added comment bout channel A

module02/ex01/main.c

@@ -132,6 +132,7 @@ void uart_printstr(const char* str) {
 }
 
 // print hello world, on serial port, every 2 seconds, with empty infinite loop
+// `screen /dev/ttyUSB0 115200`
 int main() {
 	uart_init();
 
@@ -141,7 +142,7 @@ int main() {
 	TIMSK1 |= (1 << OCIE1A);						// Enable CTC interrupt
 	sei();											// Enable global interrupts
 
-	OCR1A = TIME_MS(PERIOD);						// Table 16-4 : set CTC compare value, the counter is cleared to zero when the counter value (TCNT1) matches the OCR1A register
+	OCR1A = TIME_MS(PERIOD);						// Table 16-4 : set CTC compare value on channel A, the counter is cleared to zero when the counter value (TCNT1) matches the OCR1A register
 
 	TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE));		// 16.4 : set timer according to prescale value, in register TCCR1B, table 16-5 : prescale sets