MAX7219 Decimal point question

Archiver

Hi.

I have some difficulties with the Parallax Appkit (using the MAX 7219 LED
Display Driver) for the BS2. I need an easy way to control the decimal point
(SEG DP), to show the digits “12.50”. (Always four digits)

Take the main loop from APPkit program for BS2

Loop:
Gosub MaxDisplay
DispVal=DispVal+1
Goto Loop

Solution?
DispVal can off course not be set to 12.50 so all 4 digits must first be
separated into different variables and then the decimal added to the correct
digit before sending the information to the MAX 7219.

I have been looking into the discussion-history on Max7219 and came across some
info from 22.mars-02 suggesting to add 128 to the variable: dig2=timestr(1)+128

Yea....? It didn’t work for me. (A novice stamper)
I tried everything from DispVal=1+128 to DispVal=Dig2+128. My decimal will not
show up.

OK!

Dig1=1
Dig2=2 ‘ (should have the decimal hare)
Dig3=5
Dig4=0

How should I add the Decimal? (Please help me)
Or is it a setup problem of the MAX 7219? I don’t have a clue.




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Archiver

You might try downloading StampWorks experiment #29 from our web site. You
can find the explenation in Resources -> StampWorks Experiments and
downloadable code on the StampWorks catalog page.

-- Jon Williams
-- Parallax


In a message dated 6/29/02 5:45:52 PM Central Daylight Time,
Stein_Frostad@m... writes:


> Hi.
>
> I have some difficulties with the Parallax Appkit (using the MAX 7219 LED
> Display Driver) for the BS2. I need an easy way to control the decimal
> point (SEG DP), to show the digits

Archiver

This is a part of the code that displays temperature reading from DS1620.

'* Using The MAX7219 LED Display Driver.

nonZ = 0
for index = 5 to 1
shiftout DATA_n,CLK2,msbfirst,[noparse][[/noparse]index]
temp = DSdata dig (index-1)
if temp = 0 then skip1
nonZ = 1
skip1:
if nonZ = 1 OR temp <> 0 OR index = 1 then skip2
temp = 15
skip2:
if index <> 1 then skip3 'Lef decimal point at digit # 1
temp = temp + 128 'Set Decimal Point (eg 25.5)
skip3:
shiftout DATA_n,CLK2,msbfirst,[noparse][[/noparse]temp]
pulsout Load,5
next

goto START
'************************************************************************


>From: "xystein frostad" <Stein_Frostad@m...>
>Reply-To: basicstamps@yahoogroups.com
>To: "BasicStamp Diskusjon" <basicstamps@yahoogroups.com>
>Subject: [noparse][[/noparse]basicstamps] MAX7219 Decimal point question
>Date: Sat, 29 Jun 2002 18:45:05 -0400
>
>Hi.
>
>I have some difficulties with the Parallax Appkit (using the MAX 7219 LED
>Display Driver) for the BS2. I need an easy way to control the decimal
>point (SEG DP), to show the digits “12.50”. (Always four digits)
>
>Take the main loop from APPkit program for BS2
>
>Loop:
> Gosub MaxDisplay
> DispVal=DispVal+1
>Goto Loop
>
>Solution?
>DispVal can off course not be set to 12.50 so all 4 digits must first be
>separated into different variables and then the decimal added to the
>correct digit before sending the information to the MAX 7219.
>
>I have been looking into the discussion-history on Max7219 and came across
>some info from 22.mars-02 suggesting to add 128 to the variable:
>dig2=timestr(1)+128
>
>Yea....? It didn’t work for me. (A novice stamper)
>I tried everything from DispVal=1+128 to DispVal=Dig2+128. My decimal will
>not show up.
>
>OK!
>
>Dig1=1
>Dig2=2 ‘ (should have the decimal hare)
>Dig3=5
>Dig4=0
>
>How should I add the Decimal? (Please help me)
>Or is it a setup problem of the MAX 7219? I don’t have a clue.
>
>
>
>
>____________________________________________________________
>Win a first-class trip to New Orleans and vacation Elvis Style!.
>Enter NOW!
>http://r.lycos.com/r/sagel_mail/http://www.elvis.lycos.com/sweepstakes/
>
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