/**
 * Serial port access.
 */
module hulk.serial;

import hulk.cpu;
import core.stdc.stdarg;
static import hulk.writef;

struct Serial
{
    enum BASE_PORT = 0x3F8;

    /**
     * Initialize the serial module.
     */
    static void initialize()
    {
    }

    /**
     * Write a character to the serial port.
     *
     * @param ch Character to write.
     */
    static void write(ubyte ch)
    {
        if (ch == '\n')
        {
            out8(BASE_PORT, '\r');
        }
        out8(BASE_PORT, ch);
    }

    /**
     * Write a formatted string to the serial port.
     *
     * @param s Format string.
     * @param args Variable arguments structure.
     */
    public static void writef(string s, va_list args)
    {
        hulk.writef.writefv(function void(ubyte ch) {
                    Serial.write(ch);
                }, s, args);
    }

    /**
     * Write a formatted string to the serial port.
     *
     * @param s Format string.
     */
    public static extern (C) void writef(string s, ...)
    {
        va_list args;
        va_start(args, s);
        writef(s, args);
        va_end(args);
    }

    /**
     * Write a formatted string and newline to the serial port.
     *
     * @param s Format string.
     */
    public static extern (C) void writefln(string s, ...)
    {
        va_list args;
        va_start(args, s);
        writef(s, args);
        writef("\n", args);
        va_end(args);
    }
}