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Example_Keyboards/Lenovo_ThinkPad_T61/Lenovo_T61_KBandTP.ino
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// This software is in the public domain
// It controls a Lenovo ThinkPad T61 Laptop Keyboard and PS/2 Trackpoint using a Teensy 3.2 on
// a daughterboard with a 44 pin FPC connector. The keyboard part number is 42T3177.
// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
// keys over USB. Only the volume control multi-media keys are supported by this routine.
// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html
// The PS/2 code for the Trackpoint was originally from https://playground.arduino.cc/uploads/ComponentLib/mouse.txt
// but the interface to the host was changed from RS232 serial to USB using the PJRC Mouse functions.
// A watchdog timer was also added to the "while loops" so the code can't hang if a clock edge is missed.
//
// Revision History
// Initial Release Oct 27, 2018
//
// Trackpoint signals
#define MDATA 18 // ps/2 data to trackpoint
#define MCLK 19 // ps/2 clock to trackpoint
#define MRESET 0 // active high trackpoint reset at power up
// Keyboard LEDs
#define CAPS_LED 28 // Wire these 3 I/O's to the anode side of LED's
#define NUM_LED 29 // Wire the cathode side thru a dropping resistor
#define SCRL_LED 30 // to ground.
#define BLINK_LED 13 // The LED on the Teensy is programmed to blink
// Keyboard Fn key (aka HOTKEY)
#define HOTKEY 14 // Fn key plus side
#define HOTKEY_RTN 23 // Fn key minus side (always driven low in this routine)
// sync signal for measuring scan frequency
#define SYNC 27
// Set the keyboard row & column size
const byte rows_max = 16; // sets the number of rows in the matrix
const byte cols_max = 8; // sets the number of columns in the matrix
//
// Load the normal key matrix with the Teensyduino key names described at www.pjrc.com/teensy/td_keyboard.html
// A zero indicates no normal key at that location.
//
int normal[rows_max][cols_max] = {
{KEY_TILDE,KEY_1,KEY_Q,KEY_TAB,KEY_A,KEY_ESC,KEY_Z,0},
{KEY_F1,KEY_2,KEY_W,KEY_CAPS_LOCK,KEY_S,0,KEY_X,0},
{KEY_F2,KEY_3,KEY_E,KEY_F3,KEY_D,KEY_F4,KEY_C,0},
{KEY_5,KEY_4,KEY_R,KEY_T,KEY_F,KEY_G,KEY_V,KEY_B},
{KEY_6,KEY_7,KEY_U,KEY_Y,KEY_J,KEY_H,KEY_M,KEY_N},
{KEY_EQUAL,KEY_8,KEY_I,KEY_RIGHT_BRACE,KEY_K,KEY_F6,KEY_COMMA,0},
{KEY_F8,KEY_9,KEY_O,KEY_F7,KEY_L,0,KEY_PERIOD,0},
{KEY_MINUS,KEY_0,KEY_P,KEY_LEFT_BRACE,KEY_SEMICOLON,KEY_QUOTE,0,KEY_SLASH},
{KEY_F9,KEY_F10,0,KEY_BACKSPACE,KEY_BACKSLASH,KEY_F5,KEY_ENTER,KEY_SPACE},
{KEY_INSERT,KEY_F12,0,0,0,0,0,KEY_RIGHT},
{KEY_DELETE,KEY_F11,0,0,0,0,0,KEY_DOWN},
{KEY_PAGE_UP,KEY_PAGE_DOWN,0,0,KEY_MENU,0,0,0},
{KEY_HOME,KEY_END,0,0,0,KEY_UP,KEY_PAUSE,KEY_LEFT},
{0,KEY_PRINTSCREEN,KEY_SCROLL_LOCK,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0}
};
// Load the modifier key matrix with key names at the correct row-column location.
// A zero indicates no modifier key at that location.
int modifier[rows_max][cols_max] = {
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,MODIFIERKEY_GUI,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,MODIFIERKEY_LEFT_ALT,0,MODIFIERKEY_RIGHT_ALT},
{0,0,0,MODIFIERKEY_LEFT_SHIFT,0,0,MODIFIERKEY_RIGHT_SHIFT,0},
{MODIFIERKEY_LEFT_CTRL,0,0,0,0,0,MODIFIERKEY_RIGHT_CTRL,0}
};
// Load the media key matrix with key names at the correct row-column location.
// A zero indicates no media key at that location.
int media[rows_max][cols_max] = {
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,KEY_MEDIA_VOLUME_INC,KEY_MEDIA_VOLUME_DEC,KEY_MEDIA_MUTE,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0}
};
// Initialize the old_key matrix with one's.
