any example for avr32? or other atmel?
2011/11/30 Ziggy <[email protected]>
> Depends on the platform. If you have ioctl, it's something like:
> int ioctl(fd, TCSBRK, int arg);
>
> POSIX form should have a specific function, tcsendbreak:
> int tcsendbreak(fd, int arg);
>
> You'll have to check your library to see the specifics, but the ioctl form
> with and argument of 0 is usually 250-350ms.
> tcsendbreak argument may be in units of 100ms, I don't recall for sure.
> But that's also OS dependent. OSX ignores the value and does 400ms.
> Everybody does their own thing :)
>
> If you are working on a micro, then it's going to be different. Depends on
> how serial support is implemented. You just have to drive the output low
> long enough. It will be different if bit bang or UART, etc. As example, for
> AVR32, Atmel has specific break generation functions in the USART library
> making it pretty simple.
>
>
> On Nov 29, 2011, at 8:32 PM, Roberto Spadim wrote:
>
> yes, i´m reading it :)
> only IAC BREAK is interesting, and IAC IAC (0xff character to serial),
> others isn´t
> but... could owserver run only with 9600 bauds? it don´t need to change
> baud rate?
> it only change baud rate for reset? when it need to reset?
>
> how it send reset via serial?
> put(fp,break_character); ????
> or
> ioctl(fp, BREAK); ???
> i never sent a break via serial
>
> 2011/11/29 Ziggy <[email protected]>
>
>> Does it need to be that complex? Do you really need anything other than
>> IAC BREAK? I don't believe so. Only if you wish to run the DS2480 at higher
>> than 9600 bps, which is optional. In fact, the data sheet shows that a
>> number of functions are not supported at higher data rates anyway.
>>
>> On Nov 29, 2011, at 5:11 PM, Roberto Spadim wrote:
>>
>> yeah
>> what i´m telling is....
>> udp with rfc2217
>> we can change baud rate via character 0xff (IAC)
>> and all others characters go via udp protocol :)
>> just change the owserver to open a udp instead of tcp
>> and it will never close connection, in other works, we will never know if
>> other side is online, like a serial line... but we can´t know if host is up
>> or not... (for me no problems)
>>
>> 2011/11/29 Ziggy <[email protected]>
>>
>>> After looking at this a little more closely, I don't think it will
>>> work. What I mentioned earlier is not enough to force a 'start polarity in
>>> place of the stop bit'. The UDP/serial converter is not going to be capable
>>> of changing it's character format so it will still be sending 8 bit data
>>> with a valid stop bit to the DS2480 no matter what we do. Apologies for the
>>> confusion, but I'll keep thinking about this. It would be nice to have a
>>> streamlined UDP solution.
>>>
>>> Ziggy
>>>
>>>
>>> On 11/29/2011 02:27 PM, Roberto Spadim wrote:
>>>
>>> where is the rfc2217 implention in owlib?
>>> i want know what commands owserver send to ser2net and start the udp
>>> protocol in microcontroller
>>>
>>> 2011/11/29 Roberto Spadim <[email protected]>
>>>
>>>> i will try to develop the rfc2217 in udp
>>>> all data send via udp is sent to serial, but character 0xff allow
>>>> change of baud rate and others thinks like rfc2217 tells
>>>> this could work?
>>>>
>>>>
>>>> 2011/11/29 Roberto Spadim <[email protected]>
>>>>
>>>>> uhmmmm nice...
>>>>> well we could develop the protocol without changing baud rate?
>>>>> the reset is need for what? power up? search bus?
>>>>> could we change tcp to udp? it´s easier to implement in
>>>>> microcontroller
>>>>>
>>>>>
>>>>> 2011/11/29 Ziggy <[email protected]>
>>>>>
>>>>>> You really need to read the datasheet to understand the issues. But
>>>>>> the
>>>>>> biggest issue is that of resetting the DS2480 itself, not in the
>>>>>> 1-wire
>>>>>> commands/data.
>>>>>>
>>>>>> You have basically two methods of resetting the chip:
>>>>>> - power cycle the chip
>>>>>> - reset it via software
>>>>>>
>>>>>> Hardware
>>>>>> If the 2480 is power stealing from the serial port, you can close the
>>>>>> port and reopen it, causing the control leads to toggle. This does a
>>>>>> power cycle of the chip. Otherwise you need to somehow remove power
>>>>>> from
>>>>>> the chip and reapply it.
