it seems odd to me that opening the ctl file would
reset some serial parameters. wouldn't it be better
to leave them alone?
static int
dopen(Usbfs *fs, Fid *fid, int)
{
ulong path;
Serialport *p;
path = fid-qid.path ~fs-qid;
p = fs-aux;
switch(path){
On Sun, Mar 23, 2014 at 7:09 PM, erik quanstrom quans...@quanstro.net wrote:
it seems odd to me that opening the ctl file would
reset some serial parameters. wouldn't it be better
to leave them alone?
What do you return on read if you don´t know the state?
For some devices if you don´t set
On Sun Mar 23 14:35:52 EDT 2014, pau...@gmail.com wrote:
On Sun, Mar 23, 2014 at 7:09 PM, erik quanstrom quans...@quanstro.net wrote:
it seems odd to me that opening the ctl file would
reset some serial parameters. wouldn't it be better
to leave them alone?
What do you return on read
so if i do this
echo l7/dev/eiaU6/eiaUctl
cat /dev/eiaU6/eiaUctl
that's two opens, isn't it? then isn't l reset to 8 by the second
open?
It has been a while and I don´t have the code at hand now, but once
it is at a known state, it shouldn´t set it again, that is
What do you return on read if you don´t know the state?
For some devices if you don´t set the state, you have no idea.
You can do it in read, but it seemed more intuitive in open at the
time, (and you don´t
set the state on every read).
What I meant, is if you
write then read, the read does
On Sun, Mar 23, 2014 at 8:47 PM, Gorka Guardiola pau...@gmail.com wrote:
if(!setonce){
setonce = 1;
serialctl(p, l8 i1); /* default line parameters */
}
And setonce needs to live in the interface, and it needs to be locked, etc.
G.
On Sun Mar 23 15:56:52 EDT 2014, pau...@gmail.com wrote:
On Sun, Mar 23, 2014 at 8:47 PM, Gorka Guardiola pau...@gmail.com wrote:
if(!setonce){
setonce = 1;
serialctl(p, l8 i1); /* default line parameters */
}
And setonce needs to live in the interface, and it needs to
And setonce needs to live in the interface, and it needs to be locked, etc.
another idea: since this is only needed by some hardware. and then only in
init.
why not make it the responsibility of such hardware to do this in the init
fn. then the problem can be addressed without any
On Sun, 23 Mar 2014 16:32:12 EDT erik quanstrom quans...@quanstro.net wrote:
On Sun Mar 23 15:56:52 EDT 2014, pau...@gmail.com wrote:
On Sun, Mar 23, 2014 at 8:47 PM, Gorka Guardiola pau...@gmail.com wrote:
if(!setonce){
setonce = 1;
serialctl(p, l8 i1); /* default
A similar idea here would be to have a default command to
for default settings. When a device is opened, it is
initialized with these settings. The reason I like this is
because then I don't need to teach every serial IO program
what setting to use (often the other end is a dumb device
On Sun, 23 Mar 2014 17:53:22 EDT erik quanstrom quans...@quanstro.net wrote:
A similar idea here would be to have a default command to
for default settings. When a device is opened, it is
initialized with these settings. The reason I like this is
because then I don't need to teach every
i think it is even easier to set the state up properly with cpurc or
consolefs' configuration file, and have the various programs not even
care that they're talking to a serial port.
Not my experience. Occasionally programs do have to care about
some serial port parameters and if such
On Sun, 23 Mar 2014 20:32:07 EDT erik quanstrom quans...@quanstro.net wrote:
i think it is even easier to set the state up properly with cpurc or
consolefs' configuration file, and have the various programs not even
care that they're talking to a serial port.
Not my experience.
Init is probably the right place to do that, except I wouldn't
configure interfaces I am not going to use, because, some times, they
are connected to funky things (like jtag, for example). I used open
to do it on-demand. I don't know if it was the right decision, but
that was the rationale
The issue is program A can leave things in non-working order
and program B running after A has to deal with this. This is
no different from bringing up a system in a known good state.
I think I'd rather be able to have a preceding program be able to set
up the interface and leave it than cater
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