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Timer0 problem on ATtiny 1634

 
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gertc

Bascom Member



Joined: 06 May 2006
Posts: 88

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PostPosted: Thu Feb 15, 2018 12:46 am    Post subject: Timer0 problem on ATtiny 1634 Reply with quote

Hello again,
I realy have problem with the 1634.
I have being using the ATtiny167 without any problem, but I need two additional ports so I am switching to the ATtiny1634
The program does not jump to "Frequency_ab" on Timer0 Interrupts

Code:

$regfile = "attiny1634.dat"
$crystal = 8000000
$hwstack = 32
$swstack = 10
$framesize = 40

Config Portb.3 = Output                 'PWM Using Timer1
Config Porta.0 = Output                 '150Hz to 500Hz Square Wave

Dim Pu As Word

'COM PORT
'Open "comb.0:9600,8,n,1" For Output As #1

Config Timer0 = Timer , Prescale = 1
On Timer0 Frequency_ab
Enable Timer0
Start Timer0
Enable Interrupts

Config Timer1 = Pwm , Pwm = 10 , Compare_a_pwm = Clear_up , Prescale = 1

Do
   Waitms 1000
   Pwm1a = 512                          '50% ~4Khz PWM on PORTB.3  (OC1A)
Loop
                            '
Frequency_ab:
   Pu = Pu + 1
   'Print #1 , "Pu: " ; Pu
   If Pu => 62 Then                     '62=500Hz  206=150Hz
      Pu = 0
   Elseif Pu >= 31 Then                 '31=500Hz  103=150Hz
      Porta.0 = 1
   Elseif Pu >= 0 Then
      Porta.0 = 0
   End If
Return

End
 



Excatly the same program (Except using different ports) it works fine with ATtiny167

Code:

$regfile = "attiny167.dat"
$crystal = 8000000
$hwstack = 32
$swstack = 10
$framesize = 40

Config Portb.0 = Output                 'PWM Using Timer1
Config Porta.2 = Output                 '150Hz to 500Hz Square Wave

Dim Pu As Word

'COM PORT
'Open "coma.0:9600,8,n,1" For Output As #1

Config Timer0 = Timer , Prescale = 1
On Timer0 Frequency_ab
Enable Timer0
Start Timer0
Enable Interrupts

Config Timer1 = Pwm , Pwm = 10 , Compare_a_pwm = Clear_up , Prescale = 1

Do
   Waitms 1000
   Pwm1a = 512                          '50% ~4Khz PWM on PORTB.0  (OC1AU)
Loop
                             '
Frequency_ab:
   Pu = Pu + 1
   'Print #1 , "Pu: " ; Pu
   If Pu => 206 Then                    '62=500Hz  206=150Hz
      Pu = 0
   Elseif Pu >= 103 Then                '31=500Hz  103=150Hz
      Porta.2 = 1
   Elseif Pu >= 0 Then
      Porta.2 = 0
   End If
Return

End
 


The only different I can see is that all the Timer0 instructions for the ATtiny 1634 are in lover case and black. Timer1 instructions Upper case and red.
Config Timer0 = Timer , Prescale = 1
On Timer0 Frequency_ab

For the Attiny167 both Timer0 and Timer1 instructions are both Upper case and red.
Config TIMER0 = Timer , Prescale = 1
On TIMER0 Frequency_ab

I don't know if that means anything?

Thanks,
gerrysc


(BASCOM-AVR version : 2.0.8.1 )
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albertsm

Administrator



Joined: 09 Apr 2004
Posts: 4590
Location: Holland

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PostPosted: Thu Feb 15, 2018 10:13 am    Post subject: Reply with quote

this is a bug in the START statement. it does not know the T1634 and enables the wrong register.
Instead write TCCR0B=1 for this chip and it should work.

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Best regards,

Mark Alberts
MCS Electronics

http://www.mcselec.com
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gertc

Bascom Member



Joined: 06 May 2006
Posts: 88

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PostPosted: Thu Feb 15, 2018 7:01 pm    Post subject: Reply with quote

Thanks,
It works. I wounder why the T167 is giving me a 500Hz square wave and the T1634 only a 314Hz square wave? Both are using 8Mhz internal clock

Here is how I am using the Tccr0b. Not quite sure if it is correct.

Code:

 ' Config Timer0 = Timer , Prescale = 1
On Timer0 Frequency_ab
Enable Timer0
Start Timer0
Tccr0b = 1
Enable Interrupts
 


Best regards,
gerrysc
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