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Contiki port for the Atmel AVR Raven board

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adamdunkels 2008-10-14 09:40:30 +00:00
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commit 0a961b2ada
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platform/avr-ravenlcd/uart.h Normal file
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/*
* Copyright (c) 2008 Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* \brief
* Handles the control of the USART for communication with the ATmega1284p
* for sending commands.
*
* \author
* Mike Vidales mavida404@gmail.com
*
*/
#ifndef __UART_H__
#define __UART_H__ 1
#include <inttypes.h>
/** \name ASCII characters defined */
/** \{ */
#define SOF_CHAR (0x01) /**< Start-of-frame character. */
#define EOF_CHAR (0x04) /**< End-of-frame character. */
#define TERM_CHAR (0x14) /**< Control-T ASCII value for entering terminal mode. */
/** \} */
/** \name Define Lengths. */
/** \{ */
#define MAX_CMD_LENGTH (0x0A)
#define ACK_LENGTH (0x02)
/** \} */
/** \name Define IO result values. */
/** \{ */
#define IO_SUCCESS (0)
#define IO_FAIL (1)
/** \} */
#define LEN_BYTE (0)
#define CMD_BYTE (1)
#define BAUD_RATE_38400 (12)
/* Macros & Defines */
#define BUFSIZE 80
/** \brief Circular buffer structure */
typedef struct {
volatile uint8_t head; /**< Index to last available character in buffer. */
volatile uint8_t tail; /**< Index to first available character in buffer. */
uint8_t buf[BUFSIZE]; /**< The actual buffer used for storing characters. */
} tcirc_buf;
extern tcirc_buf rxbuf;
#define rx_char_ready() (rxbuf.head != rxbuf.tail)
/* Serial port functions */
void uart_init(void);
void uart_deinit(void);
uint8_t uart_circ_buf_has_char(tcirc_buf *cbuf);
void uart_clear_rx_buf(void);
uint8_t uart_get_char_rx(void);
void uart_send_byte(uint8_t byte);
void uart_serial_send_frame(uint8_t cmd, uint8_t payload_length, uint8_t *payload);
void uart_serial_rcv_frame(uint8_t wait_for_it);
#endif /* __UART_H__ */