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/* Copyright 2021 Frank Adams
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// This software implements a Powerbook 140-180 Laptop Keyboard Controller using a
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// Teensy 3.2 on a daughterboard with 16 and 14 pin connectors.
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// The TB section of code is from this post:
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// https://imgur.com/a/BQjt9le
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//
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// Revision History
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// Initial Release June 23, 2021
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//
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#define CAPS_LED 13 // Teensy LED shows Caps-Lock
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#define ADB_DATA_PIN 5 // TB bidirectional data pin
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//
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const byte rows_max = 16; // sets the number of rows in the matrix
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const byte cols_max = 8; // sets the number of columns in the matrix
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//
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// Load the normal key matrix with the Teensyduino key names described at www.pjrc.com/teensy/td_keyboard.html
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// A zero indicates no normal key at that location.
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//
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int normal[rows_max][cols_max] = {
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{0,KEY_7,KEY_8,KEY_RIGHT_BRACE,KEY_BACKSLASH,KEY_9,KEY_QUOTE,KEY_6},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,KEY_ESC},
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{0,KEY_1,KEY_2,KEY_I,KEY_H,KEY_3,KEY_BACKSPACE,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,KEY_TAB,KEY_A,0,KEY_LEFT,0},
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{KEY_Z,0,0,KEY_Q,KEY_S,0,0,0},
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{KEY_X,0,0,KEY_W,KEY_DOWN,0,KEY_UP,0},
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{KEY_C,0,0,KEY_E,0,0,KEY_D,0},
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{KEY_V,0,0,KEY_R,KEY_F,0,KEY_RIGHT,0},
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{KEY_N,KEY_TILDE,KEY_G,KEY_K,KEY_J,KEY_BACKSLASH,KEY_L,KEY_4},
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{KEY_M,KEY_T,KEY_Y,KEY_P,KEY_COMMA,KEY_LEFT_BRACE,KEY_SEMICOLON,KEY_5},
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{0,KEY_MINUS,KEY_0,0,KEY_PERIOD,KEY_O,KEY_ENTER,KEY_EQUAL},
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{KEY_SPACE,0,0,KEY_DELETE,KEY_B,0,KEY_U,0}
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};
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// Initialize the old_key matrix with one's.
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// 1 = key not pressed, 0 = key is pressed
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boolean old_key[rows_max][cols_max] = {
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1}
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};
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// initialize old special keys to "not pressed"
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boolean old_CAPS_LOCK = 1;
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boolean old_CTRL = 1;
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boolean old_ALT = 1;
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boolean old_SHIFT = 1;
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//
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// Define the Teensy 3.2 I/O numbers (translated from the FPC pin #)
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// Row FPC pin # 01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16
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// Teensy I/O # 12,14,15,16,17,18,19,20,21,22,23,04,03,02,01,00
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int Row_IO[rows_max] = {12,14,15,16,17,18,19,20,21,22,23,4,3,2,1,0}; // Teensy 3.2 I/O numbers for rows
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//
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// Column FPC pin # 18,19,20,21,22,23,24,25 // FPC 17 is tied to ground
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// Teensy I/O # 24,25,26,27,28,29,30,31 // Teensy I/O#6 is not used
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int Col_IO[cols_max] = {24,25,26,27,28,29,30,31}; // Teensy 3.2 I/O numbers for columns
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// Declare variables that will be used by functions
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boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys
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// slot 1 thru slot 6 hold the normal key values to be sent over USB.
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int slot1 = 0; //value of 0 means the slot is empty and can be used.
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int slot2 = 0;
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int slot3 = 0;
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int slot4 = 0;
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int slot5 = 0;
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int slot6 = 0;
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//
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int mod_shift_l = 0; // These variables are sent over USB as modifier keys.
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int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ...
