A lot of changes. UART works. Timer function work but sei() fucks shit up.

.vscode/c_cpp_properties.json

@@ -0,0 +1,19 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/usr/avr/include",
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "__AVR_ATmega32U4__"
+            ],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c17",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-clang-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "files.associations": {
+        "io.h": "c",
+        "sfr_defs.h": "c"
+    }
+}

Makefile

@@ -2,9 +2,9 @@ TARGETNAME = togglePin
 BUILDFOLDER = ./build/
 TARGET = $(BUILDFOLDER)$(TARGETNAME)
 
-INC = -Isrc/include -I/usr/lib/avr/include/
+INC = -Isrc/include -I/usr/avr/include
-CFLAGS = -Wall -Wpedantic -Wextra -g -Os -mmcu=atmega328p
+CFLAGS = -Wall -Wpedantic -Wextra -Os -mmcu=atmega32u4
-CPPFLAGS = -DF_CPU=16000000UL
+CPPFLAGS = -DF_CPU=8000000UL
 
 SRC = $(wildcard src/*.c)
 
@@ -17,7 +17,7 @@ $(TARGET): $(SRC)
 	rm $@.elf
 
 flash:
-	avrdude -p m328p -P /dev/ttyUSB0 -c arduino -b 57600 -Uflash:w:"$(TARGET).hex":i
+	avrdude -p m32u4 -P /dev/ttyACM0 -c avr109 -Uflash:w:"$(TARGET).hex":i
 
 clean:
 	rm -fr ./src/*.o ./build/

src/inverter.c

@@ -0,0 +1,110 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include <stdio.h>
+
+void togglePin(uint8_t port, uint8_t pin);
+
+void initCtcTimer0(void);
+void initOverflowTimer0(void);
+void initOverflowTimer1(void);
+
+void initUart(unsigned int baud);
+void uart_sendByte(uint8_t byte);
+int uart_printf(char var, FILE *stream);
+
+static FILE stream = FDEV_SETUP_STREAM(uart_printf, NULL, _FDEV_SETUP_WRITE);
+
+uint8_t sec = 0;
+
+int main()
+{
+	stdout = &stream;
+
+	/* Make PB1 & PB2 an output pin */
+	DDRB |= (1 << DDB1);
+	DDRB |= (1 << DDB2);
+
+	/* With this frequency, it is 38,4k baud */
+	initUart(12);
+
+	while (1) {
+		_delay_ms(1000);
+		printf("Seconds passed: %u\n\r", sec++);
+	}
+
+	return 0;
+}
+
+
+
+void initCtcTimer0(void)
+{
+	/* Initialize counter 0 */
+	TCNT0 = 0;
+
+	/* Enable Counter0 Compare Match A Interrupt */
+	TIMSK0 |= (1 << OCIE0A);
+	
+	/* Select clock. Prescaler of 0*/
+	TCCR0B |= (1 << CS00);
+	
+	/* Use CTC Mode */
+	TCCR0A |= (1 << WGM01);
+
+	/* 
+	 * OCR0A contains TOP value for counter:
+	 */
+	OCR0A = 200;
+}
+
+void initOverflowTimer0(void)
+{
+	/* Prescaler = 0 */
+	TCCR0B |= (1<<CS00);
+
+	/* Enable Timer Overflow Interrupt */
+	TIMSK0 |= (1<<TOIE0);
+}
+
+void initOverflowTimer1(void)
+{
+	TCCR1B |= (1<<CS11);
+	TIMSK1 |= (1<<TOIE1);
+}
+
+ISR(TIMER0_COMPA_vect)
+{
+	PORTB ^= (1 << PB2);
+}
+
+void initUart(unsigned int baud)
+{
+	/* Set baud rate */
+	UBRR1H = (unsigned char)(baud>>8);
+	UBRR1L = (unsigned char)baud;
+	
+	/* Enable receiver and transmitter */
+	UCSR1B = (1<<RXEN1)|(1<<TXEN1);
+
+	/* Set frame format */
+	UCSR1C |= (3<<UCSZ10); // 8 data bits
+	// UCSR1C &= ~(1<<USBS1); // 1 stop bit
+}
+
+void uart_sendByte(uint8_t byte)
+{
+	/* Wait for empty transmit buffer */
+	while (!(UCSR1A & (1<<UDRE1)))
+	{
+	}
+
+	/* Put data into buffer, sends the data */
+	UDR1 = byte;
+}
+
+int uart_printf(char var, FILE *stream)
+{
+	uart_sendByte(var);
+	return 0;
+}

src/togglePin.c

@@ -1,17 +0,0 @@
-#include <avr/io.h>
-#include <util/delay.h>
-
-
-int main()
-{
-	DDRB |= 1 << PB2;
-
-	while (1) {
-		PORTB &= ~(1 << PB2);
-		_delay_ms(10);
-		PORTB |= 1 << PB2;
-		_delay_ms(10);
-	}
-
-	return 0;
-}