[time-nuts] GPScon running on Raspberry Pi 3b

[Mark Sims]

No, it's not a bug.  It's the way it is intended to work.  Whenever Heather 
sees a command to open/change the serial port, the currently open port (if any) 
is closed and the new one is opened.   

Heather lets you change the serial port or read a config file on the fly from 
the keyboard.   Trying to filter when to ignore or delay opening the port is a 
needless and potentially error prone complication.   The simple / robust / 
reliable thing to do is just try and open it whenever / wherever a serial port 
command is seen.  

Most people with just set up the config file for their default port and never 
use the command line option or do things like changing the port or loading a 
config file from the keyboard,  but it can be quite handy if you are playing 
with lots of devices.

-

> So the bug reported below seems to be a bug.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Hal Murray]

andrew.mile...@gmail.com said:
> Beware that USB-to-Serial converters are pretty horrible for precise timing
> applications, like PPS on the CD pin.  It can be done on a GPIO pin instead,
> but requires some hacking and re-compiling. 

What sort of hacking or re-compiling do you have in mind?

I didn't have any troubles getting PPS via GPIO.  It's a bit of editing on 
run-time config files.  From my notes:
in /boot/config.txt
add new line: dtoverlay=pps-gpio,gpiopin=4
(The pin number depends on the GPS HAT.)
In /etc/modules
add new line: pps-gpio



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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Andrew E Mileski]

On Mon, Jun 26, 2017 at 2:04 PM, Andrew E Mileski 
wrote:

>
> The RaspberryPi 3 is a bit different.
>
> All the Pi models, 1 & 2 & 3, have two UARTs:  a full-featured UART, and a
> mini-UART.
>
> On the PI 3, the header pins for the serial port are routed by default to
> the mini-UART, and the full-featured UART is used for Bluetooth.  On the
> older Pi models, the full-featured UART is routed to the header,
>
> It is possible to swap them back via software, but then you lose Bluetooth
> functionality.
>
> The mini-UART has issues with its baud-rate generator:  it is derived from
> the system clock, not an independent clock generator like the full-featured
> UART, so it doesn't work when dynamic system clocking for power management
> is enabled, so you either have to run at max or minimum speed only.
>
> FWIW, I'm running a custom Fedora 25 on all my Pi3, as the default doesn't
> support all Pi3 devices (and I don't want the U-Boot boot-loader either).
> I'm using cheap $0.99 USD CH340 based USB-to-Serial converters from E-Bay
> (I bought 10), as well as my bench equipment which are mostly FTDI (hacked
> some to use standard VendorId and DeviceId) or PL.
>
> Beware that USB-to-Serial converters are pretty horrible for precise
> timing applications, like PPS on the CD pin.  It can be done on a GPIO pin
> instead, but requires some hacking and re-compiling.
>

I should have cited my sources:  most details can be found on the RPi
Foundation's web site at:

https://www.raspberrypi.org/documentation/configuration/uart.md

Google:  raspberry pi mini-uart
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Chris Albertson]

On Sun, Jun 25, 2017 at 3:04 PM, Mark Sims  wrote:

> Heather's configuration priority is to process:  hard coded defaults,
> then the config file,  and finally the command line options.  This lets you
> set your preferred settings in the config file and then override your
> config file options from the command line.
>


If that is the desired behavior and I think it is reasonable and what most
people would expect,  then the correct implementation of that behavior is
to NOT ACT on any config setting until the command line options are read.
Or in general never act on an instruction that might be overridden

So the bug reported below seems to be a bug.


>
> 
>
> > When I ran it with ./heather -4u, it first told me that it was unable to
> open /dev/ttyUSB0 and
> then told me it was unable to open /dev/ttyUSB3. This is probably due to
> the
> configuration file containing "-1u", but if that option is given on the
> command line then the configuration file value should be ignored - or at
> the
> least it should be tried after the command line option.
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>



-- 

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Redondo Beach, California
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Andrew E Mileski]

On Fri, Jun 23, 2017 at 12:16 AM, Hal Murray 
wrote:

>
> hol...@hotmail.com said:
> > The PI does have a couple of logic level serial ports on the expansion
> > connector you can connect a level shifter two.  One port is normally the
> > Linux serial console which you can configure to be a general purpose
> serial
> > port (I've never used them, but others have).
>
> The console port used by the GPS HATs.  Works fine.  /dev/ttyAMA0
>
> The PPS pin varies depending on which type of HAT you get.
>

The RaspberryPi 3 is a bit different.

