USB converter for Apple M0100 mouse

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Yoe:
When trying to find an already made USB converter for the M0100 mouse, I did not find one. However, I stumbled upon this bus mouse converter by GuilleAcoustic:

https://hackaday.io/project/5875-busmouse-to-usb-hid-conversion
https://geekhack.org/index.php?topic=68612.0

With help from him and from some nice old documentation on the M0100, I figured out how this could possibly work. And, luckily, it did :)

The only changes made to the code is setting an internal pull-up for the switch pin (my first version used an external resistor), and commenting out the state check for right and middle buttons.

Wiring to the DB9 goes:

--- Code: --- DB9 Pro Micro
1 GND
2 VCC
3 GND
4 D0 (pin 3)
5 D1 (pin 2)
6 - (not connected)
7 B3 (pin 14)
8 D3 (pin TXO)
9 D2 (pin RXI)
--- End code ---

The code with my changes here:

--- Code: ---/* ================================================================================
Author : GuilleAcoustic
Date : 2015-05-22
Revision: V1.0
Purpose : Opto-mechanical trackball firmware
--------------------------------------------------------------------------------
Wiring informations: Sparkfun Pro micro (Atmega32u4)
--------------------------------------------------------------------------------
- Red : Gnd | Pin: Gnd
- Orange : Vcc (+5V) | Pin: Vcc
- Yellow : X axis encoder / channel A | Pin: PD3 - (INT0)
- Green : X axis encoder / channel B | Pin: PD2 - (INT1)
- Blue : Y axis encoder / channel A | Pin: PD0 - (INT2)
- Violet : Y axis encoder / channel B | Pin: PD1 - (INT3)
- Grey : Switch 1 | Pin: PB3
- White : Switch 2 | Pin: PB2
- Black : Switch 3 | Pin: PB1

--------------------------------------------------------------------------------
Modified for use with Apple M0100 mouse
By Johan Berglund, 2015-08-10

Changes in code:
- Internal pullup set for pin 14 (B3)
- State check for right and middle buttons commented out

Connection to DB9:

DB9 Pro Micro
1 GND
2 VCC
3 GND
4 D0 (pin 3)
5 D1 (pin 2)
6 - (not connected)
7 B3 (pin 14)
8 D3 (pin TXO)
9 D2 (pin RXI)

================================================================================ */

// =================================================================================
// Type definition
// =================================================================================
typedef struct
{
int8_t coordinate = 0;
uint8_t index = 0;
} ENCODER_;

// =================================================================================
// Constant definition
// =================================================================================
const int8_t lookupTable[] = {0, 1, -1, 0, -1, 0, 0, 1, 1, 0, 0, -1, 0, -1, 1, 0};

// =================================================================================
// Volatile variables
// =================================================================================
volatile ENCODER_ xAxis;
volatile ENCODER_ yAxis;

// =================================================================================
// Setup function
// =================================================================================
void setup()
{

// Set pull-up for mouse switch on M0100
pinMode(14, INPUT_PULLUP);

// Attach interruption to encoders channels
attachInterrupt(0, ISR_HANDLER_X, CHANGE);
attachInterrupt(1, ISR_HANDLER_X, CHANGE);
attachInterrupt(2, ISR_HANDLER_Y, CHANGE);
attachInterrupt(3, ISR_HANDLER_Y, CHANGE);

// Start the mouse function
Mouse.begin();
}

// =================================================================================
// Main program loop
// =================================================================================
void loop()
{
// Update mouse coordinates
if (xAxis.coordinate != 0 || yAxis.coordinate != 0)
{
Mouse.move(xAxis.coordinate, yAxis.coordinate);
xAxis.coordinate = 0;
yAxis.coordinate = 0;
}

// Update buttons state
!(PINB & 0b1000) ? Mouse.press(MOUSE_LEFT) : Mouse.release(MOUSE_LEFT);
// !(PINB & 0b0100) ? Mouse.press(MOUSE_RIGHT) : Mouse.release(MOUSE_RIGHT);
// !(PINB & 0b0010) ? Mouse.press(MOUSE_MIDDLE) : Mouse.release(MOUSE_MIDDLE);

// Wait a little before next update
delay(10);
}

// =================================================================================
// Interrupt handlers
// =================================================================================
void ISR_HANDLER_X()
{
// Build the LUT index from previous and new data
xAxis.index = (xAxis.index << 2) | ((PIND & 0b0011) >> 0);
xAxis.coordinate += lookupTable[xAxis.index & 0b1111];
}

void ISR_HANDLER_Y()
{
// Build the LUT index from previous and new data
yAxis.index = (yAxis.index << 2) | ((PIND & 0b1100) >> 2);
yAxis.coordinate += lookupTable[yAxis.index & 0b1111];
}
--- End code ---

Many thanks to GuilleAcoustic for this!

CPTBadAss:
You should shoot a video on your Instagram with the mouse and keyboard in action :D. Looks damn good!

sth:
Is this just on a teensy??? I might have to make one of these :D

Yoe:

--- Quote from: CPTBadAss on Mon, 10 August 2015, 08:09:04 ---You should shoot a video on your Instagram with the mouse and keyboard in action :D. Looks damn good!

--- End quote ---

Haha, maybe.. and show off my lack of wpm and the lack of resolution and accuracy of that ancient mouse.. :P

--- Quote from: sth on Mon, 10 August 2015, 08:09:20 ---Is this just on a teensy??? I might have to make one of these :D

--- End quote ---

It's a Pro Micro, but you can use a Teensy instead if you like.

Hzza:
This is pretty cool, I'd love to see a shot of your new working set up :D.

I'm pretty sure someone added mouse support to the hasu ADBs converter a few months back, with the intention being that you could daisy chain it off of a keyboard running hasu's converter. I never got around to testing it though...I've got a mouse and all the parts for a new converter kicking around, maybe I'll have a go tonight. I'm struggling to adjust to a mouse with only 3 buttons down from one with 5 so god knows what I'd do with a 1 button mouse :D.

edit - Oh wait, that's a serial mouse! My bad, I saw Apple and assumed ADB :D.

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