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Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino
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548
Example_Keyboards/Logitech_K120/Logitech_K120_4p1_ergotrac.ino
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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 Logitech K120 Keyboard Controller and a Fujitsu Ergotrac touch sensor
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// using a Teensy 4.1. The Teensy keyboard signals are wired to a pcb with pads. The flexible sheets
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// with traces in the keyboard are pressed against the pcb pads to make the connection. No FPC connector is used.
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// The Ergotrac is sent a logic level pulse after the keyboard scan and two ADC channels read the voltage
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// to sense the up/down and left/right movement
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//
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// Revision History
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// Initial Release Dec 26, 2021
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//
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// keyboard values
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#define MODIFIERKEY_FN 0x8f // give Fn key a HID code
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#define CAPS_LED 22 // Teensy LED shows Caps-Lock
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#define NUM_LED 23
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// X/Y outputs from ErgoTrac feed Teensy ADC channels
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#define ErgoTrac_X A17
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#define ErgoTrac_Y A16
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// Reference signal from Teensy in to ErgoTrac
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#define ErgoTrac_Ref 39
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//
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//
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const byte rows_max = 18; // 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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{0,0,0,0,0,0,0,0},
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{KEY_ESC,KEY_TILDE,KEY_TAB,KEY_Q,KEY_A,KEY_F,KEY_Z,KEY_CAPS_LOCK},
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{KEY_F8,KEY_F9,KEY_8,KEY_9,KEY_0,KEY_O,KEY_L,KEY_SLASH},
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{KEY_PRINTSCREEN,KEY_SCROLL_LOCK,KEY_PAUSE,KEY_PAGE_UP,KEY_NUM_LOCK,KEY_HOME,KEY_PAGE_DOWN,KEY_INSERT},
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{KEY_F10,KEY_F11,KEY_F12,KEY_MINUS,KEY_EQUAL,KEY_I,KEY_LEFT,0},
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{KEY_F6,KEY_F7,KEY_U,KEY_H,KEY_7,KEY_J,KEY_N,KEY_PERIOD},
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{KEY_F4,KEY_4,KEY_R,KEY_5,KEY_F,KEY_V,KEY_M,KEY_MENU},
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{KEY_F5,KEY_T,KEY_6,KEY_Y,KEY_G,KEY_B,KEY_COMMA,0},
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{0,0,0,0,0,0,0,0}, //
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{KEYPAD_SLASH,KEYPAD_8,KEY_END,KEYPAD_ASTERIX,KEYPAD_7,KEYPAD_9,KEYPAD_5,KEYPAD_6}, //
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{0,0,0,0,0,0,0,0}, //
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{0,KEY_BACKSPACE,KEY_P,KEY_LEFT_BRACE,KEY_SEMICOLON,KEY_QUOTE,KEY_K,KEY_DOWN},
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{KEY_RIGHT_BRACE,KEY_BACKSLASH,KEY_DELETE,KEY_ENTER,KEY_UP,KEY_RIGHT,KEYPAD_0,KEY_SPACE},
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{KEYPAD_4,KEYPAD_1,KEYPAD_2,KEYPAD_3,KEYPAD_MINUS,KEYPAD_PLUS,0,KEYPAD_ENTER},
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{KEY_F2,KEY_F3,KEY_3,KEY_E,KEY_D,KEY_C,0,0},
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{KEY_F1,KEY_1,KEY_2,KEY_W,KEY_9,KEY_X,KEY_S,KEYPAD_PERIOD},
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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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};
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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,MODIFIERKEY_CTRL,0,MODIFIERKEY_RIGHT_CTRL,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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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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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,MODIFIERKEY_SHIFT,0,0,0,MODIFIERKEY_RIGHT_SHIFT},
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{0,0,0,0,0,0,0,0},
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{0,MODIFIERKEY_GUI,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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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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{0,0,0,0,0,0,0,0},
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{MODIFIERKEY_ALT,0,0,0,0,MODIFIERKEY_RIGHT_ALT,0,0},
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{0,0,0,0,0,0,MODIFIERKEY_FN,0} // actually the MODIFIERKEY_RIGHT_GUI key
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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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// 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},
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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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{0,0,0,0,0,0,0,0},
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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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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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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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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{KEY_MEDIA_VOLUME_DEC,KEY_MEDIA_VOLUME_INC,0,0,0,0,0,0},
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{KEY_MEDIA_MUTE,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0}
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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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{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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//
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// Define the Teensy 4.1 I/O numbers (translated from the FPC pin #)
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int Row_IO[rows_max] = {0,1,10,11,12,24,25,26,27,28,29,30,31,32,36,35,34,33}; // Teensy 4.0 I/O numbers for rows
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//
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int Col_IO[cols_max] = {2,3,4,5,6,7,8,9}; // Teensy 4.1 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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// declare and initialize ErgoTrac variables
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int x_read; // stores the reading from the X ADC
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int y_read; // same for the Y ADC
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char mx; // signed byte used by the Mouse.move function for x value. Positive value moves to the right
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char my; // positive y value moves down
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int x_delta; // signed 16 bit value gives x movement amount
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int y_delta; // y version.
