Initial commit

variants/versapad/variant.h

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+#pragma once
+
+// VersaPad v2 – SAMD21G18A Custom Variant
+// Arduino pin assignments for the custom PCB
+
+#define ARDUINO_SAMD_VARIANT_COMPLIANCE 10610
+
+#include <WVariant.h>
+
+// ─── Pin count ────────────────────────────────────────────────────────────────
+// D0–D9   : Button matrix (COL_0–4, ROW_0–4)
+// D10–D17 : Rotary encoders A/B (ENC0–ENC3), all on EIC
+// D18–D20 : SPI for WS2812 (SERCOM5: MOSI, SCK, MISO)
+// D21–D22 : USB D–/D+ (internal, not exposed)
+// D23–D25 : Fader ADC inputs (A0–A2)
+// ─────────────────────────────────────────────────────────────────────────────
+#define PINS_COUNT           (26u)
+#define NUM_DIGITAL_PINS     (23u)   // D0–D22 usable as digital
+#define NUM_ANALOG_INPUTS    (3u)    // A0–A2 = D23–D25
+#define NUM_ANALOG_OUTPUTS   (0u)
+
+#define analogInputToDigitalPin(p) ((p < NUM_ANALOG_INPUTS) ? (p) + 23u : -1)
+// digitalPinToInterrupt is defined by Arduino.h as (P).
+// attachInterrupt() then internally looks up ulExtInt via g_APinDescription.
+
+// ─── Button Matrix ────────────────────────────────────────────────────────────
+// Columns (driven LOW one at a time)
+#define PIN_COL0   (4u)   // PB10  – also encoder SW column
+#define PIN_COL1   (3u)   // PA11
+#define PIN_COL2   (2u)   // PA10
+#define PIN_COL3   (1u)   // PA09
+#define PIN_COL4   (0u)   // PA08
+
+// Rows (read with internal pull-up)
+#define PIN_ROW0   (5u)   // PB11
+#define PIN_ROW1   (6u)   // PA12
+#define PIN_ROW2   (7u)   // PA13
+#define PIN_ROW3   (8u)   // PA14
+#define PIN_ROW4   (9u)   // PA15
+
+// ─── Rotary Encoders ──────────────────────────────────────────────────────────
+// All on EIC (External Interrupt Controller) for hardware quadrature
+#define PIN_ENC0_A (16u)  // PA22  EIC EXTINT6
+#define PIN_ENC0_B (17u)  // PA23  EIC EXTINT7
+#define PIN_ENC1_A (14u)  // PA20  EIC EXTINT4
+#define PIN_ENC1_B (15u)  // PA21  EIC EXTINT5
+#define PIN_ENC2_A (12u)  // PA18  EIC EXTINT2
+#define PIN_ENC2_B (13u)  // PA19  EIC EXTINT3
+#define PIN_ENC3_A (10u)  // PA16  EIC EXTINT0
+#define PIN_ENC3_B (11u)  // PA17  EIC EXTINT1
+
+// ─── WS2812 SPI (SERCOM5) ─────────────────────────────────────────────────────
+#define PIN_SPI_MOSI (18u)  // PB22  SERCOM5 PAD2  ← LED data line
+#define PIN_SPI_SCK  (19u)  // PB23  SERCOM5 PAD3
+#define PIN_SPI_MISO (20u)  // PB03  SERCOM5 PAD1  (unused for WS2812)
+
+#define PERIPH_SPI        sercom5
+#define PAD_SPI_TX        SPI_PAD_2_SCK_3   // MOSI=PAD2, SCK=PAD3
+#define PAD_SPI_RX        SERCOM_RX_PAD_1   // MISO=PAD1
+
+// ─── Faders (ADC) ─────────────────────────────────────────────────────────────
+#define PIN_A0     (23u)  // PA02  ADC AIN[0]
+#define PIN_A1     (24u)  // PA03  ADC AIN[1]  (also VREFA)
+#define PIN_A2     (25u)  // PB08  ADC AIN[2]
+
+#define PIN_FADER0 PIN_A0
+#define PIN_FADER1 PIN_A1
+#define PIN_FADER2 PIN_A2
+
+static const uint8_t A0 = PIN_A0;
+static const uint8_t A1 = PIN_A1;
+static const uint8_t A2 = PIN_A2;
+
+// ─── USB (internal) ───────────────────────────────────────────────────────────
+#define PIN_USB_DM   (21u)  // PA24
+#define PIN_USB_DP   (22u)  // PA25
+#define PIN_USB_HOST_ENABLE  (21u)  // unused, required by core
+
+// ─── SPI ──────────────────────────────────────────────────────────────────────
+#define SPI_INTERFACES_COUNT 0  // SPI-Objekt wird in src/hal/spi.cpp definiert
+
+// ─── Serial / UART ────────────────────────────────────────────────────────────
+// No hardware UART exposed; USB CDC is used as Serial
+#define SERIAL_INTERFACES_COUNT 0
+
+// ─── I2C ──────────────────────────────────────────────────────────────────────
+// Not used on this board, stubs required by core
+#define WIRE_INTERFACES_COUNT   0
+#define PIN_WIRE_SDA   (16u)  // PA22 (reused, I2C not enabled)
+#define PIN_WIRE_SCL   (17u)  // PA23
+
+// ─── ADC reference ────────────────────────────────────────────────────────────
+#define ADC_RESOLUTION 12
+
+// ─── Clock ────────────────────────────────────────────────────────────────────
+// Required by cores/arduino/delay.c (micros / delayMicroseconds)
+#define VARIANT_MCK    (48000000ul)
+#define VARIANT_MAINOSC (32768ul)