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/* Copyright 2019 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 an Apple iBook clamshell Keyboard Controller and PS/2 Touchpad Controller
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// using a Teensy 3.2 on a daughterboard with a two row forty pin female vertical socket with a 1.27mm pitch.
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// The touchpad replaces the original serial touchpad of the iBook with one from a Dell Inspiron 2500 PP02L Laptop.
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// The touchpad part number is TM41PDD233. This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
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// keys over USB. Multi-media keys are sent with keyboard press and release functions.
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// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html
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// The PS/2 code has a watchdog timer so the code doesn't hang if the Teensy is interrupted by USB traffic.
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//
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// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick
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//
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// Revision History
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// Rev 1.0 - Sept 21, 2021 - Original Release
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//
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//
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#define MODIFIERKEY_FN 0x8f // give Fn key a HID code
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#define CAPS_LED 21 // Caps lock LED on keyboard shows bit 1 in keyboard_led variable
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#define SCRL_LED 20 // Scroll lock LED on keyboard shows bit 2 in keyboard_leds variable
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#define NUM_LED 19 // Num lock LED on keyboard shows bit 0 in keyboard_leds variable
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#define HEARTBEAT_LED 13 // LED on Teensy blinks to show its alive
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//
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#define TP_DATA 17 // Touchpad ps/2 data connected to Teensy I/O pin 14
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#define TP_CLK 18 // Touchpad ps/2 clock connected to Teensy I/O pin 23
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//
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//
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const byte rows_max = 15; // sets the number of rows in the matrix
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const byte cols_max = 11; // 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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{0,0,0,0,0,0,0,0,0,0,0},
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{KEY_9,KEY_8,KEY_1,KEY_0,KEY_7,KEY_6,KEY_5,0,KEY_4,KEY_3,KEY_2},
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{KEY_O,KEY_I,KEY_Q,KEY_P,KEY_U,KEY_Y,KEY_T,0,KEY_R,KEY_E,KEY_W},
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{KEY_L,KEY_K,KEY_A,KEY_SEMICOLON,KEY_J,KEY_H,KEY_G,0,KEY_F,KEY_D,KEY_S},
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{KEY_PERIOD,KEY_COMMA,KEY_Z,KEY_SLASH,KEY_M,KEY_N,KEY_B,0,KEY_V,KEY_C,KEY_X},
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{0,0,0,0,0,0,0,0,0,0,0},
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{KEY_DOWN,KEY_LEFT,KEY_BACKSPACE,KEY_RIGHT_BRACE,0,KEY_SPACE,KEY_QUOTE,0,0,0,KEY_TAB},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{KEY_UP,KEY_RIGHT,KEY_F12,KEY_EQUAL,0,0,KEY_LEFT_BRACE,0,KEY_CAPS_LOCK,0,KEY_TILDE},
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{KEY_F9,KEY_F8,KEY_F1,KEY_F10,KEY_F7,KEY_F6,KEY_F5,0,KEY_F4,KEY_F3,KEY_F2},
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{KEY_BACKSLASH,0,KEY_F11,KEY_ENTER,0,0,KEY_MINUS,0,0,0,KEY_ESC},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0}
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};
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// Load the modifier key matrix with key names at the correct row-column location.
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// A zero indicates no modifier key at that location.
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int modifier[rows_max][cols_max] = {
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{0,0,0,0,0,0,0,MODIFIERKEY_RIGHT_SHIFT,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_RIGHT_ALT,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_LEFT_SHIFT,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_LEFT_CTRL,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_GUI,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_LEFT_ALT,0,0,0},
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{0,0,0,0,0,0,0,MODIFIERKEY_FN,0,0,0}
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};
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// Load the media key matrix with Fn key names at the correct row-column location.
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// Notice the volume controls need the Fn key pressed.
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// A zero indicates no media key at that location.
