serial.c - Low level functions for sending and recieving bytes via the serial port
Part of Grbl v0.9
Copyright (c) 2012-2014 Sungeun K. Jeon
Grbl 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 3 of the License, or
(at your option) any later version.
Grbl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
This file is based on work from Grbl v0.8, distributed under the
terms of the MIT-license. See COPYING for more details.
Copyright (c) 2009-2011 Simen Svale Skogsrud
Copyright (c) 2011-2012 Sungeun K. Jeon
#define RX_BUFFER_SIZE 128
#define TX_BUFFER_SIZE 64
#define SERIAL_NO_DATA 0xff
#define RX_BUFFER_FULL 96 // XOFF high watermark
#define RX_BUFFER_LOW 64 // XON low watermark
#define SEND_XOFF 1
#define SEND_XON 2
#define XOFF_SENT 3
#define XON_SENT 4
#define XOFF_CHAR 0x13
#define XON_CHAR 0x11
// Writes one byte to the TX serial buffer. Called by main program.
void serial_write(uint8_t data);
// Fetches the first byte in the serial read buffer. Called by main program.
// Reset and empty data in read buffer. Used by e-stop and reset.
// Returns the number of bytes used in the RX serial buffer.
// Returns the number of bytes used in the TX serial buffer.
// NOTE: Not used except for debugging and ensuring no TX bottlenecks.