Write Onewire data toa I2C memory / read ASCI

[Eugeniu]

Hi !

I have a display with leds . If I write a text to a I2C memory (24FC512),I can read and scroll this text on leds display . But...I wish to write the result of measurement from ONEWIRE sensor DS1820 for example :

" temperature = (((temperature >> 1) * 100) - 25) + (((count_per_c - count_remain) * 100) / count_per_c) "


and to read / display ASCI karacter , something like this :

"i2cread I2CDAT , I2CCLK , $A0,adrr,[karacter]" karacter to be ASCI code

I can not know to do this . Can somebody to help me ?

Thank you very much !
PS. Escuse me ! I do not know so well english .

[inse]

Hi Eugeniu,

it's not clear to me what you want to do, maybe point 4.17.7. in the manual is what you should have a look at.

4.17.7 DIG
DIG returns the value of a decimal digit. Simply tell it the digit number
(0 - 4 with 0 being the rightmost digit) you would like the value of, and
voila.
B0 = 123 ‘ Set B0 to 123
B1 = B0 DIG 1 ‘ Sets B1 to 2 (digit 1 of
123)

This allows you to separate each digit from the computed result.

But you can also divide the word into two bytes using the .lowbyte and .highbyte modifiers and write them to the display or memory.

HTH

Regards,
Ingo

[Eugeniu]

Hi Eugeniu,

it's not clear to me what you want to do, maybe point 4.17.7. in the manual is what you should have a look at......................

I will try to explain :

I use in this moment .....writing a text in a I2C memory ........

for adr = 0 to 135
lookup adr,["WELLCOM ! .......................... 5"],c
I2cwrite I2CDAT , I2CCLK , $A0,ADR,[C]
pause 5
next adr

Read text :

i2cread I2CDAT , I2CCLK , $A0,J,[caracter]

Use " case " for select :

SELECT CASE CARACTER
CASE 65: SIR_NO=4 ;A
CASE 66: SIR_NO=9 ;B
CASE 67: SIR_NO=14 ;C
CASE 68: SIR_NO=19 ;D
CASE 69: SIR_NO=24 ;E

and .....go for select what leds are on .....

TABLOU:
LOOKUP OFSET,[_
$3F,$48,$48,$48,$3F,_ ;A 0-4
$36,$49,$49,$49,$7F,_ ;B 4-9
$22,$41,$41,$41,$3E,_ ;C 9-14
$3E,$41,$41,$41,$7F,_ ;D 14-19
$41,$49,$49,$49,$7F,_ ;E 19-24

I wish to write time to time in memory a temperature from a Onewire sensor tip DS1820 and when I read from memory to find there a ASCI CODE to can use same , in my program .

[aratti]

I have difficulty in understanding what you want to do! You should post the complete code to better understand what you have done and what you want to achieve.

Remember that you cannot write and read with the same control!

use:

WriteDev con %10100000
ReadDev con %10100001

Perhaps it will solve your present problem.

Al.

[Eugeniu]

I have difficulty in understanding what you want to do!

You should post the complete code to better understand what you have done and what you want to achieve.


Al.

Briefly : Tell me how can write in a I2C memory result from this :



mainloop:
OWOut DQ, 1, [$CC, $44] ' Start temperature conversion

waitloop:
OWIn DQ, 4, [count_remain] ' Check for still busy converting
If count_remain = 0 Then waitloop
OWOut DQ, 1, [$CC, $BE] ' Read the temperature
OWIn DQ, 0, [temperature.LOWBYTE, temperature.HIGHBYTE, Skip 4, count_remain, count_per_c]
temperature = (((temperature >> 1) * 100) - 25) + (((count_per_c - count_remain) * 100) / count_per_c)
'Calculate temperature in degrees C to 2 decimal places (not valid for negative temperature)

******************

adr = xx
i2cwrite I2CDAT, I2CCLK, $A0, adr,[temperature]
pause 5

******************

and how can read from memory something xx,xx (ASCI CODE )

[skimask]

Briefly : Tell me how can write in a I2C memory result from this :

I too am having a bit of difficulty in understanding what you wish to achieve...

adr = xx
i2cwrite I2CDAT, I2CCLK, $A0, adr,[temperature]
pause 5

******************

and how can read from memory something xx,xx (ASCI CODE )

Is 'temperature' a byte or a word value?
Are you wanting to get a fractional value out of the eeprom itself?
Have you put a fractional value into that location of the eeprom?

I2CREAD I2CDAT , I2CCLK , $A0 , adr , [ temp_read ] - would be a command line for starters...