fw/common/ - copied from IDBG and generalized a little

fw/common/uart.h

@@ -0,0 +1,46 @@
+/*
+ * common/uart.h - UART initialization and debug output
+ *
+ * Written 2008 by Werner Almesberger
+ * Copyright 2008 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef UART_H
+#define UART_H
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include "config.h"
+
+
+#ifdef CONFIG_DEBUG
+#define debug printk
+#define CONFIG_PRINTK
+#else
+#define debug(...)
+#endif
+
+#ifdef CONFIG_ERROR
+#define error printk
+#define CONFIG_PRINTK
+#else
+#define error(...)
+#endif
+
+#ifdef CONFIG_PRINTK
+#define printk printf_fast
+#else
+#define printk(...)
+#endif
+
+void putchar(char c);
+void uart_init(uint8_t brg_mhz);
+
+#endif /* !UART_H */