Timer1 or Timer2

[Franck78]

Hello all,

I started a project with an Atmega88. The receive() uses Timer2.

Then I switched to AtMega8. And now Receive() uses Timer1.

You guessed it, it's annoying to handle, but that not the subject.

AtMega8 Atmega88 seem very similar. They both have three timers. Apparently with more or less same possibilities for the 3 timers.

Why switch to Timer1 for Atmega8 (and some others)? What can AtMega88 can do differently enough to use it ?

My 'problem' will be solved when TinySender is published (no Timers is I'm correct).

[ArminJo]

Thanks for reporting. Is fixed in current version.

[Franck78]

Hello,
not fixed for me but it can be my installation.

Using the github version,

I change the processor type only and bam.
-mmcu=atmega88p (ok)
-mmcu=atmega8 (bam)

I described the processors in 'boards.txt'

BTW, is it timer1 or timer2 that is supposed to used ?

/opt/arduino-1.8.19/hardware/tools/avr/bin/avr-gcc -c -g -Os -Wall -Wextra -std=gnu11 -ffunction-sections -fdata-sections -MMD -flto -fno-fat-lto-objects -mmcu=atmega88p 


In file included from /Arduino/libraries/IRremote/src/IRremote.hpp:273:0,
                 from  Arduino/wurlitzer/model2140/model2140.ino:223:
 Arduino/libraries/IRremote/src/private/IRTimer.hpp: In function 'void timerEnableReceiveInterrupt()':
 /Arduino/libraries/IRremote/src/private/IRTimer.hpp:470:5: error: 'TIMSK2' was not declared in this scope
     TIMSK2 = _BV(OCIE2B);   // Output Compare Match A Interrupt Enable
     ^~~~~~
/ Arduino/libraries/IRremote/src/private/IRTimer.hpp:470:5: note: suggested alternative: 'TIMSK'
     TIMSK2 = _BV(OCIE2B);   // Output Compare Match A Interrupt Enable
     ^~~~~~
....
     OCR2
 /Arduino/libraries/IRremote/src/private/IRTimer.hpp:490:5: error: 'OCR2B' was not declared in this scope
     OCR2B = TIMER_COUNT_TOP / 8;
     ^~~~~
 Arduino/libraries/IRremote/src/private/IRTimer.hpp:490:5: note: suggested alternative: 'OCR2'
     OCR2B = TIMER_COUNT_TOP / 8;
     ^~~~~
     OCR2

atmega addition to board.txt

pro.menu.cpu.16MHzatmega88=ATmega88P (5V, 16 MHz)
pro.menu.cpu.16MHzatmega88.upload.maximum_size=8000
pro.menu.cpu.16MHzatmega88.upload.maximum_data_size=1024
pro.menu.cpu.16MHzatmega88.upload.speed=19200
pro.menu.cpu.16MHzatmega88.build.mcu=atmega88p
pro.menu.cpu.16MHzatmega88.build.f_cpu=16000000L
pro.menu.cpu.16MHzatmega88.bootloader.low_fuses=0x9E
pro.menu.cpu.16MHzatmega88.bootloader.high_fuses=0xD7
pro.menu.cpu.16MHzatmega88.bootloader.extended_fuses=0xF9

pro.menu.cpu.16MHzatmega8=ATmega8P (5V, 16 MHz)
pro.menu.cpu.16MHzatmega8.upload.maximum_size=8000
pro.menu.cpu.16MHzatmega8.upload.maximum_data_size=1024
pro.menu.cpu.16MHzatmega8.upload.speed=19200
pro.menu.cpu.16MHzatmega8.build.mcu=atmega8
pro.menu.cpu.16MHzatmega8.build.f_cpu=16000000L
pro.menu.cpu.16MHzatmega8.bootloader.low_fuses=0xDF
pro.menu.cpu.16MHzatmega8.bootloader.high_fuses=0x91
pro.menu.cpu.16MHzatmega8.bootloader.extended_fuses=0xFF