mirror of
https://github.com/dingusdev/dingusppc.git
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102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 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 Enhanced Serial Communications Controller (ESCC) definitions. */
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#ifndef ESCC_H
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#define ESCC_H
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#include <cinttypes>
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#include <memory>
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#include <string>
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/** ESCC compatible (aka Macintosh legacy) register addressing */
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namespace Compat {
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enum EsccReg : uint8_t {
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Port_B_Cmd = 0,
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Port_A_Cmd = 1,
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Port_B_Data = 2,
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Port_A_Data = 3,
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Enh_Reg_B = 4,
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Enh_Reg_A = 5,
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};
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};
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/** ESCC MacRISC style register addressing */
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enum EsccReg : uint8_t {
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Port_B_Cmd = 0,
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Port_B_Data = 1,
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Port_A_Cmd = 2,
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Port_A_Data = 3,
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Enh_Reg_B = 4,
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Enh_Reg_A = 5,
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};
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/** LocalTalk registers (same in both addressing schemes) */
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enum LocalTalkReg : uint8_t {
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Rec_Count = 8,
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Start_A = 9,
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Start_B = 0xA,
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Detect_AB = 0xB,
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};
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enum WR0Cmd : uint8_t {
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Point_High = 1,
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};
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/** ESCC Channel class. */
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class EsccChannel {
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public:
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EsccChannel(std::string name) { this->name = name; };
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~EsccChannel() = default;
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void write_reg(int reg_num, uint8_t value);
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private:
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std::string name;
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uint8_t write_regs[16];
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};
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/** ESCC Controller class. */
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class EsccController {
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public:
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EsccController();
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~EsccController() = default;
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// ESCC MacRISC registers access
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uint8_t read(uint8_t reg_offset);
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void write(uint8_t reg_offset, uint8_t value);
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// ESCC compatible registers access
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uint8_t read_compat(uint8_t reg_offset);
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void write_compat(uint8_t reg_offset, uint8_t value);
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private:
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void write_internal(EsccChannel* ch, uint8_t value);
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std::unique_ptr<EsccChannel> ch_a;
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std::unique_ptr<EsccChannel> ch_b;
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int reg_ptr; // register pointer for reading/writing (same for both channels)
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};
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#endif // ESCC_H
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