94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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 Base class for Apple Desktop Bus devices. */
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#include <core/timermanager.h>
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#include <devices/common/adb/adbdevice.h>
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#include <devices/common/adb/adbbus.h>
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#include <machines/machinebase.h>
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AdbDevice::AdbDevice(std::string name) {
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this->set_name(name);
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this->supports_types(HWCompType::ADB_DEV);
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}
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int AdbDevice::device_postinit() {
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// register itself with the ADB host
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this->host_obj = dynamic_cast<AdbBus*>(gMachineObj->get_comp_by_type(HWCompType::ADB_HOST));
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this->host_obj->register_device(this);
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return 0;
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};
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bool AdbDevice::talk(const uint8_t dev_addr, const uint8_t reg_num) {
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if (dev_addr == this->my_addr && !this->got_collision) {
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// see if another device already responded to this command
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if (this->host_obj->already_answered()) {
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this->got_collision = true;
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return false;
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}
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switch(reg_num & 3) {
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case 0:
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return this->get_register_0();
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case 1:
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return this->get_register_1();
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case 2:
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return this->get_register_2();
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case 3:
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return this->get_register_3();
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default:
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return false;
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}
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} else {
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return false;
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}
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}
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void AdbDevice::listen(const uint8_t dev_addr, const uint8_t reg_num) {
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if (dev_addr == this->my_addr) {
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switch(reg_num & 3) {
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case 0:
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this->set_register_0();
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case 1:
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this->set_register_1();
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case 2:
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this->set_register_2();
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case 3:
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this->set_register_3();
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}
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}
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}
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bool AdbDevice::get_register_3() {
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uint8_t* out_buf = this->host_obj->get_output_buf();
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out_buf[0] = this->gen_random_address() | (this->exc_event_flag << 6) |
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(this->srq_flag << 5);
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out_buf[1] = this->dev_handler_id;
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this->host_obj->set_output_count(2);
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return true;
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}
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uint8_t AdbDevice::gen_random_address() {
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return (TimerManager::get_instance()->current_time_ns() + 8) & 0xF;
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}
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