The GOOD_crc variable is set to 1 when there is a CRC error! Indeed,
in the last two procedures from the library, the reading continue in a
loop until GOOD_crc will be zero (a good reading). What if no reading
will return a good one? How many times we can afford to cycle in that
loop? Here experience is needed and I don't have it yet.
The procedures can remain procedures and we can test the GOOD_crc
variable status also in the testing programs.
Vasi
On Dec 14, 11:35 am, vasile surducan <[email protected]> wrote:
> Hi Vasi
> On Tue, Dec 14, 2010 at 3:08 AM, funlw65(Vasi) <[email protected]>
> wrote:
> > The raw temperature on Arduino library is computed like this:
> > int16_t rawTemperature = (((int16_t)scratchPad[TEMP_MSB]) << 8) |
> > scratchPad[TEMP_LSB];
> > Is used a signed word.
> > Look at examples, I think library support also negative temperatures.
> > The temperature is computed later, in another procedure and a sign is
> > detected...
> I don't want to use signed words since I'm displaying on 7 seg.
> Working with words and then converting to BCD is a huge waste of code.
> > For an unique sensor on wire:
> > procedure s_temp_18B20(byte out inches, byte out fraction, bit out
> > signed)
> On the procedure below, probably there is a problem if CRC is bad,
> it remains hang in a repeat-untill loop, right?
> I've noticed if the CRC is bad at the first reading it remains bad even
> is
> read
> in a loop.
> procedure s_temp_18B20_CRC(byte out inches, byte out fraction, bit out
> > signed) is
> Did you test the multiple sensors? Usually all kind of nasty things may
> appear
> when more than 1 sensor is on the bus.
> thx,
> Vasile
> > For multiple sensors:
> > procedure temp_18B20(byte out inches, byte out fraction, bit out
> > signed) is
> > procedure temp_18B20_CRC(byte out inches, byte out fraction, bit out
> > signed) is
> > Vasi
> > On Dec 13, 2:17 pm, vasile surducan <[email protected]> wrote:
> > > On Mon, Dec 13, 2010 at 2:14 PM, funlw65(Vasi) <[email protected]>
> > wrote:
> > > > Thank you for solution. You mean, JAL is more efficient than
> > > > assembler?
> > > Jal is a dream. Use words only.[?]
> > > > I really need to find some time to learn assembler. I did once for
> > > > Z80, but I had the required book... don't have it anymore...
> > > > On Dec 13, 2:04 pm, vasile surducan <[email protected]> wrote:
> > > > > if sign == high then ; negative temperatures
> > > > > assembler
> > > > > comf t_lsb,f ;complement all two bytes
> > > > > comf t_msb,f
> > > > > incf t_lsb,f ;inc. low byte always
> > > > > skpnz ;skip if no carry to higher bytes
> > > > > incf t_msb,f ;carry to next byte
> > > > > end assembler
> > > > > end if
> > > > > Maybe you translate this in jal, as word is producing too long
> > code...
> > > > > Vasile
> > > > > On Mon, Dec 13, 2010 at 1:57 PM, funlw65(Vasi)
> > > > > <[email protected]>
> > > > wrote:
> > > > > > Then, I believe you are right. I will see on Arduino library
> > > > > > how
> > they
> > > > > > do it... if there is not another source...
> > > > > > Vasi.
> > > > > > On Dec 13, 1:51 pm, vasile surducan <[email protected]>
> > > > > > wrote:
> > > > > > > OK, apai nu cred c-o sa mearga...because you didn't computed
> > > > > > > the
> > > > two's
> > > > > > > complement for negative temperature display.
> > > > > > > Vasile
> > > > > > > On Mon, Dec 13, 2010 at 1:46 PM, funlw65(Vasi) <
> > [email protected]>
> > > > > > wrote:
> > > > > > > > Hi Vasile,
> > > > > > > > Not tested it yet but I will! do it tomorrow - pentru ca
> > > > > > > > azi
> > mai am
> > > > de
> > > > > > > > taiat niste lemne cu drujba :-D
> > > > > > > > On Dec 13, 9:12 am, vasile surducan <[email protected]>
> > wrote:
> > > > > > > > > Hi Vasi,
> > > > > > > > > I'm just curious, this library works Ok with negative
> > > > temperatures
> > > > > > too?
> > > > > > > > > thx,
> > > > > > > > > Vasile
> > > > > > > > > On Wed, Aug 18, 2010 at 2:42 PM, vasi vasi <
> > [email protected]>
> > > > > > wrote:
> > > > > > > > > > We don't have yet a 1wire library and I needed it for
> > > > > > > > > > a
> > DS18B20
> > > > > > > > temperature
> > > > > > > > > > sensor. But I found one written by Vasile and adapted
> > > > > > > > > > by
> > Jean
> > > > > > > > Marchaudon,
> > > > > > > > > > included in Bert van Dam package. Is there a reason
> > > > > > > > > > why not
> > > > > > including
> > > > > > > > it in
> > > > > > > > > > Jallib? For a DS18B20 library, I did one (not really
> > > > necessarily)
> > > > > > > > looking at
> > > > > > > > > > And-Tech.pl samples for their EvB 4.3 board and at
> > > > > > > > > > Bert
> > > > library,
> > > > > > > > > > ds1822_1_wire.jal. Now, I have working examples [?]
> > > > > > > > > > but
> > lots of
> > > > > > > > warnings.
> > > > > > > > > > Here is also a "disabled" sensor config.range and
> > resolution
> > > > > > function ,
> > > > > > > > not
> > > > > > > > > > tested - needs advices from experts. All functions
> > > > > > > > > > which
> > start
> > > > > > with
> > > > > > > > "s_"
> > > > > > > > > > are for a unique device on bus - others require the ID
> > > > > > > > > > for
> > > > access a
> > > > > > > > sensor
> > > > > > > > > > on multiple sensors on bus.
> > > > > > > > > > First example (thermometer.jal and an image included)
> > > > > > > > > > is
> > > > reading a
> > > > > > > > unique
> > > > > > > > > > device on 1wire bus and the second is reading the
> > > > > > > > > > device on
> > a
> > > > > > multi.
> > > > > > > > sensor
> > > > > > > > > > bus, using the ID discovered in first example.
> > > > > > > > > > Maybe is useful in taking some decisions about this
> > > > > > > > > > (new
> > and
> > > > > > general
> > > > > > > > > > libraries, samples, etc...)
> > > > > > > > > > --
> > > > > > > > > > Vasi
> > > > > > > > > > --
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> >
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> > > >
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> >
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> > > >
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> >
<jallib%[email protected]<jallib%[email protected]>
> > > > > > > > > > .
> > > > > > > > > > For more options, visit this group at
> > > > > > > > > >http://groups.google.com/group/jallib?hl=en.
> > > > > > > > > 330.png
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