2021-08-28 16:57:00 +00:00
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/* SmartyKit 1 - PS/2 keyboard driver v.1.1
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* (with automatic mode if no PS/2 keyboard is connected)
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2021-04-29 05:34:03 +00:00
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* http://www.smartykit.io/
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* Copyright (C) 2020, Sergey Panarin <sergey@smartykit.io>
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*
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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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#include "PS2Keyboard.h"
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// Keyboard Driver pins connections:
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// D0 & D1 – reserved for Serial connection
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// D2 –> PS/2 Socket Data pin
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// D3 -> 4-16 ports decoder Kbd (2) out pin (signal is active when CPU reads Keyboatrd port)
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// D4 -> PS/2 Socket Clk pin
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// D5 -> Keyboard BIT7 pin output
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// D6-D13 -> Keyboard data bus output (8 pins) to connect to Keyboard port (char code is transfered here)
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// A4 -> Low-rate clock output for CPU CLK input
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// A5 -> Low-rate clock output for indicating LED connection
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const int PS2Socket_Data = 2;
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const int CPUreadsKeyboardPin = 3;
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const int PS2Socket_Clk = 4;
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const int KeyboardBIT7pin = 5; //
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const int DataBus[8] = {6, 7, 8, 9, 10, 11, 12, 13};
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static boolean BIT7flag = false;
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2021-08-28 16:57:00 +00:00
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static boolean autoMode = true; //run pre-set command or wait for user input from PS/2 keyboard
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static boolean autoCommandSent = false; // run pre-set command only once after reboot of Keyboard controller
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2021-04-29 05:34:03 +00:00
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//low-rate clock for tests on A4-A5
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#define CLOCK A4
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#define LED A5
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int lowRateClockPeriod = 10; //10 milliseconds = 100 times per second (100 Hz)
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//#define _WITH_SERIAL_
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#define _WITH_PS2_
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#ifdef _WITH_PS2_
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PS2Keyboard keyboard;
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#endif
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void setup()
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{
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pinMode(CLOCK, OUTPUT);
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pinMode(LED, OUTPUT);
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pinMode(CPUreadsKeyboardPin, INPUT_PULLUP);
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for (int count = 1; count <= 8; count++) {
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pinMode(DataBus[count-1], OUTPUT);
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};
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pinMode(KeyboardBIT7pin, OUTPUT);
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KeyboardBIT7_Disable();
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2021-08-28 16:57:00 +00:00
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if (autoMode)
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delay(7500); //for start without Keyboard connected
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else
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delay(500);
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2021-04-29 05:34:03 +00:00
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#ifdef _WITH_PS2_
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keyboard.begin(PS2Socket_Clk, PS2Socket_Data);
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#endif
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attachInterrupt(1, cpuReadsKeyboard, FALLING);
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#ifdef _WITH_SERIAL_
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Serial.begin(9600);
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Serial.println("SmartyKit 1 Serial Keyboard is ready...");
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#endif
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}
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void cpuReadsKeyboard(void)
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{
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KeyboardBIT7_Disable();
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}
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void KeyboardBIT7_Enable()
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{
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digitalWrite(KeyboardBIT7pin, HIGH);
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BIT7flag = true;
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}
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void KeyboardBIT7_Disable()
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{
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digitalWrite(KeyboardBIT7pin, LOW);
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BIT7flag = false;
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}
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void sendCharToKeyboardPort(char c)
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{
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while(BIT7flag == true) //wait untill the previous char is read by CPU
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delay(5);
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for (int count = 1; count <= 8 ; count++)
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{
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if (c & (1 << (count-1)))
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digitalWrite(DataBus[count-1], HIGH);
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else
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digitalWrite(DataBus[count-1], LOW);
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}
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digitalWrite(DataBus[7], HIGH);
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KeyboardBIT7_Enable();
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}
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void loop() {
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2021-08-28 16:57:00 +00:00
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//run pre-set command in auto-mode when PS/2 keyboard is not connected
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//only once after reboot of Keyboard controller
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if (autoMode && !autoCommandSent)
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{
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autoCommandSent = true;
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runAutoModeCommand();
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}
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2021-04-29 05:34:03 +00:00
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#ifdef _WITH_PS2_
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//check PS2 input
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if (keyboard.available()) {
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char c = keyboard.read();
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if (c == PS2_TAB)
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2021-08-28 16:57:00 +00:00
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runCommand();
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2021-04-29 05:34:03 +00:00
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//process Backspace, Left Arrow, Delete as Apple I backspace '_'
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if (c == PS2_BACKSPACE) {
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c = '_';
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} else if (c == PS2_LEFTARROW) {
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c = '_';
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} else if (c == PS2_DELETE) {
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c = '_';
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}
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int scan_code = (int)c;
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2021-08-28 16:57:00 +00:00
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//make all symbols uppercase (from 'a' (ASCII code 0x61) to 'z' (ASCII code 0x7A))
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//as in original Apple-1
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if (scan_code >= 0x61 && scan_code <= 0x7A)
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2021-04-29 05:34:03 +00:00
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scan_code -= 0x20;
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c = (char) scan_code;
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//print c to Keyboard Port to be read by CPU
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sendCharToKeyboardPort(c);
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#ifdef _WITH_SERIAL_
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Serial.print(c);
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if (c == '\r')
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Serial.println();
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#endif
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}
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#endif
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//low-rate clock
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digitalWrite(CLOCK, HIGH);
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digitalWrite(LED, HIGH);
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delay(lowRateClockPeriod); // wait for a lowRateClockPeriod
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digitalWrite(CLOCK, LOW);
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digitalWrite(LED, LOW);
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delay(lowRateClockPeriod); // wait for a lowRateClockPeriod
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}
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2021-08-28 16:57:00 +00:00
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//running pre-set Woz OS command for auto mode
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void runAutoModeCommand()
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{
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const int CMD_COUNT = 1;
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String cmd1 = String("F000R\r"); // Woz face demo program at $F000
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String commands[] = {cmd1};
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for (int i = 0; i < CMD_COUNT; i++)
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for (int j = 0; j < commands[i].length(); j++)
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{
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char c = commands[i].charAt(j);
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sendCharToKeyboardPort(c);
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}
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}
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//running pre-set Woz OS command (drawing 8x8 pixel art)
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void runCommand()
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2021-04-29 05:34:03 +00:00
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{
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const int CMD_COUNT = 4;
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String cmd1 = String("1111: 88 A8 50\r");
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String cmd2 = String(":07 61 92\r");
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String cmd3 = String(":94 67\r");
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String cmd4 = String("FC00R\r");
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String commands[] = {cmd1, cmd2, cmd3, cmd4};
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for (int i = 0; i < CMD_COUNT; i++)
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for (int j = 0; j < commands[i].length(); j++)
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{
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char c = commands[i].charAt(j);
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sendCharToKeyboardPort(c);
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}
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}
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