Re: Multimeter USB output

2016-08-30 Thread Paul Rubin 
Larry Hudson  writes:
> Actually "Brain Dead Software" it was not!

Brain Damage Software, apparently: https://en.wikipedia.org/wiki/BDS_C
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Re: Multimeter USB output

2016-08-30 Thread Larry Hudson via Python-list 

On 08/29/2016 09:24 PM, Paul Rubin wrote:

Larry Hudson  writes:

with BDS-C under CP/M. Somebody remenbering this no-fp compiler from
the dark age before PC und Linux?

I remember it well.  It's what I used to initially learn C.


Source code is online here:

http://www.bdsoft.com/resources/bdsc.html


[...]

I remember reading a magazine interview with Leor Zolman (the author of BDS-C) where he 
mentioned what the BDS stood for...  He said is was his nickname in college:  Brain Dead.


Actually "Brain Dead Software" it was not!  It was really quite good, and rather widely used at 
the time.


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Re: Multimeter USB output

2016-08-30 Thread mm0fmf 

On 29/08/2016 09:54, Joe wrote:

Am 28.08.2016 um 17:22 schrieb Dennis Lee Bieber:

If you can read spaghetti coded C, you might want to study
https://sourceforge.net/projects/ut61/


Interesting, but... The last time I did something with c, it was with
BDS-C under CM/M. Somebody remenbering this no-fp compiler from the dark
age before PC und Linux?


Yes. It was a long time ago when I used BDS-C on initially Apple II + 
Microsoft CP/M card. Then on other Z80 CP/M systems. I also was 
introduced to the editor MINCE (Mince is not complete Emacs) which was 
compiled with BDS-C. 33 years ago and it seems like yesterday!

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Re: Multimeter USB output

2016-08-30 Thread Larry Hudson via Python-list 

On 08/30/2016 04:01 AM, D'Arcy J.M. Cain wrote:

On Mon, 29 Aug 2016 21:21:05 -0700
Larry Hudson via Python-list  wrote:

I remember it well.  It's what I used to initially learn C.  I'm a
completely self-taught, hobby programmer.  Been around since the MITS
Altair.  How many remember that beast??


Remember it and still have it in the basement.



Mine is stuffed into the back of a closet.   :-)

It was still working when I stored it, but I don't think I could remember how to bring it up 
again.  As I recall, you had to set the starting memory address via the front-panel switches — 
but the details have long since evaporated from my memory.   :-(


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Re: Multimeter USB output

2016-08-30 Thread Joe 

Am 30.08.2016 um 13:01 schrieb D'Arcy J.M. Cain:

On Mon, 29 Aug 2016 21:21:05 -0700
Larry Hudson via Python-list  wrote:

I remember it well.  It's what I used to initially learn C.  I'm a
completely self-taught, hobby programmer.  Been around since the MITS
Altair.  How many remember that beast??


Remember it and still have it in the basement.

I read a lot about the Altair in Byte in those days, but never had a 
chance to touch it. Wasn't it horrible expensive?

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Re: Multimeter USB output

2016-08-30 Thread D'Arcy J.M. Cain 
On Mon, 29 Aug 2016 21:21:05 -0700
Larry Hudson via Python-list  wrote:
> I remember it well.  It's what I used to initially learn C.  I'm a
> completely self-taught, hobby programmer.  Been around since the MITS
> Altair.  How many remember that beast??

Remember it and still have it in the basement.

-- 
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:da...@vex.net
VoIP: sip:da...@vex.net
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Re: Multimeter USB output

2016-08-30 Thread Joe 

Am 30.08.2016 um 06:24 schrieb Paul Rubin:

Larry Hudson  writes:

with BDS-C under CP/M. Somebody remenbering this no-fp compiler from
the dark age before PC und Linux?

I remember it well.  It's what I used to initially learn C.


Source code is online here:

http://www.bdsoft.com/resources/bdsc.html

I've looked at it a little.  I don't know if I ever might have had it in
me to write big chunks of asm code like that.  Wow!


Great surprise. Very interesting this link. Thank you, Paul.
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Re: Multimeter USB output

2016-08-29 Thread Paul Rubin 
Larry Hudson  writes:
>> with BDS-C under CP/M. Somebody remenbering this no-fp compiler from
>> the dark age before PC und Linux?
> I remember it well.  It's what I used to initially learn C.

Source code is online here:

http://www.bdsoft.com/resources/bdsc.html

I've looked at it a little.  I don't know if I ever might have had it in
me to write big chunks of asm code like that.  Wow!
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Re: Multimeter USB output

2016-08-29 Thread Larry Hudson via Python-list 

On 08/29/2016 01:54 AM, Joe wrote:
[snip...]

Interesting, but... The last time I did something with c, it was with BDS-C 
under CM/M. Somebody
remenbering this no-fp compiler from the dark age before PC und Linux?


I remember it well.  It's what I used to initially learn C.  I'm a completely self-taught, hobby 
programmer.  Been around since the MITS Altair.  How many remember that beast??


(And yes -- as you already corrected yourself -- that's CP/M not CM/M.)