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int mod_ctrl_l = 0;
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int mod_ctrl_r = 0;
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int mod_alt_l = 0;
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int mod_alt_r = 0;
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int mod_gui = 0;
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//
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// TB Constants
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int dat = 0;
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int ADB_TIMEOUT = 10000;
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// TB Functions
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static void send_0bit() {
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(65);
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digitalWrite(ADB_DATA_PIN, HIGH);
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delayMicroseconds(35);
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}
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static void send_1bit() {
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(35);
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digitalWrite(ADB_DATA_PIN, HIGH);
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delayMicroseconds(65);
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}
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static void attn() {
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//delay(1);
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(800-35);
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send_0bit();
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}
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void send_talk_command() {
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//attn
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pinMode(ADB_DATA_PIN, OUTPUT);
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attn();
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//address (3) 0011
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//0
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send_0bit();
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send_0bit();
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send_1bit();
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send_1bit();
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//talk 11
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send_1bit();
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send_1bit();
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//register 00
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send_0bit();
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send_0bit();
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//stop bit
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send_0bit();
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//start to stop time
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delayMicroseconds(140);
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}
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int receive_data_packet() {
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pinMode(ADB_DATA_PIN, INPUT);
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int data_time = 0;
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bool command_stop = false;
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int adb_data = 0;
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//begin reading ADB datapin
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while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
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//wait for beginning of start bit
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data_time+=1;
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delayMicroseconds(1);
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}
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while(digitalRead(ADB_DATA_PIN)!=HIGH && data_time < ADB_TIMEOUT){
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//wait for end of start bit
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data_time+=1;
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delayMicroseconds(1);
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}
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while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
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//wait for beginning of first data bit
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data_time+=1;
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delayMicroseconds(1);
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}
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//data packet
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data_time = 0;
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while(!command_stop && data_time < ADB_TIMEOUT) {
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int low = 0;
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int high = 0;
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bool bit_stop = false;
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while(!bit_stop && data_time < ADB_TIMEOUT) {
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int adb_stream = digitalRead(ADB_DATA_PIN);
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if(adb_stream == LOW) low+=1;
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if(adb_stream == HIGH) high+=1;
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if(adb_stream == LOW && high > 0) bit_stop = true;
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if(high > 240){
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bit_stop = true;
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break;
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}
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data_time+=1;
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delayMicroseconds(1);
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}
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if(high > 240){
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command_stop = true;
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}
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//append the new data bit to adb_data
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if(high > low && !command_stop) adb_data = (adb_data << 1) + 1;
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if(low > high && !command_stop) adb_data = adb_data << 1;
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}
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//stop bit
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return adb_data;
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}
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/*data bits:
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* [c][x][x][x][x][x][x][x][c2][y][y][y][y][y][y][y]
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*/
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void parse_data(int data) {
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if(data !=0) {
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int mousex = data & 0b0000000001111111;
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int mousey = (data >> 8) & 0b01111111;
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//the mouse value is
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//7 bit two's complement
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if((mousey & 0b1000000) != 0) {
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mousey = ((~mousey + 1) & 0b01111111) * -1;
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}
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if((mousex & 0b1000000) != 0) {
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mousex = ((~mousex + 1) & 0b01111111) * -1;
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}
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Mouse.move(mousex, mousey);
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Mouse.move(mousex, mousey);
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int mouseClick = data & 0b1000000000000000;
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if(mouseClick == 0) {
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Mouse.set_buttons(1,0,0);
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}
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else if(mouseClick != 0) {
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Mouse.set_buttons(0,0,0);
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}
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}
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}
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// Function to load the key name into the first available slot
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void load_slot(int key) {
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if (!slot1) {
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slot1 = key;
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}
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else if (!slot2) {
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slot2 = key;
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}
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else if (!slot3) {
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slot3 = key;
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}
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else if (!slot4) {
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slot4 = key;
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}
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else if (!slot5) {
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slot5 = key;
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}
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else if (!slot6) {
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slot6 = key;
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}
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if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) {
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slots_full = LOW; // slots are not full
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}
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else {
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slots_full = HIGH; // slots are full
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}
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}
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//
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// Function to clear the slot that contains the key name
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void clear_slot(int key) {
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if (slot1 == key) {
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slot1 = 0;
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}
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else if (slot2 == key) {
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slot2 = 0;
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}
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else if (slot3 == key) {
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slot3 = 0;
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}
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else if (slot4 == key) {
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slot4 = 0;
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}
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else if (slot5 == key) {
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slot5 = 0;
