Girish Desai <dcgirish16@...> writes:
>
> Hi,
> I am facing a strange issue.. in case any one has faced this kind of issue
and have any suggestions, please let me know...
>
> if I would like to send and array of 8 bytes such as below through UART
such as ttySAC1, ttySAC2 etc, the byte containing 'zero' is not
transmitted.. below is the example...
>
> I have an array of unsigned char alph[] = {'a', 'b', 'c', 'd', 'e', 0x00,
'g', 'h'};
>
> when this is transmitted over UART, the output would be "abcdegh" only
seven characters and the zero is missing...
>
>
> in the same way, one more.. try sending unsigned char reset[] = {0x01,
0x06, 0x00, 0x01, 0x00, 0x01, 0x19, 0xCA};
>
>
> I would only see "01 06 01 01 19 CA" only 6 bytes.. byte containing zeros
are missing again..
>
>
> in case any one have had this kind of issue and have suggestions, please
let me know...
>
>
> Thanks,
> Girish
>
>
You may not be setting serial in raw mode thus some text conversion are
happening.
Try some settings below (note to raw):
struct termios options;
fd = open("/dev/ttySAC1", O_RDWR | O_NOCTTY | O_NDELAY );
if (fd == -1)
{
perror("open_port: Unable to open /dev/ttyS0 - ");
}
else
{
fcntl(fd, F_SETFL, 0);
}
tcgetattr(fd, &options);
// clear all struct termios elements
memset(&options, 0, sizeof(options));
cfsetispeed(&options, B38400);
cfsetospeed(&options, B38400);
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
//options.c_cflag &= ~PARODD
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
options.c_cflag &= ~CRTSCTS;
options.c_cflag &= ~CRTSCTS;
options.c_oflag &= ~OPOST;
//options.c_lflag |= (ICANON | ECHO | ECHOE); // canonical input not RAW
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); //raw input
options.c_iflag &= ~(ICRNL | IXON | IXOFF | IXANY | INPCK | PARMRK); //
disable xon xoff & no parity check*/
options.c_iflag |= IGNPAR;
options.c_iflag &= ~ISTRIP;
tcsetattr(fd, TCSANOW, &options);
I hope this helps,
Gilson
