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parallel_io.h
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parallel_io.h
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// Copyright 2009 Olivier Gillet.
//
// Author: Olivier Gillet (ol.gillet@gmail.com)
//
// This program 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.
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
// -----------------------------------------------------------------------------
//
// Templates for using full ports or half-ports for parallel output
#ifndef AVRLIB_PARALLEL_H_
#define AVRLIB_PARALLEL_H_
#include <avr/io.h>
#include "avrlib/gpio.h"
namespace avrlib {
enum ParallelPortMode {
PARALLEL_BYTE,
PARALLEL_NIBBLE_HIGH,
PARALLEL_NIBBLE_LOW,
PARALLEL_TRIPLE_HIGHEST,
PARALLEL_TRIPLE_HIGH,
PARALLEL_TRIPLE_LOW,
PARALLEL_DOUBLE_HIGH,
PARALLEL_DOUBLE_MIDHIGH,
PARALLEL_DOUBLE_MIDLOW,
PARALLEL_DOUBLE_LOW
};
template<ParallelPortMode mode>
struct ShiftMasks {
enum Masks {
mask = 0xff,
shift = 0
};
};
template<>
struct ShiftMasks<PARALLEL_NIBBLE_HIGH> {
enum Masks {
mask = 0xf0,
shift = 4,
};
};
template<>
struct ShiftMasks<PARALLEL_NIBBLE_LOW> {
enum Masks {
mask = 0x0f,
shift = 0,
};
};
template<>
struct ShiftMasks<PARALLEL_TRIPLE_HIGHEST> {
enum Masks {
mask = 0xe0,
shift = 5,
};
};
template<>
struct ShiftMasks<PARALLEL_TRIPLE_HIGH> {
enum Masks {
mask = 0x38,
shift = 3,
};
};
template<>
struct ShiftMasks<PARALLEL_TRIPLE_LOW> {
enum Masks {
mask = 0x07,
shift = 0,
};
};
template<>
struct ShiftMasks<PARALLEL_DOUBLE_HIGH> {
enum Masks {
mask = 0xc0,
shift = 6,
};
};
template<>
struct ShiftMasks<PARALLEL_DOUBLE_MIDHIGH> {
enum Masks {
mask = 0x30,
shift = 4,
};
};
template<>
struct ShiftMasks<PARALLEL_DOUBLE_MIDLOW> {
enum Masks {
mask = 0x0c,
shift = 2,
};
};
template<>
struct ShiftMasks<PARALLEL_DOUBLE_LOW> {
enum Masks {
mask = 0x03,
shift = 0,
};
};
template<typename Port, ParallelPortMode parallel_mode = PARALLEL_BYTE>
struct ParallelPort {
typedef ShiftMasks<parallel_mode> Masks;
// Mode change.
static inline void set_mode(uint8_t mode) {
uint8_t preserve = (*Port::Mode::ptr() & ~Masks::mask);
if (mode == DIGITAL_INPUT) {
*Port::Mode::ptr() = preserve;
} else if (mode == DIGITAL_OUTPUT) {
*Port::Mode::ptr() = preserve | Masks::mask;
}
}
static inline void Write(uint8_t value) {
uint8_t preserve = *Port::Output::ptr() & ~Masks::mask;
*Port::Output::ptr() = preserve | (value << Masks::shift);
}
static inline void EnablePullUpResistors() {
uint8_t preserve = *Port::Output::ptr();
*Port::Output::ptr() = preserve | Masks::mask;
}
static inline uint8_t Read() {
return (*Port::Input::ptr() & Masks::mask) >> Masks::shift;
}
};
} // namespace avrlib
#endif // AVRLIB_PARALLEL_H_