All the Pi models, 1 & 2 & 3, have two UARTs:  a full-featured UART, and a
mini-UART.

On the PI 3, the header pins for the serial port are routed by default to
the mini-UART, and the full-featured UART is used for Bluetooth.  On the
older Pi models, the full-featured UART is routed to the header,

It is possible to swap them back via software, but then you lose Bluetooth
functionality.

The mini-UART has issues with its baud-rate generator:  it is derived from
the system clock, not an independent clock generator like the full-featured
UART, so it doesn't work when dynamic system clocking for power management
is enabled, so you either have to run at max or minimum speed only.

FWIW, I'm running a custom Fedora 25 on all my Pi3, as the default doesn't
support all Pi3 devices (and I don't want the U-Boot boot-loader either).
I'm using cheap $0.99 USD CH340 based USB-to-Serial converters from E-Bay
(I bought 10), as well as my bench equipment which are mostly FTDI (hacked
some to use standard VendorId and DeviceId) or PL.

Beware that USB-to-Serial converters are pretty horrible for precise timing
applications, like PPS on the CD pin.  It can be done on a GPIO pin
instead, but requires some hacking and re-compiling.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Mark,

That is exactly the right processing order. However, it shouldn't actually try
the USB port until after that processing is done. In other words, if the
configuration file has -1u and the command line has -4u, it should never try
USB0 because that was overridden on the command line. It should try USB3 and
succeed or fail based on that.

Did you get what you needed from the build this morning?


Michael Lee Finney

> Heather's configuration priority is to process:  hard coded defaults,  then
> the config file,  and finally the command line options.  This lets you set
> your preferred settings in the config file and then override your config file 
> options from the command line.

> 

>> When I ran it with ./heather -4u, it first told me that it was unable to 
>> open /dev/ttyUSB0 and
> then told me it was unable to open /dev/ttyUSB3. This is probably due to the
> configuration file containing "-1u", but if that option is given on the
> command line then the configuration file value should be ignored - or at the
> least it should be tried after the command line option.
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 Timenutmailto:time...@metachaos.net

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[time-nuts] GPScon running on Raspberry Pi 3b

[Mark Sims]

Heather's configuration priority is to process:  hard coded defaults,  then the 
config file,  and finally the command line options.  This lets you set your 
preferred settings in the config file and then override your config file 
options from the command line. 



> When I ran it with ./heather -4u, it first told me that it was unable to open 
> /dev/ttyUSB0 and
then told me it was unable to open /dev/ttyUSB3. This is probably due to the
configuration file containing "-1u", but if that option is given on the
command line then the configuration file value should be ignored - or at the
least it should be tried after the command line option.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Adrian Godwin]

On Fri, Jun 23, 2017 at 1:36 AM, Mark Sims  wrote:

>
> I also have some CH3xx dongles that have some clone chips in them.  Many
> Linux drivers don't seem to be able to set the baud rate on those.
>
>
I looked into this when I was struggling with a CH3xx interface recently.
It appears to be OK if you have a 4.0 or higher kernel. Unfortunately this
doesn't include what was until recently the current Debian distribution,
jessie. However, the version released a few days ago (stretch) should be OK.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Mark,

I compiled and ran Lady Heather on my Tinker this morning. This is using the
"stretch" distribution with GCC version 6.3.0 (and of course, the current
version is 7.1.0 with more language changes). I received 8 warning messages,
the first three are a language change and remainder are "misleading
indentation" messages. To get a clean compile, I fixed the spaces and
indentation, but looking at the code it is the type of thing that I would
check to make sure that the control flow is correct - the indentation is
indeed misleading which is always a potential sign of a bug. Here are the
warning messages that I got:

   heather.cpp:13720:10: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:13720:27: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:13720:40: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:10881:26: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heather.cpp:10883:4: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathmsc.cpp:2124:28: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathmsc.cpp:6710:24: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathgps.cpp:20433:7: warning: this ‘if’ clause does not guard... 
[-Wmisleading-indentation]

Also, I am waiting for my USB to RS232 adapter, so I don't have anything
plugged into the USB ports (other than keyboard and mouse). When I ran it with
./heather -4u, it first told me that it was unable to open /dev/ttyUSB0 and
then told me it was unable to open /dev/ttyUSB3. This is probably due to the
configuration file containing "-1u", but if that option is given on the
command line then the configuration file value should be ignored - or at the
least it should be tried after the command line option.

Other than the above, it looks great given that nothing is plugged in!

Thanks for the work you do maintaining this program.


