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Return in ISR -- AVR Reset ??

 
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Jogi864

Bascom Member



Joined: 05 Oct 2010
Posts: 2

PostPosted: Fri Dec 12, 2014 10:01 pm    Post subject: Return in ISR -- AVR Reset ?? Reply with quote

Hi Bascom Users,

I have a question. I have connect a 12er Keypad on Port A on a Atmel 1284P.
All connections goes over a Resistor 470R on every Line.
Row 1= A1, Row2 = A2.... Col1=A5, Col2= A6...and so on.
i use PCINT to for Interrupt.

Here is the Code what is not working. It seems that the Avr do a Reset when he comes to the "Return" who is in the If.. then.. circle in the ISR (ok sorry for my bad English)



Code:

$regfile = "m1284pdef.dat"
$crystal = 14745600
$hwstack = 128
$swstack = 128
$framesize = 128
$baud = 9600

Dim Ma As Byte
Dim Z As Byte

Ddra = &B11110000
Porta = &B00001111

Print "                      ready..."

Enable Pcint0
Pcmsk0 = &B00001111
On Pcint0 Taste

Enable Interrupts
Ma = 1

Open "com1:" For Binary As #1


Do

Incr Z
Print #1 , "Zähler:" ; Z
Print #1 , "Loop"
Print #1 , "Ma: " ; Ma
Wait 3


Loop

Taste:

Print #1 , "Jetzt in ISR"

If Ma = 1 Then
     Ma = 2
     Pcifr.0 = 1
     Return
End If

Print #1 , "Jetzt ganz in ISR"

Pcifr.0 = 1
Ma = 1

Return
 


I dont know why this is not working????
but this works:

Code:


$regfile = "m1284pdef.dat"
$crystal = 14745600
$hwstack = 128
$swstack = 128
$framesize = 128
$baud = 9600

Dim Ma As Byte
Dim Z As Byte

Ddra = &B11110000
Porta = &B00001111

Print "                      ready..."

Enable Pcint0
Pcmsk0 = &B00001111
On Pcint0 Taste

Enable Interrupts
Ma = 1

Open "com1:" For Binary As #1


Do

Incr Z
Print #1 , "Zähler:" ; Z
Print #1 , "Loop"
Print #1 , "Ma: " ; Ma
Wait 3


Loop

Taste:

Print #1 , "Jetzt in ISR"

Select Case Ma

Case 1:
      Print #1 , "Jetzt ganz in ISR"
      Ma = 2

Case 2:
      Ma = 1

End Select

Pcifr.0 = 1

Return

 




(BASCOM-AVR version : 2.0.7.7 )
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MWS

Bascom Member



Joined: 22 Aug 2009
Posts: 1827

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PostPosted: Fri Dec 12, 2014 10:27 pm    Post subject: Reply with quote

Look up the help for "On Interrupt", it will give you the answer.
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i.dobson

Bascom Expert



Joined: 05 Jan 2006
Posts: 1534
Location: Basel, Switzerland

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PostPosted: Sat Dec 13, 2014 9:51 am    Post subject: Reply with quote

Hello,

Simply put you have Return within an if, the Compiler will only use a RETI (Return from Interrupt) for the first return that it sees outside conditions.

So modify your code to use IF,ELSE,ENDIF,RETURN

Regards
Ian Dobson

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Home of AVRTimer, the Bascom timer value calculator.
http://www.planet-ian.com

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Visovian

Bascom Member



Joined: 31 Oct 2007
Posts: 584
Location: Czech

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PostPosted: Sat Dec 13, 2014 2:46 pm    Post subject: Reply with quote

I would try:
Code:
Taste:

Print #1 , "Jetzt in ISR"

If Ma = 1 Then
     Ma = 2
     Pcifr.0 = 1
     Goto Fin
End If

Print #1 , "Jetzt ganz in ISR"

Pcifr.0 = 1
Ma = 1

Fin:
Return
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