What kernel version?
i've tested with 2.4.18, 2.4.20, and 2.4.21 with the last posted patches
primarily tested with the pl2303 module, however i did get the same response on the mct_u232 and keyspan modules. this same program on a standard rs-232 port works fine. uncommenting various lines and you can make a comparison between "normal" rs-232 behavior and the usb-rs232 version. i used a null modem cable between two pc's, and also tested with two wire (tx/rx/gnd) between a wyse terminal and a pc.
Care to post your .c program?
#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <termios.h> #include <stdio.h>
#define MYDEVICE "/dev/ttyUSB0"
main()
{
int fd,c, res;
struct termios oldtio,newtio;
char buf[255]; fd = open(MYDEVICE, O_RDWR | O_NOCTTY );
if (fd <0) {perror(MYDEVICE); exit(-1); }tcgetattr(fd,&oldtio); /* save current serial port settings */ bzero(&newtio, sizeof(newtio)); /* clear struct for new port settings */
newtio.c_cflag = B9600 | CS8 | CLOCAL | CREAD;
newtio.c_oflag = 0;
/* uncomment this line to test the ONLCR lockup */
// newtio.c_oflag = OPOST | ONLCR;
tcflush(fd, TCIFLUSH); tcsetattr(fd,TCSANOW,&newtio);
strcpy(buf,"test output with newline\n"); write (fd, buf,25);
/* uncoment the next two lines to test cr vs. nl */ // strcpy(buf,"test output with carriage return\r"); // write (fd, buf,33);
tcsetattr(fd,TCSANOW,&oldtio); }
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