portno,buf,256,5000);
			if(nRead>0)
			{
				printf("Read %d data\n",nRead);
				for(i=0;i<nRead;i++)
				 printf("0x%x ",buf[i]);
				printf("\n");
			}
			else
				printf("TimeOut\n");
			CloseCom(portno);
		}
		else
		{
			exit(0);
			}
	}
	return 0;
}