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cec.h
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cec.h
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/*
* Copyright (C) 2016 Russ Dill <russ.dill@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef _CEC_H_
#define _CEC_H_
#include <avr/io.h>
#include <stdbool.h>
#define ARRAY_SIZE(n) (sizeof(n) / sizeof((n)[0]))
#define CEC_BUFFER_SIZE 16
#ifndef CEC_PUBLIC
#define CEC_PUBLIC
#endif
#ifndef CEC_MONITOR
#define CEC_MONITOR 0
#endif
/* Error types */
#define CEC_ERR_NONE 0
#define CEC_ERR_ARB_LOST 1
#define CEC_ERR_NACK 2
#define CEC_ERR_NO_EOM 3
#define CEC_ERR_LOW_DRIVE 4
#define CEC_ERR_HALT 5
#define CEC_ERR_HW 6
#define CEC_STATUS_OVERRUN _BV(6)
#define CEC_STATUS_NACK _BV(7)
CEC_PUBLIC void cec_init(void);
CEC_PUBLIC void cec_halt(void) __attribute__((unused));
CEC_PUBLIC void cec_periodic(unsigned int delta);
CEC_PUBLIC void cec_transmit_init_hw(void);
CEC_PUBLIC bool cec_addr_match(unsigned char addr) __attribute__((unused));
CEC_PUBLIC void cec_addr_init(void);
CEC_PUBLIC void cec_addr_periodic(void);
CEC_PUBLIC bool cec_addr_ready(void) __attribute__((unused));
CEC_PUBLIC unsigned char cec_addr_build(unsigned char source,
unsigned char target) __attribute__((unused));
/*
* There is a pull-up resistor on the output line. If we set the output
* as an input, the pull-up will drive the line high, which will drive
* the CEC line low.
*/
#if CEC_MONITOR
#define cec_receive_drive_low() do {} while(0)
#define cec_receive_float() do {} while(0)
#define cec_receive_driven() (false)
#define cec_transmit_drive_low() do {} while(0)
#define cec_transmit_float() do {} while(0)
#define cec_pin_config() do { \
CEC_PORT |= _BV(CEC_PBIN); \
} while (0)
#define cec_pin_unconfig() do { \
CEC_PORT &= ~_BV(CEC_PBOUT); \
CEC_PORT &= ~_BV(CEC_PBIN); \
} while (0)
#else
#define cec_receive_drive_low() do { \
CEC_DDR &= ~_BV(CEC_PBOUT); \
} while(0)
#define cec_receive_float() do { \
CEC_DDR |= _BV(CEC_PBOUT); \
} while (0)
#define cec_receive_driven() (!(CEC_DDR & _BV(CEC_PBOUT)))
#define cec_transmit_drive_low() do { \
CEC_PORT |= _BV(CEC_PBOUT); \
} while (0)
#define cec_transmit_float() do { \
CEC_PORT &= ~_BV(CEC_PBOUT); \
} while (0)
#define cec_output_state() (!(CEC_PIN & _BV(CEC_PBOUT)))
#define cec_input_state() (!(CEC_PIN & _BV(CEC_PBIN)))
#define cec_pin_config() do { \
CEC_DDR |= _BV(CEC_PBOUT); \
CEC_PORT |= _BV(CEC_PBIN); \
CEC_PORT |= _BV(CEC_PBOUT); \
} while (0)
#define cec_pin_unconfig() do { \
CEC_DDR &= ~_BV(CEC_PBOUT); \
CEC_PORT &= ~_BV(CEC_PBOUT); \
CEC_PORT &= ~_BV(CEC_PBIN); \
} while (0)
#endif
#endif