I am trying to use a timer to record an array of data for a fixed sample time. So I set timer1 which is not used in the avr-pololu lib and use interrupt to call serial communication functions. I used the following code for timer setting and interruption.
DDRB |= (1 << 0); // Set LED as output
TCCR1B |= (1 << WGM12); // Configure timer 1 for CTC mode
TIMSK1 |= (1 << OCIE1A); // Enable CTC interrupt
sei(); // Enable global interrupts
OCR1A = 53391; // Set CTC compare value to 10Hz at 20MHz AVR clock, with a prescaler of 8
TCCR1B |= (1 << CS11); // Start timer at Fcpu/8
One interesting thing is, when I use the combination of serial_send and wait_for_sending_to_finish(), the interruption only happens once, and stuck at the second “wait_for_sending_to_finish”. However, when I tried the serial_send_blocking, which as I see is nothing but combination of serial_send and wait_for_sending_to_finish(), it works well.
I am very curious about what happened here. Hope anybody is interesting and give me some clue.
Thanks for your concerns.