Michael

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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Chris Albertson]

I've got a Pi3 here on my desk.   I only see one UART that connects to GPIO
pins.   But it turns out if you actually need to use serial you use the USB
to serial dongles.  If you need four serial ports use four dongles.   That
is just the way the Pi3 is.

You can level the 3.3 volt serial port but then you are into a MAX chip and
some passives or maybe just a couple transistors but the =USB-Serial dingle
is easier then level shifting.

If you want a Pi-like device that is better for real-time embedded use look
at the Beagle Bone Black.  But it was limited CPU and RAM compared to Pi3
but better IO.

If you are building a NTP server, look at the Pi Zero version 1.3.  $5 each.



On Thu, Jun 22, 2017 at 7:51 PM, Orin Eman  wrote:

> On Thu, Jun 22, 2017 at 5:36 PM, Mark Sims  wrote:
>
> >
> > The PI does have a couple of logic level serial ports on the expansion
> > connector you can connect a level shifter two.  One port is normally the
> > Linux serial console which you can configure to be a general purpose

-- 

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Hal Murray]

hol...@hotmail.com said:
> The PI does have a couple of logic level serial ports on the expansion
> connector you can connect a level shifter two.  One port is normally the
> Linux serial console which you can configure to be a general purpose serial
> port (I've never used them, but others have). 

The console port used by the GPS HATs.  Works fine.  /dev/ttyAMA0

The PPS pin varies depending on which type of HAT you get.


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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Orin Eman]

On Thu, Jun 22, 2017 at 5:36 PM, Mark Sims  wrote:

>
> The PI does have a couple of logic level serial ports on the expansion
> connector you can connect a level shifter two.  One port is normally the
> Linux serial console which you can configure to be a general purpose serial
> port (I've never used them, but others have).
>


Oh, that's fun on the Pi, especially the Pi3.  Here are my notes on the Pi3
from a different project.  If you're really lucky, they didn't change it
again.

QUOTE:

Well, they just couldn't make it backward compatible out of the box...

By default, ttyAMA0 is used for Bluetooth so there are more hoops to jump
through to wrest it away from the OS's grasp.  ttyS0 is now wired to the IO
pins which we could use if it worked correctly, but apparently its baud
rate depends on the cpu core frequency which is _variable_*.  Fortunately
there is a way of routing ttyAMA0 to the IO pins

As before, all references to ttyAMA0 need removing from /boot/cmdline.txt.

To disable bluetooth:

systemctl disable hciuart
Add "dtoverlay=pi3-disable-bt" to /boot/config.txt

Finally, perhaps unnecessary, use raspi-config to disable login on the
serial port.  (Serial under Advanced Options.)

* https://frillip.com/raspberry-pi-3-uart-baud-rate-workaround/
https://www.raspberrypi.org/forums/viewtopic.php?f=107=138223
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[time-nuts] GPScon running on Raspberry Pi 3b

[Mark Sims]

Heather only requires TXD, RXD, and GND.   If you want to use the temperature 
control feature RTS and DTR.

Most Linux distros have decent USB serial port drivers built in.  I tend to use 
no-name Chinese PL-2303 based USB dongles... because I have them.   They have 
worked fine on all the Linuxy stuff I have used and the Windows drivers they 
shipped with work.

I no longer use FTDI based devices since there are LOTS of clone chips out 
there and FTDI is rather aggressive about having their (Windows) drivers not 
work with them.  Since there is no way to tell what chip is actually being used 
in a dongle, I just avoid the FTDI stuff and any potential hassles.  There are 
also fake Prolific chips out there and Prolific has also been known to block 
their Windows drivers from working with them.  If you can find genuine FTDI / 
Prolific chip based dongles, they are great... but buyer beware these days.

I also have some CH3xx dongles that have some clone chips in them.  Many Linux 
drivers don't seem to be able to set the baud rate on those.

Something recently changed on one of my Win XP boxes (perhaps installing the 
TL-833 prom burner software) and some of my PL-2303 dongles have started acting 
up.  After a day or two of continuous operation they start randomly dropping 
received bytes.  No issues running the same dongles on PI / Linux / macOS or 
previously on that XP system.  

The garbaged received data did help my find a bug in Heather...  they could 
produce numbers like 1.2345E300.   Heather was expecting a number like 9.8765 
and tried to format and print the value.  The resulting 300 character string 
overflowed a buffer and crashed the program.   Now my number reader routines do 
a sanity check and reject obviously bogus values, NANs, INFs, etc.