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int x_center; //resting position of x sensor
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int y_center; //resting position of y sensor
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int noise_zone = 50; // dead zone around the center.
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char slowdown_left = 75; // factor to slow the curser movement down going left
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char slowdown_right = 60; // factor to slow the curser movement down going right
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char slowdown_up = 70; // factor to slow the curser movement down going up
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char slowdown_down = 75; // factor to slow the curser movement down going down
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boolean left_button = 0; // on/off variable for left button, 1 = pushed
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boolean right_button = 0; // on/off variable for right button, 1 = pushed
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boolean old_left_button = 0; // on/off variable for left button from the previous cycle
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boolean old_right_button = 0; // on/off variable for right button from the previous cycle
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boolean button_change = 0; // Shows when the left or right buttons have changed, 1 = change
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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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// 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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}
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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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// Function to re-capture the at-rest X & Y ADC values
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void recenter(void) {
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digitalWrite(ErgoTrac_Ref, LOW); // resting state of reference
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delay(25); // wait before sending calibration pulse
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||||||
|
digitalWrite(ErgoTrac_Ref, HIGH); // Send calibration pulse high
|
||||||
|
delayMicroseconds(400); // wait before reading ADC to allow for rise time
|
||||||
|
x_center = analogRead(ErgoTrac_X); // store the center (no movement) value for x
|
||||||
|
y_center = analogRead(ErgoTrac_Y); // same for y
|
||||||
|
delayMicroseconds(50); // wait before releasing calibration pulse
|
||||||
|
digitalWrite(ErgoTrac_Ref, LOW); // Send calibration pulse back to resting state
|
||||||
|
}
|
||||||
|
// ************************************Begin Routine*********************************************************
|
||||||
|
void setup()
|
||||||
|
{
|
||||||
|
delay(2000); // wait to let things settle out
|
||||||
|
analogReadRes(12); // ADC has 10 usable bits but set resolution to the full 12 bits
|
||||||
|
analogReadAveraging(8); // ADC will take the average of multiple reads to filter noise.
|
||||||
|
pinMode(ErgoTrac_Ref, OUTPUT); // define Teensy I/O that drives the refernce pulses to the ErgoTrac
|
||||||
|
recenter(); // capture the at-rest X and Y position
|
||||||
|
for (int a = 0; a < cols_max; a++) { // loop thru all column pins
|
||||||
|
go_z(Col_IO[a]); // set each column pin as an input without 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
|
||||||
|
}
|
||||||
|
delay(25); // wait 25ms before entering main loop
|
||||||
|
}
|
||||||
|
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 LED status. Caps lock is bit D1.
|
||||||
|
|
||||||
|
//
|
||||||
|
// ************************************Main Loop***************************************************************
|
||||||
|
void loop() {
|
||||||
|
// ******************************************Keyboard**********************************************************
|
||||||
|
//
|
||||||
|
elapsedMillis loop_timer; // zero the loop timer. Timer is used at the end of the loop to determine when to repeat
|
||||||
|
// 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(50); // 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]) && (!slots_full)) { // check if key is pressed and was not previously pressed and slots not full
|
||||||
|
old_key[x][y] = LOW; // Save state of key as "pressed"
|
||||||
|
if (Fn_pressed) { // Fn_pressed high means it's not pressed
|
||||||
|
// **** Special case for Scroll Lock and Pause which are used by Ergotrac as left and right mouse buttons
|
||||||
|
if(normal[x][y] == KEY_SCROLL_LOCK) {
|
||||||
|
left_button = 1; // set the left button
|
||||||
|
}
|
||||||
|
else if(normal[x][y] == KEY_PAUSE) {
|
||||||
|
right_button = 1; // set the right button
|
||||||
|
}
|
||||||
|
// All the other normal keys are sent
|
||||||
|
else {
|
||||||
|
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
|
||||||
|
delayMicroseconds(300);
|
||||||
|
Keyboard.release(media[x][y]); // send media key release
|
||||||
|
}
|
||||||
|
|
||||||
|
else if (normal[x][y] == KEY_F11) { // Fn is active and F11 is pressed - recapture TP center
|
||||||
|
recenter(); // recapture the at-rest X and Y position
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F10) { // Fn is active and F10 is pressed - increase noise zone value by 5
|
||||||
|
noise_zone = noise_zone + 5;
