1 files changed, 31 insertions, 0 deletions
diff --git a/door_lock/uart.c b/door_lock/uart.c
new file mode 100644
index 0000000..1a9956d
--- /dev/null
+++ b/door_lock/uart.c
@@ -0,0 +1,31 @@
+#include <avr/io.h>
+#include <util/setbaud.h>
+
+#include "uart.h"
+
+void uart_init(void)
+{
+	UBRR0H = UBRRH_VALUE;
+	UBRR0L = UBRRL_VALUE;
+#if USE_2X
+	UCSR0A |= (1 << U2X0);
+#else
+	UCSR0A &= ~(1 << U2X0);
+#endif
+	UCSR0B = (1 << TXEN0) | (1 << RXEN0);
+	UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
+}
+
+uint8_t uart_recv(void)
+{
+	while (!(UCSR0A & (1 << RXC0)))
+		;
+	return UDR0;
+}
+
+void uart_send(uint8_t c)
+{
+	while (!(UCSR0A & (1 << UDRE0)))
+		;
+	UDR0 = c;
+}