The PI does have a couple of logic level serial ports on the expansion 
connector you can connect a level shifter two.  One port is normally the Linux 
serial console which you can configure to be a general purpose serial port 
(I've never used them, but others have).

---

> Are there any special requirements for using a USB to RS-232 adapter on the
Pi? Any specific features for the RS-232 adapter to get all of the features
for Lady Heather?
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Mark,

Are there any special requirements for using a USB to RS-232 adapter on the
Pi? Any specific features for the RS-232 adapter to get all of the features
for Lady Heather? Looking at eBay, it is not clear which adapter would be
best. Some don't say anything about supported pins, other list the pins that
are supported (and may differ). Which pins do you require / support? Are any
device drivers needed for the Pi or Linux for those adapters?

New to Linux, Pi and Lady Heather.

Thanks.

Michael

> Lady Heather can run under Linux, macOS,  FreeBSD, and Windoze.   It runs
> well on the PI (2 or 3) and the soon to be released version 6 has support
> for the touchscreen and several new devices.   I can send anybody interested
> in testing the new version the latest source code to build.  Contact me off 
> list.

> New devices include the RFTG-m,  Truepostion GPSDO,  Zyfer Nanosync 380, 
> Brandywine GPS4, Jackson Labs LTE-lite,  Oscilloquartz Star-4,  NEC GPSDO, 
> Trimble TAIP receivers, most SCPI GPSDOs (Z38xx, HP-5),  HP-5071A,  TAPR
> TICC,  HP-531xx counters,  generic time/frequency counters,  etc

> --

>> I believe that having a native GPS monitoring software on a Raspberry Pi 
>> instead of PC would become a game changer.
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-- 
Best regards,
 Timenutmailto:time...@metachaos.net

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[time-nuts] GPScon running on Raspberry Pi 3b

[Mark Sims]

Lady Heather can run under Linux, macOS,  FreeBSD, and Windoze.   It runs well 
on the PI (2 or 3) and the soon to be released version 6 has support for the 
touchscreen and several new devices.   I can send anybody interested in testing 
the new version the latest source code to build.  Contact me off list.

New devices include the RFTG-m,  Truepostion GPSDO,  Zyfer Nanosync 380,  
Brandywine GPS4, Jackson Labs LTE-lite,  Oscilloquartz Star-4,  NEC GPSDO,  
Trimble TAIP receivers, most SCPI GPSDOs (Z38xx, HP-5),  HP-5071A,  TAPR 
TICC,  HP-531xx counters,  generic time/frequency counters,  etc

--

> I believe that having a native GPS monitoring software on a Raspberry Pi 
> instead of PC would become a game changer.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Chris Albertson]

it looks to me like Olgierdhas a working INTEL linux
os running on the Pi3.   He installed Wine on the Intel Linux not on
the ARM Linux

It looks like maybe Michael has an ARM version of linux running native
on the Pi3  Wine will not run on that
If you need to run Wine, you need to fist  have an INTEL lInux
running.   Remember "WINE= Wine Is Not an Emulaor" and it will not
run Intel binaries on Arm.

I'm skeptical it would be more then a stunt a triple stack of virtual
environments.  But if the final Windows app is not really doing
anything with the CPU, maybe fast enough.
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Olgierd Dudko]

Hi Michel,
I installed Wine (Windows compatibility layer) within the ExaGear.
After the installation of the ExaGear on a Raspberry Pi one gets a new icon on 
the desktop that just starts a session of Debian-8. Trying command "$ arch" 
returns "i686" beauty!
What I did (within this Debian session) was:
$ sudo apt-get update
$ sudo apt-get upgrade (- this returned couple of warnings/errors mainly in the 
area of certificates updating - nothing critical I suppose)
And just $ sudo apt-get install wine ...did the trick.

Try then:
$ wine --version 
$ wine start
For the first time, Wine dowloaded itself some extra .Net emulation as well as 
Internet Explorer (Gecko) module. 

One needs also to create a sybolic link in ~/.wine/dosdevices to enable the 
serial port for Windows (assuming e.g. the FTDI driver recognised it on the 
Raspbian level):
$ ln -s /dev/ttyUSB0 ~/.wine/dosdevices/com1

Note ExaGear offers three day trial for free. Let me add a quote from an 
Eltechs email:
"The best way to get the trial is to install it directly from Raspberry Pi 
repository. For that, you have to open the command line and input two simple 
commands: 

sudo apt-get update 

sudo apt-get install exagear-desktop 

After the installation you need to run 'exagear' command and fill in the pop-up 
form to get trial license key."

