Hi!
google didn't provide any useful help, so...
I am trying to access some measuring devices (currently three) via a
serial RS232 link. As the the machine has only one
real serial port I'm using USB 1.1->serial convertors based on the
Prolific PL-2303X. While I can talk to one external device (although
sometimes I get errors probably due to lost characters) the other two do
not respond at all (one of these is connected via
a nullmodem cable).
If I'm using the built-in serial port I have no problems.
I am using something like the following program to communicate with the
external devices:
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <assert.h>
#include <stdarg.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
const char dev_name[] = "/dev/ttyUSB0";
int main()
{
int dev;
struct termios term;
int bits;
char buf[80];
int l;
dev=open(dev_name, O_RDWR);
tcgetattr(dev, &term);
term.c_lflag &= ~(ICANON | ECHO);
term.c_cflag &= ~CRTSCTS;
term.c_cflag |= CSTOPB;
term.c_cflag &= ~PARENB;
term.c_cflag &= ~(CSIZE | HUPCL);
term.c_cflag |= CS8;
term.c_cflag |= (CLOCAL | CREAD);
term.c_iflag &= ~(IXON | IXOFF);
term.c_iflag |= (IGNBRK | IGNPAR | INPCK | IXANY);
term.c_iflag &= ~(BRKINT | IGNCR | ICRNL | INLCR | ISTRIP
| IUCLC | PARMRK);
term.c_oflag |= (OPOST);
term.c_oflag &= ~(OCRNL | OFILL | OLCUC | ONLCR | ONLRET | ONOCR);
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 30;
cfsetispeed(&term, B2400);
cfsetospeed(&term, B2400);
tcflush(dev, TCIOFLUSH);
tcsetattr(dev, TCSANOW, &term);
bits = TIOCM_DTR;
ioctl(dev, TIOCMBIC, &bits);
bits = TIOCM_RTS;
ioctl(dev, TIOCMBIS, &bits);
tcflush(dev, TCIOFLUSH);
printf("Using device file %s\n", dev_name);
write(dev, "\xFC", 1); /* Command for the external device to send us a
value */
l = read(dev, &buf, 18);
buf[l] = '\0';
printf("%d char(s) read. Input: >%s<\n", l, buf);
for ( l = 0; l < 18 && buf[l] != '\0' ; ++l )
printf("%d ", buf[l]);
printf("\n");
return 0;
}
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Using device file /dev/ttyUSB0
0 char(s) read. Input: ><
Sometimes also values of -16 (decimal) or the character '2' are returned.
Proof that the communication is possible via ttyS0 (c-source adjusted
accordingly):
Using device file /dev/ttyS0
8 char(s) read. Input: > 22.6 <
32 32 32 50 50 46 54 32
The value is in fact a temperature in °C.
Here the kernel log (started with "insmod pl2303.ko debug=1"):
Mar 31 10:31:51 linux kernel: drivers/usb/serial/usb-serial.c: USB Serial
deregistering driver PL-2303
Mar 31 10:32:01 linux kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for PL-2303
Mar 31 10:32:01 linux kernel: pl2303 1-2:1.0: PL-2303 converter detected
Mar 31 10:32:01 linux kernel: usb 1-2: PL-2303 converter now attached to
ttyUSB0 (or usb/tts/0 for devfs)
Mar 31 10:32:01 linux kernel: drivers/usb/core/usb.c: registered new
driver pl2303
Mar 31 10:32:01 linux kernel: drivers/usb/serial/pl2303.c: Prolific PL2303
USB to serial adaptor driver v0.10
Mar 31 10:32:01 linux /etc/hotplug/tty.agent[2740]: add tty device
/class/tty/ttyUSB0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_open -
port 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8484:0x0 1 - 2
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0x40:0x1:0x404:0x0 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8484:0x0 1 - 2
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8383:0x0 1 - 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8484:0x0 1 - 2
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0x40:0x1:0x404:0x1 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8484:0x0 1 - 2
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
0xc0:0x1:0x8383:0x0 1 - 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - port 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7
- 60 9 0 0 2 0 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - data bits = 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - baud = 9600
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - stop bits = 1
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - parity = none
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0x21:0x20:0:0 7
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
set_control_lines - value = 3, retval = 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7
- 80 25 0 0 0 0 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_open -
submitting read urb
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_open -
submitting interrupt urb
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
(0) cmd = 0x5401
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
not supported = 0x5401
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
(0) cmd = 0x540b
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
not supported = 0x540b
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
(0) cmd = 0x5402
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
not supported = 0x5402
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - port 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7
- 80 25 0 0 0 0 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - data bits = 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - baud = 2400
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - stop bits = 2
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_set_termios - parity = none
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0x21:0x20:0:0 7
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: 0xa1:0x21:0:0 7
- 60 9 0 0 2 0 8
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
(0) cmd = 0x5401
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
not supported = 0x5401
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
set_control_lines - value = 2, retval = 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
set_control_lines - value = 2, retval = 0
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
(0) cmd = 0x540b
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_ioctl
not supported = 0x540b
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_write -
port 0, 1 bytes
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c: pl2303_write -
length = 1, data = fc
Mar 31 10:32:38 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_write_bulk_callback - port 0
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c: pl2303_close -
port 0
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c: pl2303_close -
shutting down urbs
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c: pl2303_close -
usb_unlink_urb (write_urb) failed with reason: -43
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_read_bulk_callback - port 0
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_read_bulk_callback - urb->status = -2
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_read_bulk_callback - port is closed, exiting.
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_read_int_callback (0)
Mar 31 10:32:41 linux kernel: drivers/usb/serial/pl2303.c:
pl2303_read_int_callback - urb shutting down with status: -2
Mar 31 10:51:50 linux -- MARK --
Mar 31 10:59:00 linux /USR/SBIN/CRON[2812]: (root) CMD ( rm -f
/var/spool/cron/lastrun/cron.hourly)
Here the output of "cat /proc/bus/usb/devices_please-use-sysfs-instead":
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.4-52-default uhci_hcd
S: Product=UHCI Host Controller
S: SerialNumber=0000:00:07.2
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=067b ProdID=2303 Rev= 3.00
S: Manufacturer=Prolific Technology Inc.
S: Product=USB-Serial Controller
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303
E: Ad=81(I) Atr=03(Int.) MxPS= 10 Ivl=1ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=83(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
System is
SUSE 9.1
Linux linux 2.6.4-52-default #1 Wed Apr 7 02:08:30 UTC 2004 i686 i686 i386
GNU/Linux
Any help is greatly appreciated (I have to meet a deadline next week)!
Best regards,
Oliver
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