hi,
I am trying to transfer bytes using the ftdi_sio
driver for my usb-serial converter using ftdi chip
with vendor id 0x067b and product id 0x230. I am using
th below program to transfer bytes.
/***************************************************************************
* Copyright (C) 2003 by Michael Schuster
*
* [EMAIL PROTECTED]
*
*
*
* Last update 15.06.04
*
*
*
* This programm comes without any warranty !!!
*
*
*
* This program is free software; you can
redistribute it and/or modify *
* it under the terms of the GNU General Public
License as published by *
* the Free Software Foundation; either version 2 of
the License, or *
* (at your option) any later version.
*
*
*
* Parts of the code I found somewhere in newsgroups
*
*
*
* Other were inspired by an discussion at
*
* [EMAIL PROTECTED] with
*
* Ned Konz <[EMAIL PROTECTED]> and Ian Abbott
<[EMAIL PROTECTED]> *
*
*
***************************************************************************/
/***************************************************************************
* This programm shows an simple way of
comunication with the ftdi-chip *
* connected to an usb port in the C Language.
*
*
*
* It is intended to show how a single byte
transfer can be implemented *
* You need to verify:
*
* + a kernel with the ftdi_sio (look as root
with lsmod) running *
* + a rs232-subsystem connected (asynchr.) to
the ftdi FT232 BM chip *
***************************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
int data;
int fd;
char a=1;
unsigned char rec;
unsigned char r,s;
struct termios tio,backup;
// define the Baudrate
#define BAUDRATE B9600
int main(int argc, char** arg)
{
//First we open the usbdevice (trying to find the
chip
if ( ( fd = open( "/dev/ttyUSB0", O_RDWR| O_NOCTTY|
O_NDELAY )) < 0 ) {
fprintf(stderr,"Can't open dev/ttyUSB0\n");
if ( ( fd = open( "/dev/ttyUSB0", O_RDWR| O_NOCTTY|
O_NDELAY )) < 0 ) {
fprintf(stderr,"Can't open dev/ttyUSB1 either\n");
return(-1);
}
}
if ( tcgetattr( fd, &tio ) == -1 )
{
fprintf(stderr,"Can't properly open dev/ttyUSB0\n");
};
backup=tio;
// Setting baudrate
if(cfsetispeed(&tio, BAUDRATE) == -1) {
printf("serial_open(): unable to set
input-baudrate\n");
return (-1);
}
if(cfsetospeed(&tio, BAUDRATE) == -1) {
printf("serial_open(): unable to set
output-baudrate\n");
return (-1);
}
// Setting the rawmode
tio.c_lflag &=~(ECHO|ICANON|ISIG|IEXTEN);
tio.c_lflag = tio.c_lflag | (FLUSHO);
tio.c_iflag &=~
(ICRNL|BRKINT|IXON|IXOFF|ISTRIP|INPCK);
tio.c_iflag = tio.c_iflag | (IGNBRK|IMAXBEL|IXANY);
tio.c_cflag &= ~(CSIZE| PARENB);
tio.c_cflag = tio.c_cflag | (CS8 |CREAD| CLOCAL);
tio.c_oflag &= ~(OPOST);
tio.c_cc[VMIN]=1; // Only 1 char to read!
tio.c_cc[VTIME]=0;
if (tio.c_lflag & (ECHO|ICANON|ISIG|IEXTEN))
printf("serial_open(): unable to set terminalmode
-lflag ");
if ( tio.c_iflag & (ICRNL|BRKINT|IXON|ISTRIP|INPCK))
printf("serial_open(): unable to set
terminalmode -iflag \n");
// now clean the line ...
if(tcflush(fd, TCIOFLUSH) == -1) {
printf("serial_open(): unable to flush data\n");
return (-1);
}
// now clean the line ...
if(tcflow(fd, TCIOFLUSH) == -1) {
printf("serial_open(): unable to flush data\n");
return (-1);
}
// ... and activate the settings for the port
if(tcsetattr(fd, TCSANOW, &tio) == -1) {
printf("serial_open(): unable to set new
attributes\n");
return (-1);
}
printf("Sucessfully opened device for read and
write\n");
data=0;
rec=0;
// Now the simple transfer - pretty easy ;)
//
printf("\nPress 'Enter' for next bytetransfer, press
'q' for ending transfer\n");
a='a';
while (a!='q')
{
a=getc(stdin);
write(fd,&s,1);
while (read(fd,&rec,1)==-1);
s=data%255;
printf("\n recieved!");
data++;
printf(" Sent %x \t Recieved %x \n",s,rec);
}
if(tcsetattr(fd, TCSANOW, &backup) == -1) {
printf("serial_open(): unable to restore old
attributes\n");
return (-1);
}
return 0;
}
when i execute I get error :
/etc/usb-test # ./ftdi
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios FAILED
to set databits/stopbits/parity
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios urb
failed to set baurdrate
drivers/usb/serial/ftdi_sio.c: urb failed to clear
flow control
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios FAILED
to set databits/stopbits/parity
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios urb
failed to set baurdrate
drivers/usb/serial/ftdi_sio.c: urb failed to clear
flow control
Sucessfully opened device for read and write
Press 'Enter' for next bytetransfer, press 'q' for
ending transfer
q
drivers/usb/serial/ftdi_sio.c: error from flowcontrol
urb
/etc/usb-test #
Why is the driver throwing so many failures? what
setting should be done so that it does the byte
transfer properly ?
I am using 2.6.11 kernel patched with 2.6.12-rc5 on
s3c2410 contoller.
Regards
Ramya
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