I believe that having a native GPS monitoring software on a Raspberry Pi 
instead of PC would become a game changer. My GPScon has been working 
flawlessly for few days now.
Good luck!

Olgierd

Dnia 20.06.2017 o godz. 14:34 time...@metachaos.net napisał(a):

> Neat!
> 
> I just happen to be playing with a Pi this week as a class assignment
> (retirement is wonderful - finally going back to college).
> 
> I downloaded Lady Heather, compiled it, and got it to come up and run. Nothing
> that I can plug in this week though, but it looks good. I also installed QEMU
> in user mode which is similar to ExaGear, but slower and free (long run I will
> probably get an ASUS Tinker as my lab computer, and it is a different 
> ExaGear).
> 
> However, I could not find the steps to download wine. I understand that some
> sort of patch is required, but all that I could find was complete linux images
> that were already patched. What were your steps to download and install wine?
> 
> Michael
> 
>> Hi,
>> This is my first post to the community I learned so much from. Just wanted
>> to share -- I managed to succesfully install today the GPScon windows
>> application on a micro computer Raspberry Pi 3 model B. CPU utilisation is 
>> 2% - a perfect overall result.
>> I used an FTDI RS232 USB dongle to connect Z3805A/58503B to the Pi. First I
>> installed on the Pi a Russian commercial I686 emulation software called
>> ExaGear Desktop by Eltechs.com ($30). It provides a Debian-8 Intel
>> environment on the Arm CPU. Next move was to (sudo apt-get) install wine
>> Windows XP emulator and symlink therein com1 as /dev/ttyUSB0 - to enable the
>> usb dongle to be seen by Wine as com1.
>> Then I installed my copy of GPScon from 2013, which turned out to work 
>> pretty well.
>> Hope this post was usefull. In case of interest I would exact steps to make 
>> this working.
> 
>> Best regards
>> Olgierd
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> 
> 
> 
> -- 
> Best regards,
> Timenutmailto:time...@metachaos.net
> 
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Neat!

I just happen to be playing with a Pi this week as a class assignment
(retirement is wonderful - finally going back to college).

I downloaded Lady Heather, compiled it, and got it to come up and run. Nothing
that I can plug in this week though, but it looks good. I also installed QEMU
in user mode which is similar to ExaGear, but slower and free (long run I will
probably get an ASUS Tinker as my lab computer, and it is a different ExaGear).

However, I could not find the steps to download wine. I understand that some
sort of patch is required, but all that I could find was complete linux images
that were already patched. What were your steps to download and install wine?

Michael

> Hi,
> This is my first post to the community I learned so much from. Just wanted
> to share -- I managed to succesfully install today the GPScon windows
> application on a micro computer Raspberry Pi 3 model B. CPU utilisation is 2% 
> - a perfect overall result.
> I used an FTDI RS232 USB dongle to connect Z3805A/58503B to the Pi. First I
> installed on the Pi a Russian commercial I686 emulation software called
> ExaGear Desktop by Eltechs.com ($30). It provides a Debian-8 Intel
> environment on the Arm CPU. Next move was to (sudo apt-get) install wine
> Windows XP emulator and symlink therein com1 as /dev/ttyUSB0 - to enable the
> usb dongle to be seen by Wine as com1.
> Then I installed my copy of GPScon from 2013, which turned out to work pretty 
> well.
> Hope this post was usefull. In case of interest I would exact steps to make 
> this working.

> Best regards
> Olgierd
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-- 
Best regards,
 Timenutmailto:time...@metachaos.net

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[time-nuts] GPScon running on Raspberry Pi 3b

[Olgierd Dudko]

Hi,
This is my first post to the community I learned so much from. Just wanted to 
share -- I managed to succesfully install today the GPScon windows application 
on a micro computer Raspberry Pi 3 model B. CPU utilisation is 2% - a perfect 
overall result.
I used an FTDI RS232 USB dongle to connect Z3805A/58503B to the Pi. First I 
installed on the Pi a Russian commercial I686 emulation software called ExaGear 
Desktop by Eltechs.com ($30). It provides a Debian-8 Intel environment on the 
Arm CPU. Next move was to (sudo apt-get) install wine Windows XP emulator and 
symlink therein com1 as /dev/ttyUSB0 - to enable the usb dongle to be seen by 
Wine as com1.
Then I installed my copy of GPScon from 2013, which turned out to work pretty 
well.
Hope this post was usefull. In case of interest I would exact steps to make 
this working.

Best regards
Olgierd
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