78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
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/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __SPI_ARBITER_H__
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#define __SPI_ARBITER_H__
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#include <cstddef>
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#include "spi_pp.hpp"
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namespace spi {
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namespace arbiter {
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class Arbiter {
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public:
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constexpr Arbiter(
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SPI& bus
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) : _bus(bus),
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_config(nullptr)
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{
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}
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void transfer(const SPIConfig* const config, void* const data, const size_t count) {
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if( config != _config ) {
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_bus.stop();
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_bus.start(*config);
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_config = config;
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}
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_bus.transfer(data, count);
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}
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private:
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SPI& _bus;
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const SPIConfig* _config;
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};
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class Target {
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public:
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constexpr Target(
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Arbiter& arbiter,
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const SPIConfig& config
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) : _arbiter(arbiter),
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_config(config)
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{
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}
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void transfer(void* const data, const size_t count) {
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_arbiter.transfer(&_config, data, count);
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}
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private:
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Arbiter& _arbiter;
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const SPIConfig _config;
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};
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} /* arbiter */
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} /* spi */
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#endif/*__SPI_ARBITER_H__*/
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