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// This software is in the public domain
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// It controls a Lenovo ThinkPad T61 Laptop Keyboard and PS/2 Trackpoint using a Teensy LC on
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// a daughterboard with a 44 pin FPC connector. The keyboard part number is 42T3177.
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// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
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// keys over USB. Only the volume control multi-media keys are supported by this routine.
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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 for the Trackpoint was originally from https://playground.arduino.cc/uploads/ComponentLib/mouse.txt
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// but the interface to the host was changed from RS232 serial to USB using the PJRC Mouse functions.
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// A watchdog timer was also added to the "while loops" so the code can't hang if a clock edge is missed.
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//
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// Revision History
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// Initial Release Nov 7, 2018
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//
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#define MODIFIERKEY_FN 0x8f // give Fn key a HID code
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// Trackpoint signals
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#define MDATA 0 // ps/2 data to trackpoint (via BSS138 level translator)
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#define MCLK 1 // ps/2 clock to trackpoint (via BSS138 level translator)
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// Keyboard LEDs
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#define CAPS_LED 13 // includes 715 ohm resistor for 2ma LED
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// Set the keyboard row & column size
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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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{KEY_TILDE,KEY_1,KEY_Q,KEY_TAB,KEY_A,KEY_ESC,KEY_Z,0},
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{KEY_F1,KEY_2,KEY_W,KEY_CAPS_LOCK,KEY_S,0,KEY_X,0},
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{KEY_F2,KEY_3,KEY_E,KEY_F3,KEY_D,KEY_F4,KEY_C,0},
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{KEY_5,KEY_4,KEY_R,KEY_T,KEY_F,KEY_G,KEY_V,KEY_B},
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{KEY_6,KEY_7,KEY_U,KEY_Y,KEY_J,KEY_H,KEY_M,KEY_N},
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{KEY_EQUAL,KEY_8,KEY_I,KEY_RIGHT_BRACE,KEY_K,KEY_F6,KEY_COMMA,0},
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{KEY_F8,KEY_9,KEY_O,KEY_F7,KEY_L,0,KEY_PERIOD,0},
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{KEY_MINUS,KEY_0,KEY_P,KEY_LEFT_BRACE,KEY_SEMICOLON,KEY_QUOTE,0,KEY_SLASH},
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{KEY_F9,KEY_F10,0,KEY_BACKSPACE,KEY_BACKSLASH,KEY_F5,KEY_ENTER,KEY_SPACE},
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{KEY_INSERT,KEY_F12,0,0,0,0,0,KEY_RIGHT},
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{KEY_DELETE,KEY_F11,0,0,0,0,0,KEY_DOWN},
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{KEY_PAGE_UP,KEY_PAGE_DOWN,0,0,KEY_MENU,0,0,0},
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{KEY_HOME,KEY_END,0,0,0,KEY_UP,KEY_PAUSE,KEY_LEFT},
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{0,KEY_PRINTSCREEN,KEY_SCROLL_LOCK,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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// 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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{0,0,0,0,0,0,0,0},
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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,MODIFIERKEY_FN,0,0,0},
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{0,0,0,0,0,0,0,0},
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{0,0,MODIFIERKEY_GUI,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,MODIFIERKEY_LEFT_ALT,0,MODIFIERKEY_RIGHT_ALT},
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{0,0,0,MODIFIERKEY_LEFT_SHIFT,0,0,MODIFIERKEY_RIGHT_SHIFT,0},
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{MODIFIERKEY_LEFT_CTRL,0,0,0,0,0,MODIFIERKEY_RIGHT_CTRL,0}
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};
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// Load the media key matrix with 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,KEY_MEDIA_VOLUME_INC,KEY_MEDIA_VOLUME_DEC,KEY_MEDIA_MUTE,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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};
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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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//
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// Define the Teensy 3.2 I/O numbers
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//
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// Row FPC pin # 22,18,14,10,02,04,08,12,06,20,16,24,28,32,26,30
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// Teensy I/O # 15,20,19,18,16,08,07,06,17,09,05,10,11,12,14,26
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int Row_IO[rows_max] = {15,20,19,18,16,8,7,6,17,9,5,10,11,12,14,26}; // Teensy LC I/O numbers for rows
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//
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// Column FPC pin # 05,13,09,07,11,03,15,17
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// Teensy I/O # 21,23,22,25,24,04,03,02
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int Col_IO[cols_max] = {21,23,22,25,24,4,3,2}; // Teensy LC I/O numbers for columns
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//
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// Declare variables that will be used by functions
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boolean trackpoint_error = LOW; // sent high when touch pad routine times out
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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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// *****************Functions for Trackpoint***************************
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// Function to send the trackpoint a command
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void trackpoint_write(char data)
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{
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char i;
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char parity = 1;
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// put pins in output mode
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go_z(MDATA);
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go_z(MCLK);
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elapsedMillis watchdog; // set watchdog to zero
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delayMicroseconds(300);
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go_0(MCLK);
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delayMicroseconds(300);
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go_0(MDATA);
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delayMicroseconds(10);
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// start bit
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go_z(MCLK);
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// wait for trackpoint to take control of clock)
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// clock is low, and we are clear to send data
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for (i=0; i < 8; i++) {
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if (data & 0x01) {
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go_z(MDATA);
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}
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else {
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go_0(MDATA);
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}
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// wait for clock cycle
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while (digitalRead(MCLK) == LOW) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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parity = parity ^ (data & 0x01);
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data = data >> 1;
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}
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// parity
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if (parity) {
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go_z(MDATA);
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}
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else {
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go_0(MDATA);
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}
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// wait for clock cycle
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while (digitalRead(MCLK) == LOW) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// stop bit
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go_z(MDATA);
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delayMicroseconds(50);
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// wait for trackpoint to switch modes
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while ((digitalRead(MCLK) == LOW) || (digitalRead(MDATA) == LOW)) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// put a hold on the incoming data.