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}
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else if (slot6 == key) {
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slot6 = 0;
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}
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if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) {
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slots_full = LOW; // slots are not full
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}
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else {
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slots_full = HIGH; // slots are full
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}
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}
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//
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// Function to load the modifier key name into the appropriate mod variable
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void load_mod(int m_key) {
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if (m_key == MODIFIERKEY_LEFT_SHIFT) {
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mod_shift_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
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mod_shift_r = m_key;
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}
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else if (m_key == MODIFIERKEY_LEFT_CTRL) {
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mod_ctrl_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
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mod_ctrl_r = m_key;
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}
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else if (m_key == MODIFIERKEY_LEFT_ALT) {
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mod_alt_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_ALT) {
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mod_alt_r = m_key;
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}
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else if (m_key == MODIFIERKEY_GUI) {
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mod_gui = m_key;
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}
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}
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//
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// Function to load 0 into the appropriate mod variable
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void clear_mod(int m_key) {
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if (m_key == MODIFIERKEY_LEFT_SHIFT) {
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mod_shift_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
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mod_shift_r = 0;
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}
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else if (m_key == MODIFIERKEY_LEFT_CTRL) {
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mod_ctrl_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
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mod_ctrl_r = 0;
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}
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else if (m_key == MODIFIERKEY_LEFT_ALT) {
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mod_alt_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_ALT) {
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mod_alt_r = 0;
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}
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else if (m_key == MODIFIERKEY_GUI) {
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mod_gui = 0;
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}
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}
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//
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// Function to send the modifier keys over usb
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void send_mod() {
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Keyboard.set_modifier(mod_shift_l | mod_shift_r | mod_ctrl_l | mod_ctrl_r | mod_alt_l | mod_alt_r | mod_gui);
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Keyboard.send_now();
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}
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//
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// Function to send the normal keys in the 6 slots over usb
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void send_normals() {
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Keyboard.set_key1(slot1);
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Keyboard.set_key2(slot2);
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Keyboard.set_key3(slot3);
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Keyboard.set_key4(slot4);
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Keyboard.set_key5(slot5);
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Keyboard.set_key6(slot6);
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Keyboard.send_now();
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}
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//
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// Function to set a pin to high impedance (acts like open drain output)
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void go_z(int pin)
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{
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pinMode(pin, INPUT);
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digitalWrite(pin, HIGH);
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}
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//
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// Function to set a pin as an input with a pullup
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void go_pu(int pin)
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{
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pinMode(pin, INPUT_PULLUP);
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digitalWrite(pin, HIGH);
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}
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//
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// Function to send a pin to a logic low
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void go_0(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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}
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//
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// Function to send a pin to a logic high
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void go_1(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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}
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//
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//----------------------------------Setup-------------------------------------------
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void setup() {
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for (int a = 0; a < cols_max; a++) { // loop thru all column pins
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go_pu(Col_IO[a]); // set each column pin as an input with a pullup
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}
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//
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for (int b = 0; b < rows_max; b++) { // loop thru all row pins
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go_z(Row_IO[b]); // set each row pin as a floating output
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}
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}
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//
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boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed"
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extern volatile uint8_t keyboard_leds; // 8 bits sent from Host to Teensy that give keyboard LED status. Caps lock is bit D1.
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//
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//---------------------------------Main Loop---------------------------------------------
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//
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void loop() {
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// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups).
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// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan
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// that was 30msec ago. The status of a key that was just pressed or just released is sent over USB and the state is saved in the old_key matrix.
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// The keyboard keys will read as logic low if they are pressed (negative logic).
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// The old_key matrix also uses negative logic (low=pressed).
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//
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for (int x = 0; x < rows_max; x++) { // loop thru the rows
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go_0(Row_IO[x]); // Activate Row (send it low)
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delayMicroseconds(10); // give the row time to go low and settle out
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for (int y = 0; y < cols_max; y++) { // loop thru the columns
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//
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// ***********Normal keys in this section
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if (normal[x][y] != 0) { // check if normal key exists at this location in the array
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if (!digitalRead(Col_IO[y]) && (old_key[x][y]) && (!slots_full)) { // check if key pressed and not previously pressed and slots not full
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old_key[x][y] = LOW; // Save state of key as "pressed"
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load_slot(normal[x][y]); //update first available slot with normal key name
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send_normals(); // send all slots over USB including the key that just got pressed
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}
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else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed
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old_key[x][y] = HIGH; // Save state of key as "not pressed"
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clear_slot(normal[x][y]); //clear the slot that contains the normal key name
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send_normals(); // send all slots over USB including the key that was just released
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}
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}
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}
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go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
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}
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// **********Normal keyboard scan complete
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//
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// **********Modifier and Caps Lock keys have their own column that is tied to ground. The rows for these keys are
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// turned into inputs with pullups to see if a key is pressed, then returned to floating outputs for the next loop.
