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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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24
module01/ex00/main.c
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@@ -51,17 +51,13 @@
// 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)
// END MACROS
@@ -70,12 +66,12 @@ int main() {
MODE_OUTPUT(LED2);
CLEAR_ELEM(LED2);
TCCR1B |= (PRESCALE_SET); // 16.4 : set timer according to prescale value, in register TCCR1B, table 16-5 : prescale sets
TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE)); // 16.4 : set timer according to prescale value, in register TCCR1B, table 16-5 : prescale sets
while(1) {
if (TCNT1 >= TIME_MS(500)) { // 16.11.4 : read timer with register TCNT1 (read/write allowed), that combines two 8 bits registers
if (TCNT1 >= TIME_MS(500)) { // 16.11.4 : read timer with register TCNT1 (read/write allowed), that combines two 8 bits registers
TOGGLE_PIN(LED2);
TCNT1 = 0; // reset timer value, also in register TCNT1
TCNT1 = 0; // reset timer value, also in register TCNT1
}
}
}