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// This software interfaces the Teensy 3.2 with a PS/2 touchpad found in an HP DV9000 laptop. // This software interfaces the Teensy 3.2 with a PS/2 touchpad from a laptop.
// The ps/2 code uses the USB PJRC Mouse functions at www.pjrc.com/teensy/td_mouse.html // The ps/2 code uses the USB PJRC Mouse functions at www.pjrc.com/teensy/td_mouse.html
// The ps/2 code has a watchdog timer so the code can't hang if a clock edge is missed. // The ps/2 code has a watchdog timer so the code can't hang if a clock edge is missed.
// In the Arduino IDE, select Tools, Teensy 3.2/3.1. Also under Tools, select Keyboard+Mouse+Joystick // In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick
// //
// Revision History // Revision History
// Rev 1.0 - Nov 23, 2018 - Original Release // Rev 1.0 - Nov 23, 2018 - Original Release
// Rev 1.1 - Dec 2, 2018 - Replaced ps/2 trackpoint code from playground arduino with my own code // Rev 1.1 - Dec 2, 2018 - Replaced ps/2 trackpoint code from playground arduino with my own code
// Rev 1.2 - Feb 2, 2019 - Changed the error routine and added an error LED // Rev 1.2 - Feb 2, 2019 - Changed the error routine and added an error LED
// Rev 1.3 - Feb 14, 2019 - Added pinouts for different touchpads
// //
// This code has been tested on the touchpad from an HP Pavilion DV9000 // This code has been tested on the following touchpads:
// Touchpad part number 920-000702-04 Rev A
// The test points on the touchpad were wired to a Teensy 3.2 as follows:
// T22 = 5V wired to the Teensy Vin pin
// T23 = Gnd wired to the Teensy Ground pin It's hard to solder to the T23 ground plane so I soldered to a bypass cap gnd pad.
// T10 = Clock wired to the Teensy I/O 30 pin
// T11 = Data wired to the Teensy I/O 27 pin
// //
// Clock and Data measure open to the 5 volt pin, indicating no pull up resistors but, // Dell D630 Touchpad. I used the wires from the touchpad connector as follows:
// Clock and Data both measure 5 volts when the touchpad is powered, indicating active pullups are in // Pin 2 = 5V
// the touchpad blob top chip. // Pin 1 = Gnd
// The ps/2 signals are at 5 volts from the touchpad to the Teensy which is 5 volt tolerant. // Pin 7 = Clock
// The ps/2 signals are at 3.3 volts from the Teensy to the touchpad which is enough to be a logic high. // Pin 6 = Data
// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick // This touchpad has resistive pullups so no additional pullups were required.
// //
// The touchpad ps/2 data and clock lines are connected to the following Teensy I/O pins // HP Pavilion DV9000 Touchpad part number 920-000702-04 Rev A
// The test points on the touchpad were wired as follows:
// T22 = 3.3V (The touchpad also works with 5V)
// T23 = Gnd (I soldered to the ground plane)
// T10 = Clock
// T11 = Data
// This touchpad has active pullups so no additional pullups were required.
//
// Dell 1545 touchpad. I soldered wires to the 4 pin connector as follows:
// Pin 1 = 5V
// Pin 4 = Gnd
// Pin 3 = Clock
// Pin 2 = Data
// This touchpad has active pullups so no additional pullups were required.
//
// The touchpad ps/2 data and clock lines are connected to the following Teensy I/O pins (modify to match your jumper wires)
#define TP_DATA 14 #define TP_DATA 14
#define TP_CLK 23 #define TP_CLK 23
// Teensy LED will be lit if the touchpad fails to respond properly during initialization // Teensy LED will be lit if the touchpad fails to respond properly during initialization