Nano.Slider QMK midi

config.h

/*
Copyright 2020 Duckle

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include "config_common.h"

/* USB Device descriptor parameter */
#define VENDOR_ID 0x03A8
#define PRODUCT_ID 0x0000
#define DEVICE_VER 0x0001
#define MANUFACTURER keebwerk.
#define PRODUCT nano. slider Bentō edition

/* key matrix size */
#define MATRIX_ROWS 2
#define MATRIX_COLS 4

/*
 * Keyboard Matrix Assignments
 */
#define MATRIX_ROW_PINS { F0, F1 }
#define MATRIX_COL_PINS { B0, B1, B2, B3 }
#define UNUSED_PINS

#define SLIDER_PIN D4
#define POT_TOLERANCE 10

/* COL2ROW, ROW2COL*/
#define DIODE_DIRECTION COL2ROW

#define BACKLIGHT_PIN B7
#define BACKLIGHT_BREATHING
#define BACKLIGHT_LEVELS 3

#define RGB_DI_PIN F6
#ifdef RGB_DI_PIN
#    define RGBLED_NUM 4
#    define RGBLIGHT_HUE_STEP 8
#    define RGBLIGHT_SAT_STEP 8
#    define RGBLIGHT_VAL_STEP 8
#    define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
#    define RGBLIGHT_SLEEP         /* If defined, the RGB lighting will be switched off when the host goes to sleep */
                                   /*== all animations enable ==*/
#    define RGBLIGHT_ANIMATIONS
// /*== or choose animations ==*/
//   #define RGBLIGHT_EFFECT_BREATHING
//   #define RGBLIGHT_EFFECT_RAINBOW_MOOD
//   #define RGBLIGHT_EFFECT_RAINBOW_SWIRL
//   #define RGBLIGHT_EFFECT_SNAKE
//   #define RGBLIGHT_EFFECT_KNIGHT
//   #define RGBLIGHT_EFFECT_CHRISTMAS
//   #define RGBLIGHT_EFFECT_STATIC_GRADIENT
//   #define RGBLIGHT_EFFECT_RGB_TEST
//   #define RGBLIGHT_EFFECT_ALTERNATING
// /*== customize breathing effect ==*/
//   /*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/
//   #define RGBLIGHT_BREATHE_TABLE_SIZE 256      // 256(default) or 128 or 64
//   /*==== use exp() and sin() ====*/
//   #define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
//   #define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
#endif

/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
#define DEBOUNCE 5

/* define if matrix has ghost (lacks anti-ghosting diodes) */
//#define MATRIX_HAS_GHOST

/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
#define LOCKING_SUPPORT_ENABLE
/* Locking resynchronize hack */
#define LOCKING_RESYNC_ENABLE

/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
 * This is userful for the Windows task manager shortcut (ctrl+shift+esc).
 */
// #define GRAVE_ESC_CTRL_OVERRIDE

/*
 * Feature disable options
 *  These options are also useful to firmware size reduction.
 */

/* disable debug print */
//#define NO_DEBUG

/* disable print */
//#define NO_PRINT

/* disable action features */
//#define NO_ACTION_LAYER
//#define NO_ACTION_TAPPING
//#define NO_ACTION_ONESHOT

/* disable these deprecated features by default */
#define NO_ACTION_MACRO
#define NO_ACTION_FUNCTION

/* Bootmagic Lite key configuration */
// #define BOOTMAGIC_LITE_ROW 0
// #define BOOTMAGIC_LITE_COLUMN 0

keymap.c

/* Copyright 2020 Duckle
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include QMK_KEYBOARD_H
#include "analog.h"
#include "qmk_midi.h"
int16_t max_pot_val = 1023;
int16_t max_ticks = 50;
int16_t ticks = 0;
int16_t pot_oldVal = 0;
int16_t pot_val    = 0;
#include "print.h"

// uint8_t divisor = 0;

// void slider(void) {
//     if (divisor++) { // only run the slider function 1/256 times it's called
//         return;
//     }

//     midi_send_cc(&midi_device, 2, 0x3E, 0x7F - (analogReadPin(SLIDER_PIN) >> 3));
// }

void matrix_init_user(void) {
    analogReference(ADC_REF_POWER);
    for (int i = 0; i<max_ticks;++i){
        tap_code(KC_VOLD);
    }
    ticks = 0;
}

void matrix_scan_user(void){
    slider();

    pot_val   = (analogReadPin(SLIDER_PIN));
    // If there is a big enough change, then we need to do something
    if (abs(pot_val - pot_oldVal) > POT_TOLERANCE) {
        // uprintf("Pot Val: %d",pot_val);
        int num_ticks = ((float)pot_val/max_pot_val)*max_ticks;
        int delta_ticks = num_ticks - ticks;
        if (delta_ticks < 0) {
            for (int i = 0; i<abs(delta_ticks);++i){
                tap_code(KC_VOLU);
            }
        } else {
            for (int i = 0; i<abs(delta_ticks);++i){
                tap_code(KC_VOLD);
            }
        }
        ticks = num_ticks;
        pot_oldVal = pot_val;
    }
}

// Defines names for use in layer keycodes and the keymap
enum layer_names {
    _BASE,
    _FN,
    _MEDIA
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    /* Base */
    [_BASE] = LAYOUT(
        LT(_FN,KC_ESC),
        KC_F13,KC_F14,KC_F15,
        C(G(KC_LEFT)), A(C(S(KC_W))),  C(G(KC_RGHT)), KC_SPACE
    ),
    [_FN] = LAYOUT(
        KC_TRNS,
        RGB_TOG, RGB_M_P,  RGB_VAI,
        RESET,   RGB_M_G,  RGB_VAD, TG(_MEDIA)
    ),
    [_MEDIA] = LAYOUT(
        TG(_MEDIA),
        KC_F17, KC_F18, KC_F19,
        KC_MPRV, KC_MPLY, KC_MNXT, KC_MUTE
    )
};