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/*
* $Id$
*
* Serial subsystem
*
* Copyright (C) 2009 Michael Moon <triffid.hunter@gmail.com>
* 2010 Markus Hitter <mah@jump-ing.de>
*
* This is a pretty lean, fast and powerful serial subsystem, taken from
* RepRaps' Teacup firmware: https://github.com/Traumflug/Teacup_Firmware .
* For even more simplification, support for XON/XOFF flow control was stripped.
*
* The system uses ringbuffers for both transmit and receive, and
* intelligently decides whether to wait or drop transmitted characters if
* the buffer is full. It's tested on many versions of the ATmega.
*/
#ifndef _SERIAL_H
#define _SERIAL_H
#include <stdint.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#define MASK(PIN) (1 << PIN)
// initialise serial subsystem
void serial_init(void);
// return number of characters in the receive buffer,
// and number of spaces in the send buffer
uint8_t serial_rxchars(void);
// read one character
uint8_t serial_popchar(void);
// send one character
void serial_writechar(uint8_t data);
// read/write many characters
void serial_writestr(uint8_t *data);
// write from flash
void serial_writestr_P(PGM_P data);
#endif /* _SERIAL_H */
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