mirror of
https://github.com/dingusdev/dingusppc.git
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123 lines
3.4 KiB
C++
123 lines
3.4 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) emulation. */
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#include "escc.h"
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#include <loguru.hpp>
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#include <cinttypes>
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#include <memory>
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EsccController::EsccController()
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{
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this->ch_a = std::unique_ptr<EsccChannel> (new EsccChannel("A"));
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this->ch_b = std::unique_ptr<EsccChannel> (new EsccChannel("B"));
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this->reg_ptr = 0;
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}
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uint8_t EsccController::read(uint8_t reg_offset)
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{
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switch(reg_offset) {
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case EsccReg::Port_B_Cmd:
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LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
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this->reg_ptr = 0;
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break;
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case EsccReg::Port_A_Cmd:
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LOG_F(9, "ESCC: reading Port A register RR%d", this->reg_ptr);
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this->reg_ptr = 0;
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break;
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default:
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LOG_F(INFO, "ESCC: reading register %d", reg_offset);
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}
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return 0;
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}
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void EsccController::write(uint8_t reg_offset, uint8_t value)
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{
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switch(reg_offset) {
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case EsccReg::Port_B_Cmd:
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this->write_internal(this->ch_b.get(), value);
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break;
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case EsccReg::Port_A_Cmd:
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this->write_internal(this->ch_a.get(), value);
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break;
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default:
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LOG_F(INFO, "ESCC: writing 0x%X to register %d", value, reg_offset);
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}
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}
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uint8_t EsccController::read_compat(uint8_t reg_offset)
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{
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switch(reg_offset) {
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case Compat::EsccReg::Port_B_Cmd:
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LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
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this->reg_ptr = 0;
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break;
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case Compat::EsccReg::Port_A_Cmd:
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LOG_F(9, "ESCC: reading Port A register RR%d", this->reg_ptr);
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this->reg_ptr = 0;
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break;
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default:
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LOG_F(INFO, "ESCC: reading register %d", reg_offset);
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}
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return 0;
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}
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void EsccController::write_compat(uint8_t reg_offset, uint8_t value)
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{
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switch(reg_offset) {
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case Compat::EsccReg::Port_B_Cmd:
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this->write_internal(this->ch_b.get(), value);
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break;
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case Compat::EsccReg::Port_A_Cmd:
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this->write_internal(this->ch_a.get(), value);
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break;
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default:
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LOG_F(INFO, "ESCC: writing 0x%X to register %d", value, reg_offset);
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}
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}
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void EsccController::write_internal(EsccChannel *ch, uint8_t value)
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{
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if (this->reg_ptr) {
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ch->write_reg(this->reg_ptr, value);
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this->reg_ptr = 0;
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} else {
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this->reg_ptr = value & 7;
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switch(value >> 3) {
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case WR0Cmd::Point_High:
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this->reg_ptr |= 8;
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break;
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}
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}
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}
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void EsccChannel::write_reg(int reg_num, uint8_t value)
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{
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this->write_regs[reg_num] = value;
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LOG_F(9, "ESCC: writing 0x%X to Channel %s WR%d", value, this->name.c_str(),
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reg_num);
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}
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