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int media[rows_max][cols_max] = {
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{0,0,0,0,0,0,0,0,0,0,0},
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{KEYPAD_9,KEYPAD_8,0,KEYPAD_SLASH,KEYPAD_7,0,0,0,0,0,0},
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{KEYPAD_6,KEYPAD_5,0,KEYPAD_ASTERIX,KEYPAD_4,0,0,0,0,0,0},
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{KEYPAD_3,KEYPAD_2,0,KEYPAD_MINUS,KEYPAD_1,0,0,0,0,0,0},
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{KEYPAD_PERIOD,0,0,KEYPAD_PLUS,KEYPAD_0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{KEY_PAGE_DOWN,KEY_HOME,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{KEY_PAGE_UP,KEY_END,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,KEY_NUM_LOCK,0,0,0,0},
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{0,0,0,KEYPAD_ENTER,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0}
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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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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1}
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};
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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 # 06,07,08,09,10,11,12,13,14,15,16,17,18,19,20
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// Teensy I/O # 01,02,03,04,05,06,07,08,09,10,11,12,14,15,16
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int Row_IO[rows_max] = {1,2,3,4,5,6,7,8,9,10,11,12,14,15,16}; // Teensy 3.2 I/O numbers for rows
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//
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// Column FPC pin # 21,01,24,25,26,27,28,29,32,33,34
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// Teensy I/O # 24,00,25,26,27,28,29,30,31,32,33
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int Col_IO[cols_max] = {24,0,33,32,26,31,29,28,30,27,25}; // 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 touchpad_error = LOW; // set high if the touchpad failes to give the correct response
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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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// 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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slots_full = LOW;
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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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// *****************Functions for Touchpad***************************
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//
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// Function to send the touchpad a byte of data (command)
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//
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void tp_write(char send_data)
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{
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unsigned int timeout = 200; // breakout of loop if over this value in msec
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elapsedMillis watchdog; // zero the watchdog timer clock
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char odd_parity = 0; // clear parity bit count
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// Enable the bus by floating the clock and data
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go_pu(TP_CLK); //
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go_pu(TP_DATA); //
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delayMicroseconds(250); // wait before requesting the bus
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go_0(TP_CLK); // Send the Clock line low to request to transmit data
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delayMicroseconds(100); // wait for 100 microseconds per bus spec
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go_0(TP_DATA); // Send the Data line low (the start bit)
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delayMicroseconds(1); //
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go_pu(TP_CLK); // Release the Clock line so it is pulled high
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delayMicroseconds(1); // give some time to let the clock line go high
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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// touchpad_error = HIGH; // set error flag
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break; // break out of infinite loop
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}
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}
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// send the 8 bits of send_data
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for (int j=0; j<8; j++) {
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if (send_data & 1) { //check if lsb is set
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go_pu(TP_DATA); // send a 1 to TP
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odd_parity = odd_parity + 1; // keep running total of 1's sent
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}
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else {
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go_0(TP_DATA); // send a 0 to TP
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
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send_data = send_data >> 1; // shift data right by 1 to prepare for next loop
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}
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// send the parity bit
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if (odd_parity & 1) { //check if lsb of parity is set
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go_0(TP_DATA); // already odd so send a 0 to TP
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}
