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Frank Adams
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1 changed files with 203 additions and 153 deletions
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@ -15,9 +15,7 @@
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// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
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// keys over USB. Multi-media keys are are sent with keyboard press and release functions.
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// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html
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// The PS/2 code was originally from https://playground.arduino.cc/uploads/ComponentLib/mouse.txt
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// but the interface to the PC 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 doesn't hang if the Teensy is
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// The PS/2 code has a watchdog timer so the code doesn't hang if the Teensy is
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// interrupted by I2C or USB traffic.
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//
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// The test points on the touchpad were wired to a Teensy 3.2 as follows:
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@ -28,14 +26,15 @@
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// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick
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//
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// Revision History
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// Initial Release Nov 15, 2018
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// Rev 1.0 - Nov 15, 2018 - Original Release
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// Rev 1.1 - Dec 2, 2018 - Replaced ps/2 trackpoint code from playground arduino with my own code
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//
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//
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#define MODIFIERKEY_FN 0x8f // give Fn key a HID code
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#define CAPS_LED 13 // Teensy LED shows Caps-Lock
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//
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#define MDATA 15 // Touchpad ps/2 data connected to Teensy I/O pin 15
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#define MCLK 14 // Touchpad ps/2 clock connected to Teensy I/O pin 14
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#define TP_DATA 15 // Touchpad ps/2 data connected to Teensy I/O pin 15
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#define TP_CLK 14 // Touchpad ps/2 clock connected to Teensy I/O pin 14
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//
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//
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const byte rows_max = 17; // sets the number of rows in the matrix
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@ -301,190 +300,239 @@ void go_1(int pin)
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digitalWrite(pin, HIGH);
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}
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//
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// -----------Touchpad Functions--------------
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// Function to send the Touchpad a command
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void touchpad_write(char data)
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// *****************Functions for Touchpad***************************
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//
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// Function to send the touchpad a byte of data (command)
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//
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void tp_write(char send_data)
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{
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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 touchpad 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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unsigned int timeout = 200; // breakout of loop if over this value in msec
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elapsedMillis watchdog; // zero the watchdog timer clock
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char odd_parity = 0; // clear parity bit count
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// Enable the bus by floating the clock and data
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go_z(TP_CLK); //
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go_z(TP_DATA); //
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delayMicroseconds(250); // wait before requesting the bus
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go_0(TP_CLK); // Send the Clock line low to request to transmit data
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delayMicroseconds(100); // wait for 100 microseconds per bus spec
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go_0(TP_DATA); // Send the Data line low (the start bit)
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delayMicroseconds(1); //
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go_z(TP_CLK); // Release the Clock line so it is pulled high
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delayMicroseconds(1); // give some time to let the clock line go high
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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// send the 8 bits of send_data
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for (int j=0; j<8; j++) {
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if (send_data & 1) { //check if lsb is set
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go_z(TP_DATA); // send a 1 to TP
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odd_parity = odd_parity + 1; // keep running total of 1's sent
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}
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else {
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go_0(MDATA);
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go_0(TP_DATA); // send a 0 to TP
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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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touchpad_error = HIGH; // set error flag
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break;
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break; // break out of infinite loop
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}
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}
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}
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while (digitalRead(MCLK) == HIGH) {
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if (watchdog >= 200) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break; // break out of infinite loop
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}
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}
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send_data = send_data >> 1; // shift data right by 1 to prepare for next loop
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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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// send the parity bit
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if (odd_parity & 1) { //check if lsb of parity is set
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go_0(TP_DATA); // already odd so send a 0 to TP
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}
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else {
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go_0(MDATA);
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go_z(TP_DATA); // send a 1 to TP to make parity odd
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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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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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go_z(TP_DATA); // Release the Data line so it goes high as the stop bit
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delayMicroseconds(80); // testing shows delay at least 40us
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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}
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}
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// wait for touchpad 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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delayMicroseconds(1); // wait to let the data settle
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if (digitalRead(TP_DATA)) { // Ack bit s/b low if good transfer
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touchpad_error = HIGH; //bad ack bit so set the error flag
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}
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while ((digitalRead(TP_CLK) == LOW) || (digitalRead(TP_DATA) == LOW)) { // loop if clock or data are low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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// Inhibit the bus so the tp only talks when we're listening
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go_0(TP_CLK);
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}
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//
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// Function to get a byte of data from the touchpad
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//
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char touchpad_read(void)
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char tp_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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unsigned int timeout = 200; // breakout of loop if over this value in msec
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elapsedMillis watchdog; // zero the watchdog timer clock
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char rcv_data = 0; // initialize to zero
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char mask = 1; // shift a 1 across the 8 bits to select where to load the data
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char rcv_parity = 0; // count the ones received
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go_z(TP_CLK); // release the clock
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go_z(TP_DATA); // release the data
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delayMicroseconds(5); // delay to let clock go high
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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if (digitalRead(TP_DATA)) { // Start bit s/b low from tp
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touchpad_error = HIGH; // No start bit so set the error flag
