init mod04 ex02

module04/ex02/main.c

@@ -0,0 +1,72 @@
+#include "header.h"
+
+typedef struct {
+    int *value;
+    int max;
+	int min;
+} IncrementParams;
+
+void print_binary(int value) {
+	int mask_3 = 0b1000;
+	int bit_at_3 = value & mask_3;
+	int bit_at_4 = bit_at_3 << 1;
+	PORTB = (value & 0b111) + bit_at_4;
+}
+
+void increment_int(IncrementParams *params) {
+	int *value = params->value;
+	int max = params->max;
+	*value = (*value >= max) ? max : ++(*value);
+}
+
+void decrement_int(IncrementParams *params) {
+	int *value = params->value;
+	int min = params->min;
+    *value = (*value <= min) ? min : --(*value);
+}
+
+void increment_led(void *param) {
+	IncrementParams *params = (IncrementParams *)param;
+	increment_int(params);
+	print_binary(*(params->value));
+}
+
+void decrement_led(void *param) {
+	IncrementParams *params = (IncrementParams *)param;
+	decrement_int(params);
+	print_binary(*(params->value));
+}
+
+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);
+	}
+}
+
+// write a program that increments and decrements a binary number using the buttons, and displays the result on the LEDs
+int main() {
+	MODE_OUTPUT(LED1);
+	MODE_OUTPUT(LED2);
+	MODE_OUTPUT(LED3);
+	MODE_OUTPUT(LED4);
+	MODE_INPUT(BUTTON1);
+	MODE_INPUT(BUTTON2);
+	
+	int value = 0;
+    int max = 15;
+	int min = 0;
+    IncrementParams params = {&value, max};
+
+	while(1) {
+		on_press(SW1, increment_led, &params);
+		on_press(SW2, decrement_led, &params);
+	}
+}
+
+ISR(TIMER0_COMPA_vect) {
+}