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Example_Touchpads/ADB_Trackball.ino
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Example_Touchpads/ADB_Trackball.ino
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/*
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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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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// This software implements an Apple ADB interface for a trackball. It uses a
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// Teensy 3.2 and is based on the code from this Imgur post https://imgur.com/a/BQjt9le
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//
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// Revision History
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// Initial Release Aug 3, 2021
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//
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#define ADB_DATA_PIN 5 // TB bidirectional data pin
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//
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// TB Constants
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int ADB_TIMEOUT = 10000;
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// TB Functions
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static void send_0bit() {
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(65);
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digitalWrite(ADB_DATA_PIN, HIGH);
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delayMicroseconds(35);
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}
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static void send_1bit() {
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(35);
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digitalWrite(ADB_DATA_PIN, HIGH);
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delayMicroseconds(65);
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}
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static void attn() {
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//delay(1);
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digitalWrite(ADB_DATA_PIN, LOW);
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delayMicroseconds(800-35);
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send_0bit();
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}
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void send_talk_command() {
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//attn
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pinMode(ADB_DATA_PIN, OUTPUT);
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attn();
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//address (3) 0011
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//0
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send_0bit();
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send_0bit();
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send_1bit();
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send_1bit();
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//talk 11
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send_1bit();
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send_1bit();
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//register 00
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send_0bit();
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send_0bit();
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//stop bit
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send_0bit();
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//start to stop time
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delayMicroseconds(140);
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}
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int receive_data_packet() {
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pinMode(ADB_DATA_PIN, INPUT);
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int data_time = 0;
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bool command_stop = false;
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int adb_data = 0;
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//begin reading ADB datapin
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while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
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//wait for beginning of start bit
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data_time+=1;
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delayMicroseconds(1);
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}
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while(digitalRead(ADB_DATA_PIN)!=HIGH && data_time < ADB_TIMEOUT){
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//wait for end of start bit
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data_time+=1;
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delayMicroseconds(1);
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}
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while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
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//wait for beginning of first data bit
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data_time+=1;
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delayMicroseconds(1);
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}
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//data packet
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data_time = 0;
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while(!command_stop && data_time < ADB_TIMEOUT) {
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int low = 0;
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int high = 0;
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bool bit_stop = false;
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while(!bit_stop && data_time < ADB_TIMEOUT) {
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int adb_stream = digitalRead(ADB_DATA_PIN);
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if(adb_stream == LOW) low+=1;
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if(adb_stream == HIGH) high+=1;
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if(adb_stream == LOW && high > 0) bit_stop = true;
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if(high > 240){
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bit_stop = true;
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break;
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}
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data_time+=1;
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delayMicroseconds(1);
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}
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if(high > 240){
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command_stop = true;
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}
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//append the new data bit to adb_data
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if(high > low && !command_stop) adb_data = (adb_data << 1) + 1;
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if(low > high && !command_stop) adb_data = adb_data << 1;
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}
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//stop bit
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return adb_data;
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}
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void parse_data(int data) {
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if(data !=0) {
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int mousex = data & 0b0000000001111111;
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int mousey = (data >> 8) & 0b01111111;
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//the mouse value is
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//7 bit two's complement
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if((mousey & 0b1000000) != 0) {
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mousey = ((~mousey + 1) & 0b01111111) * -1;
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}
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if((mousex & 0b1000000) != 0) {
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mousex = ((~mousex + 1) & 0b01111111) * -1;
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}
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Mouse.move(mousex, mousey);
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Mouse.move(mousex, mousey);
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int mouseClick = data & 0b1000000000000000;
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if(mouseClick == 0) {
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Mouse.set_buttons(1,0,0);
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}
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else if(mouseClick != 0) {
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Mouse.set_buttons(0,0,0);
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}
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}
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}
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//
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//----------------------------------Setup-------------------------------------------
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void setup() {
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}
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//
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//---------------------------------Main Loop---------------------------------------------
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//
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void loop() {
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send_talk_command();
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parse_data(receive_data_packet());
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//
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delay(20); //
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}
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