96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* \brief
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* Handles the control of the USART for communication with the ATmega1284p
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* for sending commands.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#ifndef __UART_H__
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#define __UART_H__ 1
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#include <inttypes.h>
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/** \name ASCII characters defined */
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/** \{ */
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#define SOF_CHAR (0x01) /**< Start-of-frame character. */
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#define EOF_CHAR (0x04) /**< End-of-frame character. */
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#define TERM_CHAR (0x14) /**< Control-T ASCII value for entering terminal mode. */
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/** \} */
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/** \name Define Lengths. */
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/** \{ */
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#define MAX_CMD_LENGTH (0x0A)
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#define ACK_LENGTH (0x02)
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/** \} */
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/** \name Define IO result values. */
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/** \{ */
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#define IO_SUCCESS (0)
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#define IO_FAIL (1)
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/** \} */
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#define LEN_BYTE (0)
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#define CMD_BYTE (1)
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#define BAUD_RATE_38400 (12)
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/* Macros & Defines */
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#define BUFSIZE 80
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/** \brief Circular buffer structure */
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typedef struct {
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volatile uint8_t head; /**< Index to last available character in buffer. */
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volatile uint8_t tail; /**< Index to first available character in buffer. */
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uint8_t buf[BUFSIZE]; /**< The actual buffer used for storing characters. */
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} tcirc_buf;
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extern tcirc_buf rxbuf;
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#define rx_char_ready() (rxbuf.head != rxbuf.tail)
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/* Serial port functions */
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void uart_init(void);
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void uart_deinit(void);
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uint8_t uart_circ_buf_has_char(tcirc_buf *cbuf);
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void uart_clear_rx_buf(void);
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uint8_t uart_get_char_rx(void);
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void uart_send_byte(uint8_t byte);
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void uart_serial_send_frame(uint8_t cmd, uint8_t payload_length, uint8_t *payload);
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void uart_serial_rcv_frame(uint8_t wait_for_it);
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#endif /* __UART_H__ */
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