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go_0(MCLK);
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}
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//
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// Function to get a byte of data from the trackpoint
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//
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char trackpoint_read(void)
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{
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char data = 0x00;
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int i;
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char bity = 0x01;
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// start the clock
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elapsedMillis watchdog; // set watchdog to zero
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go_z(MCLK);
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go_z(MDATA);
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delayMicroseconds(50);
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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delayMicroseconds(5); // wait for clock ring to settle
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while (digitalRead(MCLK) == LOW) { // eat start bit
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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for (i=0; i < 8; i++) {
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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if (digitalRead(MDATA) == HIGH) {
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data = data | bity;
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}
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while (digitalRead(MCLK) == LOW) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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bity = bity << 1;
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}
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// ignore parity bit
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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while (digitalRead(MCLK) == LOW) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// eat stop bit
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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while (digitalRead(MCLK) == LOW) {
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if (watchdog >= 200) { //check for infinite loop
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trackpoint_error = HIGH; // set error flag
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break;
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}
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}
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// put a hold on the incoming data.
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go_0(MCLK);
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return data;
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}
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void trackpoint_init()
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{
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trackpoint_error = LOW; // start with no error
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go_z(MCLK); // float the clock and data to trackpoint
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go_z(MDATA);
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delay(1000); // wait 1 second to let power on reset to release
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// Sending reset command to trackpoint
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trackpoint_write(0xff);
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trackpoint_read(); // ack byte
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// Read ack byte
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trackpoint_read(); // blank
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trackpoint_read(); // blank
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// Sending remote mode code so the trackpoint will send data only when polled
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trackpoint_write(0xf0); // remote mode
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trackpoint_read(); // Read ack byte
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delayMicroseconds(100);
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}
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//
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// *****************Functions for Keyboard*****************************
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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);
|
||||
Keyboard.send_now();
|
||||
}
|
||||
//
|
||||
// Function to send the normal keys in the 6 slots over usb
|
||||
void send_normals() {
|
||||
Keyboard.set_key1(slot1);
|
||||
Keyboard.set_key2(slot2);
|
||||
Keyboard.set_key3(slot3);
|
||||
Keyboard.set_key4(slot4);
|
||||
Keyboard.set_key5(slot5);
|
||||
Keyboard.set_key6(slot6);
|
||||
Keyboard.send_now();
|
||||
}
|
||||
// **************Functions common to keyboard and trackpoint**************************
|
||||
//
|
||||
// Function to set a pin to high impedance (acts like open drain output)
|
||||
void go_z(int pin)
|
||||
{
|
||||
pinMode(pin, INPUT);
|
||||
digitalWrite(pin, HIGH);
|
||||
}
|
||||
//
|
||||
// Function to set a pin as an input with a pullup
|
||||
void go_pu(int pin)
|
||||
{
|
||||
pinMode(pin, INPUT_PULLUP);
|
||||
digitalWrite(pin, HIGH);
|
||||
}
|
||||
//
|
||||
// Function to send a pin to a logic low
|
||||
void go_0(int pin)
|
||||
{
|
||||
pinMode(pin, OUTPUT);
|
||||
digitalWrite(pin, LOW);
|
||||
}
|
||||
//
|
||||
// Function to send a pin to a logic high
|
||||
void go_1(int pin)
|
||||
{
|
||||
pinMode(pin, OUTPUT);
|
||||
digitalWrite(pin, HIGH);
|
||||
}
|
||||
//
|
||||
//************************************Setup*******************************************
|
||||
void setup() {
|
||||
// ************trackpoint setup
|
||||
trackpoint_init(); // reset trackpoint, then set it's resolution and put it in remote mode
|
||||
if (trackpoint_error) {
|
||||
trackpoint_init(); // try one more time to initialize the trackpoint
|
||||
}
|
||||
// ************keyboard setup
|
||||
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
|
||||
}
|
||||
//
|
||||
}
|
||||
//
|
||||
// *******declare and initialize trackpoint variables
|
||||
char mstat; // trackpoint status reg = Y overflow, X overflow, Y sign bit, X sign bit, Always 1, Middle Btn, Right Btn, Left Btn
|
||||
char mx; // trackpoint 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 trackpoint gives a positive value.
