diff --git a/Example_Keyboards/Dell_D630_Keyboard_and_Touchpad.ino b/Example_Keyboards/Dell_D630_Keyboard_and_Touchpad.ino deleted file mode 100644 index 83f68b7..0000000 --- a/Example_Keyboards/Dell_D630_Keyboard_and_Touchpad.ino +++ /dev/null @@ -1,660 +0,0 @@ -/* Copyright 2018 Frank Adams - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - http://www.apache.org/licenses/LICENSE-2.0 - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. -*/ -// This software implements a Dell Latitude D630 Laptop Keyboard Controller and PS/2 Touchpad Controller -// using a Teensy 3.2 on a daughterboard with a 34 pin FPC connector. The keyboard part number -// is DP/N 0DR160. The Touchpad from an HP DV9000 is part number 920-000702-04 Rev A. -// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier -// keys over USB. Multi-media keys are are sent with keyboard press and release functions. -// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html -// The PS/2 code was originally from https://playground.arduino.cc/uploads/ComponentLib/mouse.txt -// but the interface to the PC 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 doesn't hang if the Teensy is -// interrupted by I2C or USB traffic. -// -// The test points on the touchpad were wired to a Teensy 3.2 as follows: -// T22 = 5V wired to the Teensy Vin pin -// T23 = Gnd wired to the Teensy Ground pin It's hard to solder to T23 so I soldered to a bypass cap gnd pad. -// T10 = Clock wired to the Teensy I/O 14 pin Pull up to 5 volts is in the touchpad -// T11 = Data wired to the Teensy I/O 15 pin Pull up to 5 volts is in the touchpad -// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick -// -// Revision History -// Initial Release Nov 15, 2018 -// -// -#define MODIFIERKEY_FN 0x8f // give Fn key a HID code -#define CAPS_LED 13 // Teensy LED shows Caps-Lock -// -#define MDATA 15 // Touchpad ps/2 data connected to Teensy I/O pin 15 -#define MCLK 14 // Touchpad ps/2 clock connected to Teensy I/O pin 14 -// -// -const byte rows_max = 17; // 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] = { - {0,KEY_INSERT,0,KEY_F12,0,0,0,KEY_RIGHT}, - {0,KEY_DELETE,0,KEY_F11,0,0,0,KEY_DOWN}, - {KEY_UP,KEY_HOME,KEY_MENU,KEY_END,0,0,KEY_PAUSE,KEY_LEFT}, - {0,KEY_F8,KEY_F7,KEY_9,KEY_O,KEY_L,KEY_PERIOD,0}, - {KEY_QUOTE,KEY_MINUS,KEY_LEFT_BRACE,KEY_0,KEY_P,KEY_SEMICOLON,0,KEY_SLASH}, - {KEY_F6,KEY_EQUAL,KEY_RIGHT_BRACE,KEY_8,KEY_I,KEY_K,KEY_COMMA,0}, - {KEY_H,KEY_6,KEY_Y,KEY_7,KEY_U,KEY_J,KEY_M,KEY_N}, - {KEY_F5,KEY_F9,KEY_BACKSPACE,KEY_F10,0,KEY_BACKSLASH,KEY_ENTER,KEY_SPACE}, - {KEY_G,KEY_5,KEY_T,KEY_4,KEY_R,KEY_F,KEY_V,KEY_B}, - {KEY_F4,KEY_F2,KEY_F3,KEY_3,KEY_E,KEY_D,KEY_C,0}, - {0,KEY_F1,KEY_CAPS_LOCK,KEY_2,KEY_W,KEY_S,KEY_X,0}, - {KEY_ESC,KEY_TILDE,KEY_TAB,KEY_1,KEY_Q,KEY_A,KEY_Z,0}, - {0,0,0,KEY_PRINTSCREEN,KEY_NUM_LOCK,0,0,0}, - {0,0,0,0,0,0,0,0}, - {0,0,0,0,0,0,0,0}, - {0,0,0,0,KEY_PAGE_UP,KEY_PAGE_DOWN,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}, - {0,0,0,0,0,0,0,0}, - {MODIFIERKEY_LEFT_ALT,0,0,0,0,0,0,MODIFIERKEY_RIGHT_ALT}, - {0,0,MODIFIERKEY_LEFT_SHIFT,0,0,0,MODIFIERKEY_RIGHT_SHIFT,0}, - {0,MODIFIERKEY_LEFT_CTRL,0,0,0,0,MODIFIERKEY_RIGHT_CTRL,0}, - {0,0,0,MODIFIERKEY_GUI,0,0,0,0}, - {0,0,0,0,0,MODIFIERKEY_FN,0,0} -}; -// Load the media key matrix with Fn 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,KEY_SYSTEM_SLEEP,0,0,0,0,0,0}, - {0,0,0,0,0,0,0,0}, - {0,0,0,0,KEY_SCROLL_LOCK,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}, - {1,1,1,1,1,1,1,1} -}; -// -// Define the Teensy 3.2 I/O numbers (translated from the FPC pin #) -// Row FPC pin # 02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18 -// Teensy I/O # 00,22,01,21,02,20,03,19,04,18,05,17,06,24,07,25,08 -int Row_IO[rows_max] = {0,22,1,21,2,20,3,19,4,18,5,17,6,24,7,25,8}; // Teensy 3.2 I/O numbers for rows -// -// Column FPC pin # 19,20,21,22,23,24,25,26 -// Teensy I/O # 33,09,26,10,27,11,28,12 -int Col_IO[cols_max] = {33,9,26,10,27,11,28,12}; // Teensy 3.2 I/O numbers for columns - -// Declare variables that will be used by functions -boolean touchpad_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; -// -// 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(); -} -// -// 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); -} -// -// -----------Touchpad Functions-------------- -// Function to send the Touchpad a command -void touchpad_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 touchpad to take control of