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Delete ADB_Trackball.ino

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Frank Adams 2021-08-03 07:33:48 -07:00 committed by GitHub
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Example_Keyboards/Powerbook_Keyboard_TB_RevNew/ADB_Trackball.ino
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// This software implements an Apple ADB interface for a trackball. It uses a
// Teensy 3.2 and is based on the code from this Imgur post https://imgur.com/a/BQjt9le
//
// Revision History
// Initial Release Aug 3, 2021
//
#define ADB_DATA_PIN 5 // TB bidirectional data pin
//
// TB Constants
int ADB_TIMEOUT = 10000;
// TB Functions
static void send_0bit() {
digitalWrite(ADB_DATA_PIN, LOW);
delayMicroseconds(65);
digitalWrite(ADB_DATA_PIN, HIGH);
delayMicroseconds(35);
}
static void send_1bit() {
digitalWrite(ADB_DATA_PIN, LOW);
delayMicroseconds(35);
digitalWrite(ADB_DATA_PIN, HIGH);
delayMicroseconds(65);
}
static void attn() {
//delay(1);
digitalWrite(ADB_DATA_PIN, LOW);
delayMicroseconds(800-35);
send_0bit();
}
void send_talk_command() {
//attn
pinMode(ADB_DATA_PIN, OUTPUT);
attn();
//address (3) 0011
//0
send_0bit();
send_0bit();
send_1bit();
send_1bit();
//talk 11
send_1bit();
send_1bit();
//register 00
send_0bit();
send_0bit();
//stop bit
send_0bit();
//start to stop time
delayMicroseconds(140);
}
int receive_data_packet() {
pinMode(ADB_DATA_PIN, INPUT);
int data_time = 0;
bool command_stop = false;
int adb_data = 0;
//begin reading ADB datapin
while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
//wait for beginning of start bit
data_time+=1;
delayMicroseconds(1);
}
while(digitalRead(ADB_DATA_PIN)!=HIGH && data_time < ADB_TIMEOUT){
//wait for end of start bit
data_time+=1;
delayMicroseconds(1);
}
while(digitalRead(ADB_DATA_PIN)!=LOW && data_time < ADB_TIMEOUT){
//wait for beginning of first data bit
data_time+=1;
delayMicroseconds(1);
}
//data packet
data_time = 0;
while(!command_stop && data_time < ADB_TIMEOUT) {
int low = 0;
int high = 0;
bool bit_stop = false;
while(!bit_stop && data_time < ADB_TIMEOUT) {
int adb_stream = digitalRead(ADB_DATA_PIN);
if(adb_stream == LOW) low+=1;
if(adb_stream == HIGH) high+=1;
if(adb_stream == LOW && high > 0) bit_stop = true;
if(high > 240){
bit_stop = true;
break;
}
data_time+=1;
delayMicroseconds(1);
}
if(high > 240){
command_stop = true;
}
//append the new data bit to adb_data
if(high > low && !command_stop) adb_data = (adb_data << 1) + 1;
if(low > high && !command_stop) adb_data = adb_data << 1;
}
//stop bit
return adb_data;
}
void parse_data(int data) {
if(data !=0) {
int mousex = data & 0b0000000001111111;
int mousey = (data >> 8) & 0b01111111;
//the mouse value is
//7 bit two's complement
if((mousey & 0b1000000) != 0) {
mousey = ((~mousey + 1) & 0b01111111) * -1;
}
if((mousex & 0b1000000) != 0) {
mousex = ((~mousex + 1) & 0b01111111) * -1;
}
Mouse.move(mousex, mousey);
Mouse.move(mousex, mousey);
int mouseClick = data & 0b1000000000000000;
if(mouseClick == 0) {
Mouse.set_buttons(1,0,0);
}
else if(mouseClick != 0) {
Mouse.set_buttons(0,0,0);
}
}
}
//
//----------------------------------Setup-------------------------------------------
void setup() {
}
//
//---------------------------------Main Loop---------------------------------------------
//
void loop() {
send_talk_command();
parse_data(receive_data_packet());
//
delay(20); //
}