79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-24 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 Athens clock generator definitions. */
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#ifndef ATHENS_H
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#define ATHENS_H
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#include <devices/common/hwcomponent.h>
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#include <devices/common/i2c/i2c.h>
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#include <cinttypes>
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#define ATHENS_NUM_REGS 8
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/** Default external crystal oscillator frequency. */
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constexpr auto ATHENS_XTAL = 31334400.0f;
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namespace AthensRegs {
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enum AthensRegs: uint8_t {
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ID = 0,
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D2 = 1,
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N2 = 2,
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P2_MUX2 = 3,
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VN_CTRL = 4, // vendor specific control bits
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BD1 = 5,
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BN1 = 6,
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P1 = 7
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};
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}; // namespace AthensRegs
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class AthensClocks : public I2CDevice, public HWComponent
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{
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public:
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AthensClocks(uint8_t dev_addr);
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AthensClocks(uint8_t dev_addr, const float crystal_freq);
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~AthensClocks() = default;
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// I2CDevice methods
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void start_transaction();
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bool send_subaddress(uint8_t sub_addr);
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bool send_byte(uint8_t data);
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bool receive_byte(uint8_t* p_data);
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// methods for querying virtual frequences
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int get_sys_freq();
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int get_dot_freq();
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private:
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uint8_t my_addr = 0;
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uint8_t reg_num = 0;
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int pos = 0;
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float xtal_freq = ATHENS_XTAL;
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uint8_t regs[ATHENS_NUM_REGS] = {};
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};
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#endif // ATHENS_H
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