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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//
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// Keyboard.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 20/03/2024.
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// Copyright © 2024 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "HalfDuplexSerial.hpp"
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namespace Archimedes {
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// Resource for the keyboard protocol: https://github.com/tmk/tmk_keyboard/wiki/ACORN-ARCHIMEDES-Keyboard
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struct Keyboard {
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Keyboard(HalfDuplexSerial &serial) : serial_(serial) {}
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void update() {
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if(serial_.events(KeyboardParty) & HalfDuplexSerial::Receive) {
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const uint8_t input = serial_.input(KeyboardParty);
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switch(input) {
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case HRST:
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// TODO:
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case RAK1:
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case RAK2:
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serial_.output(KeyboardParty, input);
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break;
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case RQID:
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serial_.output(KeyboardParty, 0x81); // TODO: what keyboard type?
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break;
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default:
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printf("Keyboard declines to respond to %02x\n", input);
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break;
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}
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}
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}
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private:
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HalfDuplexSerial &serial_;
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static constexpr uint8_t HRST = 0b1111'1111; // Keyboard reset.
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static constexpr uint8_t RAK1 = 0b1111'1110; // Reset response #1.
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static constexpr uint8_t RAK2 = 0b1111'1101; // Reset response #2.
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static constexpr uint8_t RQID = 0b0010'0000; // Request for keyboard ID.
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static constexpr uint8_t RQMP = 0b0010'0010; // Request for mouse data.
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static constexpr uint8_t BACK = 0b0011'1111; // Acknowledge for first keyboard data byte pair.
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static constexpr uint8_t NACK = 0b0011'0000; // Acknowledge for last keyboard data byte pair, selects scan/mouse mode.
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static constexpr uint8_t SACK = 0b0011'0001; // Last data byte acknowledge.
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static constexpr uint8_t MACK = 0b0011'0010; // Last data byte acknowledge.
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static constexpr uint8_t SMAK = 0b0011'0011; // Last data byte acknowledge.
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static constexpr uint8_t PRST = 0b0010'0001; // Does nothing.
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};
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}
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