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//
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// Control Key
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go_pu(Row_IO[1]); // Read MODIFIERKEY_CTRL on Row 1. The column is always grounded
|
||||
if (!digitalRead(Row_IO[1]) && (old_CTRL)) { // check if key is pressed and was not pressed last time
|
||||
mod_ctrl_l = MODIFIERKEY_CTRL;
|
||||
send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
|
||||
old_CTRL = LOW; // Save state of key as "pressed"
|
||||
}
|
||||
else if (digitalRead(Row_IO[1]) && (!old_CTRL)) { //check if key is not pressed and was previously pressed
|
||||
mod_ctrl_l = 0;
|
||||
send_mod(); // function sends all mod's over usb including the one that just released
|
||||
old_CTRL = HIGH; // old_key state is "not pressed"
|
||||
}
|
||||
go_z(Row_IO[1]); // return this row pin to a floating output for the next loop
|
||||
// Alt Key
|
||||
go_pu(Row_IO[2]); // Read MODIFIERKEY_ALT on Row 2. The column is always grounded
|
||||
if (!digitalRead(Row_IO[2]) && (old_ALT)) { // check if key is pressed and was not pressed last time
|
||||
mod_alt_l = MODIFIERKEY_ALT;
|
||||
send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
|
||||
old_ALT = LOW; // Save state of key as "pressed"
|
||||
}
|
||||
else if (digitalRead(Row_IO[2]) && (!old_ALT)) { //check if key is not pressed and was previously pressed
|
||||
mod_alt_l = 0;
|
||||
send_mod(); // function sends all mod's over usb including the one that just released
|
||||
old_ALT = HIGH; // old_key state is "not pressed"
|
||||
}
|
||||
go_z(Row_IO[2]); // return this row pin to a floating output for the next loop
|
||||
// Shift Key
|
||||
go_pu(Row_IO[3]); // Read MODIFIERKEY_SHIFT on Row 3. The column is always grounded
|
||||
if (!digitalRead(Row_IO[3]) && (old_SHIFT)) { // check if key is pressed and was not pressed last time
|
||||
mod_shift_l = MODIFIERKEY_SHIFT;
|
||||
send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
|
||||
old_SHIFT = LOW; // Save state of key as "pressed"
|
||||
}
|
||||
else if (digitalRead(Row_IO[3]) && (!old_SHIFT)) { //check if key is not pressed and was previously pressed
|
||||
mod_shift_l = 0;
|
||||
send_mod(); // function sends all mod's over usb including the one that just released
|
||||
old_SHIFT = HIGH; // old_key state is "not pressed"
|
||||
}
|
||||
go_z(Row_IO[3]); // return this row pin to a floating output for the next loop
|
||||
// Caps Lock Key
|
||||
go_pu(Row_IO[5]); // Read KEY_CAPS_LOCK on Row 5. The column is always grounded
|
||||
if ((!digitalRead(Row_IO[5])) && (old_CAPS_LOCK) && (!slots_full)) { // check if key is pressed and was not pressed last time and slots are not full
|
||||
load_slot(KEY_CAPS_LOCK); //update first available slot with key name
|
||||
send_normals(); // send all slots over USB including the key that just got pressed
|
||||
old_CAPS_LOCK = LOW; // Save state of key as "pressed"
|
||||
}
|
||||
else if (digitalRead(Row_IO[5]) && (!old_CAPS_LOCK)) { //check if key is not pressed and was previously pressed
|
||||
clear_slot(KEY_CAPS_LOCK); //clear the slot that contains the normal key name
|
||||
send_normals(); // send all slots over USB including the key that was just released
|
||||
old_CAPS_LOCK = HIGH; // old_key state is "not pressed"
|
||||
}
|
||||
go_z(Row_IO[5]); // return this row pin to a floating output for the next loop
|
||||
// ***********end of modifier and Caps Lock section
|
||||
//
|
||||
// ************TB***********************************
|
||||
send_talk_command();
|
||||
dat = receive_data_packet();
|
||||
parse_data(dat);
|
||||
// ***********end of TB******************************
|
||||
//
|
||||
// Turn on the LED on the Teensy for Caps Lock based on bit 1 in the keyboard_leds variable controlled by the USB host computer
|
||||
//
|
||||
if (keyboard_leds & 1<<1) { // mask off all bits but D1 and test if set
|
||||
go_1(CAPS_LED); // turn on the LED
|
||||
}
|
||||
else {
|
||||
go_0(CAPS_LED); // turn off the LED
|
||||
}
|
||||
//
|
||||
delay(15); // The overall keyboard scanning rate is about 30ms
|
||||
}
|
||||
Loading…
Reference in a new issue