42/42_EXT_03_42chips
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added comment bout channel A

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hugogogo
2025-03-07 12:07:56 +01:00
parent f0566e8bde
commit 444925be21
4 changed files with 5 additions and 4 deletions
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2
module01/ex01/main.c
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@@ -71,7 +71,7 @@ int main() {
TCCR1A |= (1 << COM1A0); // 14.3.1 : set Compare Output with COM1A0, it toggles OC1A on compare match (Table 16-1), OC1A is alternate function for PORTB1 (Table 14-3)
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));

2
module01/ex02/main.c
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@@ -77,7 +77,7 @@ int main() {
ICR1 = TIME_MS(PERIOD); // Table 16-4 : set the period (compare TOP value)
OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD)); // 16.9.3 : set the duty cycle to DUTY_CYCLE% of the time -> OC1A (alternate function of PORTB1, aka LED2) is cleared when TCNT1 (the counter value) equals OCR1A
OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD)); // 16.9.3 : set the duty cycle to DUTY_CYCLE% of the time on channel A -> OC1A (alternate function of PORTB1, aka LED2) is cleared when TCNT1 (the counter value) equals OCR1A
TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE)); // start the timer with the prescaler

2
module01/ex03/main.c
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@@ -123,7 +123,7 @@ int main() {
ICR1 = TIME_MS(PERIOD); // Table 16-4 : set the period (compare TOP value)
OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD)); // 16.9.3 : set the duty cycle to DUTY_CYCLE% of the time -> OC1A (alternate function of PORTB1, aka LED2) is cleared when TCNT1 (the counter value) equals OCR1A
OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD)); // 16.9.3 : set the duty cycle to DUTY_CYCLE% of the time in channel A -> OC1A (alternate function of PORTB1, aka LED2) is cleared when TCNT1 (the counter value) equals OCR1A
TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE)); // start the timer with the prescaler

3
module02/ex01/main.c
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@@ -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