ex04 almost works

module00/ex04/main.c

@@ -0,0 +1,85 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define SET(REGISTER, BIT)			REGISTER |= 1 << BIT
+#define CLEAR(REGISTER, BIT)		REGISTER &= ~(1 << BIT)
+#define TEST(REGISTER, BIT)			REGISTER & 1 << BIT
+#define TEST_PIN(PORT, BIT)			PIN ## PORT & 1 << BIT
+#define TOGGLE(REGISTER, BIT)		REGISTER ^= 1 << BIT
+#define TOGGLE_PIN(PORT, BIT)		PIN ## PORT |= 1 << BIT
+#define MODE_INPUT(PORT, BIT)		CLEAR(DDR ## PORT, BIT)
+#define MODE_OUTPUT(PORT, BIT)		SET(DDR ## PORT, BIT)
+#define IS_PIN_SET(PORT, BIT)		(TEST_PIN(PORT, BIT)) == 0
+#define IS_PIN_CLEAR(PORT, BIT)		(TEST_PIN(PORT, BIT)) == 1
+
+#define D1 0
+#define D2 1
+#define D3 2
+#define D4 4
+#define SW1 2
+#define SW2 4
+
+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(IncrementParams *params) {
+	increment_int(params);
+	print_binary(*(params->value));
+}
+
+void decrement_led(IncrementParams *params) {
+	decrement_int(params);
+	print_binary(*(params->value));
+}
+
+void on_press(int bit, void (*action)(void*), void *params) {
+	if (IS_PIN_SET(D, bit)) {
+	    action(params);
+	    _delay_ms(20);
+	    while (IS_PIN_SET(D, bit)) {
+	        continue;
+	    }
+	    _delay_ms(20);
+	}
+}
+
+int main() {
+	MODE_OUTPUT(B, D1);
+	MODE_OUTPUT(B, D2);
+	MODE_OUTPUT(B, D3);
+	MODE_OUTPUT(B, D4);
+	MODE_INPUT(D, SW1);
+	MODE_INPUT(D, SW2);
+	
+	int value = 0;
+    int max = 16;
+	int min = 0;
+    IncrementParams params = {&value, max};
+
+	while(1) {
+		on_press(SW1, increment_led, &params);
+		on_press(SW2, decrement_led, &params);
+	}
+}