clock) - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_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 - touchpad_error = HIGH; // set error flag - break; - } - } - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_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 - touchpad_error = HIGH; // set error flag - break; - } - } - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - // stop bit - go_z(MDATA); - delayMicroseconds(50); - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - // wait for touchpad to switch modes - while ((digitalRead(MCLK) == LOW) || (digitalRead(MDATA) == LOW)) { - if (watchdog >= 200) { //check for infinite loop - touchpad_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 touchpad -// -char touchpad_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 - touchpad_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 - touchpad_error = HIGH; // set error flag - break; - } - } - for (i=0; i < 8; i++) { - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - if (digitalRead(MDATA) == HIGH) { - data = data | bity; - } - while (digitalRead(MCLK) == LOW) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - bity = bity << 1; - } - // ignore parity bit - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - while (digitalRead(MCLK) == LOW) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - // eat stop bit - while (digitalRead(MCLK) == HIGH) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - while (digitalRead(MCLK) == LOW) { - if (watchdog >= 200) { //check for infinite loop - touchpad_error = HIGH; // set error flag - break; - } - } - // put a hold on the incoming data. - go_0(MCLK); - return data; -} - -void touchpad_init() -{ - touchpad_error = LOW; // start with no error - go_z(MCLK); // float the clock and data to touchpad - go_z(MDATA); - // Sending reset to touchpad - touchpad_write(0xff); - touchpad_read(); // ack byte - // Read ack byte - touchpad_read(); // blank - touchpad_read(); // blank - // Default resolution is 4 counts/mm which is too small - // Sending resolution command - touchpad_write(0xe8); - touchpad_read(); // ack byte - touchpad_write(0x03); // value of 03 gives 8 counts/mm resolution - touchpad_read(); // ack byte - // Sending remote mode code so the touchpad will send data only when polled - touchpad_write(0xf0); // remote mode - touchpad_read(); // Read ack byte - delayMicroseconds(100); -} -//----------------------------------Setup------------------------------------------- -void 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 - } - touchpad_init(); // reset touchpad, then set it's resolution and put it in remote mode - if (touchpad_error) { - touchpad_init(); // try one more time to initialize the touchpad - } -} -// -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. -// -// declare and initialize touchpad variables - char mstat; // touchpad status reg = Y overflow, X overflow, Y sign bit, X sign bit, Always 1, Middle Btn, Right Btn, Left Btn - char mx; // touchpad x movement = 8 data bits. The sign bit is in the status register to - // make a 9 bit 2's complement value. Left to right on the touchpad gives a positive value. - char my; // touchpad y movement also 8 bits plus sign. Touchpad movement away from the user gives a positive value. - boolean over_flow; // set if x or y movement values are bad due to overflow - boolean left_button = 0; // on/off variable for left button = bit 0 of mstat - boolean right_button = 0; // on/off variable for right button = bit 1 of mstat - boolean old_left_button = 0; // on/off variable for left button status the previous polling cycle - boolean old_right_button = 0; // on/off variable for right button status the previous polling cycle - boolean button_change = 0; // Active high, shows when a touchpad left or right button has changed since last polling cycle - -//---------------------------------Main Loop--------------------------------------------- -// -void loop() { -// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups). -// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan -// that was 30msec ago. The status of a key that was just pressed or just released is sent over USB and the state is saved in the old_key matrix. -// The keyboard keys will read as logic low if they are pressed (negative logic). -// The old_key matrix also uses negative logic (low=pressed). -// - for (int x = 0; x < rows_max; x++) { // loop thru the rows - go_0(Row_IO[x]); // Activate Row (send it