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UnderLogic/sega-controller: Embedded driver for reading input from Sega controllers

Embedded driver for reading input from Sega controllers in Rust.

This library utilizes embedded-hal traits as a platform-agnostic driver.

use sega_controller::mega_drive::{MegaDriveButton, MegaDriveController};
use sega_controller::Error;

// Using some kind of hal like `arduino_hal`
// NOTE: You should have pull-up resistors on these pins (10k ohm)
let controller = MegaDriveController::from_pins(
    pins.d8.into_output(),          // select pin
    pins.d2.into_floating_input(),  // data pin 0
    pins.d3.into_floating_input(),  // data pin 1
    pins.d4.into_floating_input(),  // data pin 2
    pins.d5.into_floating_input(),  // data pin 3
    pins.d6.into_floating_input(),  // data pin 4
    pins.d7.into_floating_input(),  // data pin 5
);

// Only do this once every frame (16ms)
match controller.read_state() {
    Ok(state) => {
        if state.is_six_button {
            // do something special for six-button controllers if you like
        }
        
        if state.is_pressed(MegaDriveButton::Start) {
            // start button is currently held down
        }
    }
    Err(Error::NotPresent) => {} // controller is not connected
    _ => {}
}

The Sega Mega Drive uses a standard DB9 serial port connector for controllers.

      CONSOLE PORT (MALE)
 ,---------------------------,
 \  (1)  (2)  (3)  (4)  (5)  /
  \   (6)  (7)  (8)  (9)    /
   `-----------------------'

   CONTROLLER CABLE (FEMALE)
 ,---------------------------,
 \  (5)  (4)  (3)  (2)  (1)  /
  \   (9)  (8)  (7)  (6)    /
   `-----------------------'

NOTE: The controller cable uses a female connector, where the console has male connectors.

Pin Description Mode 1 Data Bit 0 Input 2 Data Bit 1 Input 3 Data Bit 2 Input 4 Data Bit 3 Input 5 +5V VDC -- 6 Data Bit 4 Input 7 Select Output 8 Ground -- 9 Data Bit 5 Input

NOTE: The Mode is from the perspective of the console or microcontroller reading the controller.

Thanks to PlutieDev documentation on how the Mega Drive controller works. Especially useful for polling six-button controllers.

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