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1 changed files with 76 additions and 9 deletions
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@ -1,4 +1,4 @@
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/* Copyright 2019 Frank Adams
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/* Copyright 2020 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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@ -19,6 +19,7 @@
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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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// Rev 1.3 - Feb 14, 2019 - Added pinouts for different touchpads
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// Rev 1.4 - July 31, 2020 - Added enable command for Elantech touchpads and increased the delay after reset
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//
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// This code has been tested on the following touchpads:
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//
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@ -46,7 +47,7 @@
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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 (modify to match your jumper wires)
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#define TP_DATA 14
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#define TP_CLK 23
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#define TP_CLK 15
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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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@ -262,7 +263,7 @@ 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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delay(350); // wait 350ms so tp can run its self diagnostic
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delay(1000); // wait 1000ms 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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@ -270,19 +271,85 @@ void touchpad_init()
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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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// Send touchpad disable code
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tp_write(0xf5); // tp disable
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// Load Mode Byte with 00 using the following special sequence from page 38.
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// Send set resolution to 0 four times followed by a set sample rate to 0x14
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// #1 set resolution
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tp_write(0xe8); // set resolution
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x01); // to zero
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// #2 set resolution
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tp_write(0xe8); // set resolution
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x00); // to zero
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// #3 set resolution
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tp_write(0xe8); // set resolution
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x00); // to zero
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// #4 set resolution
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tp_write(0xe8); // set resolution
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x00); // to zero
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// Set sample rate
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tp_write(0xf3); // set sample rate
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x14); // to 14 hex
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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// set the resolution
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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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// init_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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tp_write(0x03); // value of 0x03 = 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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// init_error = HIGH;
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}
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// set the sample rate
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tp_write(0xf3); // Sending sample rate command
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_error = HIGH;
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}
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tp_write(0x28); // 0x28 = 40 samples per second, the default value used for Synaptics TP
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if (tp_read() != 0xfa) { // verify correct ack byte
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// init_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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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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// touchpad_error = HIGH;
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}
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// Sending touchpad enable code (needed for Elan touchpads)
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tp_write(0xf4); // tp enable
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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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}
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// ************************************Begin Routine*********************************************************
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