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update macro prescale values

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hugogogo
2025-03-07 11:34:17 +01:00
parent 1bb2e880c8
commit 08e1200408
6 changed files with 53 additions and 58 deletions
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20
module01/ex03/main.c
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@@ -52,17 +52,13 @@
// TIME
#define PRESCALE_VALUE 1024 // can be 1, 8, 64, 256, 1024
// table 16-5 : prescale sets
#if (PRESCALE_VALUE == 1)
#define PRESCALE_SET (0<<CS12 | 0<<CS11 | 1<<CS10)
#elif (PRESCALE_VALUE == 8)
#define PRESCALE_SET (0<<CS12 | 1<<CS11 | 0<<CS10)
#elif (PRESCALE_VALUE == 64)
#define PRESCALE_SET (0<<CS12 | 1<<CS11 | 1<<CS10)
#elif (PRESCALE_VALUE == 256)
#define PRESCALE_SET (1<<CS12 | 0<<CS11 | 0<<CS10)
#elif (PRESCALE_VALUE == 1024)
#define PRESCALE_SET (1<<CS12 | 0<<CS11 | 1<<CS10)
#endif
#define PRESCALE_SET(value) \
((value) == 1 ? (0<<CS12 | 0<<CS11 | 1<<CS10) : \
(value) == 8 ? (0<<CS12 | 1<<CS11 | 0<<CS10) : \
(value) == 64 ? (0<<CS12 | 1<<CS11 | 1<<CS10) : \
(value) == 256 ? (1<<CS12 | 0<<CS11 | 0<<CS10) : \
(value) == 1024? (1<<CS12 | 0<<CS11 | 1<<CS10) : \
(0<<CS12 | 0<<CS11 | 0<<CS10))
#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
#define PERIOD 1000
#define DUTY_CYCLE 10
@@ -129,7 +125,7 @@ int main() {
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
TCCR1B |= (PRESCALE_SET); // start the timer with the prescaler
TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE)); // start the timer with the prescaler
while(1) {
on_press(SW1, increment_duty_cycle, &params);