Refactored for teensy 4.0, xEvi hardware

- Switched to platformio, ino -> cpp
- MPRLS for pressure sensor
- Added basic ICM support
- Removed widi, battery, other features not supported in xEvi
- Removed legacy options/processing
- Added LED strip support
- Added encoder support
- Reworked menu code to use encoders/be more flexible

NuEVI/src/hardware.h

@@ -0,0 +1,96 @@
+#ifndef __HARDWARE_H
+#define __HARDWARE_H
+
+#include <Adafruit_MPR121.h>
+#include <Adafruit_MPRLS.h>
+#include <Adafruit_ICM20X.h>
+#include <WS2812Serial.h>
+#include <Adafruit_ICM20948.h>
+#include <stdint.h>
+
+// Hardware sensor definitions
+// TODO: remove these
+
+extern WS2812Serial ledStrip;
+extern Adafruit_Sensor *accelSensor;
+extern Adafruit_ICM20948 icmSensor;
+
+void initHardware();
+bool checkButtonState(uint8_t mask); // return true if the given buttons are pressed
+uint8_t buttonState(); // return true if the given buttons are pressed
+int readKnob(uint8_t n);
+int readTouchKey(uint8_t n);
+int readTouchUtil(uint8_t n);
+uint16_t keysTouched();
+uint16_t utilTouched();
+int readPressure();
+int readAltPressure();
+
+// xEVI hardware setup
+
+// I2C
+#define MainI2CBus Wire1
+#define AuxI2CBus Wire
+#define KeysI2CAddr 0x5B
+#define UtilI2CAddr 0x5A
+
+// Digital pins for encoder buttons
+#define b1Pin 0
+#define b2Pin 2
+#define b3Pin 3
+#define b4Pin 4
+
+// Digital pins for encoder quadrature
+#define e1aPin 5
+#define e2aPin 6
+#define e3aPin 7
+#define e4aPin 8
+
+#define e1bPin 20
+#define e2bPin 21
+#define e3bPin 22
+#define e4bPin 23
+
+// CV pins
+#define cvGatePin 9
+#define cvPitchPin 10
+#define cvBreathPin 11
+#define cvBitePin 12
+
+//Output pins for LEDs
+#define statusLedPin 13
+#define ledStripPin 1
+#define numLeds 8
+
+// Key pins
+// RH keys
+#define K1Pin 0 
+#define K2Pin 1
+#define K3Pin 2
+#define K4Pin 3
+#define K5Pin 4
+#define K6Pin 5
+#define K7Pin 6
+#define K8Pin 7
+
+// LH keys
+#define K9Pin 8
+#define K10Pin 9
+#define K11Pin 10
+#define K12Pin 11
+
+// Octave roller pins
+#define R1Pin 0
+#define R2Pin 1
+#define R3Pin 2
+#define R4Pin 3
+#define R5Pin 4
+#define R6Pin 5
+
+// Additional pins
+#define bitePin 6
+#define pbUpPin 7
+#define pbDnPin 8
+#define vibratoPin 9
+
+#endif