87 lines
2.1 KiB
C++
87 lines
2.1 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 __I2C_PP_H__
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#define __I2C_PP_H__
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#include <cstdint>
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#include "ch.h"
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#include "hal.h"
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struct I2CClockConfig {
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float clock_source_f;
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float bus_f;
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float high_period_ns;
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static constexpr float period_ns(const float f) {
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return 1e9 / f;
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}
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constexpr uint32_t i2c_period_count() const {
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return period_ns(bus_f) / period_ns(clock_source_f) + 0.5f;
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}
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constexpr uint32_t i2c_high_count() const {
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return high_period_ns / period_ns(clock_source_f) + 0.5f;
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}
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constexpr uint32_t i2c_low_count() const {
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return i2c_period_count() - i2c_high_count();
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}
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};
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class I2C {
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public:
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using address_t = uint8_t;
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constexpr I2C(I2CDriver* const driver) :
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_driver(driver) {
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}
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void start(const I2CConfig& config);
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void stop();
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bool receive(
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const address_t slave_address,
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uint8_t* const data, const size_t count,
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const systime_t timeout = TIME_INFINITE
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);
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bool transmit(
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const address_t slave_address,
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const uint8_t* const data, const size_t count,
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const systime_t timeout = TIME_INFINITE
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);
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private:
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I2CDriver* const _driver;
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bool transfer(
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const address_t slave_address,
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const uint8_t* const data_tx, const size_t count_tx,
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uint8_t* const data_rx, const size_t count_rx,
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const systime_t timeout
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);
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};
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#endif/*__I2C_PP_H__*/
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