initial commit

include/uart.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <stddef.h>
+
+void uart_init();
+void uart_send(unsigned int c);
+byte_t uart_getb();
+char uart_getc();
+void uart_puts(char *s);
+void uart_hex(unsigned int d);