42/42_EXT_03_42chips
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

wip better delay m04e02

Browse Source
This commit is contained in:
hugogogo
2025-03-17 17:43:11 +01:00
parent 3cd6e72b8d
commit 8532b4ad26
1 changed files with 62 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
module04/ex02/main.c
View File

@@ -20,7 +20,13 @@
// 13.2.6 : PCMSK2 – Pin Change Mask Register 2 // 13.2.6 : PCMSK2 – Pin Change Mask Register 2
// -> (1 << PCINT20) | (1 << PCINT18) // -> (1 << PCINT20) | (1 << PCINT18)
#define TIMER_TOP_MS 20
volatile uint8_t value = 0; volatile uint8_t value = 0;
volatile Boolean pressed = FALSE;
volatile Boolean timer_0_init = FALSE;
volatile Boolean timer_delay_enabled = FALSE;
volatile uint16_t timer_delay = 0;
void print_binary(int value) { void print_binary(int value) {
int mask_3 = 0b1000; int mask_3 = 0b1000;
@@ -53,14 +59,58 @@ void decrement_led() {
print_binary(value); print_binary(value);
} }
void timer0_init_1_ms() {
TCCR0A |= (1 << WGM01); // CTC mode
OCR0A = 249; // Compare match every 1ms (F_CPU / Prescaler = 16,000,000 / 64 = 250,000 ticks/sec)
TIMSK0 |= (1 << OCIE0A); // Enable Compare Match A interrupt
TCCR0B |= (1 << CS01) | (1 << CS00); // Prescaler 64
sei(); // Enable global interrupts
timer_0_init = TRUE;
}
void launch_delay_ms(void) {
if (!timer_0_init) {
timer0_init_1_ms();
}
CLEAR(PCICR, PCIE2); // disable interupt PCINT2
CLEAR(PCMSK2, PCINT20);
CLEAR(PCMSK2, PCINT18);
timer_delay = 0;
timer_delay_enabled = TRUE;
SET(PCIFR, PCIF2); // reset flag interrupt PCINT2
}
ISR(TIMER0_COMPA_vect) {
if (!timer_delay_enabled) {
return;
}
timer_delay++;
if (timer_delay >= TIMER_TOP_MS) {
// TOGGLE_ELEM(LED1);
timer_delay_enabled = FALSE;
SET(PCICR, PCIE2); // re-enable interupt PCINT2
SET(PCMSK2, PCINT20);
SET(PCMSK2, PCINT18);
}
}
void on_press(int bit, void (*action)(void)) { void on_press(int bit, void (*action)(void)) {
if ((TEST(PIND, bit)) == 0) { // if ((TEST(PIND, bit)) == 0) {
// action();
// _delay_ms(20);
// while ((TEST(PIND, bit)) == 0) {
// continue;
// }
// _delay_ms(20);
// }
launch_delay_ms();
if (!pressed) {
// if ((TEST(PIND, bit)) == 0) {
// }
pressed = TRUE;
action(); action();
_delay_ms(20); } else {
while ((TEST(PIND, bit)) == 0) { pressed = FALSE;
continue;
}
_delay_ms(20);
} }
} }
@@ -84,6 +134,10 @@ int main() {
} }
ISR(PCINT2_vect) { ISR(PCINT2_vect) {
on_press(SW1, increment_led); if (!TEST_PIN(BUTTON1)) {
on_press(SW2, decrement_led); on_press(SW1, increment_led);
}
if (!TEST_PIN(BUTTON2)) {
on_press(SW2, decrement_led);
}
} }