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b20: serial port bugs
- To: gnu-win32 at cygnus dot com
- Subject: b20: serial port bugs
- From: Marko Kohtala <marko dot kohtala at ntc dot nokia dot com>
- Date: Mon, 02 Nov 1998 19:12:58 +0200
- Organization: Nokia
I use NT 4.0 SP3 and Cygwin B20.
CSIZE and CBAUD use one same bit. Therefore CS8 sets a bit that is used
for B57600 and B115200.
select() never tells that something is available for read from a serial
port.
When select returns with timeout, the read bitmask (at least) still has
all the bits set. I think they should be zeroed, since the descriptors
are not available for read.
Even read() never gives any characters from serial port.
ioctl TCGETA and TCSETA return error.
I have set using tcsetattr() the following settings:
c_iflag = IGNBRK | INPCK;
c_oflag = 0;
c_cflag = B9600 | CS8 | CREAD |CLOCAL | HUPCL | PARENB;
c_lflag = 0;
c_cc[VMIN] = 0;
c_cc[VTIME] = 0;
I tried VMIN = 1. It seemed not to block as it is supposed to, but
read() returned with 0 when there was no characters. However, with this
setting I was able to read characters for a while, but after a couple of
characters it seemed to stop. I have given up debugging for now.
Ctrl-C in gdb seems to kill the gdb.
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