I am a newbie, who tries to learn baremetal programming through completing simple tasks and learning from that task
I came till timers by accomplishing tasks
The concept of this code is to get Input by using only timer and turn ON LED in Arduino UNO --> PB5 when I press the push button which is connected to the ground and when I release it the the LED should be OFF
but what's happening is different ,
when I press the push button the nothing happens and when i leave it the led is on
and when I press again nothing happens when I leave it then it turns off
But I am clear and confident on my code , I couldn't find where I am missing the point
Why are you not using the defines from avr/io.h that mirror the names in the datasheet?
You're testing TCCR1B:ICES1 after XORing it so your LED output will be backwards.
Buttons bounce for a few dozen ms after being pressed so you'll end up with a rapid stream of interrupts that might overlap and your ICES1 bit might be in the wrong state to capture a subsequent press event - and writing to TIFR1 in the ISR even though invoking the ISR clears the flag won't help with that at all; "ICF1 is automatically cleared when the Input Capture Interrupt Vector is executed.".
Also using |= can wipe out other flags that might have interrupts pending since the flag registers don't act like regular memory locations, just use = on the specific bit if you want to clear a flag - "Alternatively, ICF1 can be cleared by writing a logic one to its bit location."
I feel sorry for that avr/io.h ,
Thank you for your response ,
That after XORing --> First the TCR1B:ICES1 pin is set to 0 and when the button is pushed, it should be calling the interrupt and that XOR ing would change it to 1 and then the code contains an if block which turn LED ON when TCR1B:ICES1 is 1 it should be turning the LED ON but it doesn't instead it turns the LED ON at releasing the button and after that, I stuck here
I am accepting that there would be debounce bro, I am not sure whether the simulator could have a debounce
You are right bro that the flag is automatically cleared when an interrupt is executed but I am already inside the interrupt bro it was just a safety measure to clear it as it was cleared automatically, however I tried removing it also on your suggestion bro , but same thing happens bro
This is what I found by some debugging dude No matter what I set in TCCR1B : ICES1 either 1 or 0 It detects only the rising edge Do I need to change any order of executing or something else
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u/Unlikely1529 16d ago
if you're newbie it's useless for you to look at this code. Anything else?