// 1 = key not pressed, 0 = key is pressed
boolean old_key[rows_max][cols_max] = {
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1},
{1,1,1,1,1,1,1,1}
};
//
// Define the Teensy 3.2 I/O numbers
//
// Row FPC pin # 22,18,14,10,02,04,08,12,06,20,16,24,28,32,26,30
// Teensy I/O # 20,33,24,25,31,32,07,06,26,04,05,03,02,01,21,22
int Row_IO[rows_max] = {20,33,24,25,31,32,7,6,26,4,5,3,2,1,21,22}; // Teensy 3.2 I/O numbers for rows
//
// Column FPC pin # 05,13,09,07,11,03,15,17
// Teensy I/O # 16,10,12,17,11,15,09,08
int Col_IO[cols_max] = {16,10,12,17,11,15,9,8}; // Teensy 3.2 I/O numbers for columns
//
// Declare variables that will be used by functions
boolean trackpoint_error = LOW; // sent high when touch pad routine times out
boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys
// slot 1 thru slot 6 hold the normal key values to be sent over USB.
int slot1 = 0; //value of 0 means the slot is empty and can be used.
int slot2 = 0;
int slot3 = 0;
int slot4 = 0;
int slot5 = 0;
int slot6 = 0;
//
int mod_shift_l = 0; // These variables are sent over USB as modifier keys.
int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ...
int mod_ctrl_l = 0;
int mod_ctrl_r = 0;
int mod_alt_l = 0;
int mod_alt_r = 0;
int mod_gui = 0;
//
// *****************Functions for Trackpoint***************************
// Function to send the trackpoint a command
void trackpoint_write(char data)
{
char i;
char parity = 1;
// put pins in output mode
go_z(MDATA);
go_z(MCLK);
elapsedMillis watchdog; // set watchdog to zero
delayMicroseconds(300);
go_0(MCLK);
delayMicroseconds(300);
go_0(MDATA);
delayMicroseconds(10);
// start bit
go_z(MCLK);
// wait for trackpoint to take control of clock)
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// clock is low, and we are clear to send data
for (i=0; i < 8; i++) {
if (data & 0x01) {
go_z(MDATA);
}
else {
go_0(MDATA);
}
// wait for clock cycle
while (digitalRead(MCLK) == LOW) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
parity = parity ^ (data & 0x01);
data = data >> 1;
}
// parity
if (parity) {
go_z(MDATA);
}
else {
go_0(MDATA);
}
// wait for clock cycle
while (digitalRead(MCLK) == LOW) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// stop bit
go_z(MDATA);
delayMicroseconds(50);
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// wait for trackpoint to switch modes
while ((digitalRead(MCLK) == LOW) || (digitalRead(MDATA) == LOW)) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// put a hold on the incoming data.
go_0(MCLK);
}
//
// Function to get a byte of data from the trackpoint
//
char trackpoint_read(void)
{
char data = 0x00;
int i;
char bity = 0x01;
// start the clock
elapsedMillis watchdog; // set watchdog to zero
go_z(MCLK);
go_z(MDATA);
delayMicroseconds(50);
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
delayMicroseconds(5); // wait for clock ring to settle
while (digitalRead(MCLK) == LOW) { // eat start bit
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
for (i=0; i < 8; i++) {
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
if (digitalRead(MDATA) == HIGH) {
data = data | bity;
}
while (digitalRead(MCLK) == LOW) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
bity = bity << 1;
}
// ignore parity bit
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
while (digitalRead(MCLK) == LOW) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// eat stop bit
while (digitalRead(MCLK) == HIGH) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
while (digitalRead(MCLK) == LOW) {
if (watchdog >= 200) { //check for infinite loop
trackpoint_error = HIGH; // set error flag
break;
}
}
// put a hold on the incoming data.
