cs-midi-docs/docs/examples/01-output/22-cc-potentiometer-map.md

CCPotentiometer Map

Analog input with a custom mapping function to eliminate dead zones.

Original: CCPotentiometer-Map.ino

#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include <cs_midi.h>

using namespace cs;

BluetoothMIDI_Interface midi;

CCPotentiometer potentiometer {26, {MIDI_CC::Channel_Volume, Channel_1}};

constexpr analog_t maxRawValue = CCPotentiometer::getMaxRawValue();
constexpr analog_t minimumValue = maxRawValue / 64;
constexpr analog_t maximumValue = maxRawValue - maxRawValue / 64;

analog_t mappingFunction(analog_t raw) {
    if (raw < minimumValue) raw = minimumValue;
    if (raw > maximumValue) raw = maximumValue;
    return (raw - minimumValue) * maxRawValue / (maximumValue - minimumValue);
}

int main() {
    stdio_init_all();
    if (cyw43_arch_init()) return 1;
    potentiometer.map(mappingFunction);
    Control_Surface.begin();
    while (true) {
        Control_Surface.loop();
        sleep_ms(1);
    }
}