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Very simple frequency generator

 
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Pzx

Bascom Member



Joined: 05 May 2015
Posts: 39

poland.gif
PostPosted: Wed Sep 09, 2020 3:33 pm    Post subject: Very simple frequency generator Reply with quote
Hello,

I found very simple frequency generator on Timer1 published by Arek2014 in "Share your working BASCOM-AVR code here" section.
What about Timer2?
Can we do similar thing using Timer2?
Timer1 is 16-bit and Timer2 is 8-bit so I would expect change in frequency range and resolution, this is not a problem.

Original code of Arek2014:

Code:

$crystal = 8000000
Config Timer1 = Timer , Prescale = 1 ,clear timer = 1, Compare_a = Toggle    'generator frequency!!! OC1A
'Ocr1a = 500
dim freq as word
dim f as dword
Enable Interrupts
enable timer1

do
f = 4000000 / freq  'f crystal / 2 !!!
print f ; "Hz"
Ocr1a = freq    'changing dim freq --> change frequency
loop


My Code that generates frequency about 28kHz on OC2A output:

Code:
Config Timer2 = Timer , Prescale = 256 , Compare A = Toggle , Clear Timer = 1       '(wyjscie OC2a)
Enable Timer2
Config Portb.4 = Output                                     'OC2a Generator


But when I want to modify the frequency by OCR2A it stops working.

Code:
Config Timer2 = Timer , Prescale = 256 , Compare A = Toggle , Clear Timer = 1       '(wyjscie OC2a)
Enable Timer2
Config Portb.4 = Output                                     'OC2a Generator
Ocr2a = 100


Why?

(BASCOM-AVR version : 2.0.8.3 )

Last edited by Pzx on Wed Sep 09, 2020 7:50 pm; edited 9 times in total
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Pzx

Bascom Member



Joined: 05 May 2015
Posts: 39

poland.gif
PostPosted: Wed Sep 09, 2020 4:48 pm    Post subject: Reply with quote
Ok, after some time I found that my second code also works.
The frequency is much lower so I could not see it on my oscyloscope with the same presets Smile
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