init

main.c

@@ -0,0 +1,61 @@
+#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);
+    
+    }
+
+}