This repository was archived by the owner on Jan 29, 2023. It is now read-only.
This repository was archived by the owner on Jan 29, 2023. It is now read-only.
Bug when going from a >20000us period to a <20000us period. The timer period become 4 times greater. #3
Description
Describe the bug
If I set a interval greater than 20000us and then set a smaller than 20000us, I'll have my period 4 times bigger than expected.
Steps to Reproduce
SAMDTimer ITimer(TIMER_TC3);
uint32_t myClockTimer=0,lastMicros=0;
void clock(void)
{
myClockTimer=micros()-lastMicros; //2us come from here
lastMicros=micros();
}
void setup() {
}
void loop(){
ITimer.attachInterruptInterval(20005, clock); //myClockTimer=20003 (20005 minus 2us, it's correct)
delay(5000);
ITimer.attachInterruptInterval(19995, clock); //myClockTimer=79978(4 times bigger than expected, minus 2us)
delay(5000);
}
Expected behavior
The expected behavior was a timer period of 19995us.
Actual behavior
The actual behavior was a timer period 4 times bigger.
Information
Arduino Core v1.8.9
Atmel Studio
Some observations
If I start with 19000us, works fine. Then I go to 21000us, works fine. When I go back to 19000us, the bug happen.
Only noticed when going from a bigger(>20000) to smaller(<20000). And since this happen the smaller won't work anymore.
I'm suspecting some bug with the preScaler.