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mod01 ex03 done

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hugo LAMY
2025-03-06 13:11:26 +01:00
parent 29687bfdf5
commit e1b76139c5
1 changed files with 42 additions and 2 deletions
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44
module01/ex03/main.c
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@@ -1,4 +1,5 @@
#include <avr/io.h>
#include <util/delay.h>
// stringify
#define STRINGIFY_HELPER(x) #x
@@ -64,11 +65,49 @@
#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
#define PERIOD 1000
#define DUTY_CYCLE 10
#define PERCENT(percent, period) (((float)percent / 100) * period)
// END MACROS
typedef struct {
int duty_cycle;
int max;
int min;
} IncrementParams;
void increment_duty_cycle(void *param) {
IncrementParams *params = (IncrementParams *)param;
if(params->duty_cycle < params->max) {
params->duty_cycle += 10;
}
OCR1A = TIME_MS(PERCENT(params->duty_cycle, PERIOD));
}
void decrement_duty_cycle(void *param) {
IncrementParams *params = (IncrementParams *)param;
if(params->duty_cycle > params->min) {
params->duty_cycle -= 10;
}
OCR1A = TIME_MS(PERCENT(params->duty_cycle, PERIOD));
}
void on_press(int bit, void (*action)(void*), void *params) {
if ((TEST(PIND, bit)) == 0) {
action(params);
_delay_ms(20);
while ((TEST(PIND, bit)) == 0) {
continue;
}
_delay_ms(20);
}
}
int main() {
int duty_cycle = DUTY_CYCLE;
int max = 100;
int min = 0;
IncrementParams params = {duty_cycle, max, min};
MODE_OUTPUT(LED2);
// Table 16-4 : set timer in Fast PWM (Pulse With Modulation) mode with TOP = ICR1 (Mode 14)
@@ -83,12 +122,13 @@ int main() {
ICR1 = TIME_MS(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(DUTY_CYCLE);
OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD));
// start the timer with the prescaler
TCCR1B |= (PRESCALE_SET);
while(1) {
continue;
on_press(SW1, increment_duty_cycle, &params);
on_press(SW2, decrement_duty_cycle, &params);
}
}