Hello. I'm having great problems with this device. I have to make it work
in a raw mode in order to communicate to CashCode Billvalidator. But a can't
write data in pl2303.
My /proc/bus/usb/devices is
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 4 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
I tried to connect normal serial port (ttyS1) and Prolific device with
direct cable. My test program is:
#include <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <strings.h>
int main(void){
int fd1,fd2;
struct termios new_tio;
char buf[10]="";
fd1= open("/dev/ttyS1",O_RDWR | O_NOCTTY);
fd2= open("/dev/ttyUSB0",O_RDWR | O_NOCTTY);
bzero(&new_tio,sizeof(new_tio));
new_tio.c_iflag = IGNPAR;
new_tio.c_oflag = 0;
new_tio.c_lflag = 0;
new_tio.c_cflag = CRTSCTS | CS8 | CLOCAL | CREAD;
new_tio.c_cc[VTIME] = 0;
new_tio.c_cc[VMIN] = 0;
cfsetospeed(&new_tio, B19200);
cfsetispeed(&new_tio, B19200);
tcflush(fd1, TCIFLUSH);
tcsetattr(fd1,TCSANOW,&new_tio);
tcflush(fd2, TCIFLUSH);
tcsetattr(fd2,TCSANOW,&new_tio);
write(fd2, "Test\n",6);
sleep(1);
read(fd1,buf,6);
printf("%s",buf);
close(fd1);
close(fd2);
return 1;
}
1. When I try to send data from fd1 to fd2 I have very strange situation. In
the first time I receive "Test".... BUT!!!! In the second time "est" (T is
missing). At the third run every thing is normal. And so on. I lose first
character each second time.
2. When I try to send data from fd2 to fd1 (write to pl2303) I have more
strange situation. can send "Test" only one time (at the first attempt)
after that I can run the program several times but nothing is received
UNTILL I reattach the device.
My system is Slackware Linux 10.1 with 2.6.11.4
Hope for your help.
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