|
||||
char my; // trackpoint y movement also 8 bits plus sign. trackpoint 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 middle_button = 0; // on/off variable for middle button = bit 2 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 old_middle_button = 0; // on/off variable for middle button status the previous polling cycle
|
||||
boolean button_change = 0; // Active high, shows when any trackpoint button has changed since last polling cycle
|
||||
// **********declare and initialize keyboard variables
|
||||
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.
|
||||
//
|
||||
//*********************************Main Loop*******************************************
|
||||
//
|
||||
void loop() {
|
||||
// *************Keyboard Main**************
|
||||
// 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
|
||||
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 section
|
||||
else if (normal[x][y] != 0) { // check if normal key exists at this location in the array (a non-zero value)
|
||||
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 ((normal[x][y] == KEY_SCROLL_LOCK) && (!Fn_pressed)) { // check for special case of Num Lock Key
|
||||
load_slot(KEY_NUM_LOCK); // update first available slot with Num Lock instead of Scroll Lock
|
||||
send_normals(); // send all slots over USB including the Num Lock Key that just got pressed
|
||||
}
|
||||
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 (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 ((normal[x][y] == KEY_SCROLL_LOCK) && (!Fn_pressed)) { // check for special case of Num Lock Key
|
||||
clear_slot(KEY_NUM_LOCK); // clear the slot that contains Num Lock
|
||||
send_normals(); // send all slots over USB including the Num Lock key
|
||||
}
|
||||
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 section
|
||||
//
|
||||
// *************Volume key section. Note PJRC states that volume up, down, & mute should be sent with Keyboard.press function.
|
||||
else if (media[x][y] != 0) { // check if any volume control key exists at this location in the array (a non-zero value)
|
||||
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"
|
||||
Keyboard.press(media[x][y]); // send volume key press
|
||||
}
|
||||
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"
|
||||
Keyboard.release(media[x][y]); // send volume key release
|
||||
}
|
||||
}
|
||||
// ***************end of volume section
|
||||
}
|
||||
go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
|
||||
}
|
||||
//
|
||||
// **********keyboard scan complete
|
||||
//
|
||||
// ****************************Trackpoint Routine*********************************
|
||||
//
|
||||
// poll the trackpoint for new movement data
|
||||
over_flow = 0; // assume no overflow until status is received
|
||||
trackpoint_error = LOW; // start with no error
|
||||
trackpoint_write(0xeb); // request data
|
||||
trackpoint_read(); // ignore ack
|
||||
mstat = trackpoint_read(); // save into status variable
|
||||
mx = trackpoint_read(); // save into x variable
|
||||
my = trackpoint_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 >> 1; // convert to 7 bits of data by dividing by 2
|
||||
mx = mx & 0x7f; // don't allow sign extension
|
||||
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 >> 1; // convert to 7 bits of data by dividing by 2
|
||||
my = my & 0x7f; // don't allow sign extension
|
||||
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 or trackpoint_error is set
|
||||
if ((over_flow) || (trackpoint_error)) {
|
||||
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 trackpoint left and right button status over usb if no error
|
||||
if (!trackpoint_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;
|
||||
}
|
||||
if ((0x04 & mstat) == 0x04) { // if middle button set
|
||||
middle_button = 1;
|
||||
}
|
||||
else { // clear middle button
|
||||
middle_button = 0;
|
||||
}
|
||||
// Determine if any buttons have changed since last polling cycle
|
||||
button_change = ((left_button ^ old_left_button) | (right_button ^ old_right_button) | (middle_button ^ old_middle_button));
|
||||
// Don't send button status if there's no change since last time.
|
||||
if (button_change) {
|
||||
Mouse.set_buttons(left_button, middle_button, right_button); // send button status
|
||||
}
|
||||
old_left_button = left_button; // remember new button status for next polling cycle
|
||||
old_right_button = right_button;
|
||||
old_middle_button = middle_button;
|
||||
}
|
||||
// **************************************End of trackpoint routine***********************************
|
||||
//
|
||||
// *******keyboard LEDs
|
||||
// Turn on or off the LED for Caps Lock based on bit 1 from 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 Caps Lock LED
|
||||
}
|
||||
else {
|
||||
go_0(CAPS_LED); // turn off the Caps Lock LED
|
||||
}
|
||||
//
|
||||
// ****************End of main loop
|
||||
//
|
||||
delay(24); // The overall keyboard/trackpoint scanning rate was measured at 30ms
|
||||
}
|
||||
Loading…
Reference in a new issue