Digi Watchport/T temperature sensor as /dev/ttyU

[Karl Denninger]

On 8/9/2016 01:36, O. Hartmann wrote:
> On Sun, 24 Jul 2016 13:12:35 -0600
> Ian Lepore <ian at freebsd.org> wrote:
>
>> On Sun, 2016-07-24 at 12:52 -0600, Warner Losh wrote:
>>> On Sun, Jul 24, 2016 at 12:42 PM, Kevin Oberman <rkoberman at gmail.com>
>>> wrote:  
>>>> There are several different USB serial drivers. Off-hand I see
>>>> ubser, ubsa,
>>>> uchcom, ucom, ucycom, uftdi, ubgensa, umcs, umct, umoscom, uplcom,
>>>> usb_serial, uslcom, and uvscom. Whether any of these will support
>>>> the TI
>>>> chip, I can't say. Most have man pages, but a few, as has been
>>>> noted, are
>>>> lacking one.  
>>> I tried to automate discovery of these things. However, the only way
>>> you can really know for sure about the TI chip is to read it's
>>> datasheet
>>> and compare that with extant drivers. It's actually easier than it
>>> sounds.
>>>
>>> I've often thought of unification of the TTY USB drivers, since they
>>> are
>>> most (but not all) based on the standard plus extra bits.
>>>
>>> Warner  
>> To reiterate:  we do not have a driver for TI 5052 chips.
>>
>> It's not much like other usb-serial chips.  In fact it's not strictly a
>> usb-serial chip, it's a multifunction chip that includes a software
>> -controllable usb hub, 2 serial ports, gpio, an i2c bus master, an MCU
>> interface, a multichannel DMA controller, and apparently even has the
>> ability to download your own 8052-compatible microcontroller code into
>> the 5052 and have it take over from the built-in rom code.
>>
>> It would be reasonable enough to write a driver that initially
>> supported only the uart part of the chip.
>>
>> -- Ian
> Now, that I know that I can not use any of our plenty Digi Watchport/T sensors
> with FreeBSD, I'm looking for a cheap alternative of sensor, prefereably being
> capable of taking temperature and humidity and being accessed as easy as a
> serial terminal - as the Digi Watchport/T does with Linux.
>
> I still have a "resistance" changing the OS of our infrastructure to Linux due
> to ZFS, but the very good support of drivers with the Linux OS is tempting ...
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Does hardware platform matter?  If not a very inexpensive alternative
set is found on Adafruit's site for the Raspberry Pi and FreeBSD can
easily talk to either some of the options directly or a cheap ($10)
4-channel 12-bit analog board.  I am using this approach with the Pi2 as
a pool controller with multiple temperature inputs and drive (through a
relay board) to handle both the VFD-controlled pump motor and valves,
plus spa heater.

-- 
Karl Denninger
karl at denninger.net
/The Market Ticker/


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