init

build.sh

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+avr-gcc -Os -DF_CPU=16000000L -DBAUD=9600UL -mmcu=atmega328p main.c -o main.o
+avr-objcopy -O ihex main.o main.hex
+avrdude -v -patmega328p -carduino -P/dev/ttyUSB0 -b57600 -D -Uflash:w:main.hex:i
+ rm main.o main.hex

listen.sh

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+#stty -F /dev/ttyUSB0 cs8 9600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts
+
+stty -F /dev/ttyUSB0 9600 -parenb -parodd cs8 -hupcl \
+-cstopb cread clocal -crtscts -iuclc -ixany -imaxbel \
+-iutf8 -opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill \
+ -ofdel nl0 cr0 tab0 bs0 vt0 ff0 -isig -icanon -iexten \
+-echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt \
+-echoctl -echoke
+
+
+tail -f /dev/ttyUSB0

main.c

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+#include <util/delay.h>
+#include <avr/io.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <util/setbaud.h>
+#define LED PORTB5
+#define WIRE PORTB0
+
+
+void uart_init() {
+    // Upper and lower bytes of the calculated prescaler value for baud.
+    UBRR0H = UBRRH_VALUE;
+    UBRR0L = UBRRL_VALUE;
+
+    // Configure data frame size to 8-bits.
+    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
+
+    // Configure to enable transmitter.
+    UCSR0B = _BV(TXEN0);
+}
+
+void uart_putchar(char c) {
+    // Wait until the register to write to is free.
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+
+    // Write the byte to the register.
+    UDR0 = c;
+}
+
+void uart_putstr(char *data) {
+    // Loop until end of string writing char by char.
+    while(*data){
+      uart_putchar(*data++);
+    }
+}
+
+
+int main(void) {
+    
+    uart_init();
+
+    DDRB |= (1 << LED);
+    DDRB |= (1 << WIRE);
+    for(;;){
+            
+
+        uart_putstr("hello\n");
+        
+        _delay_ms(100);
+        
+        PORTB |= (1 << LED);
+        PORTB |= (1 << WIRE);
+        
+        _delay_ms(100);
+        
+        PORTB &= (0 << LED);
+        PORTB &= (0 << WIRE);
+    
+    }
+
+}