dingusppc/devices/i2c.h
2020-06-03 20:28:57 +02:00

97 lines
2.9 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-20 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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 <https://www.gnu.org/licenses/>.
*/
/** @file I2C bus emulation.
Author: Max Poliakovski
*/
#ifndef I2C_H
#define I2C_H
#include <stdexcept>
#include <cstring>
#include <string>
#include <thirdparty/loguru/loguru.hpp>
/** Base class for I2C devices */
class I2CDevice {
public:
virtual void start_transaction() = 0;
virtual bool send_subaddress(uint8_t sub_addr) = 0;
virtual bool send_byte(uint8_t data) = 0;
virtual bool receive_byte(uint8_t* p_data) = 0;
};
/** Base class for I2C hosts */
class I2CBus {
public:
I2CBus() {
std::memset(this->dev_list, 0, sizeof(this->dev_list));
};
~I2CBus() {
std::memset(this->dev_list, 0, sizeof(this->dev_list));
};
virtual void register_device(uint8_t dev_addr, I2CDevice* dev_obj) {
if (this->dev_list[dev_addr]) {
throw std::invalid_argument(std::string("I2C address already taken!"));
}
this->dev_list[dev_addr] = dev_obj;
LOG_F(INFO, "New I2C device, address = 0x%X", dev_addr);
};
virtual bool start_transaction(uint8_t dev_addr) {
if (this->dev_list[dev_addr]) {
this->dev_list[dev_addr]->start_transaction();
return true;
} else {
return false;
}
};
virtual bool send_subaddress(uint8_t dev_addr, uint8_t sub_addr) {
if (!this->dev_list[dev_addr]) {
return false; /* no device -> no acknowledge */
}
return this->dev_list[dev_addr]->send_subaddress(sub_addr);
};
virtual bool send_byte(uint8_t dev_addr, uint8_t data) {
if (!this->dev_list[dev_addr]) {
return false; /* no device -> no acknowledge */
}
return this->dev_list[dev_addr]->send_byte(data);
};
virtual bool receive_byte(uint8_t dev_addr, uint8_t* p_data) {
if (!this->dev_list[dev_addr]) {
return false; /* no device -> no acknowledge */
}
return this->dev_list[dev_addr]->receive_byte(p_data);
};
protected:
I2CDevice* dev_list[128]; /* list of registered I2C devices */
};
#endif /* I2C_H */