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Re: Multimeter USB output

2016-08-29 Thread Rob Gaddi 
Joe wrote:

> The UT61B has two interfaces, a RS232C interface and this usb interface. 
> The RS232 interface works well with PySerial. It continously transmits 2 
> .. 3 Pakets per second with 14 Bytes each. This happens unsolicited 
> without any command as long as the RS232C/USB button on the DMM is active.
>

>From someone who does a LOT of code to talk to DMMs, scopes, counters,
etc?  Word of advice.  You're done.  Declare victory and move on.

You've got it working on one interface.  The other is even less well
documented and requires doing deep-down stuff against libusb because
there's no actual kernel driver, and you've got a Chinese manufacturer
of a low-end device being of little to no help so now you're trying to
reverse engineer the protocol from bad code without even the help of a
packet sniffer.  This is the sort of rabbit hole that weeks manage to
fall into with nothing to show for them.

If this is an exercise in learning to work with libusb then have at. 
But if what you actually need from this is to talk to the meter?  You're
talking to it already.  Take the win and walk.

-- 
Rob Gaddi, Highland Technology -- www.highlandtechnology.com
Email address domain is currently out of order.  See above to fix.
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Re: Multimeter USB output

2016-08-29 Thread Joe 

Am 29.08.2016 um 10:54 schrieb Joe:

it was with BDS-C under CM/M.


under CP/M, of course.
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Re: Multimeter USB output

2016-08-29 Thread Joe 

Am 28.08.2016 um 17:22 schrieb Dennis Lee Bieber:

If you can read spaghetti coded C, you might want to study
https://sourceforge.net/projects/ut61/


Interesting, but... The last time I did something with c, it was with 
BDS-C under CM/M. Somebody remenbering this no-fp compiler from the dark 
age before PC und Linux?

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Re: Multimeter USB output

2016-08-28 Thread Terry Reedy 

On 8/28/2016 5:13 AM, Joe wrote:


Am 28.08.2016 um 00:45 schrieb Terry Reedy:

On 8/27/2016 3:35 PM, Joe wrote:

Hi,

I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read
the USB output of a DMM 'UT61B'.

import usb.core
import usb.util
import usb.backend.libusb1

def Gosub():
 dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital
Multimeter UT61B
 if dev == None:
 print ('Multimeter not found')
 else:
 print ('Multimeter was found')
 dev.set_configuration()
 cfg = dev.get_active_configuration()
 intf = cfg[(0,0)]
 ep = usb.util.find_descriptor(
 intf,
 custom_match = \
 lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)
 if ep == None:
 print ('ep is None')
 else:
 s = ep.read(64, 500)
 print ('Len s: ' + len(s))

print ('Starting')
Gosub()
print ('Ready.-')

Result:


I presume you saw
Starting
Multimeter was found


File "d:\work-d\PythonProgs\ut61b.py", line 27, in 
   Gosub()
File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
   s = ep.read(64, 500)
File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
   return self.device.read(self, size_or_buffer, timeout)
File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
   self.__get_timeout(timeout))
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in
intr_read
   timeout)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in
__read
   _check(retval)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in
_check
   raise USBError(_strerror(ret), ret, _libusb_errno[ret])

usb.core.USBError: [Errno 10060] Operation timed out

What's wrong? How to fix?


Read (again?) the doc for the interface for the device.  Because reading
timed out, I suspect that it is waiting for a command for it to send
something.



Yes, I saw this:

Starting
Multimeter was found

The UT61B has two interfaces, a RS232C interface and this usb interface.
The RS232 interface works well with PySerial. It continously transmits 2
.. 3 Pakets per second with 14 Bytes each. This happens unsolicited
without any command as long as the RS232C/USB button on the DMM is active.

So I assumed the USB interface also doesn't need any command and also
transmit this stream of 2 to 3 Pakets per second. But unfortunately I
don't have any doc for the USB interface for this device.

To the accompanying software of the UT61B there is a ready windos app
which shows and logs the output of the UT61B. This app can be switched
between RS232C and USB; both work.

I asked the manufacturer (Uni-T in Shenzen) for additional info and are
now waiting for an answer.

Assumed the USB interface sends this 2 to 3 pakets per second
unsolicited - should the code shown work? Is this ok:



 lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)


I am in doubt: Is usb.util.ENDPOINT_IN really correct?


I do not know as I have not used the usb package.

