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Frank Adams
GitHub
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1 changed files with 73 additions and 86 deletions
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@ -1,4 +1,4 @@
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/* Copyright 2018 Frank Adams
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/* Copyright 2019 Frank Adams
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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@ -17,6 +17,7 @@
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// Revision History
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// Rev 1.0 - Nov 23, 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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// Rev 1.2 - Feb 2, 2019 - Changed the error routine and added an error LED
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//
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// This code has been tested on the touchpad from an HP Pavilion DV9000
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// Touchpad part number 920-000702-04 Rev A
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@ -34,25 +35,42 @@
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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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// The touchpad ps/2 data and clock lines are connected to the following Teensy I/O pins
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#define TP_DATA 27
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#define TP_CLK 30
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#define TP_DATA 14
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#define TP_CLK 23
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// Teensy LED will be lit if the touchpad fails to respond properly during initialization
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#define ERROR_LED 13
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//
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// Declare variable that will be used by functions
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boolean touchpad_error = LOW; // sent high when touch pad routine times out
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//
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// Function to float a pin and let the pull-up or Touchpad determine the logic level
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void go_z(int pin)
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// Function to set a pin to high impedance (acts like open drain output)
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void go_z(int pin)
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{
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pinMode(pin, INPUT); // make the pin an input so it floats
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pinMode(pin, INPUT);
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digitalWrite(pin, HIGH);
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}
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// function to drive a pin to a logic low
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//
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// Function to set a pin as an input with a pullup
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void go_pu(int pin)
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{
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pinMode(pin, INPUT_PULLUP);
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digitalWrite(pin, HIGH);
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}
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//
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// Function to send a pin to a logic low
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void go_0(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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}
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//
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// Function to send a pin to a logic high
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void go_1(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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}
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//
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// *****************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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@ -63,25 +81,24 @@ void tp_write(char send_data)
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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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go_pu(TP_CLK); //
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go_pu(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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go_pu(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; // break out of infinite loop
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}
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}
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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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go_pu(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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@ -90,14 +107,12 @@ void tp_write(char send_data)
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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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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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@ -108,37 +123,32 @@ void tp_write(char send_data)
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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_z(TP_DATA); // send a 1 to TP to make parity odd
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go_pu(TP_DATA); // send a 1 to TP to make parity odd
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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; // break out of infinite loop
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}
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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) == 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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go_z(TP_DATA); // Release the Data line so it goes high as the stop bit
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go_pu(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; // break out of infinite loop
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}
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}
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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; // break out of infinite loop
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}
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}
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@ -155,22 +165,20 @@ char tp_read(void)
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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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go_pu(TP_CLK); // release the clock
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go_pu(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; // break out of infinite loop
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}
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}
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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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// start bit not correct - put error handler here if desired
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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; // break out of infinite loop
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}
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}
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@ -178,7 +186,6 @@ char tp_read(void)
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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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@ -190,7 +197,6 @@ char tp_read(void)
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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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@ -199,7 +205,6 @@ char tp_read(void)
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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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@ -208,12 +213,11 @@ char tp_read(void)
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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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// bad parity - pass to future error handler
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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; // break out of infinite loop
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}
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}
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@ -221,17 +225,15 @@ char tp_read(void)
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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) == 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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// send bad stop bit to future error handler
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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; // break out of infinite loop
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}
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}
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@ -243,19 +245,19 @@ char tp_read(void)
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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(TP_CLK); // float the clock and data to touchpad
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go_z(TP_DATA);
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go_pu(TP_CLK); // float the clock and data to touchpad
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go_pu(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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delay(350); // wait 350ms so tp can 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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if (tp_read() != 0x00) { // verify basic assurance test passed
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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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@ -272,28 +274,12 @@ void touchpad_init()
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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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// ************************************Begin Routine*********************************************************
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void setup()
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{
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touchpad_init(); // reset touchpad, then set it's resolution and put it in remote mode
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if (touchpad_error) {
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touchpad_init(); // try one more time to initialize the touchpad
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}
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pinMode(ERROR_LED, OUTPUT); // define teensy I/O 13 as an output
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}
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// declare and initialize variables
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@ -310,45 +296,43 @@ void setup()
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// ************************************Main Loop***************************************************************
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void loop() {
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if (touchpad_error == LOW) { // check if touchpad is present
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digitalWrite(ERROR_LED, LOW); // turn off LED on Teensy to show touchpad initialized OK
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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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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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over_flow = 0; // assume no overflow until status is received
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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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// bad ack - pass to future error handler
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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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// change the x data from 9 bit to 8 bit 2's complement
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mx = mx >> 1; // convert to 7 bits of data by dividing by 2
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mx = mx & 0x7f; // don't allow sign extension
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if ((0x10 & mstat) == 0x10) { // move the sign into
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mx = 0x80 | mx; // the 8th bit position
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}
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mx = mx & 0x7f; // mask off 8th bit
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if ((0x10 & mstat) == 0x10) { // move the sign into
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mx = 0x80 | mx; // the 8th bit position
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}
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// change the y data from 9 bit to 8 bit 2's complement and then take the 2's complement
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// because y movement on ps/2 format is opposite of touchpad.move function
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my = my >> 1; // convert to 7 bits of data by dividing by 2
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my = my & 0x7f; // don't allow sign extension
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if ((0x20 & mstat) == 0x20) { // move the sign into
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my = 0x80 | my; // the 8th bit position
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}
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my = (~my + 0x01); // change the sign of y data by taking the 2's complement (invert and add 1)
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my = my & 0x7f; // mask off 8th bit
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if ((0x20 & mstat) == 0x20) { // move the sign into
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my = 0x80 | my; // the 8th bit position
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}
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my = (~my + 0x01); // change the sign of y data by taking the 2's complement (invert and add 1)
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// zero out mx and my if over_flow or touchpad_error is set
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if ((over_flow) || (touchpad_error)) {
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mx = 0x00; // data is garbage so zero it out
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my = 0x00;
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}
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if ((over_flow) || (touchpad_error)) {
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mx = 0x00; // data is garbage so zero it out
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my = 0x00;
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}
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// send the x and y data back via usb if either one is non-zero
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if ((mx != 0x00) || (my != 0x00)) {
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Mouse.move(mx,my);
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}
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if ((mx != 0x00) || (my != 0x00)) {
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Mouse.move(mx,my);
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}
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//
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// send the touchpad left and right button status over usb if no error
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if (!touchpad_error) {
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if ((0x01 & mstat) == 0x01) { // if left button set
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left_button = 1;
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}
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@ -369,6 +353,9 @@ void loop() {
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}
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old_left_button = left_button; // remember new button status for next polling cycle
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old_right_button = right_button;
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}
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else {
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digitalWrite(ERROR_LED, HIGH);
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}
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//
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// **************************************End of touchpad routine***********************************
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