42/42_EXT_03_42chips
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added comments on mod01 ex00

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hugogogo
2025-03-05 17:22:18 +01:00
parent c6fe9462a0
commit 0f01eda65f
1 changed files with 11 additions and 8 deletions
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19
module01/ex00/main.c
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@@ -25,7 +25,7 @@
#define TURN_OFF_LED(bit) CLEAR(PORTB, bit)
#define TOGGLE_LED(led) TOGGLE_PIN(B, led)
// ELEMENTS
#define D1 0
#define D2 1
#define D3 2
@@ -33,17 +33,18 @@
#define SW1 2
#define SW2 4
// TIME
#define PRESCALE_VALUE 1024
#if (PRESCALE_VALUE == 1)
#define PRESCALE_SET (1 << CS10)
#define PRESCALE_SET (1 << CS10)
#elif (PRESCALE_VALUE == 8)
#define PRESCALE_SET (1 << CS11)
#define PRESCALE_SET (1 << CS11)
#elif (PRESCALE_VALUE == 64)
#define PRESCALE_SET (1 << CS10) | (1 << CS11)
#define PRESCALE_SET (1 << CS10) | (1 << CS11)
#elif (PRESCALE_VALUE == 256)
#define PRESCALE_SET (1 << CS12)
#define PRESCALE_SET (1 << CS12)
#elif (PRESCALE_VALUE == 1024)
#define PRESCALE_SET (1 << CS10) | (1 << CS12)
#define PRESCALE_SET (1 << CS10) | (1 << CS12)
#endif
#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
@@ -51,12 +52,14 @@ int main() {
MODE_OUTPUT(B, D2);
TURN_OFF_LED(D2);
TCCR1B |= (PRESCALE_SET); // set timer with prescale
TCCR1B |= (PRESCALE_SET); // set timer with prescale
// -> set timer with bits CS10-12, in register TCCR1B : 16.4 Timer/Counter Clock Sources
// -> prescale values : 16.11.2 TCCR1B – Timer/Counter1 Control Register B, table 16-5. Clock Select Bit Description
while(1) {
if ( TCNT1 >= TIME_MS(500)) {
TOGGLE_LED(D2);
TCNT1 = 0; // reset timer value
TCNT1 = 0; // reset timer value
}
}
}