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carrhd
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 Posted: Sun Apr 16, 2023 1:13 am Post subject: Help with Timer/Counter on ATTINY85 |
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Greetings.
I am used to working on a MEGA2560. I've switched to an ATTINY85 for a new project. The code that I normally use to get a one second tick isn't working. COMPARE0A, OC0A, COMPARE1A, or OC1A to work. I see them in the XML file but they aren't recognized as keywords. I'm probably doing something dumb but I can't figure out what it is. It doesn't like the PRESCALE in the config either.
This is the code I normally use:
' +------------------------------------+
' | INTERRUPT SETUP - 1 SECOND TICK |
' +------------------------------------+
declare Sub Compare1a_int()
config Timer1 = Timer , Prescale = 1024 , Clear Timer = 1
on Compare1a Compare1a_int Saveall
enable Compare1a
stop Timer1
Timer1 = 0
Compare1a = 15625 ' 1 Second
start Timer1
enable interrupts
' +------------------------------------+
' | INTERRUPT SERVICE ROUTINE |
' +------------------------------------+
Sub Compare1a_int()
doIt = true
end sub
(BASCOM-AVR version : 2.0.8.2 , Latest : 2.0.8.5 ) |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Sun Apr 16, 2023 11:25 am Post subject: Re: Help with Timer/Counter on ATTINY85 |
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| carrhd wrote: | | COMPARE0A, OC0A, COMPARE1A, or OC1A to work. I see them in the XML file but they aren't recognized as keywords. |
I have to disagree.
Output pins are called OC0/1A, it would make no sense to name compare registers this way, but COMPARE0A works for example.
| Quote: | | I see them in the XML file but they aren't recognized as keywords. |
You can check the ATtiny85.DAT file in Bascom's program directory and you'll find:
| Code: | OCR0A = $29
PWM0A= $29
COMPARE0A= $29 |
Different naming for the same register OCR0A and register address &H29.
| Quote: | | I'm probably doing something dumb but I can't figure out what it is. |
You have truly a very bouquet of issues.
| Quote: | | It doesn't like the PRESCALE in the config either. |
Really?
| Quote: | | This is the code I normally use: |
I suggest you post real code and not lookalike one.
This is real code and it compiles:
| Code: | $Regfile="attiny85.dat"
$Crystal=1000000 ' internal RC, CKDIV8 fuse set
$hwstack=40
$swstack=16
$framesize=32
declare Sub Compare1a_int()
Dim doIt as Byte
Const True = 1
Const False = 0
config Timer1 = Timer , Prescale = 16384 , Clear Timer = 1
on Compare1a Compare1a_int Saveall
enable Compare1a
stop Timer1
Timer1 = 0
Compare1a = 60 ' approx 1 second, can be adjusted with OSCCAL
start Timer1
enable interrupts
Do
Loop
Sub Compare1a_int()
doIt = true
end sub |
Some hints:
- without processor and stack declaration within code, settings of the IDE apply, which may be different.
- without declaring true/false, for example by a Const, the compiler won't know them.
- without dimensioning variables, it won't compile.
- without main loop you won't have much fun.
- Timer0 and Timer1 in ATTiny 85 are 8-bit timers, assigning a 16-bit value as TOP may return odd results.
- to achieve 1-sec interrupts with internal RC-Osc 8MHz and max. Timer1-prescale, the CKDIV8 needs to be set (low).
- for doing CTC (Clear Timer = 1), the TOP value is set by OCR0A in Timer0, in Timer1 by OCR1C.
- be aware that ATTiny85 sports an ATtiny15 compatibility mode, which is enabled by a certain clock setting.
- read the data sheet.
- read the data sheet.
- read the data sheet.
ATTiny85 is an interesting, as well a special processor.
Especially Timer1, which may serve as high frequency PLL timer and sports things like dead time generation for motor controllers. |
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carrhd
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| Posted: Sun Apr 16, 2023 12:05 pm Post subject: |
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Thank you for the reply.
It appears that part of my problem may have been that I was using an older version of Bascom. I have updated to the latest version and am getting closer.
When I compiled your code I got the error:
Error : 46 Line : 23 Assignment error, unknown variable (DIM) [COMPARE1A: 0 60: 112] , in File : G:\My Drive\Embedded\SapMaster 2021\rom-switcher-101.bas
It likes COMPARE0A but not COMPARE1A.
Hank. |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Sun Apr 16, 2023 12:34 pm Post subject: |
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Look up the dat-file for COMPARE1A, if not declared add it, or use OCR1A instead.
Edit:
It compiled ok with ATTiny45, but by just checking again, not with ATTiny85.
Difference is, ATTiny45.DAT:
| Code: | OCR1A =$2e
COMPARE1A=$2E
PWM1A=$2E
OCR1C = $2d
COMPARE1C=$2D
PWM1C=$2D |
ATTiny85.DAT:
| Code: | OCR1A =$2e
OCR1C = $2d |
Replace the block in T85 against the one in T45 and you'll be good.
Backup the original ATTiny85.DAT first. |
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carrhd
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| Posted: Sun Apr 16, 2023 1:40 pm Post subject: |
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Awesome. Thanks.
I just finished moving my ducks and am going to make breakfast for my son then I will try it.
Did I mention that prescale is not working?
I'll get back to you shortly.
Hank |
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carrhd
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| Posted: Sun Apr 16, 2023 3:01 pm Post subject: |
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Now it works. Many thanks!
BTW...I've written tens of thousands of lines of Bascom AVR over the years. Interrupts still cause me problems but that's a me problem, not a Bascom problem.
Bascom runs this entire room.
https://www.youtube.com/watch?v=-Gz0KUlNmJ8
Have a great day.
Hank. |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Sun Apr 16, 2023 8:18 pm Post subject: |
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| carrhd wrote: | | Now it works. Many thanks! |
You're welcome.
| Quote: | | BTW...I've written tens of thousands of lines of Bascom AVR over the years. |
I wasn't able to assume this the way you've put your post.
| Quote: | | Interrupts still cause me problems but that's a me problem, not a Bascom problem. |
Interrupts are not difficult, if one observes a few basic rules.
| Quote: | | Bascom runs this entire room. |
Great.
Have fun. |
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oi18ct
Joined: 08 Mar 2022
Posts: 22
Location: North Branch, Minnesota
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| Posted: Mon Apr 17, 2023 5:59 am Post subject: |
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Watched your YouTube video. Nice!!! Cant say I am shocked a Canadian is automating maple tree sap processing... I suppose your a curler too, like me. Nice system, looks like it was fun
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Lee |
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