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else {
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go_pu(TP_DATA); // send a 1 to TP to make parity odd
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
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go_pu(TP_DATA); // Release the Data line so it goes high as the stop bit
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delayMicroseconds(80); // testing shows delay at least 40us
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
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delayMicroseconds(1); // wait to let the data settle
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if (digitalRead(TP_DATA)) { // Ack bit s/b low if good transfer
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}
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while ((digitalRead(TP_CLK) == LOW) || (digitalRead(TP_DATA) == LOW)) { // loop if clock or data are low
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if (watchdog >= timeout) { //check for infinite loop
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break; // break out of infinite loop
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}
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}
|
||||
// Inhibit the bus so the tp only talks when we're listening
|
||||
go_0(TP_CLK);
|
||||
}
|
||||
//
|
||||
// Function to get a byte of data from the touchpad
|
||||
//
|
||||
char tp_read(void)
|
||||
{
|
||||
unsigned int timeout = 200; // breakout of loop if over this value in msec
|
||||
elapsedMillis watchdog; // zero the watchdog timer clock
|
||||
char rcv_data = 0; // initialize to zero
|
||||
char mask = 1; // shift a 1 across the 8 bits to select where to load the data
|
||||
char rcv_parity = 0; // count the ones received
|
||||
go_pu(TP_CLK); // release the clock
|
||||
go_pu(TP_DATA); // release the data
|
||||
delayMicroseconds(5); // delay to let clock go high
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
if (digitalRead(TP_DATA)) { // Start bit s/b low from tp
|
||||
// start bit not correct - put error handler here if desired
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
for (int k=0; k<8; k++) {
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
if (digitalRead(TP_DATA)) { // check if data is high
|
||||
rcv_data = rcv_data | mask; // set the appropriate bit in the rcv data
|
||||
rcv_parity++; // increment the parity bit counter
|
||||
}
|
||||
mask = mask << 1;
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
}
|
||||
// receive parity
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
if (digitalRead(TP_DATA)) { // check if received parity is high
|
||||
rcv_parity++; // increment the parity bit counter
|
||||
}
|
||||
rcv_parity = rcv_parity & 1; // mask off all bits except the lsb
|
||||
if (rcv_parity == 0) { // check for bad (even) parity
|
||||
// bad parity - pass to future error handler
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// stop bit
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
if (digitalRead(TP_DATA) == LOW) { // check if stop bit is bad (low)
|
||||
// send bad stop bit to future error handler
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// Inhibit the bus so the tp only talks when we're listening
|
||||
go_0(TP_CLK);
|
||||
return rcv_data; // pass the received data back
|
||||
}
|
||||
//
|
||||
void touchpad_init()
|
||||
{
|
||||
touchpad_error = LOW; // start with no error
|
||||
go_pu(TP_CLK); // float the clock and data to touchpad
|
||||
go_pu(TP_DATA);
|
||||
// Sending reset command to touchpad
|
||||
tp_write(0xff);
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
delay(350); // wait 350ms so tp can run its self diagnostic
|
||||
// verify proper response from tp
|
||||
if (tp_read() != 0xaa) { // verify basic assurance test passed
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
if (tp_read() != 0x00) { // verify basic assurance test passed
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
// increase resolution from 4 counts/mm to 8 counts/mm
|
||||
tp_write(0xe8); // Sending resolution command
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
tp_write(0x03); // value of 03 = 8 counts/mm resolution (default is 4 counts/mm)
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
// Sending remote mode code so the touchpad will send data only when polled
|
||||
tp_write(0xf0); // remote mode
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
}
|
||||
//----------------------------------Setup-------------------------------------------
|
||||
void setup() {
|
||||
pinMode(HEARTBEAT_LED, OUTPUT);
|
||||
go_1(NUM_LED); // Turn off all LEDs
|
||||
go_1(CAPS_LED);
|
||||
go_1(SCRL_LED);
|
||||
for (int a = 0; a < cols_max; a++) { // loop thru all column pins
|
||||
go_pu(Col_IO[a]); // set each column pin as an input with a pullup
|
||||
}
|
||||
//
|
||||
for (int b = 0; b < rows_max; b++) { // loop thru all row pins
|
||||
go_z(Row_IO[b]); // set each row pin as a floating output
|
||||
}
|
||||
touchpad_init(); // reset touchpad, set resolution and put it in remote mode. Set touchpad_error if bad response from tp
|
||||
}
|
||||
//
|
||||
boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed"
|
||||
extern volatile uint8_t keyboard_leds; // 8 bits sent from Host to Teensy that give keyboard caps, num, and scroll lock LED status.
|
||||
char blink_count = 0; // Blink loop counter
|
||||
boolean blinky = HIGH; // Blink LED state
|
||||
//
|
||||
// declare and initialize touchpad variables
|
||||
char mstat; // touchpad status reg = Y overflow, X overflow, Y sign bit, X sign bit, Always 1, Middle Btn, Right Btn, Left Btn
|
||||
char mx; // touchpad x movement = 8 data bits. The sign bit is in the status register to
|
||||
// make a 9 bit 2's complement value. Left to right on the touchpad gives a positive value.
|
||||
char my; // touchpad y movement also 8 bits plus sign. Touchpad movement away from the user gives a positive value.