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F9) { // Fn is active and F9 is pressed - decrease noise zone value by 5
|
||||||
|
noise_zone = noise_zone - 5;
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F8) { // Fn is active and F8 is pressed
|
||||||
|
slowdown_left = slowdown_left - 5; // decrease all slowdown values by 5
|
||||||
|
slowdown_right = slowdown_right - 5;
|
||||||
|
slowdown_up = slowdown_up - 5;
|
||||||
|
slowdown_down = slowdown_down - 5;
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F7) { // Fn is active and F7 is pressed
|
||||||
|
slowdown_left = slowdown_left + 5; // increase all slowdown values by 5
|
||||||
|
slowdown_right = slowdown_right + 5;
|
||||||
|
slowdown_up = slowdown_up + 5;
|
||||||
|
slowdown_down = slowdown_down + 5;
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F6) { // Fn is active and F6 is pressed
|
||||||
|
noise_zone = 50; // Set noise zone and slowdowns to default values
|
||||||
|
slowdown_left = 75; // movement left needs more slowdown for some reason
|
||||||
|
slowdown_right = 60;
|
||||||
|
slowdown_up = 70;
|
||||||
|
slowdown_down = 75;
|
||||||
|
}
|
||||||
|
else if (normal[x][y] == KEY_F5) { // Fn is active and F5 is pressed
|
||||||
|
if (noise_zone >= 1000) { // toggle back to normal or huge (off) value
|
||||||
|
noise_zone = 50; // back to start up value
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
noise_zone = 5000; // huge noise zone won't allow cursor movement
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
}
|
||||||
|
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
|
||||||
|
|
||||||
|
// **** Special case for releazse of Scroll Lock or Pause (left and right mouse buttons)
|
||||||
|
if(normal[x][y] == KEY_SCROLL_LOCK) {
|
||||||
|
left_button = 0; // clear the left button
|
||||||
|
}
|
||||||
|
else if(normal[x][y] == KEY_PAUSE) {
|
||||||
|
right_button = 0; // clear the right button
|
||||||
|
}
|
||||||
|
// All the other normal keys are released
|
||||||
|
else {
|
||||||
|
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)
|
||||||
|
}
|
||||||
|
//
|
||||||
|
// **********keyboard scan complete
|
||||||
|
//
|
||||||
|
// ****************************************LEDs********************
|
||||||
|
// Turn on the LEDs for Caps and Num Lock based on the keyboard_leds variable controlled by the USB host computer
|
||||||
|
// CAPS LOCK
|
||||||
|
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
|
||||||
|
}
|
||||||
|
// NUM LOCK
|
||||||
|
if (keyboard_leds & 1) { // mask off all bits but D0 and test if set
|
||||||
|
go_1(NUM_LED); // turn on the LED
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
go_0(NUM_LED); // turn off the LED
|
||||||
|
}
|
||||||
|
//
|
||||||
|
// ********************Ergotrac*************************************************************************************
|
||||||
|
//
|
||||||
|
digitalWrite(ErgoTrac_Ref, HIGH); // send calibration reference pulse
|
||||||
|
//
|
||||||
|
mx = 0; // for each loop, start with zero and update only if movement detected
|
||||||
|
my = 0; // same for y
|
||||||
|
// Read the ADC's
|
||||||
|
x_read = analogRead(ErgoTrac_X); // read the ADC tied to the X sensor
|
||||||
|
y_read = analogRead(ErgoTrac_Y); // read the ADC tied to the Y sensor
|
||||||
|
// Check if X or Y movement is beyond the dead zone
|
||||||
|
if ((x_read > (x_center + noise_zone)) || (x_read < (x_center - noise_zone)) || (y_read > (y_center + noise_zone)) || (y_read < (y_center - noise_zone))) {
|
||||||
|
// Only do the following if at least one reading is beyond the dead zone.
|
||||||
|
// Figure out if the X value is to the right or the left of the center resting value
|
||||||
|
if (x_read > x_center) { // is X ADC to the right of the resting position?
|
||||||
|
x_delta = (x_read - x_center) / slowdown_right; // find out how far beyond center. Divide it to slow it down.
|
||||||
|
mx = byte(x_delta); // convert signed 16 bit to signed 8 bit
|
||||||
|
}
|
||||||
|
else { // X ADC is equal or to the left of the resting position
|
||||||
|
x_delta = ((x_center - x_read) / slowdown_left) * -1; // Answer should be negative so multiply by -1
|
||||||
|
mx = byte(x_delta); // convert signed 16 bit to signed 8 bit
|
||||||
|
}
|
||||||
|
// Figure out if the Y value is above or below the center resting value
|
||||||
|
if (y_read > y_center) { // is Y ADC above the resting position?
|
||||||
|
y_delta = ((y_read - y_center) / slowdown_down) * -1; // up movement is negative for Mouse.move function
|
||||||
|
my = byte(y_delta); // convert signed 16 bit to signed 8 bit
|
||||||
|
}
|
||||||
|
else { // Y ADC is equal or below the resting position
|
||||||
|
y_delta = (y_center - y_read) / slowdown_up;
|
||||||
|
my = byte(y_delta); // convert signed 16 bit to signed 8 bit
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// send the x and y data over usb if either one is not at center position
|
||||||
|
if ((mx != 0x00) || (my != 0x00)) {
|
||||||
|
Mouse.move(mx,my);
|
||||||
|
}
|
||||||
|
digitalWrite(ErgoTrac_Ref, LOW); // release calibration reference
|
||||||
|
|
||||||
|
// Mouse buttons (Scroll Lock and Pause keys)
|
||||||
|
//
|
||||||
|
// Determine if the buttons have changed (using XOR) since the last 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 over USB
|
||||||
|
}
|
||||||
|
old_left_button = left_button; // remember button status for the next cycle
|
||||||
|
old_right_button = right_button;
|
||||||
|
//
|
||||||
|
delay(20); // wait before repeating
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue