first commit

ATMEGA_SERIAL_UART/ATMEGA_SERIAL_UART.ino

@@ -0,0 +1,28 @@
+#include<avr/io.h>
+ 
+#define USART_BAUDRATE 9600
+#define BAUD_PRESCALE (((F_CPU/(USART_BAUDRATE*16UL)))-1)
+ 
+int main(void){
+ char recieved_byte;
+  
+ UCSR0B |= (1<<RXEN0)  | (1<<TXEN0);
+ UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01);
+ UBRR0H  = (BAUD_PRESCALE >> 8);
+ UBRR0L  = BAUD_PRESCALE;
+  
+    for(;;){
+  // wait until a byte is ready to read
+  while( ( UCSR0A & ( 1 << RXC0 ) ) == 0 ){}
+ 
+  // grab the byte from the serial port
+  recieved_byte = UDR0;
+   
+  // wait until the port is ready to be written to
+  while( ( UCSR0A & ( 1 << UDRE0 ) ) == 0 ){}
+ 
+  // write the byte to the serial port
+  UDR0 = recieved_byte;
+    }
+    return 0;   /* never reached */
+}