|
||||
boolean over_flow; // set if x or y movement values are bad due to overflow
|
||||
boolean left_button = 0; // on/off variable for left button = bit 0 of mstat
|
||||
boolean right_button = 0; // on/off variable for right button = bit 1 of mstat
|
||||
boolean old_left_button = 0; // on/off variable for left button status the previous polling cycle
|
||||
boolean old_right_button = 0; // on/off variable for right button status the previous polling cycle
|
||||
boolean button_change = 0; // Active high, shows when a touchpad left or right button has changed since last polling cycle
|
||||
|
||||
//---------------------------------Main Loop---------------------------------------------
|
||||
//
|
||||
void loop() {
|
||||
// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups).
|
||||
// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan
|
||||
// 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.
|
||||
// The keyboard keys will read as logic low if they are pressed (negative logic).
|
||||
// The old_key matrix also uses negative logic (low=pressed).
|
||||
//
|
||||
for (int x = 0; x < rows_max; x++) { // loop thru the rows
|
||||
go_0(Row_IO[x]); // Activate Row (send it low)
|
||||
delayMicroseconds(10); // give the row time to go low and settle out
|
||||
for (int y = 0; y < cols_max; y++) { // loop thru the columns
|
||||
// **********Modifier keys including the Fn special case
|
||||
if (modifier[x][y] != 0) { // check if modifier key exists at this location in the array (a non-zero value)
|
||||
if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // Read column to see if key is low (pressed) and was previously not pressed
|
||||
if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key
|
||||
load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable
|
||||
send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
|
||||
old_key[x][y] = LOW; // Save state of key as "pressed"
|
||||
}
|
||||
else {
|
||||
Fn_pressed = LOW; // Fn status variable is active low
|
||||
old_key[x][y] = LOW; // old_key state is "pressed" (active low)
|
||||
}
|
||||
}
|
||||
else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed and was previously pressed
|
||||
if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key
|
||||
clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable
|
||||
send_mod(); // function sends all mod's over usb including the one that just released
|
||||
old_key[x][y] = HIGH; // Save state of key as "not pressed"
|
||||
}
|
||||
else {
|
||||
Fn_pressed = HIGH; // Fn is no longer active
|
||||
old_key[x][y] = HIGH; // old_key state is "not pressed"
|
||||
}
|
||||
}
|
||||
}
|
||||
// ***********end of modifier section
|
||||
//
|
||||
// ***********Normal keys and media keys in this section
|
||||
else if ((normal[x][y] != 0) || (media[x][y] != 0)) { // check if normal or media key exists at this location in the array
|
||||
if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // check if key is pressed and was not previously pressed
|
||||
old_key[x][y] = LOW; // Save state of key as "pressed"
|
||||
if (Fn_pressed) { // Fn_pressed is active low so it is not pressed and normal key needs to be sent
|
||||
load_slot(normal[x][y]); //update first available slot with normal key name
|
||||
send_normals(); // send all slots over USB including the key that just got pressed
|
||||
}
|
||||
else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix
|
||||
Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC
|
||||
delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB
|
||||
Keyboard.release(media[x][y]); // send media key release
|
||||
}
|
||||
}
|
||||
else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed
|
||||
old_key[x][y] = HIGH; // Save state of key as "not pressed"
|
||||
if (Fn_pressed) { // Fn is not pressed
|
||||
clear_slot(normal[x][y]); //clear the slot that contains the normal key name
|
||||
send_normals(); // send all slots over USB including the key that was just released
|
||||
}
|
||||
}
|
||||
}
|
||||
// **************end of normal and media key section
