dingusppc/devices/common/i2c/athens.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 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 Athens clock generator definitions. */
#ifndef ATHENS_H
#define ATHENS_H
#include <devices/common/hwcomponent.h>
#include <devices/common/i2c/i2c.h>
#include <cinttypes>
#define ATHENS_NUM_REGS 8
constexpr auto ATHENS_XTAL = 31334400.0f; // external crystal oscillator frequency
namespace AthensRegs {
enum AthensRegs: uint8_t {
ID = 0,
D2 = 1,
N2 = 2,
P2_MUX2 = 3,
VN_CTRL = 4, // vendor specific control bits
BD1 = 5,
BN1 = 6,
P1 = 7
};
}; // namespace AthensRegs
class AthensClocks : public I2CDevice, public HWComponent
{
public:
AthensClocks(uint8_t dev_addr);
~AthensClocks() = default;
// I2CDevice methods
void start_transaction();
bool send_subaddress(uint8_t sub_addr);
bool send_byte(uint8_t data);
bool receive_byte(uint8_t* p_data);
// methods for querying virtual frequences
int get_sys_freq();
int get_dot_freq();
private:
uint8_t my_addr = 0;
uint8_t reg_num = 0;
int pos = 0;
uint8_t regs[ATHENS_NUM_REGS];
};
#endif // ATHENS_H