low) - delayMicroseconds(10); // give the row time to go low and settle out - for (int y = 0; y < cols_max; y++) { // loop thru the columns -// **********Modifier keys including the Fn special case - if (modifier[x][y] != 0) { // check if modifier key exists at this location in the array (a non-zero value) - if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // Read column to see if key is low (pressed) and was previously not pressed - if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key - load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable - send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed - old_key[x][y] = LOW; // Save state of key as "pressed" - } - else { - Fn_pressed = LOW; // Fn status variable is active low - old_key[x][y] = LOW; // old_key state is "pressed" (active low) - } - } - else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed and was previously pressed - if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key - clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable - send_mod(); // function sends all mod's over usb including the one that just released - old_key[x][y] = HIGH; // Save state of key as "not pressed" - } - else { - Fn_pressed = HIGH; // Fn is no longer active - old_key[x][y] = HIGH; // old_key state is "not pressed" - } - } - } -// ***********end of modifier section -// -// ***********Normal keys and media keys in this section - else if ((normal[x][y] != 0) || (media[x][y] != 0)) { // check if normal or media key exists at this location in the array - if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // check if key is pressed and was not previously pressed - old_key[x][y] = LOW; // Save state of key as "pressed" - if (Fn_pressed) { // Fn_pressed is active low so it is not pressed and normal key needs to be sent - load_slot(normal[x][y]); //update first available slot with normal key name - send_normals(); // send all slots over USB including the key that just got pressed - } - else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix - Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC - delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB - Keyboard.release(media[x][y]); // send media key release - } - } - else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed - old_key[x][y] = HIGH; // Save state of key as "not pressed" - if (Fn_pressed) { // Fn is not pressed - clear_slot(normal[x][y]); //clear the slot that contains the normal key name - send_normals(); // send all slots over USB including the key that was just released - } - } - } -// **************end of normal and media key section -// - } - go_z(Row_IO[x]); // De-activate Row (send it to hi-z) - } -// -// **********keyboard scan complete -// -// Turn on the LED on the Teensy for Caps Lock based on bit 1 in the keyboard_leds variable controlled by the USB host computer -// - if (keyboard_leds & 1<<1) { // mask off all bits but D1 and test if set - go_1(CAPS_LED); // turn on the LED - } - else { - go_0(CAPS_LED); // turn off the LED - } -// -// poll the touchpad for new movement data - over_flow = 0; // assume no overflow until status is received - touchpad_error = LOW; // start with no error - touchpad_write(0xeb); // request data - touchpad_read(); // ignore ack - mstat = touchpad_read(); // save into status variable - mx = touchpad_read(); // save into x variable - my = touchpad_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 touchpad_error is set - if ((over_flow) || (touchpad_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 touchpad left and right button status over usb if no error - if (!touchpad_error) { - if ((0x01 & mstat) == 0x01) { // if left button set - left_button = 1; - } - else { // clear left button - left_button = 0; - } - if ((0x02 & mstat) == 0x02) { // if right button set - right_button = 1; - } - else { // clear right button - right_button = 0; - } -// Determine if the left or right touch pad buttons have changed since last polling cycle - button_change = (left_button ^ old_left_button) | (right_button ^ old_right_button); -// Don't send button status if there's no change since last time. - if (button_change){ - Mouse.set_buttons(left_button, 0, right_button); // send button status - } - old_left_button = left_button; // remember new button status for next polling cycle - old_right_button = right_button; - } -// -// End of touchpad routine - - delay(22); // The overall keyboard scanning rate is about 30ms -}