[BRLTTY] Focus 1 70 display and USB to serial adapter: possible connecting this scenario?

[Hammer Attila]

Hi Dave,


The stty -F /dev/ttyS0 -a command shows following output when Focus 1 
display is use in real serial connection the /dev/ttyS0 port (the 
display this situation full functional and right presents Orca output in 
Mate Terminal):

speed 57600 baud; rows 0; columns 0; line = 0;
intr = <undef>; quit = <undef>; erase = <undef>; kill = <undef>; eof = <undef>;
eol = <undef>; eol2 = <undef>; swtch = <undef>; start = <undef>; stop = <undef>;
susp = <undef>; rprnt = <undef>; werase = <undef>; lnext = <undef>;
discard = <undef>; min = 0; time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread clocal -crtscts
ignbrk -brkint ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
-opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
-isig -icanon iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt
-echoctl -echoke -flusho -extproc


Hopefully this information help, this is the right result when happens a 
real serial to serial connection.

Interesting this right result, I looked the  stty -F /dev/ttyACM0 device 
when attached the focus display, you will be see the difference what 
happens when I trying attaching the USB serial cable between the 
computer USB port and the Focus1 display real serial port.
Default wrong baud rate calibrate I think the serial dongle (9600 baud) 
the /dev/ttyACM0 device, and the other data fields is possible wrong.
Looks following lines:
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt 
= ^R;
werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon 
-ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 
vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke -flusho -extproc

So, I try founding a command how can possible changing on the fly the 
USB dongle baud rate, and an Ubuntu forum founded following command 
suggestion:
screen ttyACM0 57600
Not the best way, but this command works, beginning working the Focus 
display with USB serial cable the /dev/ttyACM0 device, until restart not 
happening.
  After screen ttyACM0 57600 command the stty -F /dev/ttyACM0 -a command 
shows following right result:
speed 57600 baud; rows 0; columns 0; line = 0;
intr = <undef>; quit = <undef>; erase = <undef>; kill = <undef>; eof = 
<undef>;
eol = <undef>; eol2 = <undef>; swtch = <undef>; start = <undef>; stop = 
<undef>;
susp = <undef>; rprnt = <undef>; werase = <undef>; lnext = <undef>;
discard = <undef>; min = 0; time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread clocal -crtscts
ignbrk -brkint ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon 
-ixoff
-iuclc -ixany -imaxbel -iutf8
-opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 
bs0 vt0 ff0
-isig -icanon iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop 
-echoprt
-echoctl -echoke -flusho -extproc

I tested this solution with my newer machine and notebook, works perfect.
Only the baud rate need store persistent, the brltty.conf file not 
provide possibility the FS driver to set serial baud rate if a display 
is attached with usb serial adapter?

With your help, I can use this old Focus 1 display on a traditional 
serial port and with the USB serial converter on my newer machines, 
where there is no physical serial port, this help was a lifesaver for me 
in terms of Hungarian Braille developments, because Braille board 
developments can best be tested with a real Braille display.
But why the automatic detection of the display does not work with the 
original traditional USB cable is a good question.
Thank you for your help.

Attila
2024. 12. 23. 19:09 keltezéssel, Dave Mielke írta:
> [quoted lines by Hammer Attila on 2024/12/23 at 12:53 +0100]
>
>> With safe testing environment the building related, I am use now the Debian
>> 12 awailable 6.7 version sources when changing the you wrote baud related
>> line into the driver file (temporary I will doing my local machine a quilt
>> patch for BRLTTY package the baud change related and recompile and reinstall
>> the packages).
> You can test without installing as you can run brltty right out of the build tree via the run-brltty script in its top-level directory. It takes exactly the same options as brltty itself.
>
>> This line change affects only with Focus 1 series models, other Freedom
>> Scientific displays is unaffected this change related if need final applying
>> this change the official code base?
> Yes, that'll be a problem but we can deal with it later if it turns out to be necessary.
>
>> So, a thing is absolute sure: general serial connection mode with general
>> serial port and general 9 pin serial cable is working, so the display is
>> usable,
> On that system, with direct serial support, please do the following command while brltty is running with the device:
>
>     stty -F /dev/ttyS0 -a
>
> The first line of that output will tell you what baud the device - ttyS0 - is currently set to.
>
>> If it happens that you don't have time to respond during the holidays, no
>> problem, I wish everyone who celebrates Christmas a happy holiday.
> Don't worry about that. Specific days that commemorate events don't matter to me. If some event matters to me then I'm in a permanent state when it comes to caring about it and don't need some special day to make it matter.
>
> When it comes to Christmas, by the way, the whole world seems to have its date, i.e. the date on which Jesus was born, completely wrong. A huge hint to this is that the Herod who had all the babies around Bethlehem killed who were less
> than two years old died in 4BC. This doesn't make the "Bible wrong, though, because it itself points to the year 7BC for when He was born. The chain of relevant events is as follows:
>
> Zechariah (John the baptizer's father) served in the temple during the course of Abijah, which was the 8th of 24 courses throughout the Hebrew year. In 8BC, the second half of the fourth Hebrew month was roughly the last two weeks of June. Elizabeth (John's mother), therefore, would've conceived in early July, i.e. shortly after Zechariah returned home from his temple duties.
>
> When Mary was told that Jesus would be conceived, we're also told that this was during the sixth month of Elizabeth's pregnancy. This brings us, therefore, pretty much to the end of 8BC.
>
> We then add a full-length pregnancy for Mary and we land near the start of October. When we look at the Hebrew calendar for 7BC we find that the Day of Atonement was October 2 (I think - memory could be wrong on this point). While the Bible dosn't explictly say that Jesus was born on the Day of Atonement, it's indeed a day that very accurately prefigures the event. It's the day on which the high priest would put off all of his glorious garments and put on simple clothing, which is exactly a figure of what Jesus actually did do by leaving Heaven and joining us here on this earth as, to all appearances, a fellow human being.
>
>> If my English is not completely good, don't be angry with me. :-):-)
> Now why would I be angry with someone just because his English isn't perfect? That just isn't the way I think. We all belong to the very same single race - the Human Race - as fellow citizens of this world.
>
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