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

[Hammer Attila]

Hi Dave,

Well, me not have good news, or this usb to serial adapter it just 
doesn't want to automatically operate correctly at 57600 baud, as the 
Focus 1 display would expect.

The attached zip file contains two type brltty_usb_serial beginning log 
files:

1. The brltty_usb_serial.log file I started general logging brltty 
command in 2024-12-29@16:14:04.914.

I used following command:

LANG=C brltty -ldebug,usb,serial,inpkts,outpkts -b fs -d /dev/ttyACM0 -L 
brltty_usb_serial.log

I waiting between 16:14:04.914 and 16:21:00.748, and because not 
happened anything (braille display is not initialized), I doed the usual 
manual stty -F /dev/ttyACM0 57600 command to initailize the usb to 
serial adapter with 57600 and the braille display.

Braille display driver begin starting again with in 16:21:05.434, and 
the display is detected in 2024-12-29@16:21:05.497.

16:14:05 the serial baud measure scrypt shows following values:

Start time when measure begin: 16:14:05
16:14:05: 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

16:14:15: 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

16:14:25: 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

16:14:35: 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

16:14:45: 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

16:14:55: 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

End time when measure ended: 16:15:05


After manual baud command change, 16:21:05 the measure scrypt shows 
following values:

Start time when measure begin: 16:21:05
16:21:05: 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

16:21:15: 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

16:21:25: 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

16:21:35: 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

16:21:45: 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

16:21:55: 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

End time when measure ended: 16:22:05


After this, I tryed following command with you suggested in 16:33 
beginning time (the log file name is brltty_usb_serial16:33.log).

Used command:

LANG=C brltty -ldebug,usb,serial,inpkts,outpkts -b fs -d

serial:ttyACM0+baud=57600

 -L brltty_usb_serial_16:33.log

In 16:33:05 start time the serial measure scrypt shows the 9600 baud 
related settings in adapter side.

I started brltty related modified command with following time period:

16:33:04.687

I waiting until 16:38:10.514, and after this, because the display is not 
initialized, and adapter side the serial baud rate is not changed, I 
doed the stty -F /dev/ttyACM0 57600 manual baud rate command.

The braille driver begin starting again with 2024-12-29@16:38:15.203, 
the display is detected in 2024-12-29@16:38:15.266 based the log file write.

Unfortunatelly I broke the second 16:39 serial measure related command 
(I want doed the serial baud measure after the manual serial port baud 
rate, but unfortunatelly forgot type the measure number type parameter 
typing).

So, independent applied the suggested patch or not, or I use the general 
BRLTTY logging related command or the modified baud rate speed change 
completed command, this usb to serial adapter my focus display works 
when I doing a manual baud rate command to 57600 baud.

Possible different usb to serial adapters works different, this noname 
usb to serial adapter works this way.


If need testing other type command or other modified patch, please you 
tell and I will be doing this welcome.

Now I not tried the usb cable the test with my Debian 12 box (the native 
usb connection mode related test), if I understand right the patch 
purpose, this patch affects only the serial connection mode.

If need testing again the usb connection mode with a native usb cable, I 
will be doing the test welcome.


Attila

2024. 12. 29. 14:51 keltezéssel, Dave Mielke írta:
[quoted lines by Hammer Attila on 2024/12/29 at 14:36 +0100]

When I test the attached patch, I what command use?

Or, the following general command?

LANG=C brltty -ldebug,usb,serial,inpkts,outpkts -b fs -d /dev/ttyACM0 -L
brltty_usb_serialdongle_log.log
This one. In other words, don't hard-code the baud parameter in the device 
option.

I hammered a little measure script in Python with automatically measure four
time with USB serial adapter baud rate.

Only me need doing the file store related few code lines.
Yes, it's always convenient to code whatever you end up wanting to do over and 
over again.
<<attachment: brltty_latest_test_logs.zip>>
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