go_0(MCLK);
return data;
}
void trackpoint_init()
{
trackpoint_error = LOW; // start with no error
go_z(MCLK); // float the clock and data to trackpoint
go_z(MDATA);
// Trackpoint Reset signal is active high. Start it off low to let power stabilize
go_0(MRESET); // drive low
delay(1000); // wait 1 second
go_1(MRESET); // drive High to activate Reset signal to trackpoint
delay(1000); // wait 1 second to give it a good long reset
go_0(MRESET); // drive Reset back to the inactive (low) state
delay(1000); // wait 1 second before proceeding so trackpoint is ready
// Sending reset command to trackpoint
trackpoint_write(0xff);
trackpoint_read(); // ack byte
// Read ack byte
trackpoint_read(); // blank
trackpoint_read(); // blank
// Sending remote mode code so the trackpoint will send data only when polled
trackpoint_write(0xf0); // remote mode
trackpoint_read(); // Read ack byte
delayMicroseconds(100);
}
//
// *****************Functions for Keyboard*****************************
// Function to load the key name into the first available slot
void load_slot(int key) {
if (!slot1) {
slot1 = key;
}
else if (!slot2) {
slot2 = key;
}
else if (!slot3) {
slot3 = key;
}
else if (!slot4) {
slot4 = key;
}
else if (!slot5) {
slot5 = key;
}
else if (!slot6) {
slot6 = key;
}
if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) {
slots_full = LOW; // slots are not full
}
else {
slots_full = HIGH; // slots are full
}
}
//
// Function to clear the slot that contains the key name
void clear_slot(int key) {
if (slot1 == key) {
slot1 = 0;
}
else if (slot2 == key) {
slot2 = 0;
}
else if (slot3 == key) {
slot3 = 0;
}
else if (slot4 == key) {
slot4 = 0;
}
else if (slot5 == key) {
slot5 = 0;
}
else if (slot6 == key) {
slot6 = 0;
}
slots_full = LOW;
}
//
// Function to load the modifier key name into the appropriate mod variable
void load_mod(int m_key) {
if (m_key == MODIFIERKEY_LEFT_SHIFT) {
mod_shift_l = m_key;
}
else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
mod_shift_r = m_key;
}
else if (m_key == MODIFIERKEY_LEFT_CTRL) {
mod_ctrl_l = m_key;
}
else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
mod_ctrl_r = m_key;
}
else if (m_key == MODIFIERKEY_LEFT_ALT) {
mod_alt_l = m_key;
}
else if (m_key == MODIFIERKEY_RIGHT_ALT) {
mod_alt_r = m_key;
}
else if (m_key == MODIFIERKEY_GUI) {
mod_gui = m_key;
}
}
//
// Function to load 0 into the appropriate mod variable
void clear_mod(int m_key) {
if (m_key == MODIFIERKEY_LEFT_SHIFT) {
mod_shift_l = 0;
}
else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
mod_shift_r = 0;
}
else if (m_key == MODIFIERKEY_LEFT_CTRL) {
mod_ctrl_l = 0;
}
else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
mod_ctrl_r = 0;
}
else if (m_key == MODIFIERKEY_LEFT_ALT) {
mod_alt_l = 0;
}
else if (m_key == MODIFIERKEY_RIGHT_ALT) {
mod_alt_r = 0;
}
else if (m_key == MODIFIERKEY_GUI) {
mod_gui = 0;
}
}
//
// Function to send the modifier keys over usb
void send_mod() {
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
}
//
go_0(HOTKEY_RTN); // Always drive the Hotkey return side low
go_pu(HOTKEY); // Pull up the Hotkey plus side for reading
//
pinMode(BLINK_LED, OUTPUT); // I/O 13 drives the LED on the Teensy
pinMode(SYNC, OUTPUT); // I/O 27 drives a scope for frequency measurement
}
//
// *******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.
char blink_count = 0; // Blink loop counter
boolean blinky = LOW; // Blink LED state
boolean sync_sig = LOW; // sync pulse to measure scan frequency
//
//*********************************Main Loop*******************************************
//
void loop() {
// *************Keyboard Main**************
// Read the Fn key (aka Hotkey) which is not part of the key matrix
if (!digitalRead(HOTKEY)) {
Fn_pressed = LOW; // Fn key is pressed (active low)
}
else {
Fn_pressed = HIGH; // Fn key is not pressed
}
//
// 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
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 if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed and was previously pressed
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"
}
}
// ***********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 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_1(NUM_LED); // turn on the Num Lock LED
}
else {
go_0(NUM_LED); // turn off the Num Lock LED
}
//
//
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
}
//
//
if (keyboard_leds & 1<<2) { // mask off all bits but D2 and test if set
go_1(SCRL_LED); // turn on the Scroll Lock LED
}
else {
go_0(SCRL_LED); // turn off the Scroll Lock LED
}
//
// Blink LED on Teensy to show a heart beat
//
if (blink_count == 0x17) {
digitalWrite(BLINK_LED, blinky);
blinky = !blinky;
blink_count = 0;
}
else {
blink_count = blink_count + 1;
}
//
// Provide a sync pulse to measure the scan frequency
//
sync_sig = !sync_sig; // toggle the sync signal
digitalWrite(SYNC, sync_sig);
//
// ****************End of main loop
//
delay(24); // The overall keyboard/trackpoint scanning rate was measured at 30ms
}