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Multimeter USB output

2016-08-28 Thread Joe 


Am 28.08.2016 um 00:45 schrieb Terry Reedy:
> On 8/27/2016 3:35 PM, Joe wrote:
>> Hi,
>>
>> I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read
>> the USB output of a DMM 'UT61B'.
>>
>> import usb.core
>> import usb.util
>> import usb.backend.libusb1
>>
>> def Gosub():
>>  dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital
>> Multimeter UT61B
>>  if dev == None:
>>  print ('Multimeter not found')
>>  else:
>>  print ('Multimeter was found')
>>  dev.set_configuration()
>>  cfg = dev.get_active_configuration()
>>  intf = cfg[(0,0)]
>>  ep = usb.util.find_descriptor(
>>  intf,
>>  custom_match = \
>>  lambda e: \
>> usb.util.endpoint_direction(e.bEndpointAddress) == \
>> usb.util.ENDPOINT_IN)
>>  if ep == None:
>>  print ('ep is None')
>>  else:
>>  s = ep.read(64, 500)
>>  print ('Len s: ' + len(s))
>>
>> print ('Starting')
>> Gosub()
>> print ('Ready.-')
>>
>> Result:
>
> I presume you saw
> Starting
> Multimeter was found
>
>> File "d:\work-d\PythonProgs\ut61b.py", line 27, in 
>>Gosub()
>> File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
>>s = ep.read(64, 500)
>> File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
>>return self.device.read(self, size_or_buffer, timeout)
>> File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
>>self.__get_timeout(timeout))
>> File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in
>> intr_read
>>timeout)
>> File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in
>> __read
>>_check(retval)
>> File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in
>> _check
>>raise USBError(_strerror(ret), ret, _libusb_errno[ret])
>>
>> usb.core.USBError: [Errno 10060] Operation timed out
>>
>> What's wrong? How to fix?
>
> Read (again?) the doc for the interface for the device.  Because reading
> timed out, I suspect that it is waiting for a command for it to send
> something.
>

Yes, I saw this:

Starting
Multimeter was found

The UT61B has two interfaces, a RS232C interface and this usb interface. 
The RS232 interface works well with PySerial. It continously transmits 2 
.. 3 Pakets per second with 14 Bytes each. This happens unsolicited 
without any command as long as the RS232C/USB button on the DMM is active.


So I assumed the USB interface also doesn't need any command and also
transmit this stream of 2 to 3 Pakets per second. But unfortunately I 
don't have any doc for the USB interface for this device.


To the accompanying software of the UT61B there is a ready windos app 
which shows and logs the output of the UT61B. This app can be switched 
between RS232C and USB; both work.


I asked the manufacturer (Uni-T in Shenzen) for additional info and are 
now waiting for an answer.


Assumed the USB interface sends this 2 to 3 pakets per second 
unsolicited - should the code shown work? Is this ok:



>>  lambda e: \
>> usb.util.endpoint_direction(e.bEndpointAddress) == \
>> usb.util.ENDPOINT_IN)

I am in doubt: Is usb.util.ENDPOINT_IN really correct?

Thanx - Joe
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Re: Multimeter USB output

2016-08-27 Thread Terry Reedy 

On 8/27/2016 3:35 PM, Joe wrote:

Hi,

I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read
the USB output of a DMM 'UT61B'.

import usb.core
import usb.util
import usb.backend.libusb1

def Gosub():
 dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital
Multimeter UT61B
 if dev == None:
 print ('Multimeter not found')
 else:
 print ('Multimeter was found')
 dev.set_configuration()
 cfg = dev.get_active_configuration()
 intf = cfg[(0,0)]
 ep = usb.util.find_descriptor(
 intf,
 custom_match = \
 lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)
 if ep == None:
 print ('ep is None')
 else:
 s = ep.read(64, 500)
 print ('Len s: ' + len(s))

print ('Starting')
Gosub()
print ('Ready.-')

Result:


I presume you saw
Starting
Multimeter was found


File "d:\work-d\PythonProgs\ut61b.py", line 27, in 
   Gosub()
File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
   s = ep.read(64, 500)
File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
   return self.device.read(self, size_or_buffer, timeout)
File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
   self.__get_timeout(timeout))
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in
intr_read
   timeout)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in
__read
   _check(retval)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in
_check
   raise USBError(_strerror(ret), ret, _libusb_errno[ret])

usb.core.USBError: [Errno 10060] Operation timed out

What's wrong? How to fix?


Read (again?) the doc for the interface for the device.  Because reading 
timed out, I suspect that it is waiting for a command for it to send 
something.


--
Terry Jan Reedy

--
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Multimeter USB output

2016-08-27 Thread Joe 

Hi,

I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read 
the USB output of a DMM 'UT61B'.


import usb.core
import usb.util
import usb.backend.libusb1

def Gosub():
 dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital 
Multimeter UT61B

 if dev == None:
 print ('Multimeter not found')
 else:
 print ('Multimeter was found')
 dev.set_configuration()
 cfg = dev.get_active_configuration()
 intf = cfg[(0,0)]
 ep = usb.util.find_descriptor(
 intf,
 custom_match = \
 lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)
 if ep == None:
 print ('ep is None')
 else:
 s = ep.read(64, 500)
 print ('Len s: ' + len(s))

print ('Starting')
Gosub()
print ('Ready.-')

Result:

File "d:\work-d\PythonProgs\ut61b.py", line 27, in 
   Gosub()
File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
   s = ep.read(64, 500)
File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
   return self.device.read(self, size_or_buffer, timeout)
File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
   self.__get_timeout(timeout))
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in 
intr_read

   timeout)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in 
__read

   _check(retval)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in 
_check

   raise USBError(_strerror(ret), ret, _libusb_errno[ret])

usb.core.USBError: [Errno 10060] Operation timed out

What's wrong? How to fix?

Regards -- Joe
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