96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file I2C bus emulation.
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Author: Max Poliakovski
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*/
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#ifndef I2C_H
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#define I2C_H
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#include <stdexcept>
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#include <string>
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#include <thirdparty/loguru/loguru.hpp>
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/** Base class for I2C devices */
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class I2CDevice {
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public:
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virtual void start_transaction() = 0;
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virtual bool send_subaddress(uint8_t sub_addr) = 0;
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virtual bool send_byte(uint8_t data) = 0;
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virtual bool receive_byte(uint8_t* p_data) = 0;
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};
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/** Base class for I2C hosts */
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class I2CBus {
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public:
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I2CBus() {
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std::memset(this->dev_list, 0, sizeof(this->dev_list));
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};
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~I2CBus() {
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std::memset(this->dev_list, 0, sizeof(this->dev_list));
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};
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virtual void register_device(uint8_t dev_addr, I2CDevice* dev_obj) {
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if (this->dev_list[dev_addr]) {
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throw std::invalid_argument(std::string("I2C address already taken!"));
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}
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this->dev_list[dev_addr] = dev_obj;
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LOG_F(INFO, "New I2C device, address = 0x%X", dev_addr);
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};
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virtual bool start_transaction(uint8_t dev_addr) {
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if (this->dev_list[dev_addr]) {
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this->dev_list[dev_addr]->start_transaction();
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return true;
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} else {
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return false;
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}
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};
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virtual bool send_subaddress(uint8_t dev_addr, uint8_t sub_addr) {
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if (!this->dev_list[dev_addr]) {
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return false; /* no device -> no acknowledge */
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}
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return this->dev_list[dev_addr]->send_subaddress(sub_addr);
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};
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virtual bool send_byte(uint8_t dev_addr, uint8_t data) {
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if (!this->dev_list[dev_addr]) {
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return false; /* no device -> no acknowledge */
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}
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return this->dev_list[dev_addr]->send_byte(data);
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};
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virtual bool receive_byte(uint8_t dev_addr, uint8_t* p_data) {
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if (!this->dev_list[dev_addr]) {
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return false; /* no device -> no acknowledge */
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}
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return this->dev_list[dev_addr]->receive_byte(p_data);
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};
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protected:
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I2CDevice* dev_list[128]; /* list of registered I2C devices */
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};
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#endif /* I2C_H */
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