Custom-Selector-Callback.ino

Custom-Selector-Callback

This example demonstrates how to use custom callbacks to display the value of a selector.

Boards:

AVR, AVR USB, Nano 33, Due, Teensy 3.x, ESP8266, ESP32

Connections

• 10: Red pin of an RGB LED (+ series resistor)
• 11: Green pin of an RGB LED (+ series resistor)
• 12: Blue pin of an RGB LED (+ series resistor)
• 2: Push button (to ground, internal pull-up resistor will be used)
• 3: Push button (to ground, internal pull-up resistor will be used)

Connect the common cathode of the RGB LED to ground.

Behavior

The LEDs display the current setting of the bank. Red is the first bank (0), yellow is the second bank (1), green is the third bank (2), cyan is the fourth bank (3), blue is the fifth bank (4), and purple is the sixth bank (5).

Use the two push buttons to change the setting. The one on on pin 2 increments the setting, the one on pin 3 decrements the setting.
Keeping one of the buttons pressed will keep on cycling through the settings until you let go of it.
Pressing both buttons simultaneously resets the setting to its initial value.

Note: this example doesn't send any MIDI, but you could use it as a template for a MIDI controller with banks.

Mapping

None.

Written by PieterP, 2020-02-03
https://github.com/tttapa/Control-Surface

 
#include <Control_Surface.h>
 
// Custom callback to handle output for a selector.
class MySelectorCallback {
  public:
    // Constructor
    MySelectorCallback(pin_t redLED, pin_t greenLED, pin_t blueLED)
      : redLED(redLED), greenLED(greenLED), blueLED(blueLED) {}
 
    // Begin function is called once by Control Surface.
    // Use it to initialize everything.
    void begin() {
      pinMode(redLED, OUTPUT);
      pinMode(greenLED, OUTPUT);
      pinMode(blueLED, OUTPUT);
      show(0);
    }
 
    // Update function is called continuously by Control Surface.
    // Use it to implement things like fading, blinking ...
    void update() {}
 
    // Update function with arguments is called when the setting
    // changes.
    // Use it to update the LEDs.
    void update(setting_t oldSetting, setting_t newSetting) {
      (void) oldSetting; // unused in this example
      show(newSetting);
    }
 
  private:
    // Show the color of the given setting.
    void show(setting_t setting) {
      uint8_t color = getColor(setting);
      digitalWrite(redLED, color & 0b001 ? HIGH : LOW);
      digitalWrite(greenLED, color & 0b010 ? HIGH : LOW);
      digitalWrite(blueLED, color & 0b100 ? HIGH : LOW);
    }
 
    // Convert the given setting to a 3-bit RGB color value.
    static uint8_t getColor(setting_t setting) {
      switch (setting) {
        case 0: return 0b001;
        case 1: return 0b011;
        case 2: return 0b010;
        case 3: return 0b110;
        case 4: return 0b100;
        case 5: return 0b101;
        default: return 0b000;
      }
    }
 
  private:
    // Member variables to remember the pin numbers of the LEDs.
    pin_t redLED, greenLED, blueLED;
};
 
// :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: //
 
USBMIDI_Interface midi;
 
// Create 6 banks with one track per bank.
Bank<6> bank = 1;
 
// Create a selector that uses our custom callback, to control the bank.
GenericIncrementDecrementSelector<6, MySelectorCallback> selector = {
  bank,         // bank to manage
  {10, 11, 12}, // red, green, blue LED pins 
                // (this is the MySelectorCallback constructor defined above)
  {2, 3},       // incr/decr button pins
  Wrap::Wrap,   // wrap around when reaching setting 6
};
 
void setup() {
  Control_Surface.begin(); // initialize
}
 
void loop() {
  Control_Surface.loop(); // update
}