update

uart.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 Oleg Borodin <onborodin@gmail.com>
+ * Copyright 2017-2024 Oleg Borodin <onborodin@gmail.com>
  *
  */
 #include <stdio.h>
@@ -60,3 +60,11 @@ void uart_init(void) {
     REG_SETDOWN_BIT(UCSR0B, UDRIE0);
     _delay_ms(20);
 }
+
+void uart_handle(void) {
+    volatile uint8_t xchar;
+    while ((xchar = fifo_getc(&uart_outbuf)) > 0) {
+        while (!REG_BIT_ISUP(UCSR0A, UDRE0));
+        UDR0 = xchar;
+    }
+}