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Groups > comp.arch.embedded > #29028 > unrolled thread
| Started by | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| First post | 2020-01-06 10:30 +0100 |
| Last post | 2020-01-07 10:18 +0100 |
| Articles | 5 — 1 participant |
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stty -F /dev/ttyUSB0 Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-01-06 10:30 +0100
Re: stty -F /dev/ttyUSB0 Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-01-06 13:33 +0100
Re: stty -F /dev/ttyUSB0 Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-01-06 14:13 +0100
Re: stty -F /dev/ttyUSB0 Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-01-07 09:08 +0100
Re: stty -F /dev/ttyUSB0 Johann Klammer <klammerj@NOSPAM.a1.net> - 2020-01-07 10:18 +0100
| From | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| Date | 2020-01-06 10:30 +0100 |
| Subject | stty -F /dev/ttyUSB0 |
| Message-ID | <quuuo7$mk6$1@gioia.aioe.org> |
stty -F /dev/ttyUSB0 speed 0 baud; line = 0; min = 1; time = 0; -brkint -icrnl -imaxbel -opost -isig -icanon -iexten -echo (something is wrong) stty -F /dev/ttyUSB0 ispeed 38400 stty: /dev/ttyUSB0: unable to perform all requested operations But if I give an obv wrong value it doesn't complain. stty -F /dev/ttyUSB0 ispeed 3840 The dongle is a FTDI Chip TTL-232R-5V USB to TTL Serial Cable(5.0V)-1.8m (2419945 at Farnell) On Linux kernel Version 3.14.15 I guess since the're the monopolist they don't have to produce working hardware anymore. And yes, I've read the crap about read write access on stackoverflow. I am in the plugdev group and it's read/writable for plugdev.
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| From | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| Date | 2020-01-06 13:33 +0100 |
| Message-ID | <quv9fg$8c1$1@gioia.aioe.org> |
| In reply to | #29028 |
Oh, and scoping the output shows that the actual rate is at least 1MBaud (the narrowest pulses are around 1uS wide.)
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| From | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| Date | 2020-01-06 14:13 +0100 |
| Message-ID | <quvbpd$n9o$1@gioia.aioe.org> |
| In reply to | #29031 |
On 01/06/2020 01:33 PM, Johann Klammer wrote: > Oh, and scoping the output shows that the actual rate is at least 1MBaud > (the narrowest pulses are around 1uS wide.) > > ok. seems it's not the actual number that matters, but the number of invocations. It's some internal state that changes. $ stty -F /dev/ttyUSB0 ispeed 38400 stty: /dev/ttyUSB0: unable to perform all requested operations $ stty -F /dev/ttyUSB0 ispeed 38400 (this one succeeds)
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| From | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| Date | 2020-01-07 09:08 +0100 |
| Message-ID | <qv1e9c$5rq$1@gioia.aioe.org> |
| In reply to | #29033 |
On 01/06/2020 02:13 PM, Johann Klammer wrote: > $ stty -F /dev/ttyUSB0 ispeed 38400 > stty: /dev/ttyUSB0: unable to perform all requested operations > $ stty -F /dev/ttyUSB0 ispeed 38400 > (this one succeeds) > > may have been a user error. $ stty -F /dev/ttyUSB0 38400 works at once. I did scope the output again and observed a tau of 23 uS. (=baud rate err of 0.11) Is this too much? Because I still can't get the uC to respond..
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| From | Johann Klammer <klammerj@NOSPAM.a1.net> |
|---|---|
| Date | 2020-01-07 10:18 +0100 |
| Message-ID | <qv1idp$nt9$1@gioia.aioe.org> |
| In reply to | #29054 |
On 01/07/2020 09:08 AM, Johann Klammer wrote: > > I did scope the output again and observed a tau of 23 uS. > (=baud rate err of 0.11) Is this too much? > Because I still can't get the uC to respond.. > > Nah user error again. is closer to 25uS...
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