|
||||
//
|
||||
}
|
||||
go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
|
||||
}
|
||||
//
|
||||
// Turn on or off the LEDs for Num Lock, Caps Lock, and Scroll Lock based on bit 0, 1, and 2 from the keyboard_leds
|
||||
// variable controlled by the USB host computer
|
||||
//
|
||||
if (keyboard_leds & 1) { // mask off all bits but D0 and test if set
|
||||
go_0(NUM_LED); // turn on the Num Lock LED
|
||||
}
|
||||
else {
|
||||
go_1(NUM_LED); // turn off the Num Lock LED
|
||||
}
|
||||
//
|
||||
//
|
||||
if (keyboard_leds & 1<<1) { // mask off all bits but D1 and test if set
|
||||
go_0(CAPS_LED); // turn on the Caps Lock LED
|
||||
}
|
||||
else {
|
||||
go_1(CAPS_LED); // turn off the Caps Lock LED
|
||||
}
|
||||
//
|
||||
//
|
||||
if (keyboard_leds & 1<<2) { // mask off all bits but D2 and test if set
|
||||
go_0(SCRL_LED); // turn on the Scroll Lock LED
|
||||
}
|
||||
else {
|
||||
go_1(SCRL_LED); // turn off the Scroll Lock LED
|
||||
}
|
||||
//
|
||||
// **********Keyboard scan complete
|
||||
//
|
||||
// ***********Touchpad Section
|
||||
//
|
||||
if (touchpad_error == LOW) { // check if touchpad is present
|
||||
//
|
||||
// poll the touchpad for new movement data
|
||||
over_flow = 0; // assume no overflow until status is received
|
||||
tp_write(0xeb); // request data
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
// bad ack - pass to future error handler
|
||||
}
|
||||
mstat = tp_read(); // save into status variable
|
||||
mx = tp_read(); // save into x variable
|
||||
my = tp_read(); // save into y variable
|
||||
if (((0x80 & mstat) == 0x80) || ((0x40 & mstat) == 0x40)) { // x or y overflow bits set?
|
||||
over_flow = 1; // set the overflow flag
|
||||
}
|
||||
// change the x data from 9 bit to 8 bit 2's complement
|
||||
mx = mx & 0x7f; // mask off 8th bit
|
||||
if ((0x10 & mstat) == 0x10) { // move the sign into
|
||||
mx = 0x80 | mx; // the 8th bit position
|
||||
}
|
||||
// change the y data from 9 bit to 8 bit 2's complement and then take the 2's complement
|
||||
// because y movement on ps/2 format is opposite of touchpad.move function
|
||||
my = my & 0x7f; // mask off 8th bit
|
||||
if ((0x20 & mstat) == 0x20) { // move the sign into
|
||||
my = 0x80 | my; // the 8th bit position
|
||||
}
|
||||
my = (~my + 0x01); // change the sign of y data by taking the 2's complement (invert and add 1)
|
||||
// zero out mx and my if over_flow is set
|
||||
if (over_flow) {
|
||||
mx = 0x00; // data is garbage so zero it out
|
||||
my = 0x00;
|
||||
}
|
||||
// send the x and y data back via usb if either one is non-zero
|
||||
if ((mx != 0x00) || (my != 0x00)) {
|
||||
Mouse.move(mx,my);
|
||||
}
|
||||
//
|
||||
// send the touchpad left and right button status over usb if no error
|
||||
if ((0x01 & mstat) == 0x01) { // if left button set
|
||||
left_button = 1;
|
||||
}
|
||||
else { // clear left button
|
||||
left_button = 0;
|
||||
}
|
||||
if ((0x02 & mstat) == 0x02) { // if right button set
|
||||
right_button = 1;
|
||||
}
|
||||
else { // clear right button
|
||||
right_button = 0;
|
||||
}
|
||||
// Determine if the left or right touchpad buttons have changed since last polling cycle
|
||||
button_change = (left_button ^ old_left_button) | (right_button ^ old_right_button);
|
||||
// Don't send button status if there's no change since last time.
|
||||
if (button_change){
|
||||
Mouse.set_buttons(left_button, 0, right_button); // send button status
|
||||
}
|
||||
old_left_button = left_button; // remember new button status for next polling cycle
|
||||
old_right_button = right_button;
|
||||
}
|
||||
//
|
||||
// End of touchpad routine
|
||||
//
|
||||
// Blink LED on Teensy to show a heart beat
|
||||
//
|
||||
if (blink_count == 0x17) {
|
||||
digitalWrite(HEARTBEAT_LED, blinky);
|
||||
blinky = !blinky;
|
||||
blink_count = 0;
|
||||
}
|
||||
else {
|
||||
blink_count = blink_count + 1;
|
||||
}
|
||||
//
|
||||
delay(22); // The overall keyboard scanning rate is about 30ms
|
||||
}
|
||||
Loading…
Reference in a new issue