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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for (int k=0; k<8; k++) {
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break; // break out of infinite loop
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}
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}
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if (digitalRead(TP_DATA)) { // check if data is high
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rcv_data = rcv_data | mask; // set the appropriate bit in the rcv data
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rcv_parity++; // increment the parity bit counter
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}
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mask = mask << 1;
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break; // break out of infinite loop
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}
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}
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}
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// receive parity
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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if (digitalRead(TP_DATA)) { // check if received parity is high
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rcv_parity++; // increment the parity bit counter
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}
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rcv_parity = rcv_parity & 1; // mask off all bits except the lsb
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if (rcv_parity == 0) { // check for bad (even) parity
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touchpad_error = HIGH; //bad parity so set the error flag
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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// stop bit
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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if (digitalRead(TP_DATA) == LOW) { // check if stop bit is bad (low)
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touchpad_error = HIGH; //bad stop bit so set the error flag
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}
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delayMicroseconds(1); // delay to let the clock settle out
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while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
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if (watchdog >= timeout) { //check for infinite loop
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touchpad_error = HIGH; // set error flag
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break;
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break; // break out of infinite loop
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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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touchpad_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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touchpad_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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// Inhibit the bus so the tp only talks when we're listening
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go_0(TP_CLK);
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return rcv_data; // pass the received data back
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}
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//
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void touchpad_init()
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{
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touchpad_error = LOW; // start with no error
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go_z(MCLK); // float the clock and data to touchpad
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go_z(MDATA);
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// Sending reset to touchpad
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touchpad_write(0xff);
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touchpad_read(); // ack byte
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// Read ack byte
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touchpad_read(); // blank
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touchpad_read(); // blank
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// Default resolution is 4 counts/mm which is too small
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// Sending resolution command
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touchpad_write(0xe8);
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touchpad_read(); // ack byte
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touchpad_write(0x03); // value of 03 gives 8 counts/mm resolution
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touchpad_read(); // ack byte
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go_z(TP_CLK); // float the clock and data to touchpad
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go_z(TP_DATA);
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// Sending reset command to touchpad
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tp_write(0xff);
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if (tp_read() != 0xfa) { // verify correct ack byte
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touchpad_error = HIGH;
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}
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delayMicroseconds(100); // give the tp time to run its self diagnostic
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// verify proper response from tp
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if (tp_read() != 0xaa) { // verify basic assurance test passed
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touchpad_error = HIGH;
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}
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if (tp_read() != 0x00) { // verify correct device id
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touchpad_error = HIGH;
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}
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// increase resolution from 4 counts/mm to 8 counts/mm
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tp_write(0xe8); // Sending resolution command
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if (tp_read() != 0xfa) { // verify correct ack byte
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touchpad_error = HIGH;
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}
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tp_write(0x03); // value of 03 = 8 counts/mm resolution (default is 4 counts/mm)
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if (tp_read() != 0xfa) { // verify correct ack byte
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touchpad_error = HIGH;
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}
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// Sending remote mode code so the touchpad will send data only when polled
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touchpad_write(0xf0); // remote mode
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touchpad_read(); // Read ack byte
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delayMicroseconds(100);
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tp_write(0xf0); // remote mode
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if (tp_read() != 0xfa) { // verify correct ack byte
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touchpad_error = HIGH;
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}
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if (touchpad_error == HIGH) { // check for any errors from tp
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delayMicroseconds(300); // wait before trying to initialize tp one last time
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tp_write(0xff); // send tp reset code
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tp_read(); // read but don't look at response from tp
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tp_read(); // read but don't look at response from tp
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tp_read(); // read but don't look at response from tp
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tp_write(0xe8); // Send resolution command
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tp_read(); // read but don't look at response from tp
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tp_write(0x03); // value of 03 gives 8 counts/mm resolution
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tp_read(); // read but don't look at response from tp
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tp_write(0xf0); // remote mode
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tp_read(); // read but don't look at response from tp
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delayMicroseconds(100);
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}
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}
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//----------------------------------Setup-------------------------------------------
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void setup() {
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@ -598,11 +646,13 @@ void loop() {
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// poll the touchpad for new movement data
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over_flow = 0; // assume no overflow until status is received
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touchpad_error = LOW; // start with no error
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touchpad_write(0xeb); // request data
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touchpad_read(); // ignore ack
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mstat = touchpad_read(); // save into status variable
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mx = touchpad_read(); // save into x variable
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my = touchpad_read(); // save into y variable
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tp_write(0xeb); // request data
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if (tp_read() != 0xfa) { // verify correct ack byte
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touchpad_error = HIGH;
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}
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mstat = tp_read(); // save into status variable
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mx = tp_read(); // save into x variable
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my = tp_read(); // save into y variable
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if (((0x80 & mstat) == 0x80) || ((0x40 & mstat) == 0x40)) { // x or y overflow bits set?
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over_flow = 1; // set the overflow flag
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}
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