>>>>>>
>>>>>> Software
>>>>>> The DS2480B will perform a master reset equivalent to the power-on
>>>>>> reset
>>>>>> if it detects start polarity in place of the stop bit. As described in
>>>>>> the datasheet, you have a couple of methods of doing this:
>>>>>>
>>>>>> - send BREAK sequence
>>>>>> - send character with SPACE parity
>>>>>>
>>>>>> A BREAK sequence is usually defined as 350ms or more of a continuous
>>>>>> SPACE condition. Setting the port speed to 4800 and sending a NULL
>>>>>> will
>>>>>> cause SPACE condition for enough 9600 bps bit times that the 2480
>>>>>> resets. It's sort of a simulated BREAK. This is why some 1W drivers
>>>>>> want
>>>>>> to change the port speed.
>>>>>>
>>>>>> With no TCP you have no telnet, and without telnet protocol you have
>>>>>> no
>>>>>> IAC BRK, which is used by terminal/port servers to generate a BREAK
>>>>>> signal on the serial port. You also have no RFC2217 so no way to
>>>>>> change
>>>>>> the port speed and use the 4800 bps NULL character method. It's only
>>>>>> the
>>>>>> sending a character with SPACE parity that may work over UDP.
>>>>>>
>>>>>> The final thing to remember is that the DS2480B powers up in 9600 bps
>>>>>> mode. So the serial port on your UDP/serial converter must be set to
>>>>>> 9600 bps. This is going to limit throughput but again, without
>>>>>> TCP/telnet/RFC2217 you can't change the port speed in-band via
>>>>>> software.
>>>>>>
>>>>>> I guess the summary is that DS2480B on a UDP/serial converter should
>>>>>> work if the DS2480B device reset is accomplished by sending the
>>>>>> character with SPACE parity. Havent tried it myself though.
>>>>>>
>>>>>> Ziggy
>>>>>>
>>>>>>
>>>>>> On 11/29/2011 12:13 PM, Roberto Spadim wrote:
>>>>>> > hi guys, someone could explain how ds2480b works?
>>>>>> > for example, what it must do with serial port (change baud rates,
>>>>>> > set/read DTS RTS etc.., send / receive)
>>>>>> > most important commands
>>>>>> >
>>>>>> > not all datasheet just some important points
>>>>>> >
>>>>>> > --
>>>>>> > Roberto Spadim
>>>>>> > Spadim Technology / SPAEmpresarial
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> All the data continuously generated in your IT infrastructure
>>>>>> contains a definitive record of customers, application performance,
>>>>>> security threats, fraudulent activity, and more. Splunk takes this
>>>>>> data and makes sense of it. IT sense. And common sense.
>>>>>> http://p.sf.net/sfu/splunk-novd2d
>>>>>> _______________________________________________
>>>>>> Owfs-developers mailing list
>>>>>> [email protected]
>>>>>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Roberto Spadim
>>>>> Spadim Technology / SPAEmpresarial
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Roberto Spadim
>>>> Spadim Technology / SPAEmpresarial
>>>>
>>>
>>>
>>>
>>> --
>>> Roberto Spadim
>>> Spadim Technology / SPAEmpresarial
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> All the data continuously generated in your IT infrastructure
>>> contains a definitive record of customers, application performance,
>>> security threats, fraudulent activity, and more. Splunk takes this
>>> data and makes sense of it. IT sense. And common
>>> sense.http://p.sf.net/sfu/splunk-novd2d
>>>
>>>
>>>
>>> _______________________________________________
>>> Owfs-developers mailing
>>> [email protected]https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>>
>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> All the data continuously generated in your IT infrastructure
>>> contains a definitive record of customers, application performance,
>>> security threats, fraudulent activity, and more. Splunk takes this
>>> data and makes sense of it. IT sense. And common sense.
>>> http://p.sf.net/sfu/splunk-novd2d
>>> _______________________________________________
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>>
>>
>> --
>> Roberto Spadim
>> Spadim Technology / SPAEmpresarial
>>
>> ------------------------------------------------------------------------------
>> All the data continuously generated in your IT infrastructure
>> contains a definitive record of customers, application performance,
>> security threats, fraudulent activity, and more. Splunk takes this
>> data and makes sense of it. IT sense. And common sense.
>>
>> http://p.sf.net/sfu/splunk-novd2d_______________________________________________
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>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>
>>
>>
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>> All the data continuously generated in your IT infrastructure
>> contains a definitive record of customers, application performance,
>> security threats, fraudulent activity, and more. Splunk takes this
>> data and makes sense of it. IT sense. And common sense.
>> http://p.sf.net/sfu/splunk-novd2d
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>>
>>
>
>
> --
> Roberto Spadim
> Spadim Technology / SPAEmpresarial
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
>
> http://p.sf.net/sfu/splunk-novd2d_______________________________________________
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> [email protected]
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
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> [email protected]
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
------------------------------------------------------------------------------
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contains a definitive record of customers, application performance,
security threats, fraudulent activity, and more. Splunk takes this
data and